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Patent US4446195A successfully refreshed from Google Patents.
US4446195A
Expired / Lapsed
US
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Novel polyesters coated on conductive substrate
Assignee: Isovolta AG
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Filing: 1983-03-02
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Granted: 1984-05-01
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Expires: 2003-03-02
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
2026-11-05 01:52
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/19; C08G63/193; C08G63/78; C08G63/79; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; H01B3/421; H01B3/422; H01B3/423; C08J2367/00; C08J2367/02; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/31504; Y10T428/31678; Y10T428/31681; Y10T428/31786
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
137 words
An electrical conductor provided with an electrically insulating layer of 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
137 words
An electrical conductor provided with an electrically insulating layer of 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
17 words
A conductor of claim 1 wherein the inherent viscosity of the polyester is at least 1.2 dl/g.
Claim 4
Dependent Claim
17 words
A conductor of claim 1 wherein the elongation at break of the polyester is at least 20%.
Claim 5
Dependent Claim
27 words
A conductor of claim 1 wherein X is the polyester mixture of 70 to 30% by weight of ##STR9## and 30 to 70% by weight of ##STR10##
Claim 6
Dependent Claim
13 words
A conductor of claim 4 wherein the mixture is a 50% to 50%.
Claim 7
Dependent Claim
17 words
A conductor of claim 1 wherein the inherent viscosity of the polyester is greater than 1.5 dl/g.
Claim 8
Dependent Claim
17 words
A conductor of claim 1 wherein the inherent viscosity of the polyester is greater than 1.8 dl/g.
Claim 9
Independent Claim
149 words
A method of insulating an electrical conductor comprising providing the exterior surface of the electrical conductor with an electrically insulating layer of 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 ##STR11## and Y has the formula ##STR12## 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 10
Independent Claim
149 words
A method of insulating an electrical conductor comprising providing the exterior surface of the electrical conductor with an electrically insulating layer of 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 ##STR11## and Y has the formula ##STR12## 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 11
Dependent Claim
17 words
The method of claim 8 wherein the inherent viscosity of the polyester is at least 1.2 dl/g.
Claim 12
Dependent Claim
28 words
The method of claim 8 or 9 wherein X is a mixture of 70 to 30% by weight of ##STR13## and 30 to 70% by weight of ##STR14##
Claim 13
Dependent Claim
13 words
The method of claim 10 wherein the mixture is a 50% to 50%.
Claim 14
Dependent Claim
17 words
The method of claim 11 wherein the inherent viscosity of the polyester is greater than 1.5 dl/g.
Claim 15
Dependent Claim
17 words
The method of claim 12 wherein the inherent viscosity of the polyester is greater than 1.8 dl/g.
Claim 16
Dependent Claim
17 words
The method of claim 8 wherein the elongation at break of the polyester is at least 20%.
References Cited (Backward Citations)
US4393121A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |