Amino acid functionalized silicones and method for preparation

A method of preparing an organofunctional silicone composition comprising units of the formula

• (i) TD.sub.x M'.sub.3 ;
• (ii) TD.sub.x D'.sub.y M'.sub.3 ;
• (iii) TD'.sub.y M'.sub.3 ;
• (iv) TD.sub.x D'.sub.y M.sub.3 ;
• (v) TD'.sub.y M'.sub.3 ;
• (vi) M'D.sub.x D'.sub.y M';
• (vii) M'D.sub.x M';
• (viii) MD'.sub.y M;
• (ix) MD.sub.x D'.sub.y M;
• (x) M'D'.sub.y M';
• (xi) M'Q;
• (xii) (D').sub.z ;
• or
• (xiii) a combination of any of the foregoing wherein T represents a trifunctional siloxy group of the formula RSiO.sub.3/2 wherein R represents independently a saturated or unsaturated monovalent hydrocarbon radical;
• D represents a difunctional siloxy group of the formula R.sub.2 SiO.sub.2/2 wherein each R is independently defined as above;
• D' represents a difunctional siloxy group of the formula RR.sup.1 SiO.sub.2/2 wherein each R is independently defined as above, R.sup.1 represents a carboxyalkyl aminoalkyl group of the formula (HO.sub.2 C)(CH.sub.2).sub.m N(R.sup.2)(CH.sub.2).sub.n where R.sup.2 represents hydrogen or an alkyl group of from 1 to about 10 carbon atoms, and m and n each independently vary from 1 to about 10;
• M represents a monofunctional siloxy group of the formula R.sub.3 SiO.sub.1/2 wherein each R is independently defined as above;
• M' represents a monofunctional siloxy group of the formula R.sub.2 R.sup.1 SiO.sub.1/2 wherein each R is independently defined as above and R.sup.1 is as above defined;
• Q represents a quadrifunctional siloxy of the formula SiO.sub.4/2 ;
• x is greater than 1, y is greater than 1 and z is equal to or greater than 3;
• comprising the steps of:
• (a) hydrosilating a silicone hydride compound with a lactam to form an amide functionalized silicone;
• and
• (b) hydrolyzing the amide functionalized silicone of step (a) in the presence of an acid catalyst to produce an amino acid functionalized silicone.