US4963428A
Expired / Lapsed
US
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Biaxially oriented ordered polymer films
Assignee: Albany International Research Co
•
Filing: 1988-06-13
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Granted: 1990-10-16
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Expires: 2008-06-13
Abstract
Abstract This invention relates in general to the formation of multiaxially (e.g., biaxially) oriented films from high molecular weight lyotropic or thermotropic polymers (homopolymers, copolymers, and the like), wherein due to the processing conditions employed, the films have a controlled molecular orientation. The films of the present invention are preferably prepared from rod-like extended-chain, aromatic- heterocyclic polymers. These polymers generally fall into two classes; first, those that are modified in solution form, i.e., lyotropic liquid crystalline polymers; and second, those that are modified by temperature changes, i.e., thermotropic liquid crystalline polymers. For a shorthand expression covering both types of polymers, the present disclosure will use the term "ordered polymers.
Inventors
- 👤 Andrew C. Harvey
- 👤 Richard W. Lusignea
- 👤 James L. Racich
- 👤 Dirk M. Baars
- 👤 Donald D. Bretches
- 👤 Robert B. Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:03
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/005; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/10; B29C48/25; B29C48/30; B29C48/305; B29C48/32; B29C48/33; B29C48/35; B29C48/88; B29C48/919; B29C55/02; B29C55/10; B29C55/12; B29C67/00; B29C67/24; B29C48/06; B29K; B29K2079/00; B29K2081/00; B29K2105/00; B29K2105/0079; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/31
Claims Analysis
Total Claims: 47
Claim 1
Independent Claim
46 words
A film having a controllable coefficient of thermal expansion, selected from negative, positive, or zero in any plane of the film and a thickness of at least about 0.10 mm, prepared from a molecularly ordered lyotropic liquid crystalline polymer, said film having a multiaxial molecular orientation.
Claim 2
Dependent Claim
46 words
A film having a controllable coefficient of thermal expansion, selected from negative, positive, or zero in any plane of the film and a thickness of at least about 0.10 mm, prepared from a molecularly ordered lyotropic liquid crystalline polymer, said film having a multiaxial molecular orientation.
Claim 3
Dependent Claim
14 words
The film of claim 1, wherein the thickness is at least about 0.20 mm.
Claim 4
Dependent Claim
14 words
The film of claim 2, wherein the multiaxial molecular orientation is nearly balanced biaxial.
Claim 5
Dependent Claim
16 words
The film of claim 2, or 3, wherein the lyotropic liquid crystalline polymer is poly-(-phenylene benzobisoxazole.
Claim 6
Dependent Claim
46 words
A film having a controllable coefficient of thermal expansion, selected from negative, positive, or zero in any plane of the film and a thickness of less than about 0.10 mm, prepared from a molecularly ordered lyotropic liquid crystalline polymer, said film having a multiaxial molecular orientation.
Claim 7
Dependent Claim
46 words
A film having a controllable coefficient of thermal expansion, selected from negative, positive, or zero in any plane of the film and a thickness of less than about 0.10 mm, prepared from a molecularly ordered lyotropic liquid crystalline polymer, said film having a multiaxial molecular orientation.
Claim 8
Dependent Claim
14 words
The film of claim 5, wherein the multiaxial molecular orientation is nearly balanced biaxial.
Claim 9
Dependent Claim
16 words
The film of claim 6 or 7, wherein the lyotropic liquid crystalline polymer is poly-(-phenylene benzobisoxazole.
Claim 10
Dependent Claim
46 words
A film having a controllable coefficient of thermal expansion, selected from negative, positive, or zero in any plane of the film and a thickness of at least about 0.10 mm, prepared from a molecularly ordered thermotropic liquid crystalline polymer, said film having a multiaxial molecular orientation.
Claim 11
Dependent Claim
46 words
A film having a controllable coefficient of thermal expansion, selected from negative, positive, or zero in any plane of the film and a thickness of at least about 0.10 mm, prepared from a molecularly ordered thermotropic liquid crystalline polymer, said film having a multiaxial molecular orientation.
Claim 12
Dependent Claim
14 words
The film of claim 8, wherein the thickness is at least about 0.20 mm.
Claim 13
Dependent Claim
14 words
The film of claim 9, wherein the multiaxial molecular orientation is nearly balanced biaxial.
Claim 14
Dependent Claim
18 words
The film of claim 8, 9, or 10, wherein the thermotropic liquid crystalline polymer has the structure: ##STR5##
Claim 15
Dependent Claim
46 words
A film having a controllable coefficient of thermal expansion, selected from negative, positive, or zero in any plane of the film and a thickness of less than about 0.10 mm, prepared from a molecularly ordered thermotropic liquid crystalline polymer, said film having a multiaxial molecular orientation.
Claim 16
Dependent Claim
46 words
A film having a controllable coefficient of thermal expansion, selected from negative, positive, or zero in any plane of the film and a thickness of less than about 0.10 mm, prepared from a molecularly ordered thermotropic liquid crystalline polymer, said film having a multiaxial molecular orientation.
Claim 17
Dependent Claim
14 words
The film of claim 12, wherein the multiaxial molecular orientation is nearly balanced biaxial.
Claim 18
Dependent Claim
17 words
The film of claim 12 or 13, wherein the thermotropic liquid crystalline polymer has the structure: ##STR6##
Claim 19
Dependent Claim
46 words
A film having a controllable coefficient of thermal expansion, selected from negative, positive, or zero in any plane of the film and a thickness of at least about 0.10 mm, prepared from a molecularly ordered thermotropic liquid crystalline polymer, said film having a multiaxial molecular orientation.
Claim 20
Dependent Claim
46 words
A film having a controllable coefficient of thermal expansion, selected from negative, positive, or zero in any plane of the film and a thickness of at least about 0.10 mm, prepared from a molecularly ordered thermotropic liquid crystalline polymer, said film having a multiaxial molecular orientation.
Claim 21
Dependent Claim
14 words
The film of claim 15, wherein the thickness is at least about 0.20 mm.
Claim 22
Dependent Claim
14 words
The film of claim 16, wherein the multiaxial molecular orientation is nearly balanced biaxial.
Claim 23
Dependent Claim
18 words
The film of claim 15, 16, or 17, wherein the thermotropic liquid crystalline polymer has the structure: ##STR7##
Claim 24
Dependent Claim
61 words
The film of claim 1, 2 or 3, wherein the ordered lyotropic liquid crystalline polymer is a para-ordered, aromatic heterocyclic polymer, an ordered, linear, crystalline polymer containing aliphatic, cycloaliphatic and aralphatic moieties, a para-ordered aromatic heterocyclic polymer having diphenoxybenzene swivel sections in the polymer chain, a para-ordered aromatic heterocyclic polymer containing phenyl groups along the polymer chain backbone, or p-phenylenebenzo bisthiazole.
Claim 25
Independent Claim
73 words
A method of preparing a multiaxially oriented film from a lyotropic liquid crystalline polymer, the film having a controllable coefficient of thermal expansion, selected from negative, positive, or zero in any direction in the plane of the film, comprising the steps of: (a) subjecting a dope containing said polymer to at least two cross-directional strain forces; and (b) solidifying the microscale structural orientation formed in step (a) by physical, chemical or thermal means.
Claim 26
Independent Claim
73 words
A method of preparing a multiaxially oriented film from a lyotropic liquid crystalline polymer, the film having a controllable coefficient of thermal expansion, selected from negative, positive, or zero in any direction in the plane of the film, comprising the steps of: (a) subjecting a dope containing said polymer to at least two cross-directional strain forces; and (b) solidifying the microscale structural orientation formed in step (a) by physical, chemical or thermal means.
Claim 27
Dependent Claim
13 words
The method of claim 20, wherein the multiaxial orientation is nearly balanced biaxial.
Claim 28
Dependent Claim
16 words
The method of claim 20 or 21, wherein the lyotropic liquid crystalline polymer is poly-phenylene benzobisoxazole.
Claim 29
Independent Claim
76 words
A method of preparing a multiaxially oriented film from a thermotropic liquid crystalline polymer, the film having a controllable coefficient of thermal expansion, selected from negative, positive or zero in any direction in the plane of the film, the method, comprising the steps of: (a) subjecting a polymer melt of said polymer to at least two cross-directional strain forces; and (b) solidifying the microscale structural orientation formed in step (a) by physical, chemical or thermal means.
Claim 30
Independent Claim
76 words
A method of preparing a multiaxially oriented film from a thermotropic liquid crystalline polymer, the film having a controllable coefficient of thermal expansion, selected from negative, positive or zero in any direction in the plane of the film, the method, comprising the steps of: (a) subjecting a polymer melt of said polymer to at least two cross-directional strain forces; and (b) solidifying the microscale structural orientation formed in step (a) by physical, chemical or thermal means.
Claim 31
Dependent Claim
13 words
The method of claim 20, wherein the multiaxial orientation is nearly balanced biaxial.
Claim 32
Dependent Claim
15 words
The method of claim 23 or 24, wherein the thermotropic polymer has the formula: ##STR8##
Claim 33
Dependent Claim
15 words
The method of claim 23 or 24, wherein the thermotropic polymer has the formula: ##STR9##
Claim 34
Dependent Claim
24 words
The film of claim 1, 2 or 4, wherein the multiaxial molecular orientation is balanced biaxial at about ±45 degrees to film machine direction.
Claim 35
Dependent Claim
23 words
The film of claim 5 or 7, wherein the multiaxial molecular orientation is balanced biaxial at about ±45 degrees to film machine direction.
Claim 36
Dependent Claim
23 words
The film of claim 8 or 9, wherein the multiaxial molecular orientation is balanced biaxial at about ±45 degrees to film machine direction.
Claim 37
Dependent Claim
23 words
The film of claim 12 or 15, wherein the multiaxial molecular orientation is balanced biaxial at about ±45 degrees to film machine direction.
Claim 38
Dependent Claim
19 words
The method of claim 20 or 23, wherein the film has a thickness of at least about 0.10 mm.
Claim 39
Dependent Claim
19 words
The method of claim 20 or 23, wherein the film has a thickness of at least about 0.20 mm.
Claim 40
Dependent Claim
18 words
The method of claim 20 or 23, wherein the film has a thickness of less than 0.10 mm.
Claim 41
Dependent Claim
37 words
The method of claim 20, wherein the dope is subjected to a first cross-directional strain force comprising transverse shear field extrusion, and wherein the discharged dope is subjected to second cross-directional strains comprising transverse and longitudinal extensions.
Claim 42
Dependent Claim
41 words
The method of claim 33, wherein the first cross-directional strain force comprises transverse shear imparted by counter-rotating members selected from counter-rotating dies, counter-rotating plates, and counter-rotating pinch rolls or belts, as the dope is passed through and discharged from the members.
Claim 43
Dependent Claim
44 words
The method of claim 34, wherein the second cross-directional strain force is imparted by simultaneously stretching the discharged dope transversely and drawing down the discharged dope at a linear rate greater than the rate at which the dope is discharged from the counter-rotating member.
Claim 44
Dependent Claim
36 words
The method of claim 34, 35 or 36 wherein the shear stress applied to the film during manufacture is sufficient to produce film having an ultimate tensile strength in any direction of at least 40,000 psi.
Claim 45
Dependent Claim
38 words
The method of claim 34, 35 or 36 wherein the shear stress applied to the film during manufacture is sufficient to produce films having an ultimate tensile stress of at least 100,000 psi in at least one direction.
Claim 46
Dependent Claim
36 words
The method of claim 34, 35 or 36 wherein the shear stress applied to the film during manufacture is sufficient to produce film having a tensile modulus in any direction of at least 8×10 5 psi.
Claim 47
Dependent Claim
38 words
The method of claim 34, 35 or 36, wherein the shear stress applied to the film during manufacture is sufficient to produce film having a tensile modulus of at least 5×10 6 psi in at least one direction.
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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) | 1993-10-15 | 1994-04-16 | 1994-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-15 | 1998-04-16 | 1998-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-15 | 2002-04-16 | 2002-10-16 | $7700.00 | Window Closed / Lapsed |