Process of preparation of synthetic resins by reacting a cross-linked isocyanate polyaddition product with low molecular weight polyisocyanate followed by reaction with an amino alkyl silane

Claim 1

A process for the preparation of a synthetic resin capable of being cross-linked by moisture which comprises reacting, in a first step, a high molecular weight isocyanate polyaddition product cross-linked via allophanate, biuret or uretone imine groups in a polar solvent with a low molecular weight polyisocyanate at a temperature of 90° to 200°C and then reacting the resulting linearized product with an amino alkyl silane selected from a group consisting of ##EQU28## or ##EQU29## or (III) (RO).sub.3.sub.-a Si(R').sub.a --CH.sub.2 --(CH.sub.2).sub.n --NH-R'" wherein R represents a C 1 -C 18 alkyl or C 4 -C 14 cycloalkyl radical or a phenyl radical, R' represents an optionally halogenated or cyanosubstituted C 1 -C 10 alkyl, C 4 -C 10 cycloalkyl or C 6 -C 10 aryl radical, R" represents a hydrogen atom or a methyl or phenyl radical, R'" represents a hydrogen atom or an optionally halogenated or cyanosubstituted C 1 -C 18 alkyl, C 4 -C 14 cycloalkyl or C 6 -C 14 aryl radical, R iv represents a divalent aliphatic, cycloaliphatic, araliphatic or aromatic hydrocarbon radical containing 2 to 16 carbon atoms, R v represents hydrogen or ##EQU30## a = 0, 1 or 2 and n = 1-7, said polar solvent being selected from the group consisting of dimethyl formamide, dimethyl acetamide, tetramethyl urea, dimethyl sulphoxide, N-methyl pyrrolidone, glycol carbonate, caprolactone and butylactone.