Reaction injection molding polyurea resin composition

A reaction injection molding polyurea resin composition comprising the reaction product of:

• (a) a polyoxyalkylenepolyamine having an average molecular weight greater than about 400 and a plurality of terminal primary or secondary amino groups,
• (b) an aromatic polyamine and/or xylylenediamine, and
• (c) a polyisocyanate,
• said polyoxyalkylenepolyamine containing dispersed therein a polymer prepared by the in situ polymerization of at least two different olefinically unsaturated monomers in the presence of a radical polymerization initiator,
• the first of said monomers being a monofunctional acrylate monomer whose homopolyer has a glass transition temperature (Tg) below -20.degree. C. and a solubility parameter between 9.2 and 10.5,
• the second of said monomers being a monofunctional acrylate monomer whose homopolymer has a solubility parameter less than 9.2 or greater than 10.5 or a monofunctional methacrylate monomer, the proportion of said first monomer being at least 20% by weight of the entire monomers, the ratio of the average amino equivalent of said polyamines (a) and (b) in combination to the average NCO equivalent of said polyisocyanate (c) being between about 1:0.7 to 1:1.5