# US 7,407,991 B2 · Silicone foam control compositions comprising a siloxane fluid and a mixture of glycerol mono/di/triesters > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,407,991 B2 - Document ID: US7407991B2 - Status: Granted - Kind: B2 - Application number: 10/521,416 - Filed: 2003-08-01 - Published: 2005-10-13 - Granted: 2008-08-05 - Earliest claimed: 2002-08-16 - Assignees: Dow Corning Corporation - Inventors: Serge Creutz; Guzman Nachon; Houria Seghir; Bertrand Michel; Virginie Caprasse; Louise Batchelor - Web page: https://patentgrep.com/patent/US7407991B2 ## CPC - B01D 19/0404: {characterised by the nature of the chemical substance} - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) ## Abstract A foam control composition comprises a polydiorganosiloxane fluid comprising units of the formula where each group R, which may be the same or different, is selected from an alkyl group having 1 to 36 carbon atoms or an aryl group or aralkyl group having up to 36 carbon atoms, the mean number of carbon atoms in the groups R being at least 1.3, and an additive composition having a melting point of at least 35° C. comprising 5-50 parts by weight of a non-polar component (A) and 50-95 parts by weight of a component (B) which is miscible with component (A) and is more polar than component (A), at least one of (A) and (B) being miscible with the polysiloxane fluid. ## Claims ### Claim 1 A granulated foam control composition comprising: (i) a foam control agent comprising; a polydiorganosiloxane fluid comprising units of the formula where each group R, which may be the same or different, is selected from an alkyl group having 1 to 36 carbon atoms or an aryl group or aralkyl group having up to 36 carbon atoms, the mean number of carbon atoms in the groups R being at least 1.3; a hydrophobic filler dispersed in the polydiorganosiloxane fluid; and optionally an organosilicon resin; and (ii) an additive composition having a melting point of at least 35° C. comprising: 5-50 parts by weight of a glycerol triester (A) which is esterified by carboxylate groups each having 7 to 36 carbon atoms, wherein at least 90% of the hydroxyl groups of the glycerol triester are esterified; and 50-95 parts by weight of a mixture of monoesters and diesters of glycerol (B) which is miscible with component (A) and is more polar than component (A), at least one of (A) and (B) being miscible with the polysiloxane fluid wherein the foam control agent (i) and the additive composition (ii) are supported on a particulate carrier with the proviso that a mixture of (i) and (ii) is deposited onto the particulate carrier in non-aqueous liquid form. ### Claim 2 (depends on 1) A foam control composition according to claim 1, characterized in that the polydiorganosiloxane fluid is a polysiloxane comprising at least 10% diorganosiloxane units of the formula and up to 90% diorganosiloxane units of the formula wherein X denotes a divalent aliphatic organic group bonded to silicon through a carbon atom; Ph denotes an aromatic group; Y denotes an alkyl group having 1 to 4 carbon atoms; and Y′ denotes an aliphatic hydrocarbon group having 1 to 24 carbon atoms with the proviso that the mean number of carbon atoms in the coups R is at least 1.3. ### Claim 3 (depends on 1) A foam control composition according to claim 1, characterized in that the polydiorganosiloxane fluid is a polysiloxane comprising 50-100% diorganosiloxane units of the formula and optionally up to 50% diorganosiloxane units of the formula wherein Y denotes an alkyl group having 1 to 4 carbon atoms and Z denotes an alkyl group having 6 to 18 carbon atoms. ### Claim 4 (depends on 1) A foam control composition according to claim 1, characterized in that (A) is a glycerol triester esterified by carboxylate groups each having 14 to 22 carbon atoms. ### Claim 5 (depends on 1) A foam control composition according to claim 1, characterized in that (B) is a mixture of mono-esters and di-esters of glycerol having 8 to 30 carbon atoms. ### Claim 6 (depends on 5) A foam control composition according to claim 5, characterized in that the additive composition comprises 10-50 pans by weight glycerol tristearate and 50-90 pans by weight glycerol monostearate and glycerol distearate. ### Claim 7 (depends on 1) A foam control composition according to claim 1, characterized in that the organosilicon resin is a siloxane resin consisting of monovalent trihydrocarbonsiloxy (M) groups of the formula R″3SiO1/2 and tetrafunctional (Q) groups SiO4/2 wherein R″ denotes an alkyl group and the number ratio of M groups to Q groups is in the range 0.4:1 to 1.1:1. ### Claim 8 (depends on 1) A foam control composition according to claim 1, characterized in that the hydrophobic filler has an average particle size of from 0.5 to 30 μm. ### Claim 9 (depends on 1) A foam control composition according to claim 1, characterized in that the additive composition is present at 20-200% by weight based on the polysiloxane fluid. ### Claim 10 (depends on 1) A granulated foam control agent according to claim 1, characterized in that a water-soluble or water-dispersible binder is also supported on the particulate earner. ### Claim 11 A method of manufacturing a granulated foam control composition comprising: mixing: (i) a foam control agent comprising: a polydiorganosiloxane fluid comprising units of the formula where each group R, which may be the same or different, is selected from an alkyl group having 1 to 36 carbon atoms or an aryl group or aralkyl group having up to 36 carbon atoms, the mean number of carbon atoms in the groups R being at least 1.3; a hydrophobic filler dispersed hi the polydiorganosiloxane fluid; and optionally an organosilicon resin; and (ii) an additive composition having a melting point of at least 35° C. comprising: 5-50 pans by weight of a glycerol triester (A) which esterified by carboxylate groups each having 7 to 36 carbon atoms, wherein at least 90% of the hydroxyl groups of the glycerol triester are esterified; and 50-95 parts by weight of a mixture of monoesrers and diesters of glycerol (B) which is miscible with component (A) and is more polar than component (A), at least one of (A) and (B) being miscible with the polysiloxane fluid; and depositing the mixture of (I) and (ii) on a particulate carrier with the proviso that the mixture of (i) and (ii) is in non-aqueous liquid form prior to depositing it onto the particulate cater. ### Claim 12 (depends on 11) A method according to claim 11, wherein the glycerol triester (A) is a glycerol triester esterified by carboxylate around each having 14 to 22 carbon atoms. ### Claim 13 (depends on 12) A method according to claim 12, wherein component (B) is a mixture of mono-esters and di-esters of having 8 to 30 carbon atoms.