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US 2020/0270487 A1Published application
Protective films made of polyolefin support material, primer and radiation-crosslinkable hot melt adhesive
AssigneeBASF SE
InventorsDirk WULFF, Holger KERN, Matthias GERST, Christoph KIENER
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Abstract
Described herein is a protection film comprising a polyolefin carrier material, a precoating of the polyolefin carrier material with a primer selected from polyurethane dispersions and a pressure-sensitive adhesive layer of a radiation-crosslinked hotmelt adhesive. A process for producing such protection films is also described.
Claims20
A protection film comprising:
- (a) a polyolefin carrier material whose surface to be coated has been pretreated,
- (b) a precoating of the polyolefin carrier material with at least one primer selected from aqueous polyurethane dispersions;
- and
- (c) a pressure-sensitive adhesive layer, wherein the pressure-sensitive adhesive layer is formed by radiation crosslinking of a radiation-crosslinkable hotmelt adhesive and wherein the radiation-crosslinkable hotmelt adhesive comprises at least one poly(meth)acrylate formed from
- (i) at least 50% by weight of C1- to C18-alkyl (meth)acrylates and
- (ii) at least one ethylenically unsaturated monomer which comprises at least one polar group, wherein the polar group is selected from the group consisting of carboxylic acid groups, carboxylic anhydride groups, hydroxyl groups, amide groups, urethane groups, urea groups, piperidinyl groups, piperazinyl groups, morpholinyl groups, imidazoyl groups, ureido groups, pyrrolidone groups and combinations of two or more of the recited groups;
- and wherein the radiation-crosslinkable hotmelt adhesive comprises at least one photoinitiator and the photoinitiator is in the form of an additive not bonded to the poly(meth)acrylate and/or the photoinitiator is incorporated into the poly(meth)acrylate by polymerization.
4 more elements
A process for producing protection films, comprising:
- (1) precoating a polyolefin carrier material whose surface to be coated has been pretreated, with at least one primer, wherein the primer is selected from polyurethane dispersions;
- and
- (2) applying a pressure-sensitive adhesive layer is applied to the primer layer, wherein the pressure-sensitive adhesive layer is formed by radiation crosslinking of a radiation-crosslinkable hotmelt adhesive and wherein the radiation-crosslinkable hotmelt adhesive comprises at least one poly(meth)acrylate formed from
- (i) at least 50% by weight of C1- to C18-alkyl (meth)acrylates and
- (ii) at least one ethylenically unsaturated monomer which comprises at least one polar group, wherein the polar group is selected from the group consisting of carboxylic acid groups, carboxylic anhydride groups, hydroxyl groups, amide groups, urethane groups, urea groups, piperidinyl groups, piperazinyl groups, morpholinyl groups, imidazoyl groups, ureido groups, pyrrolidone groups and combinations of two or more of the recited groups;
- and wherein the radiation-crosslinkable hotmelt adhesive comprises at least one photoinitiator and the photoinitiator is in the form of an additive not bonded to the poly(meth)acrylate and/or the photoinitiator is incorporated into the poly(meth)acrylate by polymerization.
3 more elements
Dependencies are inferred from the claim text.