专利摘要:

公开号:WO1982000164A1
申请号:PCT/G1981/000120
申请日:1981-07-01
公开日:1982-01-21
发明作者:Licensing Co Ltd Lintrend
申请人:Sloan F;
IPC主号:D06M11-00
专利说明:
[0001] FIBROUS PRODUCT CONTAINING VISCOSE
[0002] The United States Application des ignated in this appl ication is a continuation-in-part o£ United
[0003] States Application Serial No . 237 , 874 tiie entire disclosure o£ whic is completely incorporated herein hy reference .
[0004] It is common practice to impart easy care properties 〔for instance wet and/or dry creas e resistance) , to fabrics formed of cotton fibres, or blends containing cotton fibres with, for instance , polyester fibres .
[0005] S Such methods involve the use of inter alia textile
[0006] res ins or cellulos ic cross-linking agents . In PCT
[0007] Patent Specification W080/i00463' a process is described for imparting easy care properties to linen products , optionally mixed with voscose .
[0008] 0 It would be very desirable to be able to make - a wide "range of easy care products containing viscose but it has not previously "been possible to achieve th s by any convenient commercial methods .
[0009] , ' Although viscose has certain inherent
[0010] S advantages as a fabric fibre it also suffers from
[0011] serious disadvantages . Thus an untreated viscose fabric will not have satisfactory easy care properties , and
[0012] for instance will readily crease . In an attempt at
[0013] improving the easy care properties and in order to
[0014] 0 minimise loss o£ strength, when wet and in order to
[0015] minimise shrinkage it is common to -D ly a textil e
[0016] - resin. However the amount that is appl ied has to
[0017] be such that the resultant fabric los es some of the
[0018] des irab le properties of viscose and instead becomes
[0019] 5 rather harsh , especially when wet , and the easy care
[0020] properties are still not entirely satisfactory .
[0021] Another disadvantage of viscose is that
[0022] it has very poor dye receptivity, probab ly because when the vi scose fibre is contacted with a dye the f ibre swells and so reduces the capillary action that is
[0023] necessary for reception of dye. Accordingly i t is
[0024] not possible to dye viscose fabrics by conventional
[0025] continuous dyeing techniques .
[0026] Viscose is soluble in- alkali and s ince many o£ the conventional treatments for giving easy care
[0027] properties require alkali treatment it would be
[0028] expected that they would result in destruction or damage o£ the fibres .
[0029] It has been alleged, in German Patent Specification 1173428 , that good dry . and wet resistance and soft hand on fabrics of native or regenerated
[0030] cellulose can be obtained by treating the fabrics with a compound that evolves formaldehyde when heated followed by treatment with a solution containing 2 to 61 alkali and a glycol softener. In practice however this method does not give very satisfactory results when applied
[0031] to viscose containing fabrics,
[0032] In British Patent Specification No . 10344S3 a process is described of forming a bulked fabric "by
[0033] cross -linking viscose rayon fibre and then using this
[0034] fibre to form a fabric which is then impregnated with
[0035] caustic soda and then pulled back to full width. . It is also mentioned that the cross-linking can be conducted on the fabric itself, but this is not exemplified and
[0036] in fact it seems probable that t e desired bulk effect would not be . achieved if the cross-linking was conducted on the fabric instead o£ the free fibre .
[0037] The process has not been adopted commercially for the treatment of fabric and, prior to the present
[0038] Invention , there has been no known commercial process
[0039] for making a fabric including substantial amounts of
[0040] viscose xilares and that has an acceptable combination
[0041] of dry and wet crease resistance and softness .
[0042] Although cellulos ic fabrics are cons idered
[0043] by many users to possess properties that make them
[0044] preferable to synthetic fabrics for wear in hot humid
[0045] , CM I conditions a disadvantage of many such fabrics is that they become less soft with increasing moisture .
[0046] Accordingly although they may be very comfortable under moderate conditions of temperature and humidity at
[0047] 5 high humidity the softness of the fabric has been
[0048] reduced, thus making the humidity more noticeable to the wearer.
[0049] It has been our object to devise a method of forming a fabric including viscose fibres and which 10 has a good combination of wet crease resistance and softness and preferably also dry crease resistance.
[0050] In the invention a fabric that includes viscose fibres, generally in an amount of at least 301 by weight of the fibres in the fabric, is impregnated with, an
[0051] S initial cross-linking agent and an activator for this,
[0052] the agent is cured, the fabric is then mercerised while allowing shrinkage o£ viscose fibres, and the viscose fibres in the fabric are allowed to remain permanently shrunk by at least 5%.
[0053] 0 The fabric may be formed solely o£ viscose
[0054] fibres or it may ¾e formed of viscose fibres together with other fibres, generally in an amount o£ no.t more i than 50% by weight. These other fibres may be
[0055] ' synthetic fibres but preferably are natural fibres ,
[0056] S most preferably cotton or linen. Preferred fabrics
[0057] contain from SO to 90¾ viscose and 10 to 40% cotton or lirien. ¾·
[0058] When the fabric is formed of a blend of
[0059] viscose fibres and other fibres the fabric may be formed0 of yarns consisting of viscose and yarns consisting o£
[0060] the other fibres but more usually is formed o£ yarns each comprising a blend of viscose and the other fibres .
[0061] Suitable methods of forming appropriate linen, blends are known and reference may be made to, for instance , PCT
[0062] Publication 080/00463.
[0063] Any material capable of cross-linking the cellulosic molecules of the viscose fibres to the
[0064] desired extent may be used. Formaldehyde donors may be used but preferably the initial cross -linking is
[0065] achieved by impregnation with a conventional eel lulos ic cross-linking agent and an activator .
[0066] This cross-linking agent is a bi- or poly - functional reagent that will react with, and thus bridge and cross-l ink, hydroxy groups in the cellulos e .
[0067] Typical bi- or poly-functional compounds that serve as cross -linking agents are alcohols , triazones , aldehydes such as glyoxal , and methylol urea derivatives that will react with, cellulose in preference to undergoing self polymerisation, such, as dimethylol cyclic
[0068] methylene or ethylene or other alkylene urea.
[0069] Activators suitable for use with such cross- linking agents are well known and are generally referred to as catalysts or curing agents . They generally are
[0070] acidic, for instance inorganic or organic acids such
[0071] as citric or succinic acid or acidic salts such, as
[0072] magnesium chloride . Preferably, ins ead o£ using
[0073] phase separation catalysts such, as these , non-phase
[0074] separation curing agents (for instance a txiethyTene''
[0075] glycol citric acid or other citric acid water soluble
[0076] polyester) are used.
[0077] The cross -linking agent and activator are
[0078] generally applied from an aqueous solution containing , for instance 10 to 30% o£ the cross -linking agent and
[0079] 0. 5 to 5% of the activator. The pick up may be , for
[0080] example , SO to 801 by height of the solution.
[0081] Curing of the cross-linking system may be
[0082] achieved by, for instance, heating at 120 to 220°C for
[0083] 0.5 to 5 minutes .
[0084] Known mercerising reagents and temperatures may be used for the mercerising step in the invention.
[0085] Suitable reagents are strong ammonia, cuprammonium
[0086] solutions and other alkaline solutions generally of
[0087] alkaline earth metal hydroxides , for instance calcium
[0088] hydroxide or alkali metal hydroxides , generally sodium
[0089] hydroxide , the l atter being preferred. Typical
[0090] concentrations of caustic soda or other reagent are 10
[0091] CMPI to 40¾ , especially 20 to 30¾ , by we ight g iving about
[0092] 60°Tw. Treatment preferably compris es impregnat i on e. g. by immers ion in a 3 owl trough mangle at a
[0093] temperature below 30°C , preferab ly 0 to 10°C .
[0094] S Impregnation. o£ caustic soda between 0-10°C is the
[0095] preferred method. This is obtained by refrigerating
[0096] the caustic soda and circulating the l iquor in the
[0097] trough for the impregnating mangle . The contact
[0098] with alkali is generally relatively quick , for instance 10 I to 30 minutes and usually 1 to 10 minutes^ whereupon
[0099] the fibrous material is washed with water to eliminate the allcali or other mercerising reagent.
[0100] It seems that the success of the invention resides partly upon the fact that the initial cross- IS linking provides an appropriate degree of restraint
[0101] ¾ut that the viscose swells and the fibres- - ^r permanently shrink as a result of the mercerisation. Without the cross-linking step , the fibres would dissolve during
[0102] the mercerisatio'n. It seems that the cross-linking
[0103] 20 provides restraint such that unique changes occur. in the
[0104] structure of the fibres during the mercerisation- It can be considered that the fibres pass through a t ermoplastic state. Whatever the precise mechanism,
[0105] T ' it is a fact that appropriate combination of cross-linking 25 followed by mercerisation and permanent shrinlcage results in a surprising improvement in the wet crease resistance of the fibres .
[0106] In order to obtain good resul ts a s ignificant amount of swel ling must occur. However if there is
[0107] 30 insufficient cross-linking the degree o£ swelling will
[0108] be so much that , after drying the fabric , the fibres
[0109] will be very brittle and hard. If the degree o£ cross- lmJ iiig is too much then the f bric becomes very rigid and inadequate swel ling occurs . However higher than ϋ normal degrees of cross-linking can be tol erated if the
[0110] cross-l inking agent is one that is degraded by the
[0111] mercerising conditions , since the mercerisat ion wil l then result init ially in reduction of the degree o£ cross-linking and then in the~-des ired swel l ing and shr inkage .
[0112] The preferred cross-linking agents are
[0113] cyclic alkylene urea derivatives , for instance d ihydroxy dime thy lol cyclic methyl ene or ethylene urea and it is
[0114] S convenient to express the degree o£ cross-linking by
[0115] reference to the add-on o£ such tross-linking agents
[0116] to the fabric. In general the degree of cross - linking should be below 201 add-on s ince satisfactory results are not usually obtainable with higher values ,
[0117] 10 unless the cross - linking agent decompos es partially
[0118] during mercerisation- Generally the CTOS S一 linking should be above 31 add-on , since with lower amounts
[0119] the degree of restraint is so small that very high
[0120] shrinkage will occur. Low add-ons such as 3 or
[0121] 15 Ai are particularly desirable when, the fabric has a
[0122] wide warp spacing since it is then possible to make
[0123] a stretch fabric. For more usual purposes however suitable add-ons are from S to 20 % , especially S to
[0124] .15 1 . Best results are generally obtained with add-ons 20 of from S to 13 % , most preferably about 101 . When a
[0125] different type o£ cross -linlcing agent is used then
[0126] different , but equivalent , amounts o£ add-on will be ::
[0127] required. For instance if the cross-linking agent
[0128] is formaldehyde , either introduced as such or liberated 25 from a formaldehyde donor , then the equivalent amounts
[0129] of add-on will be very much less , due to the lower
[0130] molecular weight of formaldehyde .
[0131] For any particular degree of cross -linking
[0132] there will be a potential shrinkage obtainable by the ■30 fabric during prolonged mercerisation and preferably
[0133] the conditions o£ mercerisation are such, that the weft viscose fibres have a final shrinkage of at . least SOI and preferably at least 75 ¾ o£ their potential shrinkage and the warp fibres have a shrinkage of at l east 251
[0134] i and preferably at l east 33 % of their potential shrinkage .
[0135] For instance the duration of the jnercerisation should be sel ected to be suffici ently long to achieve the des ired degree of shrinkage . With the lower degrees of
[0136] O PI cross-linking 〔for instance equ ival ent to 15 ¾ add-on or less) it is usually suffic ient for mercerisation to be conducted for not more than 10 or IS minutes but
[0137] with higher degrees of cross-linking , for instance I S to 20¾ add-on , longer periods up to 30 minutes or even more may be required. - '
[0138] The mercerisation may be conducted while
[0139] no tens ion is applied in the warp or weft , for ins tance while the fabric is allowed to remain in a relaxed
[0140] state in a trough , and the fabric may then be pulled lengthwise 〔i . e . in the warp direction) to the next
[0141] processing stage 〔 for instance rinsing and drying) ,
[0142] This pulling will result in some warp tens ion and some reduction in the waT shrinkage , which, previously will preferably have been the full shrinkage attainable .
[0143] The weft shrinkage , which also will preferably have been the maximum shrinkage attainable , may be allowed to
[0144] rem in unchanged or may be reduced s lightly as a result o£ stentering the fabric out to a controlled width ,
[0145] which still results in a final shrinkage o£ at least'
[0146] 51 . Another way of achieving the mercerisation
[0147] is to conduct the mercerisation while restricting the fabric against some shrinkage in the warp direction and optionally also in the weft direction , or instance by pulling it on a stenter : -- . The tension by which - it is held must be such as to permit the des ired final
[0148] shrinkage to occur . *·
[0149] Preferably the shrinkage that remains in the weft fibres is at least 10¾ , generally 10 to 25 % and
[0150] most preferably 15 to 20% . The shrinkage that
[0151] remains in the warp may be similar but lower shrinkages can be tolerated and may be up to , for instance , 15 ¾ , usually S to 12 % and most preferably 8 to 10% .
[0152] With most fabric constructions the degree
[0153] of shrinkage can be observed s imply by measuring the
[0154] reduction in the width and l ength of the fabric . However with, very tight weaves the weave its elf may prevent
[0155] reduction in the width, or l ength of the fabric even 01.1PI though the fibres within the fabric will have shrunk .
[0156] Accordingly it should be understood that the percentage shrinkage values that are quoted are normally the
[0157] values obtainable by measuring the width and l ength, of
[0158] 5 th.e fabric but that if this is a very tight weave then
[0159] they are the values that would be obtainable by a more loosely woven fabric t.reated under the same conditions .
[0160] A fabric consisting or containing a large
[0161] proportion of viscose fibres will generally have a wet
[0162] 10 crease angle o£ about 90° ,. and this angle is not
[0163] substantially changed by the cross -linking . However the wet crease angle after the mercerisation and permanent shrinkage in the invention can easily be increased to
[0164] 120° or more , for instance as much as 140° . Accordingly 15 the mercerised and shrunk products of the invention have
[0165] good wet crease resistance.
[0166] The dr crease resistance of the initial
[0167] fabric is generally around 100° and this may increase slightly, for Instance to 110σ Λ by the cross-linking.
[0168] 20 However t e mercerisation will generally result in a- reduction of this , for instance back to a value of about 100 . The loss in dry crease angle is general ly less with phase separation catalysts than with non-phase
[0169] , ' separation curing agents as discussed above.
[0170] 5 The wet and dry crease angles mentioned herein are the angles measured by the Shirley Crease Angle test. Higher values indicate', "better properties .
[0171] Although fabrics obtainable by cross-linking and mercerisation as described above iiave good handle
[0172] 0 and wet crease resistance , and are thus suitable for use
[0173] as , for instance , table cloths or upholstery fabrics , it is desirable to improve their dry crease res istance and it has surpris ingly been found tliat this can be
[0174] achieved without damaging the other properties o£ the
[0175] 5 fabric ¾y applying a textile res in or by further cross- linking the mercerised product. Suitable textile
[0176] resins are l nown for the treatment of cotton and may
[0177] be applied in a s imilar manner to obtain an add-on o£
[0178] OMPI 2 to 10¾ , preferably 3 to 7 % and most preferably a r ound 5 % .
[0179] Preferably however the dry crease res istance is improved by subj ecting the fabric to a final cross - S linking , general ly using about half the amount of cross- linking agent used for the initial cross-linking , so that the solids add-on is preferably about 2 to 10¾ , e . g 3 to 71 most preferably around S%. This reduced add-on may be
[0180] achieved us ng more dilute solutions of the cross - 10 linking agent . The cross-linking materials and process
[0181] may be selected from the process and materials discussed above for use in the initial stage. Typically the final dry- crease angle will be 110 to 140°C. Best results are generally obtained using a non-phase
[0182] 15 separation curing agent , for instance a polyester as
[0183] mentioned above , and this has the particular advantage that it gives a fabric having better abrasion resistance .
[0184] . Fabrics made by the invention have a soft handle and good wet crease resistance , and optionally
[0185] 20 also good dry CTea.se resistance . A particular 、
[0186] advantage o£ the invention is that the fabrics also
[0187] can have a unique property in that the f bric becomes softer with increasing humidity. ' '
[0188] , - Accordingly a separate aspect o£ the invention S resides in a novel fabric that contains viscos e fibres
[0189] and which is characterised in that the fibres have been cross-linked and the fabric becomes softer with Increas ing humidity.
[0190] Another advantage of. the invention is that
[0191] 0 it results in the viscose fibres being much more
[0192] easily dyeable than normal . Thus viscose f brics
[0193] processed in accordance with the invention can be
[0194] subj ected to continuous ' d^ei.ng techniques which normally are suitable for use on , for instance , cotton but not
[0195] 5 viscose . Typically the process of the invention results in it being poss ible to obtain the same depth of shade but us ing only half the amount oi dyestuff ½
[0196] The following are exampl es of the invention .
[0197] C PI Example 1
[0198] A f bric may tie formed of yarn formed of a blend of viscose and 25% linen or cotton fibres . The fabric may be impregnated while held on a stenter with
[0199] 5 201 w/v solution of dihydroxy dimethylol cycl ic
[0200] ethylene urea activated with 2% -w/v triethylene glycol citric acid polyester. The acid value of the polyester may be about 190 and the pH of the impregnating solution should be at least 3. 2. The wet pick up of the fabric
[0201] 10 may be about 701 and the dry add-on a out 10% by weight .
[0202] The fabric may then be dried on the stenteT , heated to a temperature o£ about 170° C for 2 minutes , washed and
[0203] dried.
[0204] The fabric may then be passed into and pulled IS out of a bat of caustic soda solution o£ about 301
[0205] and may be drawn out of the "bath, and partially . pulled
[0206] "back to width, on a stenter while being rinsed with, water. The duration of contact between the caustic soda solution and the viscose fibres may be about 1 to 2 minutes .
[0207] 20 While the fabric is passing through the "bath and before
[0208] it is rinsed with, water (thus terminating the meTceris- ation) the tension applied in the length is sufficient to permit the fibres to shrink, and the length, of the , ' fabric to reduce, by about 10% . During the passage
[0209] 5 through, the bath no tension is applied in the weft
[0210] direction, with the result that the weft fibres shrink, and the weft dimensioi>;.reduces , by about 25 % . During the rinsing weft tension is applied on the stenter to
[0211] an amount such that tlie final shrinkage is about 20¾ ,
[0212] 0 based on the original width of t e fabric.
[0213] The washed fabric may then be dried. It will have very high, wet crease resistance and may be dyed
[0214] "by continuous dyeing techniques and has a soft handle
[0215] that becomes softer with, increasing humid ity.
[0216] 5 Exairole _2
[0217] The process of Example 1 may be repeated us ing magnesium chloride as the activator instead of the
[0218] described polyester . The final washed fabric will be
[0219] • C PI found to have wet crease resistance as good as in Exampl e 1 and dry crease resistance rather better than in Example
[0220] Example 3
[0221] S The process of Example 1 may be repeated but
[0222] using higher concentrations of cross -linking agent, with the result that the add-on is about 151 by weight.
[0223] The mercerisation may then be conducted by impregnating the fabric, after cross-linking, with 301 caustic soda .
[0224] 10 solution at about S°C and then leaving the impregnated
[0225] fabric in a J box for about IS minutes before partially pulling it back to width and rinsing and drying it.
[0226] Exam le 4
[0227] The process o£ Example 1 or Example 2 may be
[0228] IS repeated except that after washing the mercerised fabric
[0229] the fabric may then be impregnated with, a 10% /v
[0230] solution of dihydroxy dimethyl cyclic ethylene urea- activated wit II w/v triethylene glycol citric acid
[0231] polyester. The impregnation may be conducted while
[0232] 0 the mercerised fabric s held on a s tenter and it *
[0233] may ¾e then dried, heated to ab ut 170°C for two minutes washed and dried. The final product will have greatly ;
[0234] improved dry crease resistance, while retaining the
[0235] ' wet crease resistance of Examples 1 or 2. The add-on is 5%. 5 Example 5
[0236] The process of Example 1 or Example 2 may be
[0237] repeated except that a^f-ter washing the mercerised fabric the fabric may be impregnated with a solution of urea
[0238] formaldehyde resin, having a molar ratio urea: formaldehyde0 of 1:4 and ammonium di ydrogen phosphate activator at
[0239] a concentration to give a solids add-on of about S%
[0240] and an acidity to give a- pH on the fabric of about 3.2.
[0241] The resin may then be cured by heating, followed by
[0242] . washing and drying. Again the product has very good
[0243] 5 wet crease and dry crease resistance and softness .
[0244] Tlie fabrics treated and shrunk in th.e nrocess of e invention may be used to make shaped goods , eg clothes by conventional methods , while in their permanent shrunk state .
权利要求:
Claims
1* A process in which, a fabric that includes viscose fibres is impregnated with, an initial cross- linking agent and an activator for this , the agent is cured, the fabric is then mercerised while allowing shrinkage of viscose fibres and the viscose fibres In the fabric are allowed to remain shrunk y at least 5% , the weft fibres preferably being allowed to remain shrunlc by at least 10% . '
2· . ,A process according to claim 1 in whic the shrinkage of the we£t dimension o£ the fabric that - remains in the fabric is from 10 to 30% , preferably IS to 25 % and the shrinkage o£ the warp dimension of the £a¾ric that remains in the fabric is from 5 to 30%3 preferably 7 to 12% .
3. A process according to claim 1 οτ claim 2 in which, the cross - linking agent is a cycl ic alkylene urea cro ss -linking ageiit and the so lids add-on is from 3 to 201 by weight or another cross -linking agent is usea in an amount that gives an equivalent degree of cross -linking .
4. A process according to claim 3 in which, the add-on is S to 13 ! , preferably about 10¾ .
5. A process according to any preceding claim in which mercerisation is conducted using 10 to 40¾ sodium hydroxide solution.
6. A process according to any preceding claim in which, mercerisation is conducted whil e no tens ion is applied in the warp or weft and the fabric is then pulled in the warp direction and optionally stretched in the weft direction to give the desired final shrinkage or mercerisation is conducted while applying low tension in the warp and optionally also in the weft to give the desired final shrinkage.
7. A process according to any preceding claim in which the shrunk fabric is impregnated with a final cross-linking agent or textile resin and activator , and the cross- linking agent or resin is then cured.
8· A process according to claim 7 in which the solids add-on of cross-linking agent or textile resin is from 3 to 7%.
9. A process according to any preceding claim in which, the or each cross-linking - agent is a dihydroxy dimethylol cyclic alkylene urea.
10. A process according to any preceding claim in which the or each, activator is an inorganic acid or salt.
11. A process according *to any o£ claims 1 to 9 in which the or each, activator is a water soluble
polyester formed with citric acid and a glycol.
12. A process according to any preceding claim . in which, the fabric is subsequently subjected to
continuous dyeing.
13. A fabric containing viscose fibres characterised in that the fibres have been cross-linked and
the fabric "becomes sofier with increasing humidity.
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同族专利:
公开号 | 公开日
BR8108671A|1982-05-25|
GR74368B|1984-06-28|
ES8204010A1|1982-04-01|
ES503628D0||
NO820648L|1982-03-02|
EP0044172A1|1982-01-20|
JPS57501189A|1982-07-08|
PT73309A|1981-08-01|
HU184471B|1984-08-28|
PL232026A1|1982-02-01|
PT73309B|1982-10-27|
ES503628A0|1982-04-01|
引用文献:
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WO1995024524A1|1994-03-09|1995-09-14|Courtaulds FibresLimited|Fibre treatment|US1034453A|1906-07-24|1912-08-06|Pope Mfg Company|Flexible connection for shafts and the like.|
NL290478A|1962-03-26||||US4487608A|1981-07-01|1984-12-11|Lintrend Limited|Dyeing of fibrous materials|
DE3726268A1|1987-06-24|1989-01-05|Bayer Ag|Textiles flaechengebilde mit reaktivharz|
SE458955B|1987-10-20|1989-05-22|Abb Stal Ab|Pfbc-kraftanlaeggning|
GB9407496D0|1994-04-15|1994-06-08|Courtaulds Fibres Holdings Ltd|Fibre treatment|
GB9408742D0|1994-05-03|1994-06-22|Courtaulds Fibres Holdings Ltd|Fabric treatment|
GB9410912D0|1994-06-01|1994-07-20|Courtaulds Plc|Fibre treatment|
法律状态:
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优先权:
申请号 | 申请日 | 专利标题
GB8021889||1980-07-03||
GB8021889||1980-07-03||
GB8021888||1980-07-03||
GB8021888||1980-07-03||
US237874810225||1981-02-25||BR8108671A| BR8108671A|1980-07-03|1981-07-01|Produto fibroso que contem viscose|
AU73202/81A| AU7320281A|1980-07-03|1981-07-01|Fibrous product containing viscose|
FI820735A| FI820735L|1980-07-03|1982-03-02|Viskos innehaollande fibroest produkt|
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