Patent ID: 6605680
Filing Date: 2003-08-12
Classification: C08F,C08L

Abstract:
A process for making a hydrocarbon copolymer resin having a Gardner color of less than about 4 and having a ring and ball softening point from about 85 to about 100Â° C. comprising:(a) providing a first predominantly C5 hydrocarbon component comprising unsaturated aliphatic monomers, said unsaturated aliphatic monomers comprising a combination of piperylene monomers, less than about 2% weight cyclopentadiene and dicyclopentadiene monomers and less than about 1% weight isoprene; (b) providing a second hydrocarbon component comprising a monovinyl aromatic C8 to C12 monomer; (c) combining said components to obtain a weight ratio of said unsaturated aliphatic monomers to said monovinyl aromatic C8 to C12 monomers from about 1.5/1 to about 25/1; (d) polymerizing said combined components at a temperature from about 25 to about 75Â° C.; and (e) recovering said copolymer resin, wherein said copolymer resin has a Mz from about 2500 to about 4000 daltons and a polydispersity of about 1.7 to 2.0.