| 摘要 |
A hydrocarbon resin is prepared by (1) thermally polymerizing a mixture consisting essentially of (a) about 40% to 90% by weight based on total monomers of a cyclic diolefin component comprising at least about 50% by weight dicyclopentadiene, and (b) about 60% to 10% by weight based on total monomers of a specified vinyl aromatic component, preferably alpha-methylstyrene; para-methyl-.alpha.-methyl- styrene; 2,4-diphenyl-4-methyl-1-pentene, or mixtures thereof, and (2) recovering a product having a Ring and Ball softening point of about 70.degree. to about 150.degree.C, having a Mz with a maximum value of about 4000, having a Mw with a maximum value of about 2500, and having a Pd with a maximum value of about 3.0. Hydrogenation of this resin produces light colored, thermally stable products that are useful as tackifiers in adhesives.
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