Multilayer pressure sensitive adhesive assembly

A method for manufacturing a multilayer pressure sensitive adhesive assembly comprising at least a first pressure sensitive adhesive polymer layer superimposed to a second polymer layer, the method comprising the steps of:

• a) providing a substrate;
• b) providing a first curable liquid precursor of the first pressure sensitive adhesive polymer layer and a second curable liquid precursor of the second polymer layer as superimposed layers onto the substrate;
• c) optionally, providing one or more solid films and applying these adjacent to and essentially simultaneously with the formation of the superimposed layers;
• and
• d) curing the superimposed layers of the multilayer pressure sensitive adhesive assembly thus obtained;
• wherein the first curable liquid precursor of the first pressure sensitive adhesive polymer layer comprises:
• a) 60 parts by weight or greater of a low Tg (meth)acrylate copolymer comprising:
• i. C1-C32 (meth)acrylic acid ester monomer units;
• ii. optionally, acid functional ethylenically unsaturated monomer units;
• iii. optionally, non-acid functional, ethylenically unsaturated polar monomer units;
• iv. optionally, vinyl monomer units;
• and
• v. optionally, multifunctional (meth)acrylate monomer units, and
• b) up to 40 parts by weight of a high Tg (meth)acrylate copolymer having a weight average molecular weight (Mw) of above 20,000 Daltons, and comprising:
• i. high Tg (meth)acrylic acid ester monomer units;
• ii. optionally, acid functional ethylenically unsaturated monomer units;
• iii. optionally, low Tg (meth)acrylic acid ester monomer units;
• iv. optionally, non-acid functional, ethylenically unsaturated polar monomer units;
• v. optionally, vinyl monomer units;
• and
• c) optionally, up to 20 parts by weight of a hydrogenated hydrocarbon tackifier, based on 100 parts by weight of copolymers a) and b).