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US 2023/0272245 A1Published application
Adhesive-coated thermally sensitive polymer substrate, process for its manufacture and use thereof
OwnerStefan Mundtinventor
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Abstract
The invention relates to an adhesive-coated polymer substrate comprising (a) a polymer substrate containing or consisting of a thermoplastic polymer with a Vicat A50 softening point according to DIN EN ISO 306 of up to 220° C., and (b) an adhesive composition coated directly on at least one side of the polymer substrate, wherein the adhesive composition (b) is a UV-curable or UV-cured hot melt pressure sensitive adhesive (PSA). The invention relates moreover to a process for the manufacture of the adhesive-coated polymer substrate as well as to the use thereof.
Claims5
1:
- A process for the manufacturing an adhesive-coated polymer substrate comprising the steps:
- (i) providing a polymer substrate containing carbon black pigments and a thermoplastic polymer with a Vicat A50 softening point according to DIN EN ISO 306 of up to 220° C., and optionally, an additive;
- (ii) coating directly a UV-curable hot melt pressure sensitive adhesive on at least one side of the substrate;
- and
- (iii) curing the UV- curable hot melt pressure sensitive adhesive by irradiation with UV light.
2 more elements
2:
- The process according to claim 1, wherein the UV-curable hot melt pressure sensitive adhesive is irradiated and cross-linked with a UV light source such that the temperature at a distance of from 15 to 50 mm next to the surface of the coating of the UV-curable hot melt pressure sensitive adhesive on the substrate does not exceed an upper temperature Tmax of 120° C.
3:
- The process according to claim 2, wherein the polymer substrate is made from soft PVC and the UV-curable hot melt pressure sensitive adhesive is an acrylic copolymer containing 0.1 to 30 weight-% methyl(meth) acrylate monomer.
4:
- The process according to claim 3, wherein the UV-curable hot melt pressure sensitive adhesive further comprises a mixture of alkyl(meth)acrylates which is 70 to 99.9 weight-%, based on the mixture, of C2 to C18 alkyl(meth)acrylates.
5:
- The process according to claim 4, wherein the mixture of alkyl(meth)acrylates is n-butyl acrylate, ethyl acrylate and/or 2-ethylhexyl acrylate.