Patent ID: 11884846
Assignee: BASF SE
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 14:
15. The pressure-sensitive adhesive composition according to claim 1, wherein the pressure-sensitive adhesive polymer is formed from
(i) at least 65% by weight, based on the sum of the monomers, of at least one acrylic acid ester monomer selected from n-butyl acrylate and 2-ethylhexyl acrylate,
(ii) 0.5% to 8% by weight, based on the sum of the monomers, of at least one acid monomer selected from the group consisting of acrylic acid, methacrylic acid and itaconic acid,
(iii) 5% to 19% by weight, based on the sum of the monomers, of styrene,
(iv) 0.3% to 5% by weight, based on the total amount of the monomers, of at least one ethylenically unsaturated compound having at least one keto group selected from the group consisting of acetoacetyl (meth)acrylate, acetoacetoxyethyl (meth)acrylate and diacetone acrylamide, and
(v) 0% to 10% by weight, based on the sum of the monomers, of monomers distinct from the monomers (i) to (iv) selected from the group consisting of a C1 to C20 alkyl (meth)acrylate, a monomer comprising at least one hydroxyl group, a vinyl ester of a carboxylic acid comprising up to 20 carbon atoms, a vinylaromatic having up to 20 carbon atoms, an ethylenically unsaturated nitrile, a vinyl halide, a vinyl ether of an alcohol comprising 1 to 10 carbon atoms, and an aliphatic hydrocarbon having 2 to 8 carbon atoms and one or two double bonds,
wherein the gel content k of the pressure-sensitive adhesive polymer is at least 50% by weight, and
the gel content gel0 of the pressure-sensitive adhesive polymer is more than 0% and up to 30% by weight, and
wherein the glass transition temperature of the pressure-sensitive adhesive polymer is below −15° C.