• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a wax formulation comprising a mixture of saturated and unsaturated triglycerides in which at least 50% m / m of triglycerides are present. Characteristic of the wax formulation according to this invention is that no fat flour is formed on its surface and that no malodor is produced when the wax is processed at higher operating temperatures. The invention also describes a formulation for a paper coating with this wax formulation, a substrate that is treated with this wax or paper coating formulation and the use of this wax or paper coating formulation to coat cardboard, paper or plastic.
    公开号:BE1025713B1
    申请号:E2018/5718
    申请日:2018-10-18
    公开日:2019-06-18
    发明作者:Dirk Stanssens；Eric Jönsson；Yannick Vercammen
    申请人:Topchim Nv；
    IPC主号:
    专利说明:

    WASH FORMULATION WITHOUT FAT FLOWER
    DOMAIN OF THE INVENTION
    The invention relates to a wax formulation comprising a mixture of saturated and unsaturated triglycerides in which at least 50% m / m of triglycerides are present. Characteristic of the wax formulation according to this invention is that no fatty flour is formed on its surface and that no bad odor is produced when the wax is processed at higher operating temperatures. The invention also describes a formulation for a paper coating with this wax formulation, a substrate that is treated with this wax or paper coating formulation and the use of this wax or paper coating formulation to coat cardboard, paper or plastic.
    BACKGROUND OF THE INVENTION
    Protective coatings are widely used to improve the water resistance, structural strength and chemical inertia of paper or cardboard products, for example for use as food packaging. The production costs for paper or cardboard are relatively low and the production technologies are well developed, making these substrates extremely cost-efficient.
    However, these materials are usually not particularly strong when compressed or become very weak when wet because of their low natural water resistance. Coating these substrates therefore appeared to limit or solve these problems. Various oil-based or fat-based coatings are currently known. The formulations of these coatings usually contain no (or only negligible amounts of) water and are generally very resistant to moisture. In particular, the use of coatings containing mainly triglycerides has gained interest due to their much more favorable ecological footprint. Triglycerides are also generally considered safe for use in food or for food contact products.
    A major disadvantage of a coating with triglycerides is the formation of succulent flour on the surface of the coating. Fat flower, a phenomenon well known in the chocolate industry, also occurs with fat-based coatings, for example triglyceride-containing coatings, and is caused by the uncontrolled recrystallization of triglycerides in an undesired crystal form on the surface of the coating. The fat crystals become larger over time, so that they produce a matt appearance and the surface loses its high gloss. As the crystals increase in size, a light-colored deposit is also formed. The general taste and texture of the product may not be seriously changed by the early stages of fat flower, yet the dull color and the white deposit make the product look old, musty and unpalatable to the customer.
    -2BE2018 / 5718
    The formation of fat flower is a typical phenomenon that occurs with wax and oil coatings that contain triglycerides and is mainly due to the polymorphic behavior of triglycerides. "Polymorphism means that there can be multiple crystal forms of the material (side by side). In general, with rapid cooling, less stable crystals are initially formed which have a lower melting point and a lower molecular density, but over time and with temperature fluctuations the molecules can be rearranged by their mobility into more stable crystal forms that have a higher melting point and a higher molecular density. This rearrangement can cause problems: cracks and fatty flowers.
    In the triglyceride-containing paper coatings that are currently available, succulent flour is a major problem since the coating is applied at high temperatures and the surface then cools. The increased crystallization of the triglycerides that takes place with succulent flour can be prevented, among other things, by adding a polymer to the coating. However, this increases the viscosity of the coating, causing more material to be lost due to the adhesion of the coating during the coating process.
    SUMMARY OF THE INVENTION
    This invention is directed to a wax formulation containing triglycerides, in particular a mixture of saturated and unsaturated triglycerides. Characteristic of this invention is that the wax formulation in question does not form a fat flower when applied to a surface such as paper or cardboard.
    The wax formulation of this invention comprises at least 50% w / w triglycerides, also known as triacylglycerides or triacylglycerol, wherein the triglycerides in question are a mixture of saturated triglycerides and unsaturated triglycerides, and wherein the ratio between the saturated and unsaturated triglycerides is between 60: 40 and 90:10.
    The wax formulation of this invention is further characterized by an iodine value between about 5 and about 20, a melting point between 40 ° C and 80 ° C and a viscosity between 5 and 25 centipoise (cP).
    In yet another embodiment, the wax formulation of this invention is a wax formulation in which a total amount of polyunsaturated acyl groups is present in the unsaturated triglycerides of less than 2% m / m of the unsaturated triglycerides; preferably a total amount of less than 1% m / m of the unsaturated triglycerides.
    As already outlined above, the wax formulation of this invention comprises a mixture of saturated and unsaturated triglycerides. These triglycerides are recovered
    -3BE2018 / 5718 from natural oils selected from the group comprising rapeseed oil, rapeseed oil, coconut oil, corn oil, cottonseed oil, olive oil, palm oil, peanut oil, safflower oil, sesame oil, soybean oil, sunflower oil, linseed oil, palm kernel oil, tung oil, jatropha oil, mustard oil, camel oil, mustard oil oil from the seeds of white krodde, hemp oil, algae oil, castor oil or a combination thereof.
    In a still further embodiment, the wax formulation of this invention also contains a thickener. Of this thickener, in particular an amount between 0.5 and 10.0% w / w of the total wax formulation is present.
    The wax formulation of this invention further comprises one or more additives. These additives are selected from the group consisting of fillers, dispersants, adhesives, flexibilizers, fragrances, antioxidants or lubricants, and to which said additives can be added individually or in combinations.
    Fillers can be selected from the group consisting of calcium carbonate, kaolin, talc, silica, smoked silica, glass beads, gypsum. The dispersion of the fillers can be facilitated by the use of dispersants. These can be selected from the group comprising lecithin or acrylic homopolymer.
    Adhesives may be selected from the group consisting of gum resin, wood resin, tall oil resin, rosin glycerol ester, rosin pentaerythritol ester, polyalcohols natural resin esters, polyterpenes, dimerized rosin, hydrogenated rosin, modified rosin, dimeric C5 fatty acids, trimeric acids , dicyclopentadiene resin, polyisobutylene, polybutene.
    Flexibilizers can be selected from the group comprising epoxidized soybean oil, beeswax, paraffin wax, Fischer-Tropsch wax, microcrystalline wax, polyethylene wax, monoacylglycerides, diacylglycerides, acetylated monoacylglycerides, acetylated diacylglycerides, fatty acids.
    Fragrance agents can be selected from the group comprising rosemary extract, vanillin, cinnamon, cinnamaldehyde, maltol.
    Antioxidants can be selected from the group including butyl hydroxy toluene, tocopherols, ascorbyl palmitate, tert-butyl hydroquinone, propyl gallate, sucrose acetate isobutyrate, rosemary extract.
    Lubricants can be selected from the group comprising polysiloxane,
    -4BE2018 / 5718 polydimethylsiloxane, silicone-polyether copolymer.
    Characteristic of this invention is that no fatty flour is formed on the surface of the wax formulation. The wax formulation according to the present invention is further characterized in that it is applied to paper or cardboard at working temperatures higher than 140 ° C without creating a bad odor due to oxidation reactions.
    This invention is also directed to a paper coating formulation comprising a wax formulation according to any of the embodiments outlined above.
    Further, in another aspect, a substrate is disclosed which is treated with a wax formulation of this invention or that is treated with a paper coating formulation of this invention.
    In yet another embodiment of this invention, the use of a wax formulation according to the invention or the use of a formulation for a paper coating according to the invention to coat a substrate is also disclosed. In a still further embodiment, this substrate is selected from the group comprising cardboard, paper or plastic.
    DETAILED DESCRIPTION OF THE INVENTION
    It is thus an object of this invention to provide a wax formulation with triglycerides, also referred to as triacylglycerol or triacylglycerides, which, however, does not form a fat flower when applied at elevated temperatures on a substrate such as, for example, paper or cardboard.
    Because of their water-repellent properties, fat-based wax formulations with triglycerides are often used in a variety of applications, for example to coat cellulosic fiber products such as paper or cardboard. However, one of the disadvantages of these fat-based coatings is the formation of fat flour on its surface. Moreover, because these coatings are often applied to the surface at high temperatures, oxidation often occurs, causing a bad odor.
    That is why there is a need for a thermally stable wax formulation with a relatively high melting point, a low viscosity and good moisture-resistant properties.
    With this invention we provide a new wax coating with a mixture of saturated and unsaturated triglycerides that produces no fatty flour or bad odor. In particular, this invention discloses a wax formulation comprising at least 50% m / m of triglycerides, wherein the triglycerides in question are a mixture of saturated triglycerides and unsaturated triglycerides, and wherein the ratio between saturated and unsaturated triglycerides is between 60:40 and 90:10. Furthermore, the wax formulation is characterized by a
    -5BE2018 / 5718 iodine number between about 5 and about 20. The iodine number, also referred to as the iodine addition number, is a measure of the degree of saturation or unsaturation of a compound. The iodine number measures the amount of iodine that is taken up by a compound within a certain time span, in this case by the total amount of triglycerides in the composition of the coating. When used for an unsaturated material, the iodine value measures the unsaturation or the number of double bonds of this unsaturated material. In the context of this invention, the iodine value is between approximately 5 and approximately 20.
    Iodine numbers are often used to determine the degree of saturation and unsaturation in fatty acids. This unsaturation is caused by the presence of double C-C bonds, which react with iodine compounds. The higher the iodine value, the more double C-C bonds are present in the fatty acid and the more unsaturated the fatty acids are.
    With this wax formulation, the presence of unsaturated triglycerides lowers the total degree of saturation of the formulation. Consequently, it is believed that the combination of the reduced saturation, with an iodine value between about 5 and about 20, and the melting point between 40 ° C and 80 ° C of the wax formulation according to this invention contribute to the characteristics whereby this coating does not form a fat flower . In particular, the reduced saturation of the wax results from the increased presence of double bonds in the wax formulation and affects the crystallization process when applying the coating to the substrate, so that it prevents fatty flour in the coating.
    The wax formulation of this invention is also characterized by a viscosity between 5 and 25 centipoise (cP), a measure by which the viscosity is measured at 100 rpm and 100 ° C.
    Another characteristic of the wax formulation of this invention is the fact that it does not produce a bad odor through oxidation reactions. Because wax coatings are usually applied at high operating temperatures, bad odors regularly arise. At higher temperatures, the presence of unsaturated triglycerides leads to oxidation, producing a bad odor. However, this should be avoided, in particular when the coated substrates are used in food applications. The wax formulation of this invention does not produce a bad odor due to oxidation reactions, even when the wax formulation is applied to the substrate at operating temperatures above 140 ° C.
    The invention also relates to a formulation for a paper coating comprising a wax formulation according to the various embodiments of this invention.
    Furthermore, a substrate is disclosed in this invention that is treated with a wax formulation according to the various embodiments of this invention. Usual
    -6BE2018 / 5718 surfaces are paper, cardboard, plastic, wood, thermoplastic and thermosetting materials, glass, textile, leather and metals. The substrate is preferably paper, cardboard or plastic.
    This invention also discloses the use of a wax formulation according to the various embodiments of the invention or of a paper coating formulation to coat a substrate; in particular, a substrate selected from the group consisting of paper, cardboard, plastic, wood, thermoplastic and thermosetting materials, glass, textile, leather and metals; preferably a substrate that is selected from paper, cardboard or plastic.
    The wax formulation or coating formulation can be applied to a support layer, i.e. a substrate, e.g. typical coating techniques such as dipping, printing, rolling and painting. For paper and cardboard applications, the coatings are usually applied with a wax applicator and a rolling system that includes, for example, feed rollers. For example, after the substrate has been dipped into the wax formulation or paper coating of this invention, the substrate passes between two rollers. The substrate can also be picked up by a feed roll that has incorporated the wax formulation or paper coating of this invention.
    The amount of coating applied to the substrate will depend on the type of support layer, i.e. the substrate to be coated. A larger amount of coating will be required for porous materials. For paper and cardboard a layer of 2 to 25 grams of coating per square meter could usually be used, but preferably a layer of 3 to 14 grams per square meter is applied. A thinner layer offers the advantage that it will reduce the weight of the packaging material and the costs. Moreover, with a thicker layer, the risk of fat flower is greater.
    If paper or cardboard is used as a substrate, it has been found that the coated material of this invention is biodegradable and compostable under the same conditions as non-coated paper and cardboard. This has a major impact on the environmental friendliness of the packaging material.
    权利要求:
    Claims (10)
    [1]
    CONCLUSIONS
    A wax formulation comprising at least 50% m / m of triglycerides in which these triglycerides are a mixture of saturated and unsaturated triglycerides, in which the ratio between the saturated and unsaturated triglycerides is between 60:40 and 90:10, and which is characterized by an iodine value between 5 and 20, by a melting point between 40 ° C and 80 ° C and by a viscosity between 5 and 25 centipoise (cP).
    [2]
    The wax formulation of claim 1 wherein a total amount of polyunsaturated acyl groups is present in the unsaturated triglycerides of less than 2% m / m of the unsaturated triglycerides; preferably a total amount of less than 1% m / m of the unsaturated triglycerides.
    [3]
    The wax formulation of claim 1 or 2 wherein said saturated and unsaturated triglycerides are extracted from natural oils selected from the group comprising rapeseed oil, rapeseed oil, coconut oil, corn oil, cottonseed oil, olive oil, palm oil, peanut oil, safflower oil, sesame oil, soybean oil, sunflower oil , linseed oil, palm kernel oil, tung oil, jatropha oil, mustard oil, camelina oil, oil from the seeds of white shred, hemp oil, algae oil, castor oil or a combination thereof; preferably selected from the group comprising palm oil, rapeseed oil, sunflower oil, soybean oil or a combination thereof.
    [4]
    The wax formulation of any one of the preceding claims, further comprising a thickener; in particular a thickener present in an amount of 0.5 - 10.0% m / m.
    [5]
    The wax formulation according to any of the preceding claims, wherein no fatty flour is formed on the surface of the wax formulation.
    [6]
    The wax formulation as claimed in any one of the preceding claims wherein the wax formulation is applied to paper or cardboard at operating temperatures higher than 140 ° C without creating a bad odor due to oxidation reactions.
    [7]
    A formulation for a paper coating that is a wax formulation as claimed in any one of the claims
    1 to 6.
    [8]
    A substrate that is treated with a wax formulation as claimed in any one of the claims
    1 to 6 or with a paper coating formulation according to claim 7.
    [9]
    The substrate of claim 8, wherein the substrate is selected from the group consisting of cardboard, paper, plastic.
    -8BE2018 / 5718
    [10]
    The use of a wax formulation according to any one of claims 1 through. 6 or a formulation for a paper coating according to claim 7 for the coating of a substrate; especially for a coating of cardboard, paper or plastic.
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    同族专利:
    公开号 | 公开日
    BE1025713A1|2019-06-12|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2019-07-03| FG| Patent granted|Effective date: 20190618 |
    优先权:
    申请号 | 申请日 | 专利标题
    EP17197231|2017-10-19|
    EP17197231.8|2017-10-19|
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