Patent US4248744A successfully refreshed from Google Patents.
US4248744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermosetting powders
Assignee: BASF Corp
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Filing: 1979-08-20
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Granted: 1981-02-03
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Expires: 1999-08-20
Abstract
Abstract Thermosetting powders, suitable for application by electrostatic spraying, onto conductive surfaces to form decorative and protective coatings. The powders contain, as essential ingredients, crosslinkable acrylic polymer, or polymers, a polyisocyanate as a crosslinking agent, and sucrose benzoate.
Inventors
- 👤 Edward J. Masar
- 👤 David J. Oberg
- 👤 Ralph A. Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:37
CPC Classifications
C; C09; C09D; C09D133/00; C09D133/04; C09D133/06; C09D133/10; C08; C08L; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
184 words
A powder suitable for application by electrostatic powder spray gun to conductive surfaces, said powder being comprised of a mixture of (A) an acrylic polymer (B) a blocked polyisocyanate, and (C) 2 to 15% by weight, based on film forming solids, of sucrose benzoate, said acrylic polymer being a copolymer of a mixture of (a) 0 to 25% by weight, of a monomer of the group consisting of styrene, α-methyl styrene and vinyl toluene, (b) 3 to 25% by weight of an active hydrogen containing monoethylenically unsaturated compound of the formula ##STR2## where R is hydrogen or methyl and R 1 is an alkylene radical containing 2 to 4 carbon atoms, (c) 45 to 97% by weight of a lower alkyl ester of methacrylic acid and (d) 0 to 30% by weight of a lower alkyl ester of acrylic acid, said acrylic resin being further characterized as having a glass transition temperature between 45° C. and 95° C., and wherein the ratio of (A) and (B) is substantially 1:1 on the basis of equivalents of hydroxyl groups in (A) to isocyanate groups in (B).
Claim 2
Dependent Claim
184 words
A powder suitable for application by electrostatic powder spray gun to conductive surfaces, said powder being comprised of a mixture of (A) an acrylic polymer (B) a blocked polyisocyanate, and (C) 2 to 15% by weight, based on film forming solids, of sucrose benzoate, said acrylic polymer being a copolymer of a mixture of (a) 0 to 25% by weight, of a monomer of the group consisting of styrene, α-methyl styrene and vinyl toluene, (b) 3 to 25% by weight of an active hydrogen containing monoethylenically unsaturated compound of the formula ##STR2## where R is hydrogen or methyl and R 1 is an alkylene radical containing 2 to 4 carbon atoms, (c) 45 to 97% by weight of a lower alkyl ester of methacrylic acid and (d) 0 to 30% by weight of a lower alkyl ester of acrylic acid, said acrylic resin being further characterized as having a glass transition temperature between 45° C. and 95° C., and wherein the ratio of (A) and (B) is substantially 1:1 on the basis of equivalents of hydroxyl groups in (A) to isocyanate groups in (B).
Claim 3
Dependent Claim
14 words
A powder as in claim 1 wherein the blocked polyisocyanate is a blocked diisocyanate.
Claim 4
Dependent Claim
15 words
A powder as in claim 1 which contains 1 to 50% by weight of pigment.
Claim 5
Dependent Claim
18 words
A powder as in claim 2 wherein the blocked polyisocyanate is decomposable at 250° F. to 350° F.
Claim 6
Dependent Claim
13 words
A powder as in claim 2 wherein the polyisocyanate is blocked with caprolactam.
Claim 7
Dependent Claim
27 words
A powder as in claim 2 wherein the acrylic resin is a copolymer of 30% methyl methacrylate, 30% isobutyl methacrylate, 25% butyl methacrylate and 15% hydroxyethyl methacrylate.
Claim 8
Dependent Claim
26 words
A powder as in claim 2 wherein the powder is prepared by spray drying a volatile solvent solution of the blocked polyisocyanate and the acrylic polymer.
Claim 9
Dependent Claim
12 words
A powder as in claim 7 wherein the solvent is methylene chloride.
Claim 10
Dependent Claim
26 words
A powder as in claim 2 wherein the acrylic polymer is a copolymer of 30% styrene, 30% isobutyl methacrylate, 25% butyl methacrylate and 15% hydroxyethyl methacrylate.
Claim 11
Dependent Claim
12 words
A powder as in claim 2 wherein the polyisocyanate is isophorone diisocyanate.
Claim 12
Dependent Claim
23 words
A powder as in claim 2 wherein the amount of sucrose benzoate is 5 to 15% by weight, based on film forming solids.
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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) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |