Foam control composition
View Patent ↗This invention relates to a foam control composition comprising: (A) a silicone antifoam comprising (i) an organopolysiloxane having at least one silicon-bonded substituent of the formula X—Ar, wherein X represents a divalent aliphatic group bonded to silicon through a carbon atom and Ar represents an aromatic group, (ii) an organosilicon resin having the formula R 1 a SiO (4-a)/2 where R 1 represents a hydrocarbon, a hydrocarbonoxy or a hydroxyl group and a has an average value of 0.5 to 2.4, and (iii) a hydrophobic filler; and (B) an organopolysiloxane resin having at least one polyoxyalkylene group in which the organopolysiloxane resin comprises tetrafunctional siloxane units having the formula SiO 4/2 and monofunctional siloxane units having the formula R 2 3 SiO 1/2 , wherein the total number of tetrafunctional siloxane units in the resin is at least 50% based on the total number of siloxane units, and R 2 represents a hydrocarbon group. The foam control composition may be added to a potentially foaming liquid, particularly a detergent, such as an HDL detergent.
1. A foam control composition comprising: (A) a silicone antifoam comprising (i) an organopolysiloxane having at least one silicon-bonded substituent of the formula X—Ar, wherein X represents a divalent aliphatic group bonded to silicon through a carbon atom and Ar represents an aromatic group, (ii) an organosilicon resin having the formula R 1 a SiO (4-a)/2 where R 1 represents a hydrocarbon, a hydrocarbonoxy or a hydroxyl group and a has an average value of 0.5 to 2.4, and (iii) a hydrophobic filler; and (B) an organopolysiloxane resin having at least one polyoxyalkylene group in which the organopolysiloxane resin comprises tetrafunctional siloxane units having the formula SiO 4/2 and monofunctional siloxane units having the formula R 2 3 SiO 1/2 , wherein the total number of tetrafunctional siloxane units in the resin is at least 50% based on the total number of siloxane units, and R 2 represents a hydrocarbon group.
2. A foam control composition as claimed in claim 1 further comprising (C) a cross-linked organopolysiloxane polymer having at least one polyoxyalkylene group, in which the cross-linked organopolysiloxane polymer comprises difunctional siloxane units having the formula R 3 2 SiO 2/2 , wherein the total number of difunctional siloxane units is at least 60% based on the total number of siloxane units, and R 3 represents a hydrocarbon group.
3. A foam control composition as claimed in claim 1 , further comprising (D) an organic oil.
4. A foam control composition as claimed in claim 1 , wherein the total number of tetrafunctional siloxane units in the organopolysiloxane resin (B) is at least 70% based on the total number of siloxane units.
5. A foam control composition as claimed in claim 1 , wherein the ratio of tetrafunctional siloxane units to monofunctional siloxane units in the organopolysiloxane resin (B) is 1:0.4-1.2.
6. A foam control composition as claimed in claim 2 , wherein the total number of difunctional siloxane units in the cross-linked organopolysiloxane polymer (C) is at least 70% based on the total number of siloxane units.
7. A method of using the foam control composition as claimed in claim 1 for reducing or eliminating foam formation in a liquid.
8. A liquid detergent comprising one or more surfactants, water and the foam control composition as claimed in claim 1 .
9. A liquid detergent as claimed in claim 8 , wherein the detergent is an HDL detergent.
10. A liquid detergent as claimed in claim 8 , wherein the foam control composition is present at 0.01-0.5% by weight based on the total weight of the detergent.
11. A foam control composition as claimed in claim 2 , further comprising (D) an organic oil.
12. A foam control composition as claimed in claim 3 comprising 10-50% by weight of component (A), 0.1-5% by weight of component (B), and 40-90% by weight of component (D), based on the total weight of the foam control composition.
13. A foam control composition as claimed in claim 2 , wherein the total number of tetrafunctional siloxane units in the organopolysiloxane resin (B) is at least 70% based on the total number of siloxane units.
14. A foam control composition as claimed in claim 2 , wherein the ratio of tetrafunctional siloxane units to monofunctional siloxane units in the organopolysiloxane resin (B) is 1:0.4-1.2.
15. A method of using the foam control composition as claimed in claim 2 for reducing or eliminating foam formation in a liquid.
16. A method of using the foam control composition as claimed in claim 3 for reducing or eliminating foam formation in a liquid.
17. A liquid detergent comprising one or more surfactants, water and the foam control composition as claimed in claim 2 .
18. A liquid detergent comprising one or more surfactants, water and the foam control composition as claimed in claim 3 .
19. A liquid detergent as claimed in claim 17 , wherein the foam control composition is present at 0.01-0.5% by weight based on the total weight of the detergent.
20. A foam control composition as claimed in claim 11 comprising 10-50% by weight of component (A), 0.1-5% by weight of component (B), 0.1-5% by weight of component (C) and 40-90% by weight of component (D), based on the total weight of the foam control composition.