Patent ID: 6750361
Filing Date: 2004-06-15
Classification: C07F

Abstract:
A process for preparing an aminofunctional organoalkoxysilane of formula IR2Nâ€”(CH2)yâ€”Si(OR1)3âˆ’nR2nâ€ƒâ€ƒ(I), wherein the R groups bonded to nitrogen are identical or different and each individual R group is hydrogen, an alkyl radical having from 1 to 4 carbon atoms, an aryl radical or an arylalkyl radical,R1 is an alkyl radical having from 1 to 8 carbon atoms or an aryl radical, R2 is an alkyl radical having from 1 to 8 carbon atoms or an aryl radical, y is 2, 3 or 4 and n is 0, 1 or 2, comprising: reacting a chlorofunctional organoalkoxysilane of formula II Clâ€”(CH2)yâ€”Si(OR1)3âˆ’nR2nâ€ƒâ€ƒ(II), wherein R1, R2, y and n are as defined above, with ammonia or an organic amine of formula IIIHNR2â€ƒâ€ƒ(III), wherein the two R groups are identical or different and each is defined as described above;separating organic amine hydrochloride or ammonium chloride by-product which is formed in the reaction; distilling the resulting crude product to produce a distillate comprising aminofunctional organoalkoxysilane of formula I and a cyclic aminosilane; and converting the cyclic aminosilane to the aminofunctional organoalkoxysilane by treating the distillate with a treating agent that consists essentially of an alcohol.