Patent US4387209A successfully refreshed from Google Patents.
US4387209A
Expired / Lapsed
US
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Novel polyester
Assignee: Isovolta AG
•
Filing: 1982-05-05
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Granted: 1983-06-07
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Expires: 2002-05-05
Abstract
Abstract An organic, high-molecular weight polyester containing substantially chain members of the formula --O--X--O--Y-- wherein X is at least one member of the group consisting of ##STR1## and Y has the formula ##STR2## having an inherent viscosity of at least 1.0 dl/g, preferably at least 1.2, dl/g measured at 30° C. in a solution of 0.5 g of the polyester in 100 ml of a mixture of 60% by weight of phenol and 40% by weight of 1,1,2,2-tetrachloroethane and whose films cast from a chlorinated organic solution have an elongation at break of at least 10%, preferably at least 20%, measured according to ASTM D-882-75 b with the proviso that if the inherent viscosity is between 1.0 dl/g and 1.5 dl/g, Y is a mixture of 70 to 30% of terephthalic acid and 30 to 70% of isophthalic acid having excellent properties for electrical insulation as well as other fields.
Inventors
- 👤 Werner Rieder
- 👤 Martin Fehrle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:05
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/19; C08G63/193; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; H01B3/421; H01B3/422; H01B3/423; C08J2367/00; C08J2367/02
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
127 words
An organic, high-molecular weight polyester containing substantially chain members of the formula --O--X--O--Y-- wherein X is at least one member of the group consisting of ##STR7## and Y has the formula ##STR8## having an inherent viscosity of at least 1.0 dl/g measured at 30° C. in a solution of 0.5 g of the polyester in 100 ml of a mixture of 60% by weight of phenol and 40% by weight of 1,1,2,2-tetrachloroethane and whose films cast from a chlorinated organic solution have an elongation at break of at least 10% measured according to ASTM D-882-75 b with the proviso that if the inherent viscosity is between 1.0 and 1.5 dl/g, Y is a mixture of 70 to 30% of terephthalic acid and 30 to 70% of isophthalic.
Claim 2
Dependent Claim
127 words
An organic, high-molecular weight polyester containing substantially chain members of the formula --O--X--O--Y-- wherein X is at least one member of the group consisting of ##STR7## and Y has the formula ##STR8## having an inherent viscosity of at least 1.0 dl/g measured at 30° C. in a solution of 0.5 g of the polyester in 100 ml of a mixture of 60% by weight of phenol and 40% by weight of 1,1,2,2-tetrachloroethane and whose films cast from a chlorinated organic solution have an elongation at break of at least 10% measured according to ASTM D-882-75 b with the proviso that if the inherent viscosity is between 1.0 and 1.5 dl/g, Y is a mixture of 70 to 30% of terephthalic acid and 30 to 70% of isophthalic.
Claim 3
Dependent Claim
14 words
A polyester of claim 1 wherein the inherent viscosity is at least 1.2 dl/g.
Claim 4
Dependent Claim
16 words
A polyester of claim 1 or 2 wherein the elongation at break is at least 20%.
Claim 5
Dependent Claim
28 words
A polyester of claim 1, or 2 wherein X is a mixture of 70 to 30% by weight of ##STR9## and 30 to 70% by weight of ##STR10##
Claim 6
Dependent Claim
13 words
A polyester of claim 4 wherein the mixture is a 50% to 50%.
Claim 7
Dependent Claim
14 words
A polyester of claim 1 wherein the inherent viscosity is greater than 1.5 dl/g.
Claim 8
Dependent Claim
14 words
A polyester of claim 1 wherein the inherent viscosity is greater than 1.8 dl/g.
Claim 9
Dependent Claim
33 words
A polyester of claim 1 wherein the melting point of the monomer of 9,9-bis-(4-hydroxyphenyl)-fluorene used to prepare the polyester had a melting range with a lower limit temperature of at least 227° C.
Claim 10
Dependent Claim
14 words
A polyester of claim 1 containing up to 10% of a second condensable diphenolate.
Claim 11
Dependent Claim
14 words
A polyester of claim 1 containing up to 10% of an additional cross-linking agent.
Claim 12
Dependent Claim
17 words
A film made of a polyester of claim 1 with a thickness of 0.010 to 0.25 mm.
Claim 13
Dependent Claim
14 words
A film of claim 11 wherein the inherent viscosity is at least 1.2 dl/g.
Claim 14
Dependent Claim
16 words
A film of claim 11 or 12 wherein the elongation at break is at least 20%.
Claim 15
Dependent Claim
30 words
A film of claim 11 or 12 or 13 wherein X is a mixture of 70 to 30% by weight or ##STR11## and 30 to 70% by weight of ##STR12##
Claim 16
Dependent Claim
13 words
A film of claim 14 wherein the mixture is a 50% to 50%.
Claim 17
Dependent Claim
14 words
A film of claim 11 wherein the inherent viscosity is greater than 1.5 dl/g.
Claim 18
Dependent Claim
14 words
A film of claim 11 wherein the inherent viscosity is greater than 1.8 dl/g.
Claim 19
Dependent Claim
16 words
A film of claim 11 provided with an adhesive layer on at least one side thereof.
Claim 20
Dependent Claim
8 words
The polyester of claim 1 in powder form.
Claim 21
Dependent Claim
11 words
A polyester of claim 8 containing residual amounts of metal catalyst.
References Cited (Backward Citations)
US4066623A
Cited
US4201855A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |