US4684677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermosetting fluorocarbon polymer primers
Assignee: DeSoto Inc
•
Filing: 1986-02-13
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Granted: 1987-08-04
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Expires: 2006-02-13
Abstract
Abstract Rapid air drying thermosetting solvent solution primer compositions are disclosed which comprise volatile polar organic solvent having dissolved therein a fluorocarbon polymer in an amount of from 20% to 45% of total resin solids, a solvent-soluble, hydroxy-functional copolymer of monoethylenically unsaturated monomers containing from 5% to 30% of hydroxy-functional monoethylenic monomer in an amount of from 0.7 to 1.5 parts of hydroxy-functional copolymer per part of fluorocarbon resin, a resinous polyepoxide in an amount providing from 0.1 to 0.6 part of polyepoxide per part of hydroxy-functional copolymer, and a curing agent reactive with hydroxy functionality, preferably an aminoplast resin, for curing the hydroxy-functional acrylic copolymer and the polyepoxide. The primer is pigmented with inorganic pigment in a weight ratio with respect to the resin solids of from 0.2:1 to 0.8:1.
Inventors
- 👤 Clark A. Higginbotham
- 👤 James W. Wichmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:57
CPC Classifications
C; C09; C09D; C09D127/00; C09D127/02; C09D127/12; C09D127/16; C08; C08L; C08L33/00; C08L33/04; C08L33/06; C08L61/00; C08L61/20; C08L63/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
126 words
A rapid air drying thermosetting solvent solution primer composition comprising volatile polar organic solvent having dissolved therein a fluorocarbon polymer in an amount of from 20% to 45% of total resin solids, a solvent-soluble, hydroxy-functional copolymer of monoethylenically unsaturated monomers containing from 5% to 30% of hydroxy-functional monoethylenic monomer in an amount of from 0.7 to 1.5 parts of hydroxy-functional copolymer per part of said fluorocarbon resin, a resinous polyepoxide in an amount providing from 0.1 to 0.6 part of polyepoxide per part of said hydroxy-functional copolymer, and a curing agent reactive with hydroxy functionality for curing said hydroxy-functional acrylic copolymer and said polyepoxide, said primer being pigmented with inorganic pigment in a weight ratio with respect to the resin solids of from 0.2:1 to 0.8:1.
Claim 2
Dependent Claim
126 words
A rapid air drying thermosetting solvent solution primer composition comprising volatile polar organic solvent having dissolved therein a fluorocarbon polymer in an amount of from 20% to 45% of total resin solids, a solvent-soluble, hydroxy-functional copolymer of monoethylenically unsaturated monomers containing from 5% to 30% of hydroxy-functional monoethylenic monomer in an amount of from 0.7 to 1.5 parts of hydroxy-functional copolymer per part of said fluorocarbon resin, a resinous polyepoxide in an amount providing from 0.1 to 0.6 part of polyepoxide per part of said hydroxy-functional copolymer, and a curing agent reactive with hydroxy functionality for curing said hydroxy-functional acrylic copolymer and said polyepoxide, said primer being pigmented with inorganic pigment in a weight ratio with respect to the resin solids of from 0.2:1 to 0.8:1.
Claim 3
Dependent Claim
33 words
A primer as recited in claim 1 in which said composition is in a package with said pigment stably suspended, and said composition has a resin solids content of at least about 40%.
Claim 4
Dependent Claim
45 words
A primer as recited in claim 2 in which said curing agent is an aminoplast resin, the resin solids content is in the range of 42% to 55%, and the pigment to resin solids weight ratio is in the range of from 0.3:1 to 0.5:1.
Claim 5
Dependent Claim
26 words
A primer as recited in claim 3 in which said fluorocarbon polymer is present in an amount of from 30% to 38% of total resin solids.
Claim 6
Dependent Claim
25 words
A primer as recited in claim 1 in which said hydroxy-functional monomer is present in an amount of from 10% to 20% of the copolymer.
Claim 7
Dependent Claim
15 words
A primer as recited in claim 5 in which said hydroxy-functional monomer is 2-hydroxyethyl methacrylate.
Claim 8
Dependent Claim
15 words
A primer as recited in claim 1 in which said fluorocarbon polymer is polyvinylidene fluoride.
Claim 9
Dependent Claim
15 words
A primer as recited in claim 1 in which said solvent comprises dipropylene glycol acetate.
Claim 10
Dependent Claim
36 words
A primer as recited in claim 1 in which said copolymer consists of acrylic monomers and said hydroxy monomer is an hydroxyalkyl acrylate or methacrylate containing from 2 to 4 carbon atoms in the alkyl group.
Claim 11
Dependent Claim
18 words
A primer as recited in claim 9 in which said copolymer comprises at least 50% of methyl methacrylate.
Claim 12
Dependent Claim
58 words
A primer as recited in claim 1 in which said curing agent is an aminoplast resin and said resinous polyepoxide is a diglycidyl ether of a bisphenol having a molecular weight in the range of 350 to 800 and is present in an amount providing from 0.2 to 0.4 part of polyepoxide per part of said hydroxy-functional copolymer.
Claim 13
Dependent Claim
21 words
A primer as recited in claim 11 in which said diglycidyl ether has a molecular weight of from 370 to 500.
Claim 14
Dependent Claim
42 words
A primer as recited in claim 3 in which said aminoplast resin is a polyalkoxymethyl melamine resin containing from 1 to 4 carbon atoms in the alkoxyl group and present in an amount of from 5% to 25% of total resin solids.
Claim 15
Dependent Claim
27 words
A primer as recited in claim 13 in which said polyalkoxymethyl melamine resin is present in an amount of from 7% to 20% of total resin solids.
Claim 16
Dependent Claim
22 words
A primer as recited in claim 1 in which said inorganic pigment is a mixture of titanium dioxide and a chromate pigment.
Claim 17
Dependent Claim
28 words
A primer as recited in claim 1 in which said titanium dioxide is present in an amount of from 5 to 15 parts per part of chromate pigment.
Claim 18
Dependent Claim
23 words
A primer as recited in claim 1 having a viscosity suited to spray application and having a resin solids content of about 28%.
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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) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |