Patent ID: 11958992
Assignee: BASF SE
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  Y | IPC C

Claim 0:
1. A UV-curable hotmelt adhesive, comprising:
(a) a UV-crosslinkable poly(meth)acrylate formed from
(i) 25% to 60% by weight of methyl acrylate,
(ii) 35% to 60% by weight of an alkyl (meth)acrylate comprising 4 to 8 carbon atoms in the alkyl group,
(iii) 1% to 10% by weight of an ethylenically unsaturated monomer comprising an acid group,
(iv) 0.2% to 5% by weight of an ethylenically unsaturated copolymerizable photoinitiator monomer and
(v) 0% to 25% by weight of a further monomer distinct from (i) to (iv) and

(b) an aliphatic polyester polymer which at 20° C. has a dynamic viscosity of 500 to 20,000 mPa s in an amount of 1% to 20% by weight, wherein the aliphatic polyester polymer is formed from an aliphatic dicarboxylic acid comprising 3 to 10 carbon atoms and an alkanediol comprising 2 to 10 carbon atoms, and
wherein a plasticized polyvinyl chloride (PVC) film coated with the UV-curable hotmelt adhesive exhibits a 180 degree peel strength of >10 N/25 mm after storage for 3 days at 70° C. and 50% relative humidity;
and wherein the plasticized polyvinyl chloride (PVC) film coated with the UV-curable hotmelt adhesive exhibits a shear strength value of >15 h after storage for 3 days at 70° C. and 50% relative humidity.