US4710547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing three-dimensionally crosslinked polyester having the liquid crystal structure
Assignee: Polyplastics Co Ltd
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Filing: 1986-05-29
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Granted: 1987-12-01
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Expires: 2006-05-29
Abstract
Abstract A polyester, being capable of the anisotropic property in the molten state and a thermotropic liquid crystals, or a composition comprising a low molecular weight polyester and a thermotropic crosslinked, while having the structure of liquid crystals, by a crosslinking reaction with a compound having at least three reactive groups. The reactive group preferably includes hydroxy, carboxyl, amino, amide, carbodiimide, isocyanate, carbamate, epoxy and ester.
Inventors
- 👤 Toshiyuki Uryu
- 👤 Takashi Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:46
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08G63/12; C08G63/16; C08G63/20; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3804; C09K19/3809
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
71 words
A process for producing a three-dimensionally crosslinked polyester having the liquid crystal structure, said process comprising incorporating a thermotropic liquid crystal polyester (a) which exhibits the anisotropy in the molten state or a polyester composition (b) which is a thermotropic liquid crystal mixture composed of a polyester and a low-molecular weight compound, with a compound (c) having at least three functional groups, whereby crosslinking said polyester (a) or polyester composition (b).
Claim 2
Dependent Claim
71 words
A process for producing a three-dimensionally crosslinked polyester having the liquid crystal structure, said process comprising incorporating a thermotropic liquid crystal polyester (a) which exhibits the anisotropy in the molten state or a polyester composition (b) which is a thermotropic liquid crystal mixture composed of a polyester and a low-molecular weight compound, with a compound (c) having at least three functional groups, whereby crosslinking said polyester (a) or polyester composition (b).
Claim 3
Dependent Claim
49 words
A process for producing a three-dimensionally crosslinked polyester as set forth in claim 1, wherein the compound (c) having at least three functional groups has one or more kinds of functional groups selected from the group consisting of hydroxyl, carboxyl, amino, amide, carbodimide, isocyanate, carbamate, epoxy, and ester groups.
Claim 4
Dependent Claim
30 words
A process for producing a three-dimensionally crosslinked polyester as set forth in claim 1, wherein the compound (c) having at least three functional groups has a functional group of ester.
Claim 5
Dependent Claim
40 words
A process for producing a three-dimensionally crosslinked polyester as set forth in claim 1, wherein the thermotropic liquid crystal mixture composed of a polyester and a low-molecular weight compound contains a low-molecular weight compound which exhibits the liquid crystal properties.
Claim 6
Dependent Claim
28 words
A process for producing a three-dimensionally crosslinked polyester as set forth in claim 4, wherein the low-molecular weight compound is one which exhibits the nematic liquid crystal properties.
Claim 7
Dependent Claim
29 words
A process for producing a three-dimensionally crosslinked polyester as set forth in claim 4, wherein the low-molecular weight compound is one which has a molecular weight lower than 2,000.
Claim 8
Dependent Claim
52 words
A process for producing a three-dimensionally crosslinked polyester as set forth in claim 6, wherein the low-molecular weight compound is one which is represented by the formula below. ##STR16## (where X and Y denote the ester linkage and A and B are each an alkoxy group, alkyl group, alkoxycarbonyl group, or halogen.)
Claim 9
Dependent Claim
35 words
A process for producing a three-dimensionally crosslinked polyester as set forth in claim 4, wherein the polyester is one or more kinds selected from the group consisting of polycarbonate, polyalkylene terephthalate, polyacrylate, and polyester polyamide.
References Cited (Backward Citations)
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US4438236A
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US4325903A
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US4388453A
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US4581399A
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US4619975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-30 | 1991-06-01 | 1991-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-30 | 1995-06-01 | 1995-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-30 | 1999-06-01 | 1999-12-01 | $7700.00 | Window Closed / Lapsed |