Patent ID: 8426628

Claim:
A process for preparing an alkylaminoalkylalkoxysilane of formula I R—(NR′)—Y—Si(R 1 ) n (OR 2 ) 3-n (I), wherein R is a linear, branched, or cyclic alkyl group having 1 to 12 carbon atoms, R′ is a hydrogen (H) or a linear, branched, or cyclic alkyl group having 1 to 12 carbon atoms, Y is a bivalent alkyl group selected from the group consisting of —CH 2 —, —(CH 2 ) 2 —, —(CH 2 ) 3 , —(CH 2 )(CH(CH 3 ))(CH 2 )—, and —(CH 2 ) 4 —, R 1 and R 2 groups are the same or different and are each a linear or branched alkyl group having 1 to 4 carbon atoms, and n is 0, 1, or 2, the method comprising: (A) reacting an alkylamine of formula II, in excess, R(NR′)H (II), wherein R is a linear, branched, or cyclic alkyl group having 1 to 12 carbon atoms, and R′ is a hydrogen (H) or a linear, branched or cyclic alkyl group having 1 to 12 carbon atoms, with a haloalkylalkoxysilane of formula III X—Y—Si(R 1 ) n (OR 2 ) 3-n (III), wherein X is Cl or Br, Y is a bivalent alkyl group selected from the group consisting of —CH 2 —, —(CH 2 ) 2 —, —(CH 2 ) 3 —, —(CH 2 )(CH(CH 3 ))(CH 2 )—, and —(CH 2 ) 4 —, R 1 and R 2 groups are the same or different and are each a linear or branched alkyl group having 1 to 4 carbon atoms, and n is 0, 1, or 2; (B) distilling off excess alkylamine from a remaining product mixture; (C) at the same time, adding the alkylaminoalkylalkoxysilane to the remaining product mixture, comprising alkylamine hydrohalide and alkylaminoalkylalkoxysilane hydrohalide, and removing the alkylamine released as a result from the mixture, to give a remaining product or product hydrohalide mixture and (D) working up the remaining product or product hydrohalide mixture.