Production of molds using gel compositions with depot action bas

Details Production of molds using gel compositions with depot action bas Production of molds using gel compositions with depot action bas

1983-06-09

1984-08-21

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

With step of making mold or mold shaping, per se

Utilizing surface to be reproduced as an impression pattern

264222, 26433119, 264337, B29C 102

Patent

active

044669364

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.
patent: 4131667 (1978-12-01), Lovell et al.
patent: 4341875 (1982-07-01), Visger et al.
Saunders & Frisch, Polyurethanes: Chemistry & Technology, Part I, p. 262.
R. L. Whistler, Industrial Grime, Academic Press, Inc., New York, 1973, pp. 49-114, 473-494, 619-729.

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