Patent US4528341A successfully refreshed from Google Patents.
US4528341A
Expired / Lapsed
US
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Polyester and its use in powder coating
Assignee: Covestro Resins BV
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Filing: 1984-08-08
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Granted: 1985-07-09
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Expires: 2004-08-08
Abstract
Abstract An improved carboxyl-group-containing polyester resin composition as described of an aromatic carboxylic acid and an aliphatic diol having the following combination of properties: (a) an acid number between 10 and 26 mg KOH/g, (b) a hydroxyl number that is smaller than 15 mg KOH/g, (c) a theoretical number-average molecular weight between 4,500 and 12,500 and (d) a glass transistion temperature between 40° 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
2026-11-09 08:44
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/20; C09; C09D; C09D167/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
104 words
A powder coating wherein the binding agent is composed of a homogeneous mixture of a tri-epoxy compound and a polyester containing carboxyl groups, wherein said mixture contains between 1.4 and 5.3 wt. % of a tri-epoxy compound, and from 94.7 to 98.6 wt. % of a polyester of an aromatic dicarboxylic acid and an aliphatic diol having the following combination of properties: (a) an acid number between 10 and 26 mg KOH/g, (b) a hydroxyl number that is smaller than 15 mg KOH/g, (c) a theoretical number-average molecular weight between 4,500 and 12,500 and (d) a glass transition temperature between 40° and 85° C.
Claim 2
Dependent Claim
104 words
A powder coating wherein the binding agent is composed of a homogeneous mixture of a tri-epoxy compound and a polyester containing carboxyl groups, wherein said mixture contains between 1.4 and 5.3 wt. % of a tri-epoxy compound, and from 94.7 to 98.6 wt. % of a polyester of an aromatic dicarboxylic acid and an aliphatic diol having the following combination of properties: (a) an acid number between 10 and 26 mg KOH/g, (b) a hydroxyl number that is smaller than 15 mg KOH/g, (c) a theoretical number-average molecular weight between 4,500 and 12,500 and (d) a glass transition temperature between 40° and 85° C.
Claim 3
Dependent Claim
17 words
A polyester according to claim 1, wherein said acid number is between 12 and 24 mg KOH/g.
Claim 4
Dependent Claim
17 words
A polyester according to claim 1 wherein said hydroxyl number is 5 mg KOH/g at a maximum.
Claim 5
Dependent Claim
17 words
A polyester according to claim 1, wherein said theoretical number-average molecular weight is between 5,000 and 10,000.
Claim 6
Dependent Claim
20 words
A polyester according to claim 1, wherein said glass transition temperature of the polyester is between 50° and 70° C.
Claim 7
Dependent Claim
19 words
A polyester according to claim 1, wherein said average carboxyl functionality of the polyester is between 2 and 3.
Claim 8
Dependent Claim
19 words
A polyester according to claim 1, wherein said average carboxyl functionality of the polyester is between 2.2 and 2.8.
Claim 9
Dependent Claim
24 words
A polyester according to claim 1, wherein said dicarboxylic acid mixture consists of at least 50 wt. % of isophthalic acid and/or terephthalic acid.
Claim 10
Dependent Claim
24 words
A polyester according to claim 1, wherein said dicarboxylic acid mixture consists of at least 70 mol. % of isophthalic acid and/or terephthalic acid.
Claim 11
Dependent Claim
24 words
A polyester according to claim 1, wherein said aliphatic diol mixture consists of at least 50 mol. % of neopentyl glycol and propylene glycol.
Claim 12
Dependent Claim
28 words
A polyester according to claim 1, wherein said polyester contains a compound which has at least 4 methylene groups in an amount of up to 15 mol. %.
Claim 13
Dependent Claim
20 words
A powder coating according to claim 10, wherein the weight percentage of said tri-epoxy compound is between 1.6 and 4.9.
Claim 14
Dependent Claim
14 words
A powder coating according to claim 10 wherein said tri-epoxy compound is triglycidyl isocyanurate.
Claim 15
Dependent Claim
63 words
A polyester according to claim 1 wherein said acid number is between 12 and 24 mg KOH/g, said hydroxyl number is 5 mg KOH/g at a maximum, said theoretical number-average molecular weight is between 5,000 and 10,000, said glass transition temperature of the polyester is between 50° and 70° C. and said average carboxyl functionality of the polyester is between 2 and 3.
Claim 16
Dependent Claim
24 words
A polyester according to claim 14 wherein said dicarboxylic acid mixture consists of at least 50 wt. % of isophthalic acid and/or terephthalic acid.
Claim 17
Dependent Claim
24 words
A polyester according to claim 14 wherein said dicarboxylic acid mixture consists of at least 70 mol. % of isophthalic acid and/or terephthalic acid.
Claim 18
Dependent Claim
24 words
A polyester according to claim 14 wherein said aliphatic diol mixture consists of at least 50 mol. % of neopentyl glycol and propylene glycol.
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) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |