Process for making and using foam control compositions
First Claim
1. A process comprising the steps of:
- A) mixing, before step (B),(i) a finely divided filler comprising silica with a surface area as measured by BET measurement of at least 50 m2/g,(ii) a polyorganosiloxane having at least two reactive substituents capable of addition reaction with component (iii) via hydrosilylation, 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 whereinthe 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 and whereinthe foam control composition is combined with an aqueous environment 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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Accused Products
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.
19 Citations
23 Claims
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1. A process comprising the steps of:
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A) mixing, before step (B), (i) a finely divided filler comprising silica with a surface area as measured by BET measurement of at least 50 m2/g, (ii) a polyorganosiloxane having at least two reactive substituents capable of addition reaction with component (iii) via hydrosilylation, 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 and wherein the foam control composition is combined with an aqueous environment 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A process comprising the steps of:
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A) mixing, before step (B), (i) a finely divided filler comprising silica with a surface area as measured by BET measurement of at least 50 m2/g, (ii) a polyorganosiloxane having at least two reactive substituents capable of addition reaction with component (iii) via hydrosilylation, 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 and wherein foam control composition has a viscosity of from 20,000 to 100,000 mPa·
s measured at 25°
C., and wherein the foam control composition is combined with an aqueous environment 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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21. A process comprising the steps of:
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A) mixing, before step (B), (i) a finely divided filler comprising silica with a surface area as measured by BET measurement of at least 50 m2/g, (ii) a polyorganosiloxane having at least two reactive substituents capable of addition reaction with component (iii) via hydrosilylation, 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; wherein after step (B), the foam control composition ius emulsified as an oil-in-water emulsion, and wherein the foam control composition is combined with an aqueous environment 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. - View Dependent Claims (22)
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23. A process for making a foam control composition comprising a 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), a finely divided filler comprising silica with a surface area as measured by BET measurement of at least 50 m2/g, (i) a finely divided filler comprising silica with a surface area as measured by BET measurement of at least 50 m2/g, (ii) a polyorganosiloxane having at least two reactive substituents capable of addition reaction with component (iii) via hydrosilylation, and (iii) a resinous polyorganosiloxane having from 3 to 10 silicon-bonded reactive groups per molecule with each silicon-bonded reactive group being substituted on a different silicon atom, having a molecular weight of no more than 15,000, and being 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.
Specification