US3963844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion-molded article having good thermal stability
Assignee: Teijin Ltd
•
Filing: 1974-06-10
•
Granted: 1976-06-15
•
Expires: 1994-06-10
Abstract
Abstract A thermally stable extrusion-molded article characterized by (1) consisting of a substantially linear polyester in which at least 90 mol% of the total recurring units consist of tetramethylene 2,6-naphthalate units, (2) having a density not in excess of 1.318, and (3) being in the unstretched state.
Inventors
- 👤 Sakae Shimotsuma
- 👤 Masahiro Hosoi
- 👤 Takatoshi Kuratsuji
- 👤 Shoji Kawase
- 👤 Takeo Shima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 02:55
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/08; B; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/10; B29C48/25; B29C48/78; B29C48/793; B29C48/86; B29C48/865; B29C48/88; B29C48/911; B29C48/9135; B29C48/914; B29C48/915; B29C48/917; B29C48/919; B29C48/885; C08J2367/00; C08J2367/02; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/139; Y10T428/26; Y10T428/261; Y10T428/268; Y10T428/269; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
40 words
A thermally stable unstretched extrusion-molded article comprising an extrusion-molded, unstretched substantially linear polyester in which at least 90 mol% of the total recurring units consist of tetramethylene 2,6-naphthalate units, having a density not in excess of 1.318 g/cm 3 .
Claim 2
Dependent Claim
40 words
A thermally stable unstretched extrusion-molded article comprising an extrusion-molded, unstretched substantially linear polyester in which at least 90 mol% of the total recurring units consist of tetramethylene 2,6-naphthalate units, having a density not in excess of 1.318 g/cm 3 .
Claim 3
Dependent Claim
47 words
The extrusion-molded article of claim 1 wherein said polyester has a reduced viscosity of at least 0.70, the reduced viscosity being calculated on the basis of the viscosity value measured on a solution of the polymer in o-chlorophenol in a concentration of 1.20 grams/100 ml. at 35°C.
Claim 4
Dependent Claim
47 words
The extrusion-molded article of claim 1 wherein said polyester has a reduced viscosity of at least 0.95, the reduced viscosity being calculated on the basis of the viscosity value measured on a solution of the polymer in o-chlorophenol in a concentration of 1.20 grams/100 ml. at 35°C.
Claim 5
Dependent Claim
15 words
The extrusion-molded article of claim 1 which has a thickness of 4 to 1000 microns.
Claim 6
Dependent Claim
41 words
The extrusion-molded article of claim 1 which has a transmittance of light of wavelength 650 nanometer of at least 20%, the transmittance being determined with respect to a sample having a thickness of 150 microns and being free from any additive.
Claim 7
Dependent Claim
14 words
The extrusion-molded article of claim 1 which is in the form of a film.
Claim 8
Dependent Claim
14 words
The extrusion-molded article of claim 1 which is in the form of a tube.
Claim 9
Dependent Claim
20 words
The extrusion-molded article of claim 1 which is in the form of film or tube as an electrically insulating material.
Claim 10
Dependent Claim
24 words
The extrusion-molded article of claim 1 wherein at least 95 mol% of the total recurring units of said polyester consist of tetramethylene 2,6-naphthalate units.
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) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |