US4554470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polybutadiene VPI resin
Assignee: Westinghouse Electric Corp
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Filing: 1984-06-08
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Granted: 1985-11-19
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Expires: 2004-06-08
Abstract
Abstract Disclosed is a coil of insulated wire impregnated with a solventless vacuum pressure impregnated resin. The resin contains polybutadiene, at least 15% of which is 1,2-polybutadiene, about 10 about 150 phr dicyclopentadiene acrylate, about 0.005 to about 0.75 phr of a free radial polymerization inhibitor, about 0.05 to about 2.5 phr of a free radial polymerization initiator, and up to about 2.0 phr of a coupling agent. An optional component is about 1 to about 80 phr of an aromatic monomer having 1 to 2 vinyl groups. Also disclosed is a method of making a vacuum pressure impregnated coil by placing a coil of insulated wire in a partial vacuum, impregnating the coil with the resin, applying pressure to the resin to force it into the interstices of the coil, and curing the resin by heating it at about 100 DEG to about 180 DEG C. for about 2 to about 16 hours.
Inventors
- 👤 Donald D. Jerson
- 👤 James F. Chance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:27
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/30; C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/16; C08F220/18; C08F220/1811; C08F279/00; C08F279/02; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2938; Y10T428/294; Y10T428/2942; Y10T428/2947
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
66 words
An electrical article comprising a coil of insulated elongated conductors impregnated with a resin which comprises: (A) polybutadiene, at least about 15% of which is 1,2-polybutadiene; (B) about 10 to about 150 phr dicyclopentadiene acrylate; (C) about 0.005 to about 0.75 phr free radical polymerization inhibitor; (D) about 0.05 to about 2.5 phr free radical polymerization initiator; and (E) up to about 2.0 phr coupling agent.
Claim 2
Dependent Claim
66 words
An electrical article comprising a coil of insulated elongated conductors impregnated with a resin which comprises: (A) polybutadiene, at least about 15% of which is 1,2-polybutadiene; (B) about 10 to about 150 phr dicyclopentadiene acrylate; (C) about 0.005 to about 0.75 phr free radical polymerization inhibitor; (D) about 0.05 to about 2.5 phr free radical polymerization initiator; and (E) up to about 2.0 phr coupling agent.
Claim 3
Dependent Claim
26 words
An article according to claim 1 wherein said resin includes about 1 to about 80 phr of an aromatic monomer having 1 to 2 vinyl groups.
Claim 4
Dependent Claim
13 words
An article according to claim 2 wherein said aromatic monomer is vinyl toluene.
Claim 5
Dependent Claim
17 words
An article according to claim 1 wherein said insulated elongated conductors is a motor or generator winding.
Claim 6
Dependent Claim
15 words
An article according to claim 1 wherein said free radical polymerization inhibitor is tert-butyl hydroquinone.
Claim 7
Dependent Claim
15 words
An article according to claim 1 wherein said free radical polymerization initiator is dicumyl peroxide.
Claim 8
Dependent Claim
13 words
An article according to claim 1 wherein said coupling agent is a silane.
Claim 9
Dependent Claim
13 words
An article according to claim 7 wherein said silane is vinyl-tris (betamethoxyethoxy) silane.
Claim 10
Dependent Claim
26 words
An article according to claim 1 wherein said resin has been vacuum pressure impregnated into the interstices of said coil of insulated elongated conductors, and cured.
Claim 11
Dependent Claim
15 words
An article according to claim 1 wherein said elongated conductors are individually and collectively insulated.
Claim 12
Dependent Claim
15 words
An article according to claim 10 wherein said insulation comprises mica having a polybutadiene binder.
Claim 13
Dependent Claim
61 words
An article according to claim 11 wherein said polybutadiene binder comprises: (A) polybutadiene, at least about 15% of which is 1,2-polybutadiene; (B) about 10 to about 150 phr dicyclopentadiene acrylate; (C) about 0.005 to about 0.75 phr free radical polymerization inhibitor; (D) about 0.05 to about 2.5 phr free radical polymerization initiator; and (E) up to about 2.0 phr coupling agent.
Claim 14
Dependent Claim
65 words
An electrical article comprising a coil of insulated elongated conductors impregnated with a composition comprising: (A) polybutadiene, at least about 15% of which is 1,2-polybutadiene, (B) about 10 to about 150 phr dicyclopentadiene acrylate; (C) about 0.005 to about 0.75 phr free radical polymerization inhibitor; (D) about 0.05 to about 2.5 phr free radical polymerization initiator; and (E) up to about 2.0 phr coupling agent.
Claim 15
Dependent Claim
65 words
An electrical article comprising a coil of insulated elongated conductors impregnated with a composition comprising: (A) polybutadiene, at least about 15% of which is 1,2-polybutadiene, (B) about 10 to about 150 phr dicyclopentadiene acrylate; (C) about 0.005 to about 0.75 phr free radical polymerization inhibitor; (D) about 0.05 to about 2.5 phr free radical polymerization initiator; and (E) up to about 2.0 phr coupling agent.
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) | 1988-11-18 | 1989-05-20 | 1989-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-18 | 1993-05-20 | 1993-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-18 | 1997-05-20 | 1997-11-19 | $7700.00 | Window Closed / Lapsed |