Thermally polymerized copolymers made from styrene and dicyclopentadiene monomers
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United States of America Patent
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Nov 30, 2004
Grant Date -
Aug 8, 2002
app pub date -
Dec 11, 2000
filing date -
Dec 11, 2000
priority date (Note) -
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Abstract
A hydrocarbon resin is prepared by (1) thermally polymerizing a mixture consisting essentially of (a) about 5% to 25% by weight styrene or aliphatic or aromatic substituted styrene, and (b) about 95% to 75% by weight based on total monomer content of a cyclic diolefin component comprising at least about 50% by weight dicyclopentadiene. A method of producing an aromatic-modified resin having a Mz of less than 2000 through the addition of about 5% to 25% by weight styrene in combination with about 95% to about 75% DCPD monomer at a rate to consume styrene monomer at a the rate at which it is added. Hydrogenation of this resin produces light colored, thermally stable products that are useful as tackifiers in adhesives.
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