Thermally polymerized dicyclopentadiene/vinyl aromatic resins
AssigneeHercules Incorporated
InventorsNorman Edward Daughenbaugh, Dane George Goodfellow, Deborah Ann Riedl
Life of this patent
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Abstract
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-α-methylstyrene; 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° to about 150° C. Hydrogenation of this resin produces light colored, thermally stable products that are useful as tackifiers in adhesives.
Claims9
A hydrocarbon resin produced by the process comprising (a) providing a mixture consisting essentially of (1) about 40% to 90% by weight based on total monomers of a cyclic diolefin component comprising at least about 50% by weight dicyclopentadiene, and (2) about 60% to 10% by weight based on total monomers of at least one vinyl aromatic component having the formula
- where R1 is H or a 1-10 carbon linear or branched chain alkyl group at the meta- or para-position and R2 is a 1-10 carbon linear or branched chain alkyl group or a 2-methyl-2-phenylpropyl group, (b) thermally polymerizing the mixture, and (c) recovering a product having a Ring and Ball softening point of about 70° to about 150° 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, wherein the hydrocarbon resin is subsequently hydrogenated in the presence of a catalyst comprising a metal selected from the group consisting of Group VIII, IB, IIB, VIB, and VIIB of the Periodic Table.
Dependencies are inferred from the claim text.