JP2940998B

PURPOSE:To prepare a molded resin article having a high modulus and good curing properties by mixing a specific polycryclic aliph. diisocyanate with a polyether having terminal aliph. amino groups and molding the resulting mixture by reaction injection molding. CONSTITUTION:A polycryclic aliph. diisocyanate of the formula (wherein (k) is 0-2, (j) is 1-5, (m) is 1-5, and (n) is 0-2 provided that (k) and (n) are not simultaneously 0) is mixed with a polyether which has a mol.wt. of 700-12000, at least two active hydrogen groups in the molecule, and terminal aliph. amino groups and in which at least 70% of the active hydrogen groups are primary and/or secondary amino groups. The resulting mixture is molded by reaction injection molding to give a molded resin article. Thus is obtd. a non-yellowing polyurea elastomer, which is weather resistant and can be used widely.