| 摘要 |
1,220,715. Polyurethanes. ALLIED CHEMICAL CORP. 12 Sept., 1968 [6 Oct., 1967], No. 43529/68. Heading C3R. [Also in Division C2] Polyurethane compositions are obtained by reacting a polyol with 4,41-methylene bis (cyclohexyl isocyanate) which is liquid at about 25‹ C. which comprises more than 65% by weight of the cis/trans isomer, the ratio of total trans to total cis moieties being less than 55 to 45. Specified polyols are caprolactone polyester and castor oil. |
