Patent US4479999A successfully refreshed from Google Patents.
US4479999A
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Fabric comprised of fusible and infusible fibers, the former comprising a polymer which is capable of forming an anisotropic melt phase
Assignee: Celanese Corp
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Filing: 1982-04-15
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Granted: 1984-10-30
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Expires: 2002-04-15
Abstract
Abstract An improved fabric is provided comprised of fusible and infusible fibers. The fusible fibers comprise thermotropic liquid crystal polymers (i.e., polymers which are capable of forming an anisotropic melt phase). When the liquid crystal fibers are heated, they fuse to adjacent infusible fibers without any substantial loss of the orientation which was imparted to the same during melt extrusion. A fabric of enhanced strength and stiffness is thus formed in comparison to a fabric which employs conventional thermoplastic polymers which do not form an anisotropic melt phase.
Inventors
- 👤 Alan Buckley
- 👤 Paul E. McMahon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:52
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/78; D01F6/84; D01F6/82; D04; D04H; D04H1/00; D04H1/40; D04H1/54; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/30; Y10T428/31504; Y10T428/31786; Y10T428/3179; Y10T442/00; Y10T442/30; Y10T442/3146; Y10T442/60; Y10T442/637
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
41 words
A fabric which exhibits thermal stability and chemical and solvent resistance comprised of fusible and infusible fibers, said fusible fibers being thermally bonded to said infusible fibers and comprised of a polymer which is capable of forming an anisotropic melt phase.
Claim 2
Dependent Claim
41 words
A fabric which exhibits thermal stability and chemical and solvent resistance comprised of fusible and infusible fibers, said fusible fibers being thermally bonded to said infusible fibers and comprised of a polymer which is capable of forming an anisotropic melt phase.
Claim 3
Dependent Claim
13 words
The fabric of claim 1 wherein said polymer is a wholly aromatic polymer.
Claim 4
Dependent Claim
13 words
The fabric of claim 1 wherein said polymer is a wholly aromatic polyester.
Claim 5
Dependent Claim
32 words
The fabric of claim 1 wherein said polymer exhibits an inherent viscosity of at least 2.0 dl./g. when dissolved in a concentration of 0.1 percent by weight in pentafluorophenol at 60° C.
Claim 6
Dependent Claim
24 words
The fabric of claim 1 wherein said polymer comprises not less than about 10 mole percent of recurring units which include a naphthalene moiety.
Claim 7
Dependent Claim
31 words
The fabric of claim 5 wherein said naphthalene moiety of said wholly aromatic polymer is selected from the group consisting of a 6-oxy-2-naphthoyl moiety, a 2,6-dioxynaphthalene moiety, and a 2,6-dicarboxynaphthalene moiety.
Claim 8
Dependent Claim
23 words
The fabric of claim 1 wherein said polymer is capable of forming an anisotropic melt phase at a temperature below approximately 400° C.
Claim 9
Dependent Claim
100 words
The fabric of claim 1 wherein said polymer comprises a melt processable wholly aromatic polyester which is capable of forming an anisotropic melt phase and consists essentially of the recurring moieties I, II, and III wherein: ##STR15## wherein said polyester comprises approximately 30 to 70 mole percent of moiety I and wherein at least some of the hydrogen atoms present upon the rings optionally may be replaced by substitution selected from the group consisting of an alkyl group of 1 to 4 carbon atoms, an alkoxy group of 1 to 4 carbon atoms, halogen, phenyl, substituted phenyl, and mixtures thereof.
Claim 10
Dependent Claim
37 words
The fabric of claim 8 wherein said polyester comprises approximately 40 to 60 mole percent of moiety I, approximately 20 to 30 mole percent of moiety II, and approximately 20 to 30 mole percent of moiety III.
Claim 11
Dependent Claim
109 words
The fabric of claim 1 wherein said polymer comprises a melt processable wholly aromatic polyester which is capable of forming a anisotropic melt phase and consists essentially of the recurring moieties I and II wherein: ##STR16## wherein said polyester comprises approximately 10 to 90 mole percent of moiety I, and approximately 10 to 90 mole percent of moiety II and wherein at least some of the hydrogen atoms present upon the rings optionally may be replaced by substitution selected from the group consisting of an alkyl group of 1 to 4 carbon atoms, an alkoxy group of 1 to 4 carbon atoms, halogen, phenyl, substituted phenyl, and mixtures thereof.
Claim 12
Dependent Claim
18 words
The fabric of claim 10 wherein said polyester comprises approximately 65 to 85 mole percent of moiety II.
Claim 13
Dependent Claim
18 words
The fabric of claim 10 wherein said polyester comprises approximately 15 to 35 mole percent of moiety II.
Claim 14
Dependent Claim
119 words
The fabric of claim 1 wherein said polymer comprises a melt processable wholly aromatic polyester which is capable of forming an anisotropic melt phase and consists essentially of the recurring moieties I, II, and III wherein: ##STR17## wherein said polyester comprises approximately 10 to 90 mole percent of moiety I, approximately 5 to 45 mole percent of moiety II, and approximately 5 to 45 mole percent of moiety III and wherein at least some of the hydrogen atoms present upon the rings optionally may be replaced by substitution selected from the group consisting of an alkyl group of 1 to 4 carbon atoms, an alkoxy group of 1 to 4 carbon atoms, halogen, phenyl, substituted phenyl, and mixtures thereof.
Claim 15
Dependent Claim
37 words
The fabric of claim 13 wherein said polyester comprises approximately 20 to 80 mole percent of moiety I, approximately 10 to 40 mole percent of moiety II, and approximately 10 to 40 mole percent of moiety III.
Claim 16
Dependent Claim
141 words
The fabric of claim 1 wherein said polymer comprises a melt processable wholly aromatic polyester which is capable of forming an anisotropic melt phase and consists essentially of the recurring moieties I, II, III and IV wherein: ##STR18## wherein the polyester comprises approximately 20 to 40 mole percent of moiety I, in excess of 10 up to about 50 mole percent of moiety II, in excess of 5 up to about 30 mole percent of moiety III, and in excess of 5 up to about 30 mole percent of moiety IV and wherein at least some of the hydrogen atoms present upon the rings optionally may be replaced by substitution selected from the group consisting of an alkyl group of 1 to 4 carbon atoms, an alkoxy group of 1 to 4 carbon atoms, halogen, phenyl, substituted phenyl, and mixtures thereof.
Claim 17
Dependent Claim
46 words
The fabric of claim 15 wherein said polyester comprises approximately 20 to 30 mole percent of moiety I, approximately 25 to 40 mole percent of moiety II, approximately 15 to 25 mole percent of moiety III and approximately 15 to 25 mole percent of moiety IV.
Claim 18
Dependent Claim
129 words
The fabric of claim 1 wherein said polymer comprises a melt processable poly(ester-amide) which is capable of forming an anisotropic melt phase and consists essentially of the recurring moieties I, II, III and optionally IV wherein: ##STR19## and wherein said poly(ester-amide) comprises approximately 10 to 90 mole percent of moiety I, approximately 5 to 45 mole percent of moiety II, approximately 5 to 45 mole percent of moiety III, and approximately 0 to 40 mole percent of moiety IV and wherein at least some of the hydrogen atoms present upon the rings optionally may be replaced by substitution selected from the group consisting of an alkyl group of 1 to 4 carbon atoms, an alkoxy group of 1 to 4 carbon atoms, halogen, phenyl, substituted phenyl, and mixtures thereof.
Claim 19
Dependent Claim
40 words
The fabric of claim 1 wherein said polymer has been subjected to a heat treatment for a period of time and at a temperature sufficient to increase the melting temperature of the polymer between about 20 to 50 centigrade degrees.
Claim 20
Dependent Claim
20 words
The fabric of claim 18 wherein said polymer has been subjected to a heat treatment after formation of said fabric.
Claim 21
Dependent Claim
26 words
The fabric of claim 18 wherein said heat treatment temperature ranges from about 10 to about 30 centigrade degrees below the melting temperature of the polymer.
Claim 22
Dependent Claim
18 words
The fabric of claim 20 wherein said period of time ranges from about 0.5 to about 200 hours.
Claim 23
Dependent Claim
18 words
The fabric of claim 21 wherein said period of time ranges from about 1 to about 48 hours.
Claim 24
Dependent Claim
18 words
The fabric of claim 22 wherein said period of time ranges from about 5 to about 30 hours.
Claim 25
Dependent Claim
14 words
The fabric of claim 18 wherein said heat treatment occurs in a non-oxidizing atmosphere.
Claim 26
Dependent Claim
11 words
The fabric of claim 24 wherein said atmosphere is substantially moisture-free.
Claim 27
Dependent Claim
14 words
The fabric of claim 24 wherein said heat treatment occurs in a nitrogen atmosphere.
Claim 28
Dependent Claim
13 words
The fabric of claim 1 which is in the form of a sheet.
Claim 29
Dependent Claim
20 words
The fabric of claim 1 wherein said infusible fibers are in the form of a woven web of said fibers.
Claim 30
Dependent Claim
18 words
The fabric of claim 1 wherein said infusible and fusible fibers are woven together to form said fabric.
Claim 31
Dependent Claim
32 words
The fabric of claim 1 wherein said fabric is formed by spray spinning said fusible fibers onto a web of infusible fibers and thermally bonding said fusible fibers to said infusible fibers.
Claim 32
Dependent Claim
34 words
The fabric of claim 1 wherein said fabric is formed by filtering a slurry of fusible and infusible fibers onto a web or screen and thermally bonding said fusible fibers to said infusible fibers.
Claim 33
Dependent Claim
23 words
The fabric of claim 1 wherein said infusible fibers are selected from the group consisting of carbon fibers, glass fibers and asbestos fibers.
Claim 34
Dependent Claim
12 words
The fabric of claim 32 wherein said infusible fibers are carbon fibers.
Claim 35
Dependent Claim
30 words
The fabric of claim 1 comprised of from about 5 to about 80 weight percent of infusible fibers and between about 95 to about 20 weight percent of fusible fibers.
References Cited (Backward Citations)
GB1228573A
Cited
US3620892A
Cited
US3975487A
Cited
US4183895A
Cited
US4368234A
Cited
US4362777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-30 | 1988-04-30 | 1988-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-30 | 1992-04-30 | 1992-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-30 | 1996-04-30 | 1996-10-30 | $7700.00 | Window Closed / Lapsed |