Hitzehaertbare Einkomponentenmassen auf Grundlage von Polyurethanvorpolymerisaten

摘要

1,208,907. Curable polyurethane compositions; pentaco-ordinate silicon complexes. DOW CORNING CORP. 13 Nov., 1967 [12 Dec., 1966], No. 51430/67. Headings C3R and C3S. Curable polyurethane compositions comprise (1) a curable polyurethane prepolymer, and (2) a pentaco-ordinate silicon complex of the general formula wherein each R is a hydrogen atom or monovalent radical attached to the carbon atom via a carbon-to-carbon bond, R1 is a monovalent radical attached to the Si atom via a carbon-to-silicon bond or carbon-to-oxygento-silicon bond, and A is a cation formed from an amine containing an active hydrogen atom, there being sufficient of (2) present to cause (1) to cure upon heating of the composition. The prepolymers (1) are suitably based on polyether or polyester polyols. In the complex (2) R is suitably a hydrogen atom or a monovalent hydrocarbon, halogenohydrocarbon, aminohydrocarbon, cyanohydrocarbon or carboxyhydrocarbon radical and R1 is suitably a hydrocarbon or alkoxy radical containing 1 to 6 carbon atoms. The cation A may be formed from a mono-, di- or polyamine, preferably a primary amine. On heating, the amine is released from the complex and the prepolymer is cured. In examples, a polyurethane prepolymer is cured using complexes of the formula wherein (2) A is H 3 N(CH 2 ) 6 NH 3 , R is H and R1 is -O-C 2 H 5 , (3 and 4) A is [(CH 3 ) 2 N] 2 C = NH 2 , R is derived from propylene glycol (i.e. is CH 3 - or H and R1 is C 6 H 5 , (5) A is H 3 N(CH 2 ) 6 NH 3 , R is derived from propylene glycol (i.e. is CH 3 - or H) and R1 is -O-C 2 H 5 , (6) A is (H 3 NCH 2 CH 2 ) 2 NH, R is H and R1 is C 6 H 5 , (7) A is (H 3 NCH 2 CH 2 ) 2 NH, R is derived from propylene glycol (i.e. is CH 3 - or H) and R1 is -O-C 2 H 5 , and (8) A is H 3 N(CH 2 ) 6 NH 3 , R is CH 3 and R1 is C 6 H 5 . A pentaco-ordinate silicon complex of the formula is prepared by heating at reflux a mixture of phenyltrimethoxysilane, propylene glycol and tetramethyl guanidine in acetonitrile. A pentaco-ordinate silicon complex of the formula is prepared by reacting (C 2 H 5 O) 4 Si, ethylene glycol, hexamethylene diamine and acetonitrile. Specification 1,208,908 is referred to.