US4145370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powdered coating composition of carboxyl terminated polyester, epoxy resin and zinc oxide
Assignee: British Industrial Plastics Ltd
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Filing: 1977-09-27
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Granted: 1979-03-20
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Expires: 1997-09-27
Abstract
Abstract A powder coating composition which comprises a carboxyl terminated polyester resin having a carboxyl functionality of at least 2, an epoxy resin which is at least difunctional with respect to epoxy groups and zinc oxide. The amount of zinc oxide is at least 1% by weight of the total weight of the resins, and the amounts of resins are such that the ratio of functional epoxy groups to carboxyl groups on a chemical equivalent basis is in the range 0.5:1.0 up to 3.0:1.0.
Inventors
- 👤 John E. Sreeves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:16
CPC Classifications
C; C09; C09D; C09D163/00; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08L; C08L63/00; C08L67/00; C09D167/00; Y; Y10; Y10S; Y10S524/00; Y10S524/904
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
93 words
A powder coating composition comprising a carboxyl terminated polyester resin having a carboxyl functionality of at least 2, an epoxy resin which is at least di-functional with respect to epoxy groups, and zinc oxide, the amounts of carboxyl terminated polyester and epoxy resin being such that the ratio of functional epoxy groups to carboxyl groups on a chemical equivalent basis is in the range 0.5:1.0 up to 3.0:1.0 and the amount of zinc oxide in the composition being at least 1% by weight based on the total weight of polyester and epoxy resins.
Claim 2
Dependent Claim
93 words
A powder coating composition comprising a carboxyl terminated polyester resin having a carboxyl functionality of at least 2, an epoxy resin which is at least di-functional with respect to epoxy groups, and zinc oxide, the amounts of carboxyl terminated polyester and epoxy resin being such that the ratio of functional epoxy groups to carboxyl groups on a chemical equivalent basis is in the range 0.5:1.0 up to 3.0:1.0 and the amount of zinc oxide in the composition being at least 1% by weight based on the total weight of polyester and epoxy resins.
Claim 3
Dependent Claim
37 words
A powder coating composition according to claim 1 in which the amounts of the polyester and epoxy resins are such that the ratio of functional epoxy groups to carboxyl groups in the composition is greater than 1:1.
Claim 4
Dependent Claim
29 words
A powder coating composition according to claim 2 in which the ratio of functional epoxy groups to carboxyl groups in the composition is in the range 1:1 to 1.5:1.0.
Claim 5
Dependent Claim
34 words
A powder coating composition according to claim 1 in which the amount of zinc oxide in the composition is at least 2.5% by weight based on the total weight of polyester and epoxy resins.
Claim 6
Dependent Claim
28 words
A powder coating composition according to claim 4 in which the amount of zinc oxide is not more than 50% by weight of the total weight of resin.
Claim 7
Dependent Claim
17 words
A powder coating composition according to claim 1 in which the zinc oxide is colloidal zinc oxide.
Claim 8
Dependent Claim
14 words
A powder coating composition according to claim 1 comprising also one or more pigments.
References Cited (Backward Citations)
US3268477A
Cited
US3576903A
Cited
GB1275768A
Cited
US3966836A
Cited
US3979477A
Cited
US4085159A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |