Patent US3280276A successfully refreshed from Google Patents.
Patent US4028218A successfully refreshed from Google Patents.
US4028218A
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US
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Defoaming composition and method of defoaming aqueous solutions or dispersions
Assignee: Evonik Operations GmbH
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Filing: 1974-10-18
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Granted: 1977-06-07
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Expires: 1994-10-18
Abstract
Abstract In the disclosed method of preventing the formation of foam and destroying existing foam in an aqueous solution or dispersion, an effective amount of a composition comprising about 0.2 to 7.5 percent by weight of highly disperse silica or alumina with the balance being methylpolysiloxanepolyoxyalkylene mixed block polymer consisting essentially of A. about 10-60 percent by weight of methylpolysiloxane; B. with the balance polyoxyalkylene, > 80-100 percent by weight of the polyoxyalkylene block consisting of oxypropylene units, Is added to the solution or dispersion. The application also discloses defoaming preparations or compositions of finely disperse silica or alumina and methylpolysiloxane-polyoxyalkylene mixed block polymer which may be diluted in oily substances. The preparation may optionally comprise non-ionogenic emulsifier of an HLB value of 8 to 14.
Inventors
- 👤 Hans-Ferdi Fink
- 👤 Herwig Fritsch
- 👤 Gotz Koerner
- 👤 Gerd Rossmy
- 👤 Gunter Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:27
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/10; C08L83/12; B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; B01D19/0409; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/34; C08K3/36; C08K5/00; C08K5/04; C08K5/06; C08K5/10; C08L71/00; D; D06; D06L; D06L4/00; D06L4/20; D06L4/22; D06L4/24; D06L4/26; D06P; D06P1/00; D06P1/44; D06P1/52; D06P1/5264; D06P1/5292; Y; Y10; Y10S; Y10S8/00; Y10S8/01
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
159 words
In a method for preventing the formation of foam and destroying existing foam in an aqueous solution or dispersion wherein an effective amount of defoaming composition composed of an oil, highly dispersed silica and a defoaming substance of a polyoxyalkylene-polysiloxane block copolymer is used, the improvement which comprises said block copolymer consisting essentially of a. about 10 to 60 % by weight of methylpolysiloxane and b. with the balance polyoxyalkylene, said polyoxyalkylene block consisting of oxypropylene units and said block copolymer having the formula: ##STR3## wherein R is alkyl, acyl, aryl or R'--NH--CO--, wherein R' stands for aryl or alkyl, a and n have finite values and the absolute values for n, a and b are the corollary of conditions (a) and (b); or the formula ##STR4## wherein R is alkyl, acyl, aryl or R'--NH--CO--, wherein R' is alkyl or aryl, c≧1, and the absolute values for n, c, and d are the corollary of conditions (a) and (b).
Claim 2
Dependent Claim
159 words
In a method for preventing the formation of foam and destroying existing foam in an aqueous solution or dispersion wherein an effective amount of defoaming composition composed of an oil, highly dispersed silica and a defoaming substance of a polyoxyalkylene-polysiloxane block copolymer is used, the improvement which comprises said block copolymer consisting essentially of a. about 10 to 60 % by weight of methylpolysiloxane and b. with the balance polyoxyalkylene, said polyoxyalkylene block consisting of oxypropylene units and said block copolymer having the formula: ##STR3## wherein R is alkyl, acyl, aryl or R'--NH--CO--, wherein R' stands for aryl or alkyl, a and n have finite values and the absolute values for n, a and b are the corollary of conditions (a) and (b); or the formula ##STR4## wherein R is alkyl, acyl, aryl or R'--NH--CO--, wherein R' is alkyl or aryl, c≧1, and the absolute values for n, c, and d are the corollary of conditions (a) and (b).
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein the weight ratio of oil to block copolymer is 1 : 100.
Claim 4
Dependent Claim
42 words
The method of claim 1, wherein the composition additionally comprises 2 to 10 percent by weight, calculated on the total system, of a non-ionogenic emulsifier having an HLB value of 8 to 14, said emulsifier being soluble or dispersible in the system.
Claim 5
Dependent Claim
26 words
The method of claim 1, wherein R is alkyl of 1-4 carbon atoms, acetyl or phenyl and R' is alkyl of 1-4 carbon atoms or phenyl.
Claim 6
Dependent Claim
14 words
The method of claim 1, wherein b and m of formula I are zero.
Claim 7
Dependent Claim
19 words
The method of claim 1, wherein in formula I a = 6, b = 2.1, and n = 30.
Claim 8
Dependent Claim
138 words
In a defoaming composition of the type composed of an oil, highly dispersed silica and a defoaming substance of a polyoxyalkylene-polysiloxane block copolymer, the improvement which comprises said block copolymer consisting essentially of a. about 10 to 60 % by weight of methylpolysiloxane; and b. with the balance of polyoxyalkylene, said polyoxyalkylene block consisting of oxypropylene units and said block copolymer having the formula: ##STR5## wherein R is alkyl, acyl, aryl or R'--NH--CO--, wherein R' stands for aryl or alkyl, a and n finite values and the absolute values for n, a and b are the corollary of conditions (a) and (b); or the formula ##STR6## wherein R is alkyl, acyl, aryl or R'--NH--CO--, wherein R' is alkyl or aryl, c≧1, and the absolute values for n, c, and d are the corollary of conditions (a) and (b).
Claim 9
Dependent Claim
138 words
In a defoaming composition of the type composed of an oil, highly dispersed silica and a defoaming substance of a polyoxyalkylene-polysiloxane block copolymer, the improvement which comprises said block copolymer consisting essentially of a. about 10 to 60 % by weight of methylpolysiloxane; and b. with the balance of polyoxyalkylene, said polyoxyalkylene block consisting of oxypropylene units and said block copolymer having the formula: ##STR5## wherein R is alkyl, acyl, aryl or R'--NH--CO--, wherein R' stands for aryl or alkyl, a and n finite values and the absolute values for n, a and b are the corollary of conditions (a) and (b); or the formula ##STR6## wherein R is alkyl, acyl, aryl or R'--NH--CO--, wherein R' is alkyl or aryl, c≧1, and the absolute values for n, c, and d are the corollary of conditions (a) and (b).
Claim 10
Dependent Claim
17 words
A defoaming composition as claimed in claim 7, wherein b and m of formula I are zero.
Claim 11
Dependent Claim
22 words
A defoaming composition as claimed in claim 7, wherein in formula I, a = 6, b = 2.1, and n = 30.
Claim 12
Dependent Claim
45 words
A defoaming preparation as claimed in claim 7, further comprising 2 to 10 percent by weight calculated on the total weight of the preparation, of a non-ionogenic emulsifier having an HLB value of 8 to 14, said emulsifier being soluble or dispersible in the preparation.
Claim 13
Dependent Claim
29 words
A defoaming preparation as claimed in claim 7, wherein R is alkyl of 1-4 carbon atoms, acetyl or phenyl and R' is alkyl of 1-4 carbon atoms or phenyl.
Claim 14
Dependent Claim
21 words
A defoaming composition as claimed in claim 7, wherein the block polymer comprises 15 to 30 percent by weight of methylpolysiloxane.
Claim 15
Dependent Claim
33 words
A defoaming composition as claimed in claim 7, wherein the siloxane blocks of an average molecule have 10-300 silicon atoms while the molecular weight of polyoxyalkylene blocks is in the range of 750-4500.
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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |