US4335232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optically anisotropic melt forming polyesters
Assignee: EIDP Inc
•
Filing: 1981-07-07
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Granted: 1982-06-15
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Expires: 2001-07-07
Abstract
Abstract Fiber-forming aromatic polyester consisting essentially of 1,4-dioxyphenylene units, lower alkyl or halo-1,4-dioxyphenylene units, terephthaloyl units and 3-carbonyl-4'-oxybenzophenone or 4-carbonyl-4'-oxybenzophenone units or chloro- and/or methyl substituted homologs of these.
Inventors
- 👤 Robert S. Irwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:18
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08G63/605; C08G63/68; C08G63/682
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
105 words
Fiber-forming melt-spinnable copolyesters that exhibit optical anisotropy in the melt consisting essentially of Units I, II, IIIA or IIIB having the structural formulas: ##STR2## where X is selected from the group consisting of hydrogen, halo or lower alkyl, Y is selected from the group consisting of hydrogen, chloro- and methyl, and wherein said polyesters comprise from about 25 to 45 mole % of Unit I, from about 25 to 45 mole % of Unit II and from about 10 to 50 mole % of Unit IIIA or IIIB, the number of dioxy units in the polyester being substantially equal to the number of dicarbonyl units.
Claim 2
Dependent Claim
105 words
Fiber-forming melt-spinnable copolyesters that exhibit optical anisotropy in the melt consisting essentially of Units I, II, IIIA or IIIB having the structural formulas: ##STR2## where X is selected from the group consisting of hydrogen, halo or lower alkyl, Y is selected from the group consisting of hydrogen, chloro- and methyl, and wherein said polyesters comprise from about 25 to 45 mole % of Unit I, from about 25 to 45 mole % of Unit II and from about 10 to 50 mole % of Unit IIIA or IIIB, the number of dioxy units in the polyester being substantially equal to the number of dicarbonyl units.
Claim 3
Dependent Claim
138 words
Fiber-forming copolyester according to claim 1 consisting of Units I, II and IIIA or IIIB with the proviso that when Unit IIIB is present, X is halo- or 1-4 carbon lower alkyl and Units I and II are each present in the proportion of from 37.5-45 mole % with Unit IIIB constituting the remaining units; when Unit IIIA is present and X is hydrogen, Units I and II are each present in the proportion of from 27.5-32.5 mole % with Unit IIIA constituting the remaining units; and when Unit IIIA is present and X is halo- or 1-4 carbon lower alkyl, Units I and II are each present in the proportion of from 25-45 mole % with Unit IIIA constituting the remaining units; in each case, moles of Unit I being substantially equal to moles of Unit II.
Claim 4
Dependent Claim
8 words
A filament of a copolyester of claim 1.
Claim 5
Dependent Claim
34 words
Fiber-forming copolyester according to claim 2 wherein Units I and II are each present in the proportions of from 37.5-45 mole %; X is chloro or methyl and Unit IIIB constitutes the remaining units.
Claim 6
Dependent Claim
8 words
A filament of a copolyester of claim 4.
Claim 7
Dependent Claim
32 words
Fiber-forming copolyester according to claim 2 wherein Units I and II are each present in the proportions of from 27.5-32.5 mole %; X is hydrogen and Unit IIIA constitutes the remaining units.
Claim 8
Dependent Claim
8 words
A filament of a copolyester of claim 6.
Claim 9
Dependent Claim
34 words
Fiber-forming copolyesters according to claim 2 wherein Units I and II are each present in the proportions of from 25-45 mole %; X is chloro or methyl and Unit IIIA constitutes the remaining units.
Claim 10
Dependent Claim
8 words
A filament of a copolyester of claim 8.
References Cited (Backward Citations)
US4067852A
Cited
US4083829A
Cited
US4130545A
Cited
US4161470A
Cited
US4232143A
Cited
US4269965A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-14 | 1985-12-14 | 1986-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-14 | 1989-12-14 | 1990-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-14 | 1993-12-14 | 1994-06-15 | $7700.00 | Window Closed / Lapsed |