| 摘要 |
PURPOSE:To obtain an urethane handle with small temperature dependency, by molding using a semi-rigid integral skin polyurethane foam prepared from polyether polyol, polymer polyol, crosslinking agent, foaming agent, catalyst, pigment, etc. CONSTITUTION:The objective urethane handle can be obtained by carrying out a RIM molding circumferentially on core 1, using the following components: (A) polyether polyol and/or polymer polyol, (B) crosslinking agent (e.g. diethylene glycol), (C) foaming agent, (D) catalyst (e.g. triethylenediamine), (E) pigment, and (F) as isocyanate component, a mixture of pure MDI and crude MDI (pref. a weight ratio of the former to the latter falling between 9/1 and 4/6) to form semi-rigid integral urethane layer 2. Said pure MDI represents 4,4'-diphenylmethane diisocyanate, etc. whereas said crude MDI polymeric diphenylmethane diisocyanate, etc.
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