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US4662973A
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US
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Continuous process for preparing reinforced resin laminates
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1982-12-20
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Granted: 1987-05-05
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Expires: 2002-12-20
Abstract
Abstract A continuous process for producing reinforced resin laminates is disclosed. A plurality of fibrous substrate is continuously and sequentially subjected to the steps of (a) impregnating with resin, (b) laminating into a unitary member, (c) sandwiching between a pair of covering sheet, at least one of which is a cladding metal foil, and (d) curing the resin while supporting between said covering sheets without applying pressure on the laminate surface.
Inventors
- 👤 Masana Gotou
- 👤 Minoru Isshiki
- 👤 Shoji Uozumi
- 👤 Masayuki Ohizumi
- 👤 Yasuo Fushiki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:44
CPC Classifications
B; B32; B32B; B32B38/00; B32B38/08; H; H05; H05K; H05K3/00; H05K3/02; H05K3/022; B32B2457/00; B32B2457/08; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/036; H05K1/0366; H05K2203/00; H05K2203/06; H05K2203/068; H05K2203/15; H05K2203/1545; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
211 words
In a continuous process for preparing flat, rigid, reinforced resin laminate printed circuit board stock material comprising the steps of impregnating a plurality of fibrous substrate sheets with a liquid themosetting resin composition free of volatile components and capable of curing without generating a volatile byproduct; continuously combining a plurality of the resultant impregnated substrates into a continuous, unitary, multiple ply uncured laminate sheet; continuously sandwiching the uncured laminate sheet between a pair of continuous covering sheets, at least one of which is a cladding metal foil capable of adhering to the surface of the uncured laminate to form a continuous flat sandwich; and continuously curing the resultant sandwich to form a continuous sheet of printed circuit board stock material; the improvement which comprises: (a) thoroughly impregnating the substrate sheets with resin by continuously contacting the sheets individually and separately with excess resin; (b) continuously forming the resin-impregnated substrate sheets and cover sheets into a sandwich of a desired thickness while the resin is uncured; and (c) continuously curing the uncured sandwich in the absence of external compressive force thereon perpendicular to the plane of the sandwich to form a continuous sheet of the printed circuit board stock material having uniform thickness, electrical, dielectric, and heat resistant properties along its length.
Claim 2
Dependent Claim
211 words
In a continuous process for preparing flat, rigid, reinforced resin laminate printed circuit board stock material comprising the steps of impregnating a plurality of fibrous substrate sheets with a liquid themosetting resin composition free of volatile components and capable of curing without generating a volatile byproduct; continuously combining a plurality of the resultant impregnated substrates into a continuous, unitary, multiple ply uncured laminate sheet; continuously sandwiching the uncured laminate sheet between a pair of continuous covering sheets, at least one of which is a cladding metal foil capable of adhering to the surface of the uncured laminate to form a continuous flat sandwich; and continuously curing the resultant sandwich to form a continuous sheet of printed circuit board stock material; the improvement which comprises: (a) thoroughly impregnating the substrate sheets with resin by continuously contacting the sheets individually and separately with excess resin; (b) continuously forming the resin-impregnated substrate sheets and cover sheets into a sandwich of a desired thickness while the resin is uncured; and (c) continuously curing the uncured sandwich in the absence of external compressive force thereon perpendicular to the plane of the sandwich to form a continuous sheet of the printed circuit board stock material having uniform thickness, electrical, dielectric, and heat resistant properties along its length.
Claim 3
Dependent Claim
14 words
A process according to claim 1, wherein both covering sheets are cladding metal foils.
Claim 4
Dependent Claim
37 words
A process according to claim 1, wherein only one of the covering sheets is a cladding metal foil and the other covering sheet is continuously released from the printed circuit board stock material after the curing step.
Claim 5
Dependent Claim
16 words
A process according to claim 1, wherein the continuously releasing covering sheet is an endless belt.
Claim 6
Dependent Claim
15 words
A process according to claim 1, wherein the cladding metal foil is electrolytic copper foil.
Claim 7
Dependent Claim
18 words
A process according to claim 5, wherein the copper foil has been pre-coated with a silane coupling agent.
Claim 8
Dependent Claim
138 words
A process according to claim 1, wherein dry substrate sheets are pre-impregnated with an effective amount of up to 50% by weight of a composition selected from the group consisting of: (a) a silane coupling agent to improve the adhesion of the substrate to the resin; (b) polymerizable monomers or comonomers to increase resin impregnation speed; (c) a thermoplastic material to improve mechanical and/or electrical characteristics of the resulting laminate; (d) a solution of thermosetting resin or a prepolymer thereof to reduce moisture pick-up in the finished laminate; (e) ethylenically unsaturated aliphatic carboxylic acids to improve impregnation of the substrate with unsaturated polyester resin; (f) a hydrophobic reactant for the substrate to retard moisture pick-up of a hydrophobic substrate; (g) a curing catalyst followed by drying to prolong the pot life of liquid resin; and (h) inorganic fillers.
Claim 9
Dependent Claim
22 words
A process according to claim 1, wherein the substrate is impregnated by pouring the liquid resin onto only the upper side thereof.
Claim 10
Dependent Claim
23 words
A process according to claim 1, wherein the resin composition is capable of heat curing and the uncured sandwich is cured by heating.
Claim 11
Dependent Claim
20 words
A process according to claim 1, wherein the fibrous substrate is paper having a moisture content of less than 2%.
Claim 12
Dependent Claim
23 words
A process according to claim 10, wherein the paper substrate is continuously dried in a heating step prior to impregnation with the resin.
Claim 13
Dependent Claim
103 words
A process according to claim 10, further comprising pre-impregnating the paper substrate with an effective amount of up to 50% by weight of a composition selected from the group consisting of: (a) acrylate or methacrylate comonomers to increase resin impregnation speed; (b) polyethylene glycol to increase the impact strength of the finished resin laminate; (c) a solution of thermosetting resin or a prepolymer thereof to reduce moisture pick-up in the finished laminate; (d) a cellulose acylating agent to retard moisture pick-up of a hydrophilic substrate material; and (e) inorganic fillers and drying the pre-impregnated substrate when it is (b), (c), (d), or (e).
Claim 14
Dependent Claim
22 words
A process according to claim 10, wherein the substrate is impregnated by pouring the liquid resin onto only the upper side thereof.
Claim 15
Dependent Claim
14 words
A process according to claim 10, wherein the resin is an unsaturated polyester resin.
Claim 16
Dependent Claim
23 words
A process according to claim 14, wherein the resin composition is capable of heat curing and the uncured sandwich is cured by heating.
Claim 17
Dependent Claim
37 words
A process according to claim 15, wherein the polyester resin composition comprises (a) a condensate of a polyhydric alcohol with an unsaturated polycarboxylic acid and a saturated polycarboxylic acid, and (b) an ethylenically unsaturated, non-volatile crosslinking monomer.
Claim 18
Dependent Claim
12 words
A process according to claim 16, wherein the crosslinking monomer is styrene.
Claim 19
Dependent Claim
42 words
A process according to claim 17, wherein the substrate is five sheets of paper having a weight basis of about 150 g/m 2 , an air dried density of about 0.53 g/cm 3 , and a mean thickness of about 280 μm.
Claim 20
Dependent Claim
94 words
A process according to claim 18, wherein the resin composition consists essentially of (a) about 100 parts of liquid unsaturated polyester resin containing maleic acid:isophthalic acid:ethylene glycol in a molar ratio of about 82:18:100, a styrene monomer content of about 37%, and a viscosity at 25° C. of about 5 poise; (b) one part t-butylperoxy-2-ethylhexanoate; and (c) 0.2 parts 6% cobalt naphthenate, which is cured to a polyester resin film having a flexural modulus of 283 kg/mm 2 , a Rockwell hardness of about 106, and a glass transition temperature of about 90° C.
Claim 21
Dependent Claim
22 words
A process according to claim 18, further comprising pre-impregnating the substrate with an aqueous solution of methylolmelamine and drying the pre-impregnated substrate.
Claim 22
Dependent Claim
94 words
A process according to claim 20, wherein the resin composition consists essentially of (a) about 100 parts of liquid unsaturated polyester resin containing maleic acid:isophthalic acid:ethylene glycol in a molar ratio of about 82:18:100, a styrene monomer content of about 37%, and a viscosity at 25° C. of about 5 poise; (b) one part t-butylperoxy-2-ethylhexanoate; and (c) 0.2 parts 6% cobalt naphthenate, which is cured to a polyester resin film having a flexural modulus of 283 kg/mm 2 , a Rockwell hardness of about 106, and a glass transition temperature of about 90° C.
Claim 23
Dependent Claim
14 words
A process according to claim 1, wherein the fibrous substrate is a glass fabric.
Claim 24
Dependent Claim
97 words
A process according to claim 22, further comprising pre-impregnating the glass fabric substrate with an effective amount of up to 50% by weight of a composition selected from the group consisting of: (a) a silane coupling agent to improve the adhesion of the substrate to the resin; (b) ethylenically unsaturated aliphatic carboxylic acids to improve impregnation of the substrate with unsaturated polyester resin; (c) a curing catalyst followed by drying and pre-impregnation with epoxy resin free of the curing catalyst to prolong the pot life of liquid resin; and (d) inorganic fillers and drying the pre-impregnated substrate.
Claim 25
Dependent Claim
22 words
A process according to claim 22, wherein the substrate is impregnated by pouring the liquid resin onto only the upper side thereof.
Claim 26
Dependent Claim
13 words
A process according to claim 22, wherein the resin is an epoxy resin.
Claim 27
Dependent Claim
23 words
A process according to claim 25, wherein the resin composition is capable of heat curing and the uncured sandwich is cured by heating.
Claim 28
Dependent Claim
31 words
A process according to claim 26, wherein the epoxy resin is selected from the group consisting of Bisphenol A epoxy resins, Bisphenol F epoxy resins, epoxy novoloc resins, and mixtures thereof.
Claim 29
Dependent Claim
15 words
A process according to claim 24, wherein the substrate comprises eight plies of fiberglass fabric.
Claim 30
Dependent Claim
62 words
A process according to claim 28, wherein the epoxy resin composition consists essentially of 100 parts of a Bisphenol A type epoxy resin, 80 parts of methyl tetrahydrophthalic anhydride, and 0.5 parts of N,N-dimethylbenzylamine having a viscosity at 25° C. of about 6.5 poises, and wherein both sides of the sandwich are coated with an electrolytic copper foil to form the laminate.
Claim 31
Dependent Claim
67 words
A process according to claim 1, wherein step (b) is conducted by continuously combining the resin-impregnated substrate sheets into a continuous, unitary, multiple ply uncured laminate sheet by passage through a first pair of laminating rollers and continuously forming the uncured laminate sheet and cover sheets into a sandwich of a desired thickness by passage through a second pair of laminating rollers while the resin is uncured.
References Cited (Backward Citations)
US2596162A
Cited
US2517698A
Cited
US2537311A
Cited
US2632744A
Cited
US2985615A
Cited
US2750320A
Cited
US3236714A
Cited
US3508983A
Cited
US3902951A
Cited
US3676252A
Cited
US3810816A
Cited
US4012267A
Cited
US4075236A
Cited
US4075236B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |