Patent ID: 6608155
Filing Date: 2003-08-19
Classification: C08F

Abstract:
A process for making a hydrocarbon resin, comprising:polymerizing a feed stream comprising pure monomer selected from the group consisting of styrene, alpha-methyl styrene, beta-methyl styrene, 4-methyl styrene, and vinyl toluene fractions in the presence of a supported Lewis acid metal halide solid acid catalyst wherein the Lewis acid comprises at least one member selected from the group consisting of ZnCl2, AlCl3, AlBr3, BF3, BCl3, FeCl3, SnCl4, TiCl4, ZrCl4, HfCl4, BiCl3, and lanthanide halides, wherein substantially all freely-associated water has been removed from the supported metal halide solid acid catalyst; and producing a hydrocarbon resin having a number average molecular weight (Mn) ranging from 400 to 2000, a weight average molecular weight (Mw) ranging from about 500 to 5000, a Z average molecular weight (Mz) ranging from about 500 to 10,000, and a polydispersity (PD) as measured by Mw/Mn between 1.2 and 3.5, where Mn, Mw, and Mz are determined by size exclusion chromatography (SEC).