Packaging foil and process for producing same
阅读：111发布：2024-01-28
专利汇可以提供Packaging foil and process for producing same专利检索，专利查询，专利分析的服务。并且Packaging foil comprising a flexible support foil, a top layer of a vinyl polymer, and an adhesion promoter or primer between the support foil and top layer, wherein the primer is a mixture of a chlorine or fluorine containing polymer, an organic compound of at least two isocyanate groups, and a reaction product having terminal hydroxyl groups and derived from a linear polyester with terminal hydroxyl groups and an organic diisocyanate.，下面是Packaging foil and process for producing same专利的具体信息内容。
2. A packaging foil as claimed in claim 1 wherein component (c) has a molecular weight of from 50,000 to 150,000.
3. A packaging foil as claimed in claim 1 wherein the quantity of component (c) is from 20 to 50 parts by weight, to from 80 to 50 parts by weight of component (a).
4. A packaging foil as claimed in claim 1 wherein the -N =C =O content of the primer mixture is at least 0.5 percent by weight, based on total solids content (a)+(b)+(c).
5. A packaging foil as claimed in claim 4 wherein the -N =C =O content is from 1 to 5 percent by weight.
6. A packaging foil as claimed in claim 5 wherein the -N =C =O content is from 2 to 3 percent by weight.
7. A packaging foil as claimed in claim 1 wherein the linear polyester is derived from an aliphatic dicarboxylic acid with up to 10 carbon atoms.
8. A packaging foil as claimed in claim 1 wherein the linear polyester is derived from an aliphatic diol with from two to six carbon atoms.
9. A packaging foil as claimed in claim 1 wherein the diisocyanate is selected from the group consisting of hexamethylene-1, 6-diisocyanate; tolylene-2, 4-diisocyanate; naphthalene-1, 5-diisocyanate; and diphenyl-methane-4,4''-diisocyanate.
10. The packaging foil as defined by claim 1, wherein the vinyl polymer of the top layer is a polymer selected from the group consisting of polyvinylidene chloride and polyvinyl chloride.
11. The packaging foil as defined by claim 1, wherein the top layer is comprised of a copolymer of a compound of the formula: wherein X represents chlorine or fluorine and A represents hydrogen or X, and a comonomer copolymerizable therewith.
12. The packaging foil as defined by claim 1, wherein the polymer of component (a) is selected from the group consisting of polyvinylidene chloride and polyvinyl chloride.
13. The packaging foil as defined by claim 1, wherein the polymer of component (a) is a copolymer of a compound of the formula: wherein X represents chlOrine or fluorine and A represents hydrogen or X, and a comonomer copolymerizable therewith.
14. The packaging foil as defined by claim 13, wherein the copolymer is comprised of from between 1 and 50 percent by weight of the copolymerizable comonomer.
15. The packaging foil as defined by claim 14, wherein the copolymerizable comonomer is an acrylate, a methacrylate, acrylonitrile, methacrylonitrile, styrene, a maleate, allyl crotonate, a vinyl ester, butadiene, vinyl chloride, an epoxide or mixtures thereof.
16. The packaging foil as defined by claim 1, wherein the flexible support member is polypropylene, polyethylene, a polyester, a polyamide, polyvinyl chloride, paper, metal or cellulose hydrate.
17. The packaging foil as defined by claim 1, wherein the vinyl polymer of the top layer and adhesion promoter is polyvinylidene chloride.
18. A process for the production of a packaging foil which comprises applying a solution or dispersion of a primer to a flexible support member, evaporating the solvent or dispersion medium of the primer, applying a solution or dispersion of a vinyl or vinylidene polymer thereto as top layer and evaporating the solvent or dispersion medium of this top layer, wherein the primer is a mixture of a. a polymer of a compound of the general formula in which X represents chlorine or fluorine and A represents hydrogen or has the same meaning as X, b. an organic compound with at least 2 isocyanate, -N =C =O, groups, the -N =C =O content, based on solids content (a)+(b), being at least 0.1 percent by weight, which mixture additionally contains c. a reaction product having terminal hydroxyl groups and derived from a linear polyester with terminal hydroxyl groups and an organic diisocyanate, component (c) being present in such a quantity that there are no more than 60 parts by weight of component (c) to 40 parts by weight of component (a).
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