Method of manufacturing silicone emulsions
First Claim
1. A method of making an emulsion comprising the steps of (A) forming a mixture by combining 35 to 75 percent by weight of a polysiloxane and 0.25 to 2.0 percent by weight of a primary nonionic surfactant having an HLB value of 10 to 19, and stirring the mixture until uniform:
- (B) adding and dispersing 3-6 percent by weight of a first portion of surfactant free water in the mixture, the first portion of surfactant free water being added and dispersed in the mixture gradually over a period of time in a series of from about five to about ten separate incremental steps;
(C) adding to the mixture 0.25 to 2.0 percent by weight of a secondary nonionic surfactant having an HLB value of 1.8-15;
(D) stirring the mixture until the particle size of the polysiloxane in the mixture is in the range of 1-100 microns; and
(E) adding a second portion of water to the mixture in an amount to provide a total content of water in the product of 25-65 percent by weight based on the total weight of the mixture, the second portion of water being added to the mixture gradually over a period of time in a series of from about five to about ten separate incremental steps.
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Abstract
A method is described for making an emulsion in which a mixture is formed containing a polysiloxane and a primary nonionic surfactant having an HLB value of 10 to 19. There is added to the mixture a first portion of surfactant free water gradually in a series of separate incremental steps. This is followed by the addition to the mixture of a secondary nonionic surfactant having an HLB value of 1.8-15. The mixture is stirred until the particle size of the polysiloxane in the mixture is in the range of 1-100 microns. A second portion of water is added to the mixture in an amount sufficient to provide a total content of water in the product of 25-65 percent by weight.
26 Citations
13 Claims
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1. A method of making an emulsion comprising the steps of (A) forming a mixture by combining 35 to 75 percent by weight of a polysiloxane and 0.25 to 2.0 percent by weight of a primary nonionic surfactant having an HLB value of 10 to 19, and stirring the mixture until uniform:
- (B) adding and dispersing 3-6 percent by weight of a first portion of surfactant free water in the mixture, the first portion of surfactant free water being added and dispersed in the mixture gradually over a period of time in a series of from about five to about ten separate incremental steps;
(C) adding to the mixture 0.25 to 2.0 percent by weight of a secondary nonionic surfactant having an HLB value of 1.8-15;
(D) stirring the mixture until the particle size of the polysiloxane in the mixture is in the range of 1-100 microns; and
(E) adding a second portion of water to the mixture in an amount to provide a total content of water in the product of 25-65 percent by weight based on the total weight of the mixture, the second portion of water being added to the mixture gradually over a period of time in a series of from about five to about ten separate incremental steps. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- (B) adding and dispersing 3-6 percent by weight of a first portion of surfactant free water in the mixture, the first portion of surfactant free water being added and dispersed in the mixture gradually over a period of time in a series of from about five to about ten separate incremental steps;
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12. A method of making an emulsion comprising the steps of (A) forming a mixture by combining 35 to 75 percent by weight of a polysiloxane and 0.25 to 2.0 percent by weight of a primary nonionic surfactant having an HLB value of 10 to 19, and stirring the mixture until uniform:
- (B) adding and dispersing 3-6 percent by weight of a first portion of surfactant free water in the mixture, the first portion of surfactant free water being added and dispersed in the mixture gradually over a period of time in a series of a plurality of separate incremental steps;
(C) adding to the mixture 0.25 to 2.0 percent by weight of a secondary nonionic surfactant having an HLB value of 1.8-15;
(D) stirring the mixture until the particle size of the polysiloxane in the mixture is in the range of 1-100 microns; and
(E) adding a second portion of water to the mixture in an amount to provide a total content of water in the product of 25-65 percent by weight based on the total weight of the mixture, the second portion of water being added to the mixture gradually over a period of time in a series of a plurality of separate incremental steps. - View Dependent Claims (13)
- (B) adding and dispersing 3-6 percent by weight of a first portion of surfactant free water in the mixture, the first portion of surfactant free water being added and dispersed in the mixture gradually over a period of time in a series of a plurality of separate incremental steps;
Specification