US3855047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet-like nonwoven web and flexible article of polyester and aromatic polyamide staple fibers
Assignee: 3M Co
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Filing: 1973-01-05
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Granted: 1974-12-17
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Expires: 1993-01-05
Abstract
Abstract The disclosed laminate is suitable for use in the art of printed circuitry and comprises an electrically conductive layer and a nonwoven backing layer. The nonwoven backing has unusual dimensional stability under a wide variety of conditions and preferably comprises a blend of at least 15 wt. % polyester staple and at least 10 wt. % aromatic polyamide staple. This blend is impregnated with a thermosettable resin.
Inventors
- 👤 G Groff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:29
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0366; D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4326; D04H1/4334; D04H1/4342; D04H1/435; D04H1/4382; D04H1/43835; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/0145; H05K2201/02; H05K2201/0275; H05K2201/0278; H05K2201/0284; H05K2201/0293; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T442/00; Y10T442/20; Y10T442/2164; Y10T442/2475
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
78 words
A SHEET-LIKE NONWOVEN WEB INPREGNATED WITH AN ELECTRICALLY INSULATIVE, MONISTURE-INSENSITIVE THEREMOSET RESIN, SAID SHEET-LIKE NONWOVEN WEB BEING FORMED FROM A FIBER BLEND COMPRISING BETWEEN 15 AND 60 WEIGHT % UNDRAWN POLYESTER STAPLE FIBERS AT LEAST PARTIALLY HEAT SOFTENABLE AT TEMPERATURE BELOW 200*C. 0 UP TO 60 WEIGHT PERCENT DRAWN POLYESTER STAPLE FIBERS, AND, IN INTIMATE ADMIXTURE WITH SAID UNDRAWN POLYESTER STAPLE FIBERS, AT LEAST 10 BUT NO MORE THAB ABOUT 75 WEIGHT % DISCONTINUOUS AROMATIC POLYAMIDE STAPLE FIBERS.
Claim 2
Dependent Claim
78 words
A SHEET-LIKE NONWOVEN WEB INPREGNATED WITH AN ELECTRICALLY INSULATIVE, MONISTURE-INSENSITIVE THEREMOSET RESIN, SAID SHEET-LIKE NONWOVEN WEB BEING FORMED FROM A FIBER BLEND COMPRISING BETWEEN 15 AND 60 WEIGHT % UNDRAWN POLYESTER STAPLE FIBERS AT LEAST PARTIALLY HEAT SOFTENABLE AT TEMPERATURE BELOW 200*C. 0 UP TO 60 WEIGHT PERCENT DRAWN POLYESTER STAPLE FIBERS, AND, IN INTIMATE ADMIXTURE WITH SAID UNDRAWN POLYESTER STAPLE FIBERS, AT LEAST 10 BUT NO MORE THAB ABOUT 75 WEIGHT % DISCONTINUOUS AROMATIC POLYAMIDE STAPLE FIBERS.
Claim 3
Dependent Claim
22 words
A sheet-like nonwoven web according to claim 1 wherein said fiber blend contains 25-65 weight percent of said aromatic polyamide staple fibers.
Claim 4
Dependent Claim
52 words
A sheet-like nonwoven web according to claim 1 wherein said web is formed from a fiber blend comprising drawn and undrawn polyester staple fiber and heat resistant aromatic polyamide staple fiber, the amount of said drawn polyester staple fiber being no more than twice the amount of said undrawn polyester staple fiber.
Claim 5
Dependent Claim
119 words
A flexible, sheet-like article, said article being less than 20 mils in thickness and being at least as flexible as a 10-mil thick biaxially oriented poly (ethylene terephthalate) film said article comprising a sheet-like nonwoven web impregnated with an electrically insulative, moisture-insensitive thermoset resin, said sheet-like nonwoven web, prior to impregnation, having a Gurley value, ASTM Test D 726, Method A, of less than 100 seconds per 100 cc of air per 5 mils of thickness, said sheet-like nonwoven web comprising: 0 - 60 weight per cent drawn polyester staple fiber; 15 - 60 weight per cent undrawn polyester staple fiber, and 10 - 75 weight per cent aromatic polyamide staple fiber, said sheet-like nonwoven web being autogenously bonded.
Claim 6
Dependent Claim
119 words
A flexible, sheet-like article, said article being less than 20 mils in thickness and being at least as flexible as a 10-mil thick biaxially oriented poly (ethylene terephthalate) film said article comprising a sheet-like nonwoven web impregnated with an electrically insulative, moisture-insensitive thermoset resin, said sheet-like nonwoven web, prior to impregnation, having a Gurley value, ASTM Test D 726, Method A, of less than 100 seconds per 100 cc of air per 5 mils of thickness, said sheet-like nonwoven web comprising: 0 - 60 weight per cent drawn polyester staple fiber; 15 - 60 weight per cent undrawn polyester staple fiber, and 10 - 75 weight per cent aromatic polyamide staple fiber, said sheet-like nonwoven web being autogenously bonded.
Claim 7
Dependent Claim
28 words
An article according to claim 4 wherein the amount of said drawn polyester staple fiber is no greater than twice the amount of said undrawn polyester staple fiber.
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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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |