US5049435A
Expired / Lapsed
US
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Flexible sheet reinforced with poly(aromatic amide) non-woven fabric and use thereof
Assignee: Toyobo Co Ltd
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Filing: 1989-10-02
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Granted: 1991-09-17
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Expires: 2009-10-02
Abstract
Abstract A flexible sheet which comprises a non-woven fabric made predominantly from a poly(aromatic amide) component which is impregnated with a heat- and/or light-curable resin, wherein the non-woven fabric satisfies the following conditions: 5 g/m 2 <weight per unit area<35 g/m 2 , and 0.15 g/cm 3 ≦density≦0.8 g/cm 3 , which has well balanced properties, such as excellent heat dimensional stability, heat resistance (soldering resistance), water resistance, solvent resistance, electrical insulating properties and mechanical properties and is useful for the preparation of a flexible printed circuit board, and use thereof for a flexible metal-clad laminate and a flexible printed circuit board.
Inventors
- 👤 Keiichi Uno
- 👤 Yoshimi Ishinami
- 👤 Masaaki Nakamura
- 👤 Tomohiko Nakao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:15
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0326; D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4326; D04H1/4334; D04H1/4342; D04H1/4382; D04H1/43835; D04H1/58; D04H1/587; D04H1/64; H05K1/0353; H05K1/0366; H05K2201/00; H05K2201/02; H05K2201/0275; H05K2201/0278; H05K2201/0293; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10S428/902; Y10S428/92; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/24995; Y10T428/249951; Y10T428/27; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31725; Y10T428/31736; Y10T442/00; Y10T442/20; Y10T442/2861; Y10T442/60; Y10T442/654; Y10T442/656
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
A flexible sheet which comprises a non-woven fabric made from 60% by weight or more of a poly(aromatic amide) component which is impregnated with a heat- and/or light-curable resin, wherein the non-woven fabric satisfies the following conditions: 5 g/m 2 <weight per unit area<35 g/cm 2 , and 0.15 g/cm 3 ≦density≦0.8 g/cm 3 said poly(aromatic amide) component comprising chopped fibers of an aromatic homopolyamide or copolyamide composed of the following units: --HN--R.sub.1 --NHOCR.sub.2 CO--, formula (1) or --HN--R.sub.3 --CO-- formula (2) wherein R 1 , R 2 , and R 3 are each substituted or unsubstituted aromatic group selected from ##STR6## and any substituent on the aromatic group is a member selected from the group consisting of an alkyl having 1 to 3 carbon atoms, chlorine atom, bromine atom and phenyl.
Claim 2
Dependent Claim
132 words
A flexible sheet which comprises a non-woven fabric made from 60% by weight or more of a poly(aromatic amide) component which is impregnated with a heat- and/or light-curable resin, wherein the non-woven fabric satisfies the following conditions: 5 g/m 2 <weight per unit area<35 g/cm 2 , and 0.15 g/cm 3 ≦density≦0.8 g/cm 3 said poly(aromatic amide) component comprising chopped fibers of an aromatic homopolyamide or copolyamide composed of the following units: --HN--R.sub.1 --NHOCR.sub.2 CO--, formula (1) or --HN--R.sub.3 --CO-- formula (2) wherein R 1 , R 2 , and R 3 are each substituted or unsubstituted aromatic group selected from ##STR6## and any substituent on the aromatic group is a member selected from the group consisting of an alkyl having 1 to 3 carbon atoms, chlorine atom, bromine atom and phenyl.
Claim 3
Dependent Claim
38 words
The flexible sheet of claim 1 wherein said non-woven fabric is made from 97 to 20% by weight of said chopped fibers consisting predominantly of aromatic polyamide or copolyamide and from 3 to 80% by weight of binder.
Claim 4
Dependent Claim
31 words
The flexible sheet of claim 1 wherein said chopped fibers consist of chopped fibers of a polymer selected from the group consisting of poly(m-benzamide), poly(m-phenylene isophthalamide), poly(m,m'-phenylene benzamide), and poly(1,6-naphthylene isophthalamide).
Claim 5
Dependent Claim
16 words
The flexible sheet of claim 3, wherein said chopped fibers consist of poly(m-phenylene isophthalamide) chopped fibers.
Claim 6
Dependent Claim
144 words
A flexible metal-clad laminate which comprises a metal layer and a base sheet, said base sheet comprising a non-woven fabric made from 60% by weight or more of a poly(aromatic amide) component which is impregnated with a heat- and/or light-curable resin, wherein the non-woven fabric satisfies the following conditions: 5 g/m 2 <weight per unit area<35 g/cm 2 , and 0.15 g/cm 3 ≦density≦0.8 g/cm 3 , said poly(aromatic amide) component comprising chopped fibers of an aromatic homopolyamide or copolyamide composed of the following unit: --HN--R.sub.1 --NHOCR.sub.2 CO--, formula (1) or --HN--R.sub.3 --CO-- formula (2) wherein R 1 , R 2 and R 3 are each substituted or unsubstituted aromatic group selected from ##STR7## and any substituent on the aromatic group is a member selected from the group consisting of an alkyl having 1 to 3 carbon atoms, chlorine atom, bromine atom and phenyl.
Claim 7
Dependent Claim
144 words
A flexible metal-clad laminate which comprises a metal layer and a base sheet, said base sheet comprising a non-woven fabric made from 60% by weight or more of a poly(aromatic amide) component which is impregnated with a heat- and/or light-curable resin, wherein the non-woven fabric satisfies the following conditions: 5 g/m 2 <weight per unit area<35 g/cm 2 , and 0.15 g/cm 3 ≦density≦0.8 g/cm 3 , said poly(aromatic amide) component comprising chopped fibers of an aromatic homopolyamide or copolyamide composed of the following unit: --HN--R.sub.1 --NHOCR.sub.2 CO--, formula (1) or --HN--R.sub.3 --CO-- formula (2) wherein R 1 , R 2 and R 3 are each substituted or unsubstituted aromatic group selected from ##STR7## and any substituent on the aromatic group is a member selected from the group consisting of an alkyl having 1 to 3 carbon atoms, chlorine atom, bromine atom and phenyl.
Claim 8
Dependent Claim
39 words
The flexible metal-clad laminate of claim 5 wherein said non-woven fabric is made from 97 to 20% by weight of said chopped fibers consisting predominantly or aromatic polyamide or copolyamide and from 3 to 80% by weight of binder.
Claim 9
Dependent Claim
156 words
In a flexible printed circuit board wherein a flexible sheet is used as a base sheet and/or a covering layer, the improvement which comprises that the flexible sheet comprises a non-woven fabric made from 60% by weight or more of a poly(aromatic amide) component which is impregnated with a heat- and/or light-curable resin, wherein the non-woven fabric satisfies the following conditions: 5 g/m 2 <weight per unit area<35 g/cm 2 , and 0.15 g/cm 3 ≦density≦0.8 g/cm 3 , said poly(aromatic amide) component comprising chopped fibers of an aromatic homopolyamide or copolyamide composed of the following unit: --HN--R.sub.1 --NHOCR.sub.2 CO--, formula (1) or --HN--R.sub.3 --CO-- formula (2) wherein R 1 , R 2 and R 3 are each substituted or unsubstituted aromatic group selected from ##STR8## and any substituent on the aromatic group is a member selected from the group consisting of an alkyl having 1 to 3 carbon atoms, chlorine atom, bromine atom and phenyl.
Claim 10
Dependent Claim
156 words
In a flexible printed circuit board wherein a flexible sheet is used as a base sheet and/or a covering layer, the improvement which comprises that the flexible sheet comprises a non-woven fabric made from 60% by weight or more of a poly(aromatic amide) component which is impregnated with a heat- and/or light-curable resin, wherein the non-woven fabric satisfies the following conditions: 5 g/m 2 <weight per unit area<35 g/cm 2 , and 0.15 g/cm 3 ≦density≦0.8 g/cm 3 , said poly(aromatic amide) component comprising chopped fibers of an aromatic homopolyamide or copolyamide composed of the following unit: --HN--R.sub.1 --NHOCR.sub.2 CO--, formula (1) or --HN--R.sub.3 --CO-- formula (2) wherein R 1 , R 2 and R 3 are each substituted or unsubstituted aromatic group selected from ##STR8## and any substituent on the aromatic group is a member selected from the group consisting of an alkyl having 1 to 3 carbon atoms, chlorine atom, bromine atom and phenyl.
Claim 11
Dependent Claim
40 words
The flexible printed circuit board of claim 7 wherein said non-woven fabric is made from 97 to 20% by weight of said chopped fibers consisting predominantly of aromatic polyamide or copolyamide and from 3 to 80% by weight of binder.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-09-16 | 1995-03-18 | 1995-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-16 | 1999-03-18 | 1999-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-16 | 2003-03-18 | 2003-09-17 | $7700.00 | Window Closed / Lapsed |