US4400438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing fire retardant and heat resistant copper-clad laminated board, and varnish therefor
Assignee: HITACI CHEMICA COMPANY Ltd A CORPOF
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Filing: 1981-03-30
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Granted: 1983-08-23
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Expires: 2001-03-30
Abstract
Abstract A process for producing a fire retardant and heat resistant copper-clad laminated board, characterized in that a maleimide resin type varnish containing a small amount of a specific halogenated diphenyl ether compound is used for impregnation of base material therewith. Copper-clad laminated boards produced according to the present invention may be so improved in fire or flame retardant properties as to be classed 94 V-0 in accordance with UL 94 (vertical burning test), and, nevertheless, are not substantially downgraded in heat resisting properties as well as copper foil peel strength.
Inventors
- 👤 Akio Takahashi
- 👤 Yutaka Itoh
- 👤 Takeshi Shimazaki
- 👤 Motoyo Wajima
- 👤 Hirosada Morishita
- 👤 Yutaka Mizuno
- 👤 Shunya Yokozawa
- 👤 Kenji Tsukanishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:07
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/04; B32B15/00; B32B15/20; B32B15/14; C; C09; C09D; C09D179/00; C09D179/04; C09D179/08; C09D179/085; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0373; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2307/00; B32B2307/30; B32B2307/306; B32B2307/3065; H05K2201/00; H05K2201/01; H05K2201/0104; H05K2201/012; H05K2203/00; H05K2203/12; H05K2203/122; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31681
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
48 words
A process for producing a fire retardant and heat resistant copper-clad laminated board, which comprises the steps of: (1) impregnating a base material with a varnish comprising a solvent, at least one maleimide compound and/or resin containing at least one maleimide group represented by the formula (I): ##STR8##
Claim 2
Dependent Claim
48 words
A process for producing a fire retardant and heat resistant copper-clad laminated board, which comprises the steps of: (1) impregnating a base material with a varnish comprising a solvent, at least one maleimide compound and/or resin containing at least one maleimide group represented by the formula (I): ##STR8##
Claim 3
Dependent Claim
114 words
1 to 10% by weight, based on the resin content of the varnish, of at least one halogenated diphenyl ether compound containing at least eight halogen atoms and represented by the formula (II): ##STR9## wherein X 1 to X 10 each independently is a chlorine atom, a bromine atom, a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group or an amino group; (2) drying the impregnated base material to prepare a prepreg; and (3) contact-bonding under heat and pressure a required number of sheets of the prepreg placed in contact relationship and one sheet of copper foil placed thereon or two sheets of copper foil sandwiching the same.
Claim 4
Dependent Claim
114 words
1 to 10% by weight, based on the resin content of the varnish, of at least one halogenated diphenyl ether compound containing at least eight halogen atoms and represented by the formula (II): ##STR9## wherein X 1 to X 10 each independently is a chlorine atom, a bromine atom, a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group or an amino group; (2) drying the impregnated base material to prepare a prepreg; and (3) contact-bonding under heat and pressure a required number of sheets of the prepreg placed in contact relationship and one sheet of copper foil placed thereon or two sheets of copper foil sandwiching the same.
Claim 5
Dependent Claim
12 words
A copper-clad laminated board produced by a process according to claim 1.
Claim 6
Dependent Claim
34 words
A varnish for use in the production of copper-clad laminated boards which comprises a solvent, at leas one maleimide compound and/or resin containing at least one maleimide group represented by the formula (I): ##STR10##
Claim 7
Dependent Claim
34 words
A varnish for use in the production of copper-clad laminated boards which comprises a solvent, at leas one maleimide compound and/or resin containing at least one maleimide group represented by the formula (I): ##STR10##
Claim 8
Dependent Claim
68 words
1 to 10% by weight, based on the resin content of the varnish, of at least one halogenated diphenyl ether compound containing at least eight halogen atoms and represented by the formula (II): ##STR11## wherein X 1 to X 10 each independently is a chlorine atom, a bromine atom, a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group or an amino group.
Claim 9
Dependent Claim
68 words
1 to 10% by weight, based on the resin content of the varnish, of at least one halogenated diphenyl ether compound containing at least eight halogen atoms and represented by the formula (II): ##STR11## wherein X 1 to X 10 each independently is a chlorine atom, a bromine atom, a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group or an amino group.
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) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |