US4469836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perfluorocarbon based polymeric coatings having low critical surface tensions
Assignee: Dow Chemical Co
•
Filing: 1983-10-04
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Granted: 1984-09-04
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Expires: 2003-10-04
Abstract
Abstract Highly adherent release compositions having very low surface tensions comprise a polymer containing a pendant benzyl portion linked through a benzyl ester linkage to a perfluorocarbon moiety. Such compositions will not wet with any common solvents. Such compositions are most advantageously employed as release coatings on internal surfaces of molding apparatus.
Inventors
- 👤 Donald L. Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:21
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/34
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
94 words
An adherent coating composition comprising a polymer containing a pendant benzyl portion linked through a benzyl ester linkage containing a hydrocarbon moiety containing at least two carbon atoms to a perfluorocarbon moiety having a perfluoroalkyl group, represented by the formula: ##STR7## wherein A is hydrogen or methyl, Y 1 is a hydrocarbon moiety containing at least 2 carbon atoms, L is a non-interfering radical, d is 0 or 1, and R F is a saturated perfluoroaliphatic moiety, and wherein the coating exhibits a critical surface tension of wetting of less than about 15 dynes/cm.
Claim 2
Dependent Claim
94 words
An adherent coating composition comprising a polymer containing a pendant benzyl portion linked through a benzyl ester linkage containing a hydrocarbon moiety containing at least two carbon atoms to a perfluorocarbon moiety having a perfluoroalkyl group, represented by the formula: ##STR7## wherein A is hydrogen or methyl, Y 1 is a hydrocarbon moiety containing at least 2 carbon atoms, L is a non-interfering radical, d is 0 or 1, and R F is a saturated perfluoroaliphatic moiety, and wherein the coating exhibits a critical surface tension of wetting of less than about 15 dynes/cm.
Claim 3
Dependent Claim
73 words
An adherent coating composition of claim 1 represented by the formula ##STR8## wherein a+b+c=1, a is greater than 0, b is from about 0 to about 0.9, c is from 0 to about 0.8, m is from about 100 to about 10,000, X is an essentially nonionic moiety and Y is the remaining portion of a polycarboxylic acid and is present in such a way that crosslinking is introduced to the polymer system.
Claim 4
Dependent Claim
11 words
An adherent coating composition of claim 2 wherein b=0 and c=0.
Claim 5
Dependent Claim
9 words
An adherent coating composition of claim 2 wherein b=0.
Claim 6
Dependent Claim
32 words
An adherent coating composition of claim 1 comprising a polymer having repeating units of the formula ##STR9## wherein A is hydrogen or methyl, and x is from about 3 to about 18.
Claim 7
Dependent Claim
31 words
A composition comprising a polyvinylbenzyl sulfonium containing polymer, a nucleophilic fluoroalkyl-containing carboxylic acid, and a suitable solvent, such that when cured, said composition yields an adherent coating composition of claim 1.
Claim 8
Dependent Claim
35 words
A composition comprising a polyvinylbenzyl sulfonium containing polymer, a nucleophilic fluoroalkyl-containing carboxylic acid, a polyfunctional carboxylic acid, and a suitable solvent, such that when cured, said composition yields an adherent coating composition of claim 2.
Claim 9
Dependent Claim
27 words
A composition of claim 6 wherein said suitable solvent is diethylene glycol methyl ether, or a mixture of diethylene glycol methyl ether and propylene glycol methyl ether.
Claim 10
Dependent Claim
22 words
A coated substrate wherein the coating for the substrate results from contacting the composition of claim 6 with said substrate and curing.
Claim 11
Dependent Claim
20 words
A coated substrate wherein the coating for the substrate results from contacting the composition of claim 1 with said substrate.
Claim 12
Dependent Claim
53 words
A process for reducing the amount of sticking of material on the internal surfaces of a molding apparatus which comprises applying a solution of the composition of claim 6 to said surfaces and curing such that the resulting adherent nonreactive coating has a critical surface tension of wetting less than about 15 dynes/cm.
Claim 13
Dependent Claim
53 words
A process for reducing the amount of sticking of material on the internal surfaces of a molding apparatus which comprises applying a solution of the composition of claim 7 to said surfaces and curing such that the resulting adherent nonreactive coating has a critical surface tension of wetting less than about 15 dynes/cm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |