Patent US5360672A successfully refreshed from Google Patents.
US5360672A
Expired / Lapsed
US
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Process for treating film comprising liquid crystal polymer
Assignee: Kuraray Co Ltd
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Filing: 1992-04-08
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Granted: 1994-11-01
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Expires: 2012-04-08
Abstract
Abstract A process for treating a film comprising a liquid crystal polymer capable of forming an optically anisotropic melt phase, which comprises passing the film between press rolls at a temperature in a range of from 80 DEG C. below the melting point of the liquid crystal polymer to 5 DEG C. below the same melting point and under a linear pressure of 20 to 400 kg/cm.
Inventors
- 👤 Koichi Saito
- 👤 Takeichi Tsudaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:55
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/18; B29K; B29K2105/00; B29K2105/0079; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K3/00; H05K3/0011; Y; Y10; Y10S; Y10S428/00; Y10S428/906; Y10S428/91; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31786
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
87 words
A process for improving abrasion resistance of a film comprising a liquid crystal polymer capable of forming an optically anisotropic melt phase, which comprises passing said film having a thickness of 500 μm or less between press rolls at a temperature in a range of from 80° C. below the melting point of the liquid crystal polymer to 5° C. below the same melting point and under a linear pressure of 20 to 400 kg/cm wherein the pressed film maintains at least 98% of its original thickness.
Claim 2
Dependent Claim
87 words
A process for improving abrasion resistance of a film comprising a liquid crystal polymer capable of forming an optically anisotropic melt phase, which comprises passing said film having a thickness of 500 μm or less between press rolls at a temperature in a range of from 80° C. below the melting point of the liquid crystal polymer to 5° C. below the same melting point and under a linear pressure of 20 to 400 kg/cm wherein the pressed film maintains at least 98% of its original thickness.
Claim 3
Dependent Claim
34 words
A process according to claim 1, wherein said temperature is in a range of from 50° C. below the melting point of the liquid crystal polymer to 10° C. below the same melting point.
Claim 4
Dependent Claim
15 words
A process according to claim 1, wherein said linear pressure is 50 to 300 kg/cm.
Claim 5
Dependent Claim
28 words
A process according to claim 1, wherein said press rolls rotate for the pressing at a linear speed of the circumference of roll of 0.5 to 30 m/min.
Claim 6
Dependent Claim
24 words
A process according to claim 1, wherein the film after the pressing maintains a thickness of at least 99% of that before the pressing.
Claim 7
Dependent Claim
51 words
A process according to claim 1, wherein said liquid crystal polymer is a thermotropic liquid crystal polyester consisting essentially of the following structural units (I) and (II) ##STR14## with the molar ratio between the structural unit (I) and the structural unit (II), being in a range of from 90/10 to 10/90.
Claim 8
Dependent Claim
88 words
A film having improved abrasion resistance obtained by pressing a film comprising a liquid crystal polymer capable of forming an optically anisotropic melt phase by passing said film having a thickness of 500 μm or less between press rolls at a temperature in a range of from 80° C. below the melting point of the liquid crystal polymer to 5° C. below the same melting point and under a linear pressure of 20 to 400 kg/cm wherein the pressed film maintains at least 98% of its original thickness.
Claim 9
Dependent Claim
88 words
A film having improved abrasion resistance obtained by pressing a film comprising a liquid crystal polymer capable of forming an optically anisotropic melt phase by passing said film having a thickness of 500 μm or less between press rolls at a temperature in a range of from 80° C. below the melting point of the liquid crystal polymer to 5° C. below the same melting point and under a linear pressure of 20 to 400 kg/cm wherein the pressed film maintains at least 98% of its original thickness.
Claim 10
Dependent Claim
34 words
A film according to claim 7, wherein said temperature is in a range of from 50° C. below the melting point of the liquid crystal polymer to 10° C. below the same melting point.
Claim 11
Dependent Claim
15 words
A film according to claim 7, wherein said linear pressure is 50 to 300 kg/cm.
Claim 12
Dependent Claim
28 words
A film according to claim 7, wherein said press rolls rotate for the pressing at a linear sped of the circumference of roll of 0.5 to 30 m/min.
Claim 13
Dependent Claim
20 words
A film according to claim 7, said film maintaining a thickness of at least 99% of that before the pressing.
Claim 14
Dependent Claim
52 words
A film according to claim 7, wherein said liquid crystal polymer is a thermotropic liquid crystal polyester consisting essentially of the following structural units (I) and (II) ##STR15## with the molar ratio between the structural unit (I) and the structural unit (II), [(I)/(II)], being in a range of from 90/10 to 10/90.
Claim 15
Dependent Claim
11 words
A laminate comprising a layer of the film of claim 7.
Claim 16
Dependent Claim
11 words
A laminate comprising a layer of the film of claim 12.
Claim 17
Dependent Claim
14 words
A flexible printed wiring board comprising a substrate comprising the film of claim 7.
Claim 18
Dependent Claim
14 words
A flexible printed wiring board comprising a substrate comprising the film of claim 12.
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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) | 1997-10-31 | 1998-05-02 | 1998-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-31 | 2002-05-02 | 2002-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-31 | 2006-05-02 | 2006-11-01 | $7700.00 | Window Closed / Lapsed |