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US 4,111,861 AGranted
Method of molding polyurethanes having mold release properties
AssigneeUnion Carbide Corporation
InventorRobert Everett Godlewski
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Abstract
This invention relates to compositions and methods for forming polyether polyurethanes utilizing internal release additives for the purpose of facilitating mold release in the production of molded objects. The invention discloses four classes of internal release additives: (1) mixtures of aliphatic or aryl carboxylic acid and a polar metal compound; (2) carboxyalkylsiloxanes; (3) aliphatic glyoximes; and (4) aralkyl quaternary ammonium salts.
Claims5
A method for producing a polyurethane elastomer which comprises forming in a mold cavity having metal walls and curing a reaction mixture containing:
- (a) a polyol,
- (b) an organic polyisocyanate in an amount that provides from 0.8 to 1.3 isocyanato groups per active-hydrogen in the reaction mixture,
- (c) a catalytic amount of catalyst for curing of the reaction mixture to produce the elastomer, and
- (d) as a mold release additive, mixtures of a fatty acid wherein the number of carbon atoms ranges from about 8 to about 35 and a compound selected from the group consisting of sodium carbonate, sodium oleate and potassium laurate.
1 more element
Dependencies are inferred from the claim text.