US4902369A
Expired / Lapsed
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Method for the processing of liquid crystal polymers
Assignee: DELAWARE NEWARK DELAWARE 19716 A NOT-FOR-PROFIT CORP INCORP OF, University of
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Filing: 1988-06-23
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Granted: 1990-02-20
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Expires: 2008-06-23
Abstract
Abstract Described and claimed are a process for preserving the orientation of a liquid crystal polymer/during lamination which comprises carrying out the lamination bonding at a high temperature below the melting point of the polymer and under pressure of up to about 5 MPa.
Inventors
- 👤 Nadka V. Avramova
- 👤 Stoyko C. Fakirov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:06
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B32B27/36; B32B7/00; B32B7/04; B32B7/12; B29K; B29K2105/00; B29K2105/0079; B32B2309/00; B32B2309/04; B32B2309/12; C; C09; C09K; C09K2323/00; C09K2323/05; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
77 words
The process of laminating liquid crystal polymer films having a high degree of molecular orientation as formed while maintaining the molecular orientation which comprises: cooling the films as formed to a temperature of around 0° C., and thereby freezing the molecular orientation, and contacting a multiplicity of said films at a temperature of at least 100° C. but below the melting point of the polymer and at a pressure of about 0.05-5 MPa for about 3-10 hours.
Claim 2
Dependent Claim
77 words
The process of laminating liquid crystal polymer films having a high degree of molecular orientation as formed while maintaining the molecular orientation which comprises: cooling the films as formed to a temperature of around 0° C., and thereby freezing the molecular orientation, and contacting a multiplicity of said films at a temperature of at least 100° C. but below the melting point of the polymer and at a pressure of about 0.05-5 MPa for about 3-10 hours.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the films are cooled in ice water.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein the liquid crystal polymer is a copolymer of poly(ethylenepterephthalate) and a hydroxybenzoic acid.
Claim 5
Dependent Claim
15 words
The process of claim 3 wherein the liquid crystal polymer is 60 mole-% p-hydroxybenzoic acid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-19 | 1993-08-21 | 1994-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-19 | 1997-08-21 | 1998-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-19 | 2001-08-21 | 2002-02-20 | $7700.00 | Window Closed / Lapsed |