Patent ID: 6121392
Filing Date: 2000-09-19
Classification: C08F

Abstract:
A method for making a low softening point beta-pinene-based polyterpene resin which consists essentially of reacting a mixture containing beta-pinene monomer and an olefinic monomer selected from the group consisting of diisobutylene, dipentene, 2-methyl-2-butene, p-menthadiene and alpha-pinene in the presence of an organic solvent, an aluminum chloride or titanium chloride Lewis acid catalyst and a co-catalyst selected from the group consisting of water, an alcohol, a tertiary origanohalide and an ester at a temperature and for a time sufficient to produce a beta-pinene-based copolymer containing from about 50 to about 98 wt. % beta-pinene monomer units and having a softening point in the range of from about 85 to about 125.degree. C. and a substantially unimodal molecular weight distribution.