Gel compositions with depot action based on a polyurethane matri

Details Gel compositions with depot action based on a polyurethane matri Gel compositions with depot action based on a polyurethane matri

1982-01-22

1983-09-13

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

523109, 523122, 523123, 523130, 524308, 524311, 524314, 524377, 524732, 524762, 524773, C08L 7508

Patent

active

044042965

ABSTRACT:
A polyol gel is made from 15-62 wt. % (based on the sum of polyurethane matrix plus dispersing agent) of a high molecular weight covalently cross-linked polyurethane matrix; 85-38 wt. % (based on the sum of polyurethane matrix plus dispersing agent) of a liquid dispersing agent which is firmly bonded to the matrix; and optionally, active ingredients, fillers, additives, catalysts, and mixtures thereof. The liquid dispersing agent is a polyhydroxyl compound having a molecular weight of between 1,000 and 12,000 and an OH number between 20 and 112. This dispersing agent should have virtually no hydroxyl compounds having a molecular weight below 800 present. These gel compositions may be used to make mold impressions and highly stable active-ingredient releasing compositions.

REFERENCES:
patent: 3360495 (1967-12-01), Muller et al.
patent: 3822238 (1974-07-01), Blair et al.
patent: 3975350 (1976-08-01), Hudgin et al.
Saunders and Frisch, Polyurethanes: Chemistry & Technology, Part I, pp. 262-263.
R. L. Whistler, Industrial Grime, Academic Press, Inc., New York, 1973, pp. 49-114, 473-494, 619-729.

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