Patent ID: 7902313

Claim:
A process for the preparation of poly(silyl ester)s comprising a structural unit of the formula (I) wherein each R 4 and R 5 is hydroxyl or is independently selected from hydrogen, alkyl, cycloalkyl, aryl, alkoxyl, aryloxyl, -L′-SiR 1 R 2 —, -L′-(SiR 4 R 5 L′)n-SiR 1 R 2 —, alkenyl, alkynyl, aralkyl and aralkyloxyl radicals optionally substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxyl, aralkyl, aralkyloxyl, hydroxyl, aryl, aryloxyl, halogen, amino and amino alkyl radicals, or each R 4 and/or R 5 is independently an —O—Z(O)-L- group terminating with —SiR 1 R 2 R 3 and/or —O—Z(O)—R 7 , and wherein when R 4 or R 5 is selected as -L′-(SiR 4 R 5 L′)n-SiR 1 R 2 —, the R 4 and R 5 groups attached to the silicon radical in the selected group are not themselves -L′-(SiR 4 R 5 L′)n-SiR 1 R 2 —, wherein each R 1 and R 2 is independently selected from hydrogen, hydroxyl, alkyl, cycloalkyl, alkenyl, alkynyl, alkoxyl, -L′-SiR 4 R 5 R 10 , aryl, aryloxyl, aralkyl and aralkyloxyl radical optionally substituted by one or more substituents independently selected from the group consisting of alkyl, alkoxyl, aralkyl, aralkyloxyl, aryl, aryloxyl, halogen, hydroxyl, amino and amino alkyl radicals, or each R 1 and/or R 2 is independently an —O—Z(O)-L- group terminating with —SiR 1 R 2 R 3 and/or —O—Z(O)—R 7 , where R 10 has the same definition as R 7 below, wherein L represents a hydrocarbyl or substituted hydrocarbyl group, wherein said substituted hydrocarbyl is substituted by one or more substituents independently selected from the group consisting of alkyl, cycloalkyl, carboxyl, substituted carboxyl, alkoxyl, aralkyl, aralkyloxyl, aryl, aryloxyl, hydroxyl, halogen, amino radical, amino alkyl radical, and a polymer with pendant acid groups, L′ represents O, S, NR 6 , or L-(NR 6 -L) p (where p=1 to 10), where R 6 has the same definition as R 7 below, or L, each n independently represents a number of —Si(R 4 )(R 5 )-L′- groups from 0 to 1000, and y represents a number from 2 to 100000, wherein the process comprises the step of reacting a polyacid of formula (II) wherein Z(O)OH represents the acid moiety attached to L, m is an integer from 2 to 100000, and L is as defined above, with a polyacyloxysilyl derivative of formula (III) wherein R 1 , R 2 , R 4 , R 5 , L′ and n are as defined above, and R 7 is a hydrogen atom, an aralkyl, aryl, alkenyl, alkynyl, or alkyl group optionally substituted with one or more substituents selected from the equivalent substituents as defined for R 1 , R 2 , R 4 and R 5 above, and R 3 is the group —O—Z—(O)—R 9 , where R 9 has the same definition as R 7 , while removing the formed acid group(s) of formula (IV), (V) and (VI), R 7 Z(O)OH (IV) R 9 Z(O)OH (V), R 8 Z(O)OH (VI), from the system, wherein Z in formula (I), (II), (III), (IV), (V), and (VI) is independently C, POH, P or S═O with a proviso that R 1 , R 2 , R 4 and R 5 in formula (III) is —O—Z(O)—R 8 when an equivalent group in formula (I) is —O—Z(O)-L-, wherein R 8 has the same definition as R 7 .