Polishing agent composition

Claim 1

A polishing agent composition containing a polyorganosiloxane preparation comprising: (A) from 4 to 40% by weight of a benzene soluble polyorganosiloxane resin comprising: (1) 70 to 100 mole percent, (R 1 ) 3 SiO 1/2 units and SiO 2 units, and (2) 0 to 30 mole percent (R 2 ) 2 SiO units and having Si bonded OR 3 groups wherein R 1 and R 2 represent the same or different substituted or unsubstituted monovalent hydrocarbon groups and R 3 represents a hydrogen atom or a monovalent hydrocarbon group of from 1 to 6 carbon atoms; (B) from 55 to 95% by weight of a liquid linear or branched polyorganosiloxane terminated by (HO)(R 4 ) 2 SiO 1/2 units or (R 4 ) 3 SiO 1/2 units, and whose units other than the terminal units comprise 90 to 100 mole percent (R 5 ) 2 SiO units and 0 to 10 mole percent (R.sup.5).sub.a SiO.sub.4-a/2 units where a equals 0 or 1, R 4 and R 5 represent the same or different substituted or unsubstituted monovalent hydrocarbon groups; and (C) from 1 to 5% by weight of an amino group-containing alkoxysilane represented by the general formula: ##STR3## wherein R 6 represents an alkyl group of from 1 to 4 carbon atoms, R 7 represents a substituted or unsubstituted monovalent hydrocarbon group, R 8 represents a hydrogen atom or an amino group-terminated aminoalkyl group of from 1 to 10 carbon atoms and b represents 2 or 3.