US4452847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet material impregnated with a highly cross linked thermally stable epoxy composition
Assignee: Isola Laminate Systems Corp
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Filing: 1982-11-17
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Granted: 1984-06-05
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Expires: 2002-11-17
Abstract
Abstract An alkyl-di-substituted imidazole, is used as accelerator and co-curing agent in epoxy coating and impregnating resins useful in the manufacture of high temperature multi-layer laminates.
Inventors
- 👤 John T. Siemon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:05
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/14; B32B27/00; B32B27/04; B32B7/00; B32B7/04; B32B7/12; C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/4007; C08G59/4014; C08G59/4021; C08G59/68; C08G59/686; C08J; C08J5/00; C08J5/24; C08J5/241; C08J5/244; C08J5/249; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0326; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2307/00; B32B2307/30; B32B2307/306; B32B2307/3065; B32B2309/00; B32B2309/08; B32B2309/10; B32B2309/105; B32B2315/00; B32B2315/08; B32B2315/085; B32B2457/00; B32B2457/08; C08J2363/00; H05K3/00; H05K3/46; H05K3/4611; H05K3/4626; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10S428/92; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31518; Y10T428/31525; Y10T442/00; Y10T442/20; Y10T442/2631; Y10T442/2721; Y10T442/2738; Y10T442/30; Y10T442/3382; Y10T442/3415
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
94 words
A "B"-staged adhesive resin impregnated material comprising glass fabric, the resin comprising: (A) epoxy resin; (B) curing agent selected from the group consisting of dicyandiamide, monomethylol dicyandiamide, and mixtures thereof; and (C) accelerator, co-curing agent consisting of 2-alkyl, 4-methylimidazole having the structural formula: ##STR2## where the alkyl group R contains from 2 to 8 carbon atoms, where the weight ratio of (epoxy): (curing agent): (2-alkyl, 4-methylimidazole) is from about (100): (2.0 to 2.5): (0.5 to 1.0), said impregnated material characterized as having a Tg (DSC) value of over about 150° C. upon complete cure.
Claim 2
Dependent Claim
94 words
A "B"-staged adhesive resin impregnated material comprising glass fabric, the resin comprising: (A) epoxy resin; (B) curing agent selected from the group consisting of dicyandiamide, monomethylol dicyandiamide, and mixtures thereof; and (C) accelerator, co-curing agent consisting of 2-alkyl, 4-methylimidazole having the structural formula: ##STR2## where the alkyl group R contains from 2 to 8 carbon atoms, where the weight ratio of (epoxy): (curing agent): (2-alkyl, 4-methylimidazole) is from about (100): (2.0 to 2.5): (0.5 to 1.0), said impregnated material characterized as having a Tg (DSC) value of over about 150° C. upon complete cure.
Claim 3
Dependent Claim
48 words
The resin impregnated material of claim 1 being glass fabric; and wherein the epoxy resin is a diglycidyl ether of bisphenol A, the impregnated material is characterized as being thermally stable, and having low expansion properties upon complete cure, and the resin has a fast, "B"-stage gel time.
Claim 4
Dependent Claim
29 words
The resin impregnated material of claim 1, also containing an effective amount of flame retardant and an effective amount of diluent for the flame retardant and the curing agent.
Claim 5
Dependent Claim
14 words
The resin impregnated material of claim 1, wherein the 2-alkyl, 4-methylimidazole is 2-ethyl, 4-methylimidazole.
Claim 6
Dependent Claim
54 words
A laminated multilayer printed circuit board comprising at least two circuit boards, each circuit board comprising at least one metal conductor sheet supported by a core laminate, with an adhesive separator disposed between at least two circuit boards in the multilayer board, the adhesive separator being the cured resin impregnated material of claim 1.
Claim 7
Dependent Claim
31 words
The multilayer printed circuit board of claim 5, wherein the metal conductor sheet is a patterned copper electrical circuit and the resin impregnated material in the adhesive separator is glass fabric.
References Cited (Backward Citations)
US4327143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |