| 摘要 |
1297547 Oxymethylene segmented copolymer compositions CELANESE CORP 4 Nov 1970 [5 Nov 1969] 52352/70 Headings C3P and C3R A composition comprises (a) a segmented copolymer formed by reaction of an isocyanato or isothiocyanato containing polymer or of a coupling agent containing two or three isocyanato or isothiocyanato groups and a polymer containing groups reactive therewith, together with an oxymethylene polymer, suitably in which the end-groups have not been stabilized, and (b) an organic phosphite P(OR) 3 , where the R's are certain hydrocarbon groups or are hydroxyalkyl groups. The composition may be formed by simple blending or by mixing the polymeric components of (a) together with (b) to form the block copolymer and the composition simultaneously. In examples, an oxymethylene-oxyethylene copolymer is reacted with an isocyanto-terminated polyurethane in the presence of tris-(mono- and di-nonylphenyl) phosphite mixture, tris-(monononyl phenyl) phosphite, triphenyl phosphite, tris-(dinonylphenyl) phosphite, trinonyl phosphite, tris- (trimethylol propane) phosphite or di-(nonylphenyl) neodecyl phosphite. |
