US5147682A
Expired / Lapsed
US
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Method for orienting a liquid crystal polymer
Assignee: Ricoh Co Ltd
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Filing: 1990-06-04
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Granted: 1992-09-15
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Expires: 2010-06-04
Abstract
Abstract Disclosed herein is a method of orienting a liquid crystal polymer which comprises coating and drying a solution of a polymeric compound showing a thermotropic liquid crystal property on the surface of a plastic substrate applied with a rubbing treatment, and subjecting to a heat-treatment at a temperature that the liquid crystal polymer exhibits a liquid crystal phase.
Inventors
- 👤 Yasuyuki Takiguchi
- 👤 Shigeki Iida
- 👤 Takehiro Toyooka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:32
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; C; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3804; C09K19/3809; G02B; G02B5/00; G02B5/30; G02B5/3016; G02F1/133365; G02F1/1335; G02F1/13363; C09K2323/00; C09K2323/02; C09K2323/027; G02F1/133633
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
71 words
A method of orienting a liquid crystal polymer, which comprises: a) rubbing a plastic substrate in one direction by directly using a rubbing member, b) coating and drying a solution of a polymeric compound having a thermotropic liquid crystal property on the surface of the plastic substrate, and c) a subjecting the coated plastic substrate to a heat-treatment at a temperature whereby the liquid crystal polymer exhibits a liquid crystal phase.
Claim 2
Independent Claim
71 words
A method of orienting a liquid crystal polymer, which comprises: a) rubbing a plastic substrate in one direction by directly using a rubbing member, b) coating and drying a solution of a polymeric compound having a thermotropic liquid crystal property on the surface of the plastic substrate, and c) a subjecting the coated plastic substrate to a heat-treatment at a temperature whereby the liquid crystal polymer exhibits a liquid crystal phase.
Claim 3
Dependent Claim
22 words
A method according to claim 1, which further comprises cooling to a temperature lower than the glass transition point after the heat-treatment.
Claim 4
Dependent Claim
26 words
A method according to claim 1, wherein the heat-treatment is carried out at a temperature higher than the glass transition point of the liquid crystal polymer.
Claim 5
Dependent Claim
23 words
A method according to claim 3, wherein the heat-treatment is carried out at 50° to 300° C. for 10 sec to 2 hours.
Claim 6
Dependent Claim
24 words
A method according to claim 1, wherein the thermotropic liquid crystal polymeric compound has a glass transition point of not lower than 30° C.
Claim 7
Dependent Claim
30 words
The method according to claim 1, wherein said plastic substrate comprises polyethylene terephthalate, polyallylate, polyethylene naphthalate, polybutylene terephthalate, polyether ether ketone, polyethylene, polycarbonate, polystyrene, polyvinylidene chloride, polyimide, polyamideimide or polyetherimide.
Claim 8
Dependent Claim
19 words
The method of claim 1, wherein said plastic substrate has a thickness of from 5 μm to 1 mm.
Claim 9
Dependent Claim
27 words
The method of claim 1, wherein said rubbing member comprises a cloth; a cloth containing cotton, polyester or nylon fibers; or a sponge of polyurethane or nylon.
Claim 10
Dependent Claim
21 words
The method of claim 1, wherein said webbing is effected with a load of from 1 to 200 g/cm 2 .
Claim 11
Dependent Claim
19 words
The method of claim 1, wherein said polymeric compound comprises polyester, polyester amide, polycarbonate, polyether, vinylic or siloxane polymer.
Claim 12
Dependent Claim
30 words
The method of claim 1, wherein said polymeric compound is coated in a solution containing a solvent which dissolves said polymeric compound, but which does not dissolve the plastic film.
Claim 13
Dependent Claim
24 words
The method of claim 1, wherein the solution of the polymeric compound has a concentration of polymeric compound from 5 to 50% by weight.
Claim 14
Dependent Claim
22 words
The method of claim 4, wherein the heat-treatment is carried out at 50° to 300° C. for 10 sec. to 2 hours.
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) | 1995-09-15 | 1996-03-16 | 1996-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-15 | 2000-03-16 | 2000-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-15 | 2004-03-16 | 2004-09-15 | $7700.00 | Window Closed / Lapsed |