| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject composition excellent in compatibility, storage stability, and expandability, capable of giving foams excellent in thermal insulation and cell stability over time, thus useful for thermal insulation materials, etc., comprising each specific polyisocyanate component and polyol component. SOLUTION: This composition comprises (A) a polyisocyanate component composed of a surfactant, a catalyst, and a diphenylmethane-based polyisocyanate composed of polyphenylmethane polyisocyanate A1 containing 0.1-30wt.% of an isomer other than 4,4'-diphenylmethane diisocyanate (Z) made up of binuclear form and diphenylmethane diisocyanate A2 composed of >=45wt.% of Z and <=55wt.% of an isomer other than (Z), where A1 or A2 contains partially urethanated product as a part thereof, and the weight ratio A1 /A2 of 0.5-25, and (B) a polyol component composed of a polyol 300-700 in number-average molecular weight (Mn ), another polyol 62-<300 in Mn , Mannich polyol, foaming agent, trimerizing catalyst and additive. |
