Use of a mixed catalyst system to improve the viscosity stabilit

Details Use of a mixed catalyst system to improve the viscosity stabilit Use of a mixed catalyst system to improve the viscosity stabilit

1990-11-30

1991-09-17

Kight, III, John

Chemistry: natural resins or derivatives; peptides or proteins;

Natural resins or derivatives

Rosin or derivative used as starting material in process, or...

530200, 530215, 524272, C09F 100

Patent

active

050496522

ABSTRACT:
Rosin esters having improved viscosity stability are prepared by heating a mixture of rosin and a polyol in the presence of a catalyst mixture of 0.1% to 0.6% by weight calcium bis(ethyl 3,5-di-t-butyl-4-hydroxybenzyl phosphonate) and 0.02 to 1.0% by weight of a second calcium compound selected from calcium carbonate, calcium oxide and a calcium salt of an aliphatic carboxylic acid, all percentages being based on the weight of rosin.

REFERENCES:
patent: 4659514 (1987-04-01), Beuke
patent: 4725384 (1988-02-01), Du Vernet
patent: 4775497 (1988-10-01), Pastor et al.
patent: 4788009 (1988-11-01), Johnson, Jr.

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