Urethane-modified rosin ester and process for preparing the same
AssigneeArizona Chemical Company
InventorsErwin R. Ruckel, Martin Epstein
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Abstract
A urethane-modified ester of rosin and a primary polyhydric alcohol has negligible hydroxyl content and is particularly useful as a polar tackifier in an adhesive composition made with a polar elastomer. The modified ester is prepared by reacting a rosin ester, for example, a rosin-pentaerythritol ester which contains some residual hydroxyl groups with a suitable isocyanate or diisocyanate.
Claims9
A urethane-modified rosin ester of a primary polyhydric alcohol having from about 50% to about 95% of the hydroxyl groups of the alcohol esterified with rosin and the remaining hydroxyl groups of the alcohol modified by reaction with an aromatic or aliphatic isocyanate, with no more than negligible unreacted hydroxyl content.
Dependencies are inferred from the claim text.