US4442270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermosetting powder coating compositions
Assignee: Eastman Chemical Co
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Filing: 1983-02-08
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Granted: 1984-04-10
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Expires: 2003-02-08
Abstract
Abstract Disclosed are crystalline polyesters having low melt viscosities, and thermosetting compositions comprising these polyesters. The compositions are especially useful as powder coatings. At least 40 mole percent of the acid moiety is a terephthalic or isophthalic acid moiety, and the polyester contains as moieties of the dihydric alcohol about 40-100 mole percent 1,6-hexanediol, the polyester being further characterized as having a molecular weight of about 700-3000, a melt viscosity of about 50-3000 cps at 160° C. and a hydroxyl number of about 30-160.
Inventors
- 👤 David T. Passmore
- 👤 Willis C. Wooten
- 👤 Paul McBride
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:41
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/181; C08G63/20; C09; C09D; C09D167/00; C08G2150/00; C08G2150/20; Y; Y10; Y10S; Y10S524/00; Y10S524/904
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
111 words
A thermosetting composition comprising (a) a linear saturated crystalline polyester of an acid moiety and a moiety of a dihydric alcohol, at least 40 mole percent of the acid moiety being a terephthalic or isophthalic acid moiety, said polyester containing as moieties of the dihydric alcohol at least 40 mole percent 1,6-hexanediol, said polyester being further characterized as having a molecular weight of about 700-3000, a melt viscosity of about 50-3000 cps at 160° C. and a hydroxyl number of about 35-160, and (b) from about 10 to about 40%, based on the weight of said polyester, of a curing agent which is reactive with hydroxyl groups to crosslink said polyester.
Claim 2
Dependent Claim
111 words
A thermosetting composition comprising (a) a linear saturated crystalline polyester of an acid moiety and a moiety of a dihydric alcohol, at least 40 mole percent of the acid moiety being a terephthalic or isophthalic acid moiety, said polyester containing as moieties of the dihydric alcohol at least 40 mole percent 1,6-hexanediol, said polyester being further characterized as having a molecular weight of about 700-3000, a melt viscosity of about 50-3000 cps at 160° C. and a hydroxyl number of about 35-160, and (b) from about 10 to about 40%, based on the weight of said polyester, of a curing agent which is reactive with hydroxyl groups to crosslink said polyester.
Claim 3
Dependent Claim
109 words
A thermosetting composition comprising (a) a linear saturated crystalline polyester of an acid moiety and a moiety of a dihydric alcohol, at least 40 mole percent of the acid moiety being a terephthalic acid moiety, said polyester containing as moieties of the dihydric alcohol at least 40 mole percent 1,6-hexanediol, said polyester being further characterized as having a molecular weight of about 1000-2000, a melt viscosity of about 50-1000 cps at 160° C. and a hydroxyl number of about 50-125, and (b) from about 10 to about 40%, based on the weight of said polyester, of a curing agent which is reactive with hydroxyl groups to crosslink said polyester.
Claim 4
Dependent Claim
109 words
A thermosetting composition comprising (a) a linear saturated crystalline polyester of an acid moiety and a moiety of a dihydric alcohol, at least 40 mole percent of the acid moiety being a terephthalic acid moiety, said polyester containing as moieties of the dihydric alcohol at least 40 mole percent 1,6-hexanediol, said polyester being further characterized as having a molecular weight of about 1000-2000, a melt viscosity of about 50-1000 cps at 160° C. and a hydroxyl number of about 50-125, and (b) from about 10 to about 40%, based on the weight of said polyester, of a curing agent which is reactive with hydroxyl groups to crosslink said polyester.
Claim 5
Dependent Claim
30 words
A composition according to claim 1 wherein said polyester contains moieties of at least one other glycol selected from the group consisting of ethylene glycol, 1,4-butaneidol, neopentyl glycol and 1,4-cyclohexanedimethanol.
Claim 6
Dependent Claim
11 words
A composition according to claim 2 wherein the glycol is 1,4-butanediol.
Claim 7
Dependent Claim
16 words
A composition according to claim 1 wherein the molecular weight of said polyester is about 1000-2000.
Claim 8
Dependent Claim
16 words
A composition according to claim 1 wherein the hydroxyl number of said polyester is about 50-125.
Claim 9
Dependent Claim
21 words
A composition according to claim 1 wherein said curing agent is selected from the group consisting of blocked isocyanates and melamines.
Claim 10
Dependent Claim
24 words
A composition according to claim 6 wherein said curing agent is an alkoxymelamine wherein the alkoxy group contains from 1 to 8 carbon atoms.
Claim 11
Dependent Claim
15 words
A composition according to claim 1 which further contains a catalyzingamount of an acid catalyst.
Claim 12
Dependent Claim
28 words
A composition according to claim 8 wherein said catalyst is present in an amount of from about 0.01 to about 5%, based on the weight of the polyester.
Claim 13
Dependent Claim
18 words
A composition according to claim 1 in particulate form of a size suitable for coating as a powder.
Claim 14
Dependent Claim
18 words
A composition according to claim 8 in particulate form of a size suitable for coating as a powder.
Claim 15
Dependent Claim
135 words
A thermosetting powder composition comprising (a) a linear saturated crystalline polyester of an acid moiety and a moiety of a dihydric alcohol, at least 40 mole percent of the acid moiety being a terephthalic acid moiety, said polyester containing as moieties of the dihydric alcohol at least 40 mole percent 1,6-hexanediol and a second glycol selected from the group consisting of ethylene glycol, 1,4-butanediol, neopentyl glycol and 1,4-cyclohexanedimethanol, said polyester being further characterized as having a molecular weight of about 1000-2000, a melt viscosity of about 50-1000 cps at 160° C. and a hydroxyl number of about 50-125, (b) from about 10 to about 40%, based on the weight of said polyester of a curing agent which is reactive with hydroxyl groups to crosslink said polyester, and (c) a catalyzing amount of an acid catalyst.
Claim 16
Dependent Claim
135 words
A thermosetting powder composition comprising (a) a linear saturated crystalline polyester of an acid moiety and a moiety of a dihydric alcohol, at least 40 mole percent of the acid moiety being a terephthalic acid moiety, said polyester containing as moieties of the dihydric alcohol at least 40 mole percent 1,6-hexanediol and a second glycol selected from the group consisting of ethylene glycol, 1,4-butanediol, neopentyl glycol and 1,4-cyclohexanedimethanol, said polyester being further characterized as having a molecular weight of about 1000-2000, a melt viscosity of about 50-1000 cps at 160° C. and a hydroxyl number of about 50-125, (b) from about 10 to about 40%, based on the weight of said polyester of a curing agent which is reactive with hydroxyl groups to crosslink said polyester, and (c) a catalyzing amount of an acid catalyst.
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) | 1987-04-10 | 1987-10-10 | 1988-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-10 | 1991-10-10 | 1992-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-10 | 1995-10-10 | 1996-04-10 | $7700.00 | Window Closed / Lapsed |