Elastomer and process for production thereof
AssigneeMitsui Toatsu Chemicals, Inc.
InventorsYuji Uchida, Yoshio Yoshida, Toshikazu Kaneda, Toshiaki Moriya, Tsutomu Kumazawa
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Abstract
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.
Claims14
An elastomer composition molded by a reaction injection molding of a member selected from the group consisting of polyurethane resins, polyurea resins, polyurethane/urea resins and polyurea/amide resins, said composition containing a polyester condensate as an internal release agent, said polyester condensate having a hydroxyl group and further having an amino and/or imino group at the end of the molecule and being derived from a polyester condensate produced by transesterification of a saturated or unsaturated fatty acid having a hydroxyl group.
An elastomer according to claim 14 in which the polyester condensate having a hydroxyl group and further having an amino and/or imino group at the end of the molecule is derived from a condensate of a ricinoleic acid ester selected from the group consisting of a condensate of the formula, ##STR19## where r and s are integers of 0-7 and the total of r and s is 1-7, j and k are integers and the total of j and k is 1-25, and R.sub.1 is selected from the group consisting of hydrogen and C.sub.1 -C.sub.4 alkyl, and a condensate of the formula, ##STR20## where t is an integer of 1-4, j and k are integers and the total of j and k is 1-25, R.sub.2 and R.sub.3 are similar or dissimilar and selected from the group consisting of hydrogen and C.sub.1 -C.sub.4 alkyl.
Dependencies are inferred from the claim text.