Process For Making and Using Foam Control Compositions
First Claim
1. A process for making a foam control composition comprising a branched or cross-linked polyorganosiloxane material in which is dispersed a finely divided filler, whose surface is hydrophobic, which comprises the steps ofA) mixing, before step (B), (i) a finely divided filler, (ii) a polyorganosiloxane having at least two reactive substituents capable of addition reaction with component (iii) via hydrosilylationQ and (iii) a polyorganosiloxane having at least three reactive substituents, capable of addition reaction with component (ii) via hydrosilylation;
- B) followed by causing hydrosilylation reaction of components (ii) and (iii) in the presence of a transition metal catalystwherein the hydrosilylation reaction is conducted until the reaction mixture at least partially gels, and shearing forces are applied to this at least partially gelled reaction mixture.
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Abstract
A process for making a foam control composition comprising a cross-linked polyorganosiloxane in which is dispersed a filler, with hydrophobic surface, comprising step (A) mixing (i) a finely divided filler, (ii) a polyorganosiloxane having on at least two reactive substituents, for example on average two reactive substituents, and (iii) a polyorganosiloxane having at least three reactive substituents, capable of addition reaction via hydrosilylation; (B) hydrosilylation reaction of components (ii) and (iii) until the mixture at least partially gels, followed by applying shearing forces to this at least partially gelled mixture. Optionally step (A) comprises a diluent or solvent and after step (B) an emulsification step is carried out to make the foam control composition into an O/W emulsion. Also a process for controlling foam in an aqueous environment by using a foam control composition according to the invention, selected from inks, coatings, paints, detergents, black liquor of from those encountered during pulp and paper manufacture, waste water treatment, textile dyeing processes or the scrubbing of natural gas.
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Citations
20 Claims
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1. A process for making a foam control composition comprising a branched or cross-linked polyorganosiloxane material in which is dispersed a finely divided filler, whose surface is hydrophobic, which comprises the steps of
A) mixing, before step (B), (i) a finely divided filler, (ii) a polyorganosiloxane having at least two reactive substituents capable of addition reaction with component (iii) via hydrosilylationQ and (iii) a polyorganosiloxane having at least three reactive substituents, capable of addition reaction with component (ii) via hydrosilylation; -
B) followed by causing hydrosilylation reaction of components (ii) and (iii) in the presence of a transition metal catalyst wherein the hydrosilylation reaction is conducted until the reaction mixture at least partially gels, and shearing forces are applied to this at least partially gelled reaction mixture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification