Dow Corning Corporation

Steven H Waier

Howard M Bank

William Charles Maki

Bryan Christopher McDonald

Donna Gyles-Mayon

ChiTang Li

Bryan C Mcdonald

A method of preparing 3-&lsqb;N-(2-aminoethyl)&rsqb;aminoalkylalkoxysilanes in which ethylenediamine, ethylenediamine hydrochloride salt, and a suitable &ohgr;-chloroalkylalkoxysilane are fed to a reactor at a feed ratio of 3-40 moles total ethylenediamine per mole of chloroalkylalkoxysilane under reaction conditions to produce a such aminoalkylalkoxysilane. The proportions of ethylenediamine and ethylenediamine hydrochloride salt are controlled such that a phase containing the diamine salt is present in said reactor separate from a phase containing the aminoalkylalkoxysilane. Following said reaction, the salt phase is separated from the silane phase for recycle to the two phase reactor.

Method of making N-&lsqb;2-aminoethyl&rsqb; aminoalkylalkoxysilanes with ethyenediamine salt recycle

The present invention relates to a method for preparing a platinum-organosiloxane complex which comprises (I) reacting (a) a platinous halide having an average crystal size of less than 2500 Angstroms and (b) an organosiloxane having from 2 to 4 silicon- bonded organic groups having from 2 to 6 carbon atoms and having terminal olefinic unsaturation, the remaining silicon- bonded organic substituents being selected from alkyl groups having from 1 to 6 carbon atoms and phenyl groups, wherein said reaction is carried out in the presence of a polar organic liquid which is at least a partial solvent for platinous halide, and (II) neutralizing the reaction mixture of (I). The complexes of the instant invention are useful as catalysts for hydrosilylation reactions.

Method for the preparation of platinum complexes

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Midland, MI, United States of America

Steven H Waier