Polyurethane molding process with siloxane internal release...

Details Polyurethane molding process with siloxane internal release... Polyurethane molding process with siloxane internal release...

B - Operations, Transporting

29

C

18/715

B29C 33/64 (2006.01) C08L 75/08 (2006.01)

Patent

CA 1176420

P-585 TITLE Polyurethane molding process with siloxane internal release agent. ABSTRACT An improved polyurethane RIM process using a polycarboxy-functional alkyl siloxane as an internal release agent characterized by: (1) Tool break-in or preconditioning with siloxane treatment of the surfaces; (2) Supplying the siloxane to the mix head as a third stream when necessary to prevent undesired side reactions; (3) using a minimal amount of siloxane that is inadequate for mold release in the absence of the tool preconditioning; (4) Adjustment of catalyst package to counter the inhibiting effects of the siloxane. The use of a bare minimal amount of siloxane prevents excess siloxane from appearing in the surface of the article and causing subsequent paint wet-out and like difficulties. The third stream isolating of the siloxane prevents its carboxy-functional groups from reacting with the prepolymer or with other ingredients that may be P-585 carried in the polyol blend.

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