Process for preparing a polysiloxane

Claim 2

A process for rendering flexible sheet material non-adherent to surfaces which normally adhere thereto which process consists essentially of: a. treating the sheet material with an aqueous emulsion containing: i. a neutralized polysiloxane emulsion produced by the process comprising: 1. homogenizing a mixture which consists essentially of: A. a compound of the formula (R 2 SiO) 4 wherein R is a monovalent hydrocarbon free of unsaturation; B. a compound of the formula: (RR.sup.1 SiO).sub.4 wherein R is the same as hereinabove defined and R 1 is a hydrocarbon radical having vinyl unsaturation; and C. a benzene sulfonic acid compound of the formula: ##STR6## wherein R 2 is an alkyl group of from 6-18 carbon atoms and; D. water; 2.

Claim 3

heating the homogenized mixture of (1) to form said polysiloxane; and 3. adding a neutralizing amount of an alkanolamine to said mixture to neutralize said benzene sulfonic acid and to form a neutralized emulsion of said polysiloxane, said polysiloxane having the formula: ##STR7## wherein R is a monovalent hydrocarbon radical free of unsaturation; R 1 is a hydrocarbon radical having vinyl unsaturation; x and y are positive integers so that the silanol stopped polysiloxane has from 0.1 to 1% by weight of R 1 groups and the viscosity of the polymer ranges between 25,000 centipoises and 1,000,000 centipoises; ii. an organic hydrogen polysiloxane having the formula: (R).sub.a (H).sub.b SiO.sub.(4.sub.-a.sub.-b)/2 wherein R is a monovalent hydrocarbon radical free of unsaturation; a is from 0 to 3; b is from 0.005 to 2.0 and the sum of a plus b is from about 0.9 to 3, there being at least two silicon-bonded hydrogen atoms per molecule; and iii. a platinum catalyst effective to cause copolymerization of (i) (ii); and

Claim 4

heating the homogenized mixture of (1) to form said polysiloxane; and 3. adding a neutralizing amount of an alkanolamine to said mixture to neutralize said benzene sulfonic acid and to form a neutralized emulsion of said polysiloxane, said polysiloxane having the formula: ##STR7## wherein R is a monovalent hydrocarbon radical free of unsaturation; R 1 is a hydrocarbon radical having vinyl unsaturation; x and y are positive integers so that the silanol stopped polysiloxane has from 0.1 to 1% by weight of R 1 groups and the viscosity of the polymer ranges between 25,000 centipoises and 1,000,000 centipoises; ii. an organic hydrogen polysiloxane having the formula: (R).sub.a (H).sub.b SiO.sub.(4.sub.-a.sub.-b)/2 wherein R is a monovalent hydrocarbon radical free of unsaturation; a is from 0 to 3; b is from 0.005 to 2.0 and the sum of a plus b is from about 0.9 to 3, there being at least two silicon-bonded hydrogen atoms per molecule; and iii. a platinum catalyst effective to cause copolymerization of (i) (ii); and

Claim 5

b. thereafter drying the treated material. 2. The process of claim 1 wherein said polysiloxane has the formula: ##STR8##

Claim 6

The process of claim 1 wherein the platinum catalyst is included in the homogenized mixture of step (1).

Claim 7

The process of claim 1 wherein the heating step (2) comprises heating the homogenized mixture at a temperature of from 40°-100°.

Claim 8

The process of claim 1 wherein heating step (2) is followed by a cooling step.

Claim 9

The process of claim 5 wherein the benzene sulfonic acid is dodecylbenzenesulfonic acid.

Claim 10

The process of claim 6 wherein the alkanolamine is selected from compounds of the formula; (R.sup.3 OH).sub.3 N wherein R 3 is lower alkylene of from 1 to 8 carbon atoms.

Claim 11

A process as defined in claim 3 wherein the platinum catalyst is present in an amount to provide one platinum atom per 100 to 1,000,000 silicon-bonded vinyl groups in the poly-organosiloxane component.

Claim 12

A process as defined in claim 1 wherein the aqueous emulsion comprises: i. from 1 to 50% of the polysiloxane; ii. from 0.01 to 5% of the organic hydrogen polysiloxane; iii. from 0.00001 to 0.0005% of platinum in the form of a salt or complex; and iv. from 60 to 98% of water.