| 摘要 |
1521690 Polyurethanes IMPERIAL CHEMICAL INDUSTRIES Ltd 3 Dec 1975 [11 Dec 1974] 53551/74 Heading C3R [Also in Division C2] Polyurethanes are prepared by reacting a poly-functional hydroxylic compound or a hydroxyl-ended polymer with an isocyanate which has been prepared by heating, in the presence of sulphur dioxide, a furoxan having the Formula I wherein R and R<1>, which may be the same or different, are C1-18 aliphatic or aromatic hydrocarbon groups or together form a second ring fused to the furoxan ring.
|
