Patent US4370191A successfully refreshed from Google Patents.
US4370191A
Expired / Lapsed
US
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Electrical laminate
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1980-07-02
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Granted: 1983-01-25
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Expires: 2000-07-02
Abstract
Abstract An electrical laminate comprising layers of a resin impregnated fibrous substrate is disclosed. The resin has a glass transition point from about 20 DEG C. to 80 DEG C. and comprises a cured product of a mixture of an unsaturated polyester polymer and a cross-linking monomer. The laminate exhibits an improved punchability at a temperature not lower but not 20 DEG C. higher than the glass transition point of the resin.
Inventors
- 👤 Masakazu Uekita
- 👤 Masaharu Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:19
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/10; B32B15/00; B32B15/04; B32B15/08; B32B5/00; B32B5/02; B32B5/022; B32B5/024; B32B5/026; B32B7/00; B32B7/04; B32B7/12; C; C09; C09J; C09J5/00; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/53; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0326; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31786; Y10T428/3179; Y10T428/31794
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
114 words
In a method for producing an electrical laminate comprising the steps of impregnating a paper substrate with a curable liquid resin consisting essentially of an unsaturated polyester polymer obtained by esterifying a mixture of a saturated polybasic acid component and an unsaturated polybasic acid component with a substantially stoichiometric amount of a polyol component, and a cross-linking vinyl monomer, laminating a plurality of the resin-impregnated substrates, and curing the laminate, the improvement comprising employing as said liquid resin one consisting of said curable resin which is in liquid phase at room temperature, has a viscosity of 0.1-30 poise and, when fully cured, has a glass transition point from about 20° C. to 80° C.
Claim 2
Dependent Claim
114 words
In a method for producing an electrical laminate comprising the steps of impregnating a paper substrate with a curable liquid resin consisting essentially of an unsaturated polyester polymer obtained by esterifying a mixture of a saturated polybasic acid component and an unsaturated polybasic acid component with a substantially stoichiometric amount of a polyol component, and a cross-linking vinyl monomer, laminating a plurality of the resin-impregnated substrates, and curing the laminate, the improvement comprising employing as said liquid resin one consisting of said curable resin which is in liquid phase at room temperature, has a viscosity of 0.1-30 poise and, when fully cured, has a glass transition point from about 20° C. to 80° C.
Claim 3
Dependent Claim
24 words
The method of claim 1 further comprising the step of adhesively bonding a cladding metal foil onto at least one side of the laminate.
Claim 4
Dependent Claim
33 words
The method of claim 1 further comprising the step of punching the laminate at a temperature not lower than but not 20° C. higher than said glass transition point after said curing step.
Claim 5
Dependent Claim
15 words
The method of claim 1, wherein said paper is pre-impregnated with a methylol group-containing compound.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |