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Patent US4024305A successfully refreshed from Google Patents.
US4024305A
Expired / Lapsed
US
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Method for producing a resin rich epoxy prepreg and laminate
Assignee: International Business Machines Corp
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Filing: 1975-06-04
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Granted: 1977-05-17
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Expires: 1995-06-04
Abstract
Abstract A method for producing a resin rich epoxy-glass prepreg and laminate wherein the epoxy-glass prepreg is given a first pass through an impregnation tower and impregnated with dicyandiamide cured brominated bisphenol type epoxy modified with a polyfunctional additive and advanced to 80-85% of complete cure. The prepreg is given a second pass through the tower and given a dip coating of, for example, brominated bisphenol A which is advanced to 80-85% of complete cure. The resulting prepreg serves as the outer sheet of a multi-layer printed circuit board and it has a resin rich surface necessary for chemical roughening and subsequent additive plating.
Inventors
- 👤 Warren Alan Alpaugh
- 👤 William Joseph Summa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:47
CPC Classifications
B; B29; B29B; B29B15/00; B29B15/08; B29B15/10; B29B15/12; B29B15/122; B29B15/125; C; C08; C08J; C08J5/00; C08J5/24; C08J5/241; C08J5/244; C08J5/249; C23; C23C; C23C18/00; C23C18/16; C23C18/18; C23C18/20; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; B29C; B29C2791/00; B29C2791/001; B29K; B29K2105/00; B29K2105/24; B29K2105/243; C08J2363/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
97 words
A method for making a resin rich epoxy prepreg suitable for subsequent chemical roughening and additive plating which comprises: impregnating a glass fabric with a first resin of a dicyandiamide cured brominated bisphenol type epoxy modified with a polyfunctional epoxidized novolac; curing said first resin impregnation to 80-85% of complete cure; coating the impregnated fabric with a second dicyandiamide cured epoxy resin selected from the group of epoxy resins consisting of (1) bisphenol A type, (2) brominated bisphenol A and (3) polyester modified bisphenol A; and curing said coating of second resin to 80-85% of complete cure.
Claim 2
Independent Claim
97 words
A method for making a resin rich epoxy prepreg suitable for subsequent chemical roughening and additive plating which comprises: impregnating a glass fabric with a first resin of a dicyandiamide cured brominated bisphenol type epoxy modified with a polyfunctional epoxidized novolac; curing said first resin impregnation to 80-85% of complete cure; coating the impregnated fabric with a second dicyandiamide cured epoxy resin selected from the group of epoxy resins consisting of (1) bisphenol A type, (2) brominated bisphenol A and (3) polyester modified bisphenol A; and curing said coating of second resin to 80-85% of complete cure.
Claim 3
Independent Claim
110 words
A method for making a resin rich epoxy prepreg suitable for subsequent chemical roughening and additive plating which comprises: impregnating a glass fabric with a first resin of a dicyandiamide cured brominated bisphenol type epoxy modified with a polyfunctional epoxidized novolac; curing said first resin impregnation to 80-85% of complete cure; coating the impregnated fabric with a second dicyandiamide cured epoxy resin selected from the group of epoxy resins consisting of (1) bisphenol A type, (2) brominated bisphenol A and (3) polyester modified bisphenol A; and curing said coating of second resin to 80-85% of complete cure to provide a resin rich prepreg having 70-80% resin and 20-30% glass fabric.
Claim 4
Independent Claim
110 words
A method for making a resin rich epoxy prepreg suitable for subsequent chemical roughening and additive plating which comprises: impregnating a glass fabric with a first resin of a dicyandiamide cured brominated bisphenol type epoxy modified with a polyfunctional epoxidized novolac; curing said first resin impregnation to 80-85% of complete cure; coating the impregnated fabric with a second dicyandiamide cured epoxy resin selected from the group of epoxy resins consisting of (1) bisphenol A type, (2) brominated bisphenol A and (3) polyester modified bisphenol A; and curing said coating of second resin to 80-85% of complete cure to provide a resin rich prepreg having 70-80% resin and 20-30% glass fabric.
Claim 5
Independent Claim
109 words
A method for making a resin rich epoxy prepreg suitable for subsequent chemical roughening and additive plating which comprises: impregnating a glass fabric with a first resin of a dicyandiamide cured brominated bisphenol type epoxy modified with a polyfunctional epoxidized novolac; curing said first resin impregnation to 80-85% of complete cure by drying in a temperature range of 250° F - 325° F for 4-5 minutes; coating the impregnated fabric with a second resin of a dicyandiamide cured brominated bisphenol A type; and curing said coating of second resin to 80-85% of complete cure by drying in a temperature range of 250° F - 325° F for 4-5 minutes.
Claim 6
Independent Claim
109 words
A method for making a resin rich epoxy prepreg suitable for subsequent chemical roughening and additive plating which comprises: impregnating a glass fabric with a first resin of a dicyandiamide cured brominated bisphenol type epoxy modified with a polyfunctional epoxidized novolac; curing said first resin impregnation to 80-85% of complete cure by drying in a temperature range of 250° F - 325° F for 4-5 minutes; coating the impregnated fabric with a second resin of a dicyandiamide cured brominated bisphenol A type; and curing said coating of second resin to 80-85% of complete cure by drying in a temperature range of 250° F - 325° F for 4-5 minutes.
Claim 7
Dependent Claim
18 words
The method as defined in claim 3 wherein said second resin is a dicyandiamide cured bisphenol A type.
Claim 8
Dependent Claim
20 words
The method as defined in claim 3 wherein said second resin is a dicyandiamide cured polyester modified bisphenol A type.
Claim 9
Independent Claim
152 words
A method for making a resin rich epoxy prepreg suitable for subsequent chemical roughening and additive plating which comprises: impregnating a glass fabric with a first resin of a dicyandiamide cured brominated bisphenol type epoxy modified with an epoxidized novolac; curing said first resin impregnation to 80-85% of complete cure for 4-5 minutes by solvent removal at a temperature range of 245° F - 255° F and polymerization at a temperature range of 320° F - 330° F; coating the impregnated fabric with a second dicyandiamide cured epoxy resin selected from the group of epoxy resins consisting of (1) bisphenol A type, (2) brominated bisphenol A and (3) polyester modified bisphenol A; and curing said coating of second resin to 80-85% of complete cure for 4-5 minutes by solvent removal at a temperature range of 245° F - 255° F and polymerization at a temperature range of 320° F - 330° F.
Claim 10
Independent Claim
152 words
A method for making a resin rich epoxy prepreg suitable for subsequent chemical roughening and additive plating which comprises: impregnating a glass fabric with a first resin of a dicyandiamide cured brominated bisphenol type epoxy modified with an epoxidized novolac; curing said first resin impregnation to 80-85% of complete cure for 4-5 minutes by solvent removal at a temperature range of 245° F - 255° F and polymerization at a temperature range of 320° F - 330° F; coating the impregnated fabric with a second dicyandiamide cured epoxy resin selected from the group of epoxy resins consisting of (1) bisphenol A type, (2) brominated bisphenol A and (3) polyester modified bisphenol A; and curing said coating of second resin to 80-85% of complete cure for 4-5 minutes by solvent removal at a temperature range of 245° F - 255° F and polymerization at a temperature range of 320° F - 330° F.
Claim 11
Independent Claim
100 words
A method for making a resin rich epoxy prepreg suitable for subsequent chemical roughening and additive plating which comprises: impregnating a glass fabric with a first resin of a dicyandiamide cured brominated bisphenol type epoxy modified with a polyfunctional tetrakis (hydroxyphenyl) ethane tetraglycidyl ether; curing said first resin impregnation to 80-85% of complete cure; coating the impregnated fabric with a second dicyandiamide cured epoxy resin selected from the group of epoxy resins consisting of (1) bisphenol A type, (2) brominated bisphenol A and (3) polyester modified bisphenol A; and curing said coating of second resin to 80-85% of complete cure.
Claim 12
Independent Claim
100 words
A method for making a resin rich epoxy prepreg suitable for subsequent chemical roughening and additive plating which comprises: impregnating a glass fabric with a first resin of a dicyandiamide cured brominated bisphenol type epoxy modified with a polyfunctional tetrakis (hydroxyphenyl) ethane tetraglycidyl ether; curing said first resin impregnation to 80-85% of complete cure; coating the impregnated fabric with a second dicyandiamide cured epoxy resin selected from the group of epoxy resins consisting of (1) bisphenol A type, (2) brominated bisphenol A and (3) polyester modified bisphenol A; and curing said coating of second resin to 80-85% of complete cure.
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) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |