Light stable polyurethane elastomer prepared from aliphatic...

Details Light stable polyurethane elastomer prepared from aliphatic... Light stable polyurethane elastomer prepared from aliphatic...

C - Chemistry, Metallurgy

08

G

402/131, 402/163

C08G 18/24 (2006.01) C08G 18/40 (2006.01) C08G 18/73 (2006.01) C08G 18/75 (2006.01) C08G 18/76 (2006.01)

Patent

CA 1059691

ABSTRACT OF THE DISCLOSURE A light stable polyurethane elastomer is prepared in the absence of solvent from a polyol, a chain extender and an aliphatic polyisocyanate using a thio tin organic compound, containing sulfur directly attached to the tin, as a heat activated catalyst. E.g., a solventless liquid composition comprising an hydroxy-terminated polyester, a chain extender, and hydrogenated MDI, containing dibutyl- tin S,S-bis(isooctyl mercaptoacetate) as a catalyst, has a pot life in excess of 25 minutes at room temperature but upon heating 1 minute at 375°F. gels to a solid state. Because of this combination of long pot life and rapid cure, the composition is suitable for such applica- tions as making coated fabrics and films. and in other liquid processing techniques, e.g., rotational casting, liquid injection molding, and the like.

218012

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