US4463140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powder coating
Assignee: BASF Schweiz AG
•
Filing: 1983-03-24
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Granted: 1984-07-31
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Expires: 2003-03-24
Abstract
Abstract Powder coatings and a powder composition having a valuable combination of characteristics are described, composed of a homogeneous mixture of between 1.9 and 9.0 wt. % of a diglycidyl phthalate and between 91.0 and 98.1 wt. % of a polyester, wherein said polyester has (a) an acid number between 10 and 30 mg KOH/g, (b) a hydroxyl number less than 15 mg KOH/g, (c) a theoretical number-average molecular weight between 3,750 and 12,500 and (d) a glass transition temperature between 48° and 85° C.
Inventors
- 👤 Eimbert G. Belder
- 👤 Robert van der Linde
- 👤 Jan Schippers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:12
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/20; C09; C09D; C09D167/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
76 words
A powder coating composition having a binding agent composed of a homogeneous mixture of between 1.9 and 9.0 wt.% of a diglycidyl phthalate and between 91.0 and 98.1 wt.% of a polyester, wherein said polyester has (a) an acid number between 10 and 30 mg KOH/g, (b) a hydroxyl number less than 15 mg KOH/g, (c) a theoretical number-average molecular weight between 3,750 and 12,500 and (d) a glass transition temperature between 48° and 85° C.
Claim 2
Dependent Claim
76 words
A powder coating composition having a binding agent composed of a homogeneous mixture of between 1.9 and 9.0 wt.% of a diglycidyl phthalate and between 91.0 and 98.1 wt.% of a polyester, wherein said polyester has (a) an acid number between 10 and 30 mg KOH/g, (b) a hydroxyl number less than 15 mg KOH/g, (c) a theoretical number-average molecular weight between 3,750 and 12,500 and (d) a glass transition temperature between 48° and 85° C.
Claim 3
Dependent Claim
10 words
A powder coating according to claim 1, containing diglycidyl terephthalate.
Claim 4
Dependent Claim
10 words
A powder coating according to claim 1 containing diglycidyl hexahydroterephthalate.
Claim 5
Dependent Claim
30 words
A powder coating according to claim 1 wherein the weight percentage of diglycidyl phthalate is between 3.2 and 7.1 and the weight percentage of polyester is between 96.8 and 92.9.
Claim 6
Dependent Claim
21 words
A powder coating according to claim 1 wherein said acid number of said polyester is between 15 and 28 mg KOH/g.
Claim 7
Dependent Claim
20 words
A powder coating according to claim 1, wherein said hydroxyl number of said polyester is less than 5 mg KOH/g.
Claim 8
Dependent Claim
20 words
A powder coating according to claim 1 wherein said polyester has a theoretical number-average molecular weight between 4,500 and 10,000.
Claim 9
Dependent Claim
22 words
A powder coating according to claim 1 wherein said diglycidyl terephthalate has an epoxy content between 6.7 and 9.3 equivalent per kg.
Claim 10
Dependent Claim
26 words
A powder coating according to claim 1 wherein said polyester has a dicarboxylic acid mixture at least 50 mol % of isophthalic acid and/or terephthalic acid.
Claim 11
Dependent Claim
26 words
A powder coating according to claim 1 wherein said polyester has a dicarboxylic acid mixture at least 70 mol % of isophthalic acid and/or terephthalic acid.
Claim 12
Dependent Claim
26 words
A powder coating according to claim 1 wherein said polyester having an aliphatic diol mixture of at least 50 mol.% of neopentyl glycol and/or propylene glycol.
Claim 13
Dependent Claim
31 words
A powder coating according to claim 1 wherein said polyester contains a compound having at least 4 methylene groups in an amount of at most 15 mol.% of the polyester composition.
Claim 14
Dependent Claim
69 words
A powder coating composition according to claim 1 wherein the weight percentage of diglycidyl phthalate is between 3.2 and 7.1 and the weight percentage of polyester is between 96.8 and 92.9, said acid number of said polyester is between 15 and 28 mg KOH/g, said hydroxyl number of said polyester is less than 5 mg KOH/g, and said polyester has a theoretical number-average molecular weight between 4,500 and 10,000.
Claim 15
Dependent Claim
22 words
A powder coating according to claim 13 wherein said diglycidyl terephthalate has an epoxy content between 6.7 and 9.3 equivalent per kg.
Claim 16
Dependent Claim
26 words
A powder coating according to claim 13 wherein said polyester has a dicarboxylic acid mixture at least 50 mol % of isophthalic acid and/or terephthalic acid.
Claim 17
Dependent Claim
26 words
A powder coating according to claim 13 wherein said polyester has a dicarboxylic acid mixture at least 70 mol % of isophthalic acid and/or terephthalic acid.
Claim 18
Dependent Claim
26 words
A powder coating according to claim 13 wherein said polyester having an aliphatic diol mixture of at least 50 mol.% of neopentyl glycol and/or propylene glycol.
Claim 19
Dependent Claim
31 words
A powder coating according to claim 13 wherein said polyester contains a compound having at least 4 methylene groups in an amount of at most 15 mol.% of the polyester composition.
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Cited
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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) | 1987-07-31 | 1988-01-30 | 1988-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-31 | 1992-01-30 | 1992-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-31 | 1996-01-30 | 1996-07-31 | $7700.00 | Window Closed / Lapsed |