PRODUCTION OF POLYURETHANE COMPOUNDS

摘要

1341089 Polymers containing methane groups TAKEDA YAKUHIN KOGYO KK 21 Dec 1971 [28 Dec 1970] 59371/71 Headings C3A and C3R Polymers containing urethane groups are prepared by reacting (a) an oxadiazinone compound obtained by reacting an organic isocyanate with carbon dioxide with (b) a polyol having at least 2 OH groups in the presence of (c) an organotin compound of the formula wherein R1, R2, R3 and R4, which may be the same or different, are C 1-8 alkyl groups, and each of X1 and X2, which may be the same or different, is a halogen atom, a hydroxyl group, a C 1-4 alkoxy group, an isothiocyanate group or a C 1-18 carboxylic acyloxy group, subject to the proviso that X1 and X2 cannot both be hydroxyl groups. The organic isocyanate may be a monoisocyanate, but is most preferably a diisocyanate, especially an aliphatic or araliphatic diisocyanate. The diisocyanate may also be used in the form of a prepolymer which may be blocked. Suitable polyols (b) are ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 2,2,4-trimethylpentane-1,3- diol, glycerol, hexanetriol, trimethylolpropane, pentaerythritol, sorbitol, sucrose, cellulose, polyvinyl alcohol, polyether polyols and polyester polyols. Numerous tin compounds (c) are listed, examples of which are tetra-butyl-1,3-diacetoxydistannoxane, tetrabutyl-1-acetoxy-3-hydroxydistannoxane, tetrabutyl-1-chloro-3-hydroxydistannoxane and tetra-butyl-1-acetoxy-3-methoxy-distannoxane. In typical Examples, (1) di(isocyanatomethyl)benzene is reacted with carbon dioxide in the presence of tributylphosphine to form an oxadiazinone compound which is reacted with polypropylene glycol in the presence of tetrabutyl-1,3-diacetoxy-distannoxane and (2) benzyl isocyanate is reacted with carbon dioxide in the presence of tributyl phosphine to form an oxadiazinone compound which is reacted with cellulose in the presence of tetrabutyl-1-acetoxy-3-hydroxy-distannoxane.