US4068039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow control agent for ultra thin epoxy resin powder coatings
Assignee: WR Grace and Co
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Filing: 1976-10-21
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Granted: 1978-01-10
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Expires: 1996-10-21
Abstract
Abstract A thermosetting resin composition consisting essentially of a solid epoxy resin having a molecular weight in the range 1,000-4,000, 1-15% by weight of the epoxy resin of a curing agent therefor and 0.5 to 3.0% by weight of the composition of a flow control agent consisting essentially of liquid poly(ethyl acrylate) having a number average molecular weight in the range 5,000 to 15,000. The composition when melt compounded and milled to an average particle size diameter of 2-20 microns can be electrostatically deposited onto metallic surfaces such as can interiors to produce an ultra thin (0.3-1.0 mil thick) protective coating on curing.
Inventors
- 👤 Donald Wayne Larsen
- 👤 Jerrold Bain Billmyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:01
CPC Classifications
C; C09; C09D; C09D163/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31529; Y10T428/31678; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
127 words
The process of coating a metal substrate which comprises electrostatically depositing on said substrate in an amount sufficient to attain a cured coating having a thickness in the range of 0.3-1.0 mil a particulate thermosetting resin composition consisting essentially of a solid epoxy resin formed from the reaction of bisphenol A and epichlorohydrin and having a molecular weight in the range 1,000-4,000, 1-15% by weight of the epoxy resin of a curing agent therefor and 0.5-3.0% by weight of the composition of a flow control agent consisting essentially of liquid poly(ethyl acrylate) having a number average molecular weight in the range 5,000-15,000, the particles of said composition having an average size diameter of 2-20 microns and thereafter heating said coated substrate to form a continuous coating thereon.
Claim 2
Dependent Claim
127 words
The process of coating a metal substrate which comprises electrostatically depositing on said substrate in an amount sufficient to attain a cured coating having a thickness in the range of 0.3-1.0 mil a particulate thermosetting resin composition consisting essentially of a solid epoxy resin formed from the reaction of bisphenol A and epichlorohydrin and having a molecular weight in the range 1,000-4,000, 1-15% by weight of the epoxy resin of a curing agent therefor and 0.5-3.0% by weight of the composition of a flow control agent consisting essentially of liquid poly(ethyl acrylate) having a number average molecular weight in the range 5,000-15,000, the particles of said composition having an average size diameter of 2-20 microns and thereafter heating said coated substrate to form a continuous coating thereon.
Claim 3
Dependent Claim
58 words
An article having a fused epoxy resin coating, said coating containing 1-15 parts by weight of the epoxy resin of a curing agent therefor and 0.5-3.0 parts by weight of the epoxy resin and curing agent of a flow control agent consisting essentially of liquid poly(ethyl acrylate) having a number average molecular weight in the range 5,000- 15,000.
Claim 4
Dependent Claim
58 words
An article having a fused epoxy resin coating, said coating containing 1-15 parts by weight of the epoxy resin of a curing agent therefor and 0.5-3.0 parts by weight of the epoxy resin and curing agent of a flow control agent consisting essentially of liquid poly(ethyl acrylate) having a number average molecular weight in the range 5,000- 15,000.
Claim 5
Dependent Claim
82 words
A coated article comprising a substrate and a coating thereon, said coating comprising the fused product of an intimate mixture of an epoxy resin formed from the reaction of bisphenol A and epichlorohydrin and having a molecular weight in the range 1,000-4,000, 1-15% by weight of the epoxy resin of a curing agent therefor and 0.5-3.0% by weight of the coating of a flow control agent consisting essentially of liquid poly(ethyl acrylate) having a number average molecular weight in the range 5,000-15,000.
Claim 6
Dependent Claim
82 words
A coated article comprising a substrate and a coating thereon, said coating comprising the fused product of an intimate mixture of an epoxy resin formed from the reaction of bisphenol A and epichlorohydrin and having a molecular weight in the range 1,000-4,000, 1-15% by weight of the epoxy resin of a curing agent therefor and 0.5-3.0% by weight of the coating of a flow control agent consisting essentially of liquid poly(ethyl acrylate) having a number average molecular weight in the range 5,000-15,000.
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) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |