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US4562223A
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Defoaming agent for plastic dispersions and disperse coating materials and its preparation
Assignee: Bayer AG
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Filing: 1983-08-04
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Granted: 1985-12-31
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Expires: 2003-08-04
Abstract
Abstract A dispersion comprising a solvent having dispersed therein a plastic and a defoaming agent comprising by weight approximately (a) 80 to 100% by weight of a polyoxyalkylenesiloxane copolymer of the formula [R.sup.1 Si(OSiR.sub.2).sub.n ].sub.m Z.sub.m-1 (OR.sup.2).sub.m+2 in which R represents an optionally halogen-substituted alkyl group with up to 4 C atoms, R 1 represents the substituent R or a phenyl radical, R 2 represents a group of the composition ##STR1## Z represents the difunctional unit --O-- or ##STR2## and R 3 denotes a hydrocarbon radical with up to 6 C atoms, R 4 denotes independently of one another hydrogen or R 3 , n denotes a number between 3 and 40, m denotes a number between 1 and 15, x denotes a number between 0 and 68, y denotes a number between 0 and 52, x+y denotes a number between 1 and 68 and (b) 0-20% by weight of a hydrophobic silicon dioxide, whereby substantially bubble-free films can readily be prepared therefrom.
Inventors
- 👤 Helmut Steinberger
- 👤 Werner Clarenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:24
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/42; C08G77/46; B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; B01D19/0409
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
183 words
In a dispersion comprising a solvent, a plastic, a defoaming agent, a pigment, a pigment wetting agent and a thickening agent, the improvement which comprises employing as said defoaming agent (a) 80 to 100% by weight of polyoxyalkylenesiloxane copolymer of the formula: [R.sup.1 Si(OSiR.sub.2).sub.n ].sub.m Z.sub.m-1 (OR.sup.2).sub.m+2, in which R represents an optionally halogen-substituted alkyl group with up to 4 C atoms, R 1 represents the substituted R or a phenyl radical, R 2 represents a group of the composition ##STR10## Z represents the difunctional unit --O-- or ##STR11## and R 3 denotes a hydrocarbon radical with up to 6 C atoms, R 4 denotes independently of one another hydrogen or R 3 , n denotes a number between 3 and 40, m denotes a number between 1 and 15, x denotes a number between 0 and 68, y denotes a number between 0 and 52, x+y denotes a number between 1 and 68 and p denotes a number between 2 and 12, and (b) 6 to 10% by weight of a hydrophobic silicon dioxide, and employing an acrylate polymer as the plastic.
Claim 2
Dependent Claim
183 words
In a dispersion comprising a solvent, a plastic, a defoaming agent, a pigment, a pigment wetting agent and a thickening agent, the improvement which comprises employing as said defoaming agent (a) 80 to 100% by weight of polyoxyalkylenesiloxane copolymer of the formula: [R.sup.1 Si(OSiR.sub.2).sub.n ].sub.m Z.sub.m-1 (OR.sup.2).sub.m+2, in which R represents an optionally halogen-substituted alkyl group with up to 4 C atoms, R 1 represents the substituted R or a phenyl radical, R 2 represents a group of the composition ##STR10## Z represents the difunctional unit --O-- or ##STR11## and R 3 denotes a hydrocarbon radical with up to 6 C atoms, R 4 denotes independently of one another hydrogen or R 3 , n denotes a number between 3 and 40, m denotes a number between 1 and 15, x denotes a number between 0 and 68, y denotes a number between 0 and 52, x+y denotes a number between 1 and 68 and p denotes a number between 2 and 12, and (b) 6 to 10% by weight of a hydrophobic silicon dioxide, and employing an acrylate polymer as the plastic.
Claim 3
Dependent Claim
190 words
In the coating of a substrate with a plastic by applying the substrate a dispersion comprising a solvent, a plastic, a defoaming agent and a thickening agent, and allowing the applied dispersion to dry, the improvement which comprises employing as said defoaming agent [R.sup.1 Si(OSiR.sub.2).sub.n ].sub.m Z.sub.m-1 (OR.sup.2).sub.m+2, in which R represents an optionally halogen-substituted alkyl group with up to 4 C atoms, R 1 represents the substituted R or a phenyl radical, R 2 represents a group of the composition ##STR12## Z represents the difunctional unit --O-- or ##STR13## and R 3 denotes a hydrocarbon radical with up to 6 C atoms, R 4 denotes independently of one another hydrogen or R 3 , n denotes a number between 3 and 40, m denotes a number between 1 and 15, x denotes a number between 0 and 68, y denotes a number between 0 and 52, x+y denotes a number between 1 and 68 and p denotes a number between 2 and 12, and (b) 0-20% by weight of a hydrophobic silicon dioxide, and employing an acrylate polymer as the plastic, whereby the coating upon drying is substantially bubble-free.
Claim 4
Dependent Claim
190 words
In the coating of a substrate with a plastic by applying the substrate a dispersion comprising a solvent, a plastic, a defoaming agent and a thickening agent, and allowing the applied dispersion to dry, the improvement which comprises employing as said defoaming agent [R.sup.1 Si(OSiR.sub.2).sub.n ].sub.m Z.sub.m-1 (OR.sup.2).sub.m+2, in which R represents an optionally halogen-substituted alkyl group with up to 4 C atoms, R 1 represents the substituted R or a phenyl radical, R 2 represents a group of the composition ##STR12## Z represents the difunctional unit --O-- or ##STR13## and R 3 denotes a hydrocarbon radical with up to 6 C atoms, R 4 denotes independently of one another hydrogen or R 3 , n denotes a number between 3 and 40, m denotes a number between 1 and 15, x denotes a number between 0 and 68, y denotes a number between 0 and 52, x+y denotes a number between 1 and 68 and p denotes a number between 2 and 12, and (b) 0-20% by weight of a hydrophobic silicon dioxide, and employing an acrylate polymer as the plastic, whereby the coating upon drying is substantially bubble-free.
Claim 5
Dependent Claim
24 words
A process according to claim 2, wherein the hydrophobic silicon dioxide is present in about 6 to 10% by weight of the defoaming agent.
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) | 1988-12-30 | 1989-07-01 | 1989-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-30 | 1993-07-01 | 1993-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-30 | 1997-07-01 | 1997-12-31 | $7700.00 | Window Closed / Lapsed |