| 摘要 |
PURPOSE:To provide the subject two pack type elastomer prevented in the discoloration, etc., and reduced in the early yellowing degree after molded, by compounding a specific isocyanate component with a polyol containing an UV ray absorbent and a foaming agent. CONSTITUTION:The objective elastomer comprises (A) an isocyanate component containing a free organic diisocyanate prepared by reacting a semicarbazide or semicarbazinic acid ester preferably in a 0.3-10 equivalent % with a product obtained from the reaction of an organic diisocyanate (e.g. 4,4'-diphenylmethane diisocyanate) with a small amount of a polyol (e.g. ethylene glycol) and (B) a polyol component containing an UV ray absorbent [e.g. 2-(2'-hydroxy-5'- methylphenyl)benzotriazole] and a foaming agent (e.g. water, trichlorofluoromethane). |
