Patent ID: 7674856
Filing Date: 2010-03-09
Classification: C08F,C08L,C09J

Abstract:
1. A process for producing a pressure-sensitive adhesive composition, said process comprising the following steps: (1) making an elastomer composition by mixing in the form of a solution, 33.5 to 95% by weight of an aromatic vinyl-isoprene block copolymer (a) having two or more poly(aromatic vinyl) blocks, 0 to 47.5% by weight of an aromatic vinyl-isoprene diblock copolymer (b), and 5 to 33% by weight of isoprene homopolymer (c) having a weight average molecular weight of 20,000 to 100,000, the total amount of the components (a), (b) and (c) being 100% by weight, wherein the elastomer composition has a content of aromatic vinyl monomer unit of 14 to 50% by weight based on the total amount of the components (a), (b) and (c), (2) separating the elastomer composition from the solvent, (3) drying the elastomer composition, and (4) blending a petroleum resin with the elastomer composition made by steps (1)-(3), wherein the amount of the petroleum resin is 10 to 500 parts by weight based on 100 parts by weight of the elastomer composition.