PROCESS FOR PREPARING POLYMERIC ACETALS WITH URETHANE,UREA AND AMIDO GROUPS

摘要

A process for the production of polymeric acetals containing urethane, carbamide and amide groups and having the following general formula (1): CH3CH3 ¦¦ -O-R-X-R'-X'-R-O-CH-O-R''-O-CH-A-(1) n WHERE R is an alkylene X=-NH-C-O-, -NH-C-, -NH-C-NH-; PARALLEL PARALLEL PARALLEL OOO R' is an alkylene, an arylene, a biarylene, or is absent; X'=-NH-C-O-, -NH-C-, -NH-C-NH-, PARALLEL PARALLEL PARALLEL OOO or is absent; R'' is an alkylene, an oxaalkylene, a cycloalkylene, an arylene, or a biarylene; A has the following general formula (II): CH3CH3 ¦¦ -O-R'''-O-CH-O-R''-O-CH-, (II) where R''' is chain of a polymeric diol having OH end-groups with a molecular weight of from 500 to 5,000, or is absent; N IS THE DEGREE OF POLYADDITION EQUAL TO FROM 10 TO 300, PREFERABLY FROM 20 TO 110, WHICH COMPRISES A POLYADDITION REACTION OF DIOLS OF THE FOLLOWING GENERAL FORMULA (III): HO-R-X-R'-X'-R-OH, (III) where R, R', X and X' are as in formula (I), or mixtures of said diols of formula (III) with polymeric diols having OH-end-groups of molecular wight of from 500 to 5,000, and divinyl ethers of the following general formula (IV): CH2 = CH-O-R''-O-CH = CH2, where R'' is as given by formula (I), in the presence of an acid catalyst.