US4900474A
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Silicone antifoamers
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1988-07-15
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Granted: 1990-02-13
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Expires: 2008-07-15
Abstract
Abstract An antifoamer which comprises a polyperfluoroether group-containing organopolysiloxane comprising from 20 to 100 mole % of the polyperfluoroether group-containing organopolysiloxane units of a specific type is described. The content of fluorine atoms in the polyperfluoroether group-containing organopolysiloxane is in the range of from 20 to 70 wt % by which foams of organic solvent systems can be inhibited to a substantial extent.
Inventors
- 👤 Nobuyuki Terae
- 👤 Teiichi Mutoh
- 👤 Akira Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:27
CPC Classifications
B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; B01D19/0409
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
244 words
An antifoamer which comprises a polyperfluoroether group-containing organopolysiloxane comprising from 20 to 100 mole % of the polyperfluoroether group-containing organosiloxane units of the following formula (1) ##STR21## wherein Q represents a divalent organic group having from 1 to 40 carbon atoms and is ##STR22## wherein R 3 , R 4 and R 5 independently represent a divalent hydrocarbon group having from 1 to 10 carbon atoms, a and b are independently an integer of from 1 to 5, p and q are independently an integer of from 1 to 10, and r and t are independently an integer of from 2 to 5, R 1 is selected from the group consisting of a hydrogen atom, an unsubstituted monovalent hydrocarbon group having from 1 to 8 carbon atoms, a substituted monovalent hydrocarbon group having from 1 to 8 carbon atoms in which part or all of the hydrogen atoms bonded to the carbon atoms are substituted with a halogen atom, a cyano group, a chloromethyl group, a 3,3,3-trifluoropropyl group or a 2-cyanoethyl group, and a --OX group in which X represents a hydrogen atom or a monovalent hydrocarbon group having from 1 to 8 carbon atoms, m is an integer of from 1 to 14, n is an integer of 1 to 10, and x and y are 0<x≦3 and 0≦y≦3 provided that 0<x+y≦3, the content of fluorine atoms in the polyperfluoroether group-containing organopolysiloxane being in the range of from 20 to 70% by weight.
Claim 2
Dependent Claim
244 words
An antifoamer which comprises a polyperfluoroether group-containing organopolysiloxane comprising from 20 to 100 mole % of the polyperfluoroether group-containing organosiloxane units of the following formula (1) ##STR21## wherein Q represents a divalent organic group having from 1 to 40 carbon atoms and is ##STR22## wherein R 3 , R 4 and R 5 independently represent a divalent hydrocarbon group having from 1 to 10 carbon atoms, a and b are independently an integer of from 1 to 5, p and q are independently an integer of from 1 to 10, and r and t are independently an integer of from 2 to 5, R 1 is selected from the group consisting of a hydrogen atom, an unsubstituted monovalent hydrocarbon group having from 1 to 8 carbon atoms, a substituted monovalent hydrocarbon group having from 1 to 8 carbon atoms in which part or all of the hydrogen atoms bonded to the carbon atoms are substituted with a halogen atom, a cyano group, a chloromethyl group, a 3,3,3-trifluoropropyl group or a 2-cyanoethyl group, and a --OX group in which X represents a hydrogen atom or a monovalent hydrocarbon group having from 1 to 8 carbon atoms, m is an integer of from 1 to 14, n is an integer of 1 to 10, and x and y are 0<x≦3 and 0≦y≦3 provided that 0<x+y≦3, the content of fluorine atoms in the polyperfluoroether group-containing organopolysiloxane being in the range of from 20 to 70% by weight.
Claim 3
Dependent Claim
29 words
The antifoamer according to claim 1, wherein said polyperfluoroether group-containing organosiloxane units are contained in said polyperfluoroether group-containing organopolysiloxane in an amount of from 30 to 70 mole %.
Claim 4
Dependent Claim
28 words
The antifoamer according to claim 1, wherein the content of fluorine atoms in the polyperfluoroether group-containing organopolysiloxane is in the range of from 30 to 60% by weight.
Claim 5
Dependent Claim
96 words
The antifoamer according to claim 1, wherein said polyperfluoroether group-containing organopolysiloxane further comprises siloxane units of the following general formula (2) ##STR23## in which R 2 is selected from the group consisting of a hydrogen atom, or unsubstituted monovalent hydrocarbon group having from 1 to 8 carbon atoms and a substituted monovalent hydrocarbon group having from 1 to 8 carbon atoms in which part or all of the hydrocarbon atoms bonded to the carbon atoms are substituted with a halogen atom, a cyano group, a chloromethyl group, a 3,3,3-trifluoropropyl group or a 2-cyanoethyl group, and 0<z≦3.
Claim 6
Dependent Claim
21 words
The antifoamer according to claim 4, wherein said siloxane units are contained in an amount of up to 80 mole %.
Claim 7
Dependent Claim
40 words
The antifoamer according to claim 1, wherein said polyperfluoroether group-containing organopolysiloxane is dissolved in an insert organic solvent selected from the group consisting of a ketone or a halogen-containing compound in an amount of from 2 to 50% by weight.
Claim 8
Dependent Claim
15 words
The antifoamer according to claim 1, further comprising finely powdered silica serving to break foams.
Claim 9
Dependent Claim
47 words
The antifoamer according to claim 1, wherein said unsubstituted monovalent hydrocarbon group of R 1 and substituted monovalent hydrocarbon group of R 1 are each selected from the group consisting of an alkyl group, a cycloalkyl group, an alkenyl group, an aryl group and an aralkyl group.
Claim 10
Dependent Claim
65 words
The antifoamer according to claim 1, wherein said unsubstituted monovalent hydrocarbon group of R 1 and substituted monovalent hydrocarbon group of R 1 are each selected from the group consisting of a methyl group, an ethyl group, a propyl group, a butyl group, an octyl group, a cyclohexyl group, a vinyl group, an allyl group, a phenyl group, a tolyl group and a 2-phenylethyl group.
Claim 11
Dependent Claim
47 words
The antifoamer according to claim 4, wherein said unsubstituted monovalent hydrocarbon group of R 2 and substituted monovalent hydrocarbon group of R 2 are each selected from the group consisting of an alkyl group, a cycloalkyl group, an alkenyl group, an aryl group and an aralkyl group.
Claim 12
Dependent Claim
65 words
The antifoamer according to claim 4, wherein said unsubstituted monovalent hydrocarbon group of R 2 and substituted monovalent hydrocarbon group of R 2 are each selected from the group consisting of a methyl group, an ethyl group, a propyl group, a butyl group, an octyl group, a cyclohexyl group, a vinyl group, an allyl group, a phenyl group, a tolyl group and a 2-phenylethyl group.
Claim 13
Dependent Claim
31 words
The antifoamer according to claim 1, in which R 3 , R 4 and R 5 are each selected from the group consisting of an alkylene group and a phenylene group.
Claim 14
Dependent Claim
31 words
The antifoamer according to claim 1, in which R 3 , R 4 and R 5 are each selected from the group consisting of a methylene group and an ethylene group.
Claim 15
Dependent Claim
30 words
The antifoamer according to claim 6, wherein said organic solvent is selected from the group consisting of methyl ethyl ketone, methyl isobutyl ketone, 1,1,2-trifluoro-1,1,2-trichloroethane, hexafluoroxylene, hexafluoropropylene oligomers, 1,1,3-trichloroethane and 1,1,2,2-tetrachloroethylene.
Claim 16
Dependent Claim
30 words
The antifoamer composition according to claim 7, wherein the silica is present in an amount of less than 20 parts by weight, to 100 parts by weight of the organopolysiloxane.
Claim 17
Dependent Claim
30 words
The antifoamer composition according to claim 7, wherein the silica is present in an amount of less than 15 parts by weight, to 100 parts by weight of the organopolysiloxane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |