Ultraviolet Cured (Meth)Acrylate Pressure-Sensitive Adhesive Composition and Process for Producing Thereof

摘要

(Meth)acrylate pressure-sensitive adhesives, curable adhesive compositions that can be used to prepare the (meth)acrylate pressure-sensitive adhesives, and methods of making the (meth)acrylate pressure-sensitive adhesives are provided. More particularly, the (meth)acrylate pressure-sensitive adhesives contain (a) a meth(acrylate copolymer having a weight average molecular weight greater than 500,000 grams/mole (Daltons) and (b) a (meth)acrylate tackifier that has a weight average molecular weight greater than 20,000 grams/mole (Daltons) but no greater than 200,000 grams/mole (Daltons). The pressure-sensitive adhesives advantageously are prepared by ultraviolet (UV) curing a curable adhesive composition that contains minimal or no organic solvents.

主权项

1. A curable adhesive composition comprising:
(a) a first syrup polymer formed from a first reaction mixture, the first reaction mixture comprising
(1) a non-tertiary alkyl acrylate; and(2) an acid-functionalized ethylenically unsaturated monomer; and wherein the first syrup polymer comprises
(i) 1 to 30 weight percent of a partially polymerized acid-functionalized (meth)acrylate copolymer based on a total weight of monomers in the first reaction mixture, wherein the partially polymerized acid-functionalized (meth)acrylate copolymer has a weight average molecular weight greater than 500,000 grams/mole (Daltons); and(ii) 70 to 99 weight percent of un-reacted monomers based on the total weight of monomers in the first reaction mixture; and (b) a (meth)acrylate tackifier having a weight average molecular weight greater than 20,000 grams/mole (Daltons) but no greater than 200,000 grams/mole (Daltons) and having a glass transition temperature no greater than 20° C.; and (c) an ultraviolet photoinitiator.