| 摘要 |
PURPOSE:A thermosetting resin which can give a molding excellent in mechanical strength, and resistance upon exposure to a high temperature and/or a solvent, comprising a specified polyurethane oligomer and a free radical generating catalyst. CONSTITUTION:A polyurethane oligomer with an active hydrogen/NCO equivalent ratio of 1/1-1.2/1 is obtained by reacting (a) a polyisocyanate (e.g., toluene diisocyanate) about 30-70% of which is contained as a trimer with (b) a hydroxyl group- or amino group-containing (substituted) acrylate and/or (substituted) acrylamide. The obtained polyurethane oligomer is mixed with a free radical generating catalyst (e.g., benzoyl peroxide) to form a thermosetting polyurethane liquid polymer composition.
|
