US4581293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating powder
Assignee: PNC Bank NA
•
Filing: 1985-02-05
•
Granted: 1986-04-08
•
Expires: 2005-02-05
Abstract
Abstract Disclosed is an epoxy rubber made by reacting about 5 to about 50% of an epoxy terminated acrylonitrilebutadiene copolymer with about 50 to about 95% of a solid epoxy resin. A coating powder is prepared with about 30 to about 70% of a solid epoxy resin, about 2 to about 25% of the epoxy rubber, about 5 to about 25% of an anhydride curing agent, about 5 to about 40% mica filler, and about 10 to about 50% glass fiber. Electrical apparatus, such as coils made of served wire, can be coated with the powder by heating the apparatus above the melting point of the powder and dipping it in the fluidized powder, followed by curing the melted powder on the apparatus.
Inventors
- 👤 Howard E. Saunders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:05
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08G; C08G59/00; C08G59/02; C08G59/12; C08G59/18; C08G59/20; C08G59/22; C08G59/226; C08G59/40; C08G59/42; C08G59/68; C08K7/00; C08K7/02; C08K7/04; C08K7/14; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31522
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
85 words
A coating powder comprising: (1) about 5 to about 35% of an epoxy rubber which comprises the solventless reaction product of about 5 to about 50% of a solventless carboxy terminated acrylonitrile-butadiene copolymer with about 50 to about 95% of a first solid epoxy resin; (2) about 30 to about 70% of a second solid epoxy resin; (3) about 5 to about 25% of an anhydride curing agent; (4) about 5 to about 40% mica filler; and (5) about 10 to about 50% glass fibers.
Claim 2
Dependent Claim
85 words
A coating powder comprising: (1) about 5 to about 35% of an epoxy rubber which comprises the solventless reaction product of about 5 to about 50% of a solventless carboxy terminated acrylonitrile-butadiene copolymer with about 50 to about 95% of a first solid epoxy resin; (2) about 30 to about 70% of a second solid epoxy resin; (3) about 5 to about 25% of an anhydride curing agent; (4) about 5 to about 40% mica filler; and (5) about 10 to about 50% glass fibers.
Claim 3
Dependent Claim
18 words
A coating powder according to claim 1 wherein said first and second solid epoxy resins are the same.
Claim 4
Dependent Claim
15 words
A coating powder according to claim 1 wherein said anhydride curing agent is a monoanhydride.
Claim 5
Dependent Claim
13 words
A coating powder according to claim 3 wherein said monoanhydride is tetrahydrophthalic anhydride.
Claim 6
Dependent Claim
19 words
A coating powder according to claim 1 which includes about 0.2 to about 5% of a flow control agent.
Claim 7
Dependent Claim
15 words
A coating powder according to claim 1 which includes about 0.5 to about 10% benzoin.
Claim 8
Dependent Claim
17 words
A coating powder according to claim 1 which includes about 0.2 to about 5% of an antioxidant.
Claim 9
Dependent Claim
17 words
A coating powder according to claim 1 which includes about 1 to about 10% of a pigment.
Claim 10
Dependent Claim
16 words
A coating powder according to claim 1 wherein said mica filler is finer than 325 mesh.
Claim 11
Dependent Claim
18 words
A coating powder according to claim 1 ground to a particle size of less than about 200 microns.
Claim 12
Dependent Claim
61 words
A coating powder according to claim 1 comprising: (1) about 40 to 60% of said second solid epoxy resin; (2) about 5 to about 15% of said epoxy rubber; (3) about 5 to about 15% of said anhydride curing agent; (4) about 10 to about 30% of said mica filler; and (5) about 10 to about 30% of said glass fibers.
Claim 13
Dependent Claim
22 words
A coating powder according to claim 1 which includes about 0.01 to about 5% of an accelerator for said anhydride curing agent.
Claim 14
Dependent Claim
21 words
A coating powder according to claim 12 wherein said accelerator is about 0.1 to about 1% of a quaternary phosphonium salt.
Claim 15
Dependent Claim
60 words
A method of insulating a coil of served wire comprising: (A) fluidizing a coating powder according to claim 1; (B) heating said coil above the melting point of said coating powder; (C) dipping said heated coil into said fluidized coating powder so that said coating powder melts over said coil; and (D) curing said melted coating powder on said coil.
Claim 16
Dependent Claim
13 words
An electrical apparatus coated with a cured coating powder according to claim 1.
Claim 17
Dependent Claim
13 words
An insulated coil coated with a cured coating powder according to claim 1.
Claim 18
Independent Claim
107 words
A method of making a coating powder comprising: (A) preparing an epoxy rubber by reacting (1) about 5 to about 50% of a solventless carboxy terminated acrylonitrile-butadiene copolymer with (2) about 50 to about 95% of a first solid epoxy resin; (B) preparing a composition which comprises: (1) about 30 to about 70% of a second solid epoxy resin; (2) about 5 to about 35% of said epoxy rubber; (3) about 5 to about 25% of an anhydride curing agent; (4) about 5 to about 40% mica filler; and (5) about 10 to about 50% glass fibers; and (C) comminuting said composition to form said coating powder.
Claim 19
Independent Claim
107 words
A method of making a coating powder comprising: (A) preparing an epoxy rubber by reacting (1) about 5 to about 50% of a solventless carboxy terminated acrylonitrile-butadiene copolymer with (2) about 50 to about 95% of a first solid epoxy resin; (B) preparing a composition which comprises: (1) about 30 to about 70% of a second solid epoxy resin; (2) about 5 to about 35% of said epoxy rubber; (3) about 5 to about 25% of an anhydride curing agent; (4) about 5 to about 40% mica filler; and (5) about 10 to about 50% glass fibers; and (C) comminuting said composition to form said coating powder.
References Cited (Backward Citations)
US2888541A
Cited
US2997776A
Cited
US3316195A
Cited
US3894113A
Cited
US3655818A
Cited
US4040993A
Cited
US4476285A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |