Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1986-02-21
1987-02-17
Cockeram, Herbert S.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
527602, 527604, C09F 700, C09F 104, C09F 900
Patent
active
046438483
ABSTRACT:
Phosphinic acid (also called hypophosphorous acid), when used in very small quantities, is disclosed to act as a catalyst to accelerate the reaction of rosin with an unsaturated dibasic acid to form a modified rosin for subsequent esterification with a polyhydric alcohol. According to the process of the invention, a rosin is reacted with an unsaturated dibasic acid such as maleic anhydride or fumaric acid in the presence of phosphinic acid at a temperature of from about 180.degree. C. to about 220.degree. C. When the modified rosin is subsequently esterified, the rosin ester exhibits improved color, softening point, and viscosity in a specified solution.
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Duncan Don P.
Lake Michael A.
Thomas John H.
Womack Gary B.
Cockeram Herbert S.
McDaniel Terry B.
Schmalz Richard L.
Westvaco Corporation
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