Abstract: The preparation of pure mixed alkoxyaminosilanes is described corresponding to the general formula:R.sub.m Si(OR').sub.n (NR"R'").sub.pwherein:R is hydrogen, short chain alkyl or alkenyl or aryl;R" and R'" are separately either hydrogen, short chain alkyl or aryl, at least one being other than hydrogen;R' is short chain alkyl or aryl; andm, n and p are integers such that m+n+p=4 and n and p are at least one each.The obtained compounds are employed in endcapping of polysiloxanes having terminal silane groups.

Abstract: Ethylene bridged benzylamine trifunctional silanes are provided having the general formula:Z--CH.sub.2 --Ph--CH.sub.2 CH.sub.2 --SiX.sub.3wherein Ph is a phenyl group, at least one X is a hydrolyzable group and Z is a non-hydrolyzable amine functional group. At least one X group is that which is displaced by hydrolysis during the well known reactions of silanes with siliceous substrates, and is preferably methoxy, ethoxy or methoxyethoxy. The Z group is intended to react and bond with polymers in the formation of polymer composites reinforced with siliceous substrates such as glass fibers. The Z group is preferably an amine or alkyl diamine group. The silanes of the invention have excellent thermal stability so that they may be used as coupling agents for composites in which the polymers are processed at temperatures in excess of 350.degree. C. and/or are subject to temperatures in excess of 150.degree. C. for extended periods of time.

Abstract: Organic polysilanes may be produced in a simpler, safer and more economic manner by reacting an organohalosilicon hydride with lithium metal or lithium-alkali metal alloy. According to the reaction the silicon-silicon bonds of the organopolysilane are formed by the removal of halogen and hydrogen from the hydride. Particularly important is the formation of dodecamethylcyclohexasilane by the reaction of dimethyl chlorosilane with lithium metal. Simpler polysilanes may be produced by adding to the reaction mixture endcappers such as trifunctional organohalosilanes without an Si-H bond.