Mitsui Toatsu Chemicals, Incorporated

Tsutomu Kumazawa

Yoshio Yoshida

Toshiaki Moriya

Toshikazu Kaneda

Yuji Uchida

Hiroshi Inoue

Hiroshi Ueda

An elastomer is molded by a reaction injection molding of polyurethane resins, polyurea resins, polyurethane/urea resins and polyurea/amide resins in the presence of an internal release agent which is a polyester condensate of a saturated or unsaturated fatty acid having a hydroxy group produced by transesterification or a molecular end-aminated or iminated polyester condensate. The elastomer has a good releasing property and a good coating property.

Elastomer and process for production thereof

An elastomer is molded by a reaction injection molding of polyurethane resins, polyurea resins, polyurethane/urea resins and polyurea/amide resins in the presence of an internal release agent which is a polyester condensate of a saturated or unsaturated fatty acid having a hydroxy group produced by transesterification or a molecular endaminated or iminated polyester condensate. The elastomer has a good releasing property and a good coating property.

There is disclosed a resin composition comprising a product produced by the reaction of (a) a prepolymer prepared by reacting a diisocyanate with a hydroxy fatty acid ester or a mixture of a hydroxy fatty acid ester and a polyether polyol, with (b) at least one member selected from the group consisting of aromatic polyamines, polyether polyamines and polyether polyimines or a mixture of such a member as above and a polyether polyol. The resin composition is useful as an internal release agent for resins for reaction injection molding.

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Kanagawa, Japan

Tsutomu Kumazawa