Patent US3961008A successfully refreshed from Google Patents.
US3961008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyester shaped articles
Assignee: Teijin Ltd
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Filing: 1974-08-26
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Granted: 1976-06-01
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Expires: 1994-08-26
Abstract
Abstract A process for preparing a shaped article by melt-extruding a polyester containing tetramethylene naphthalene-2,6-dicarboxylate or hexamethylene naphthalene-2,6-dicarboxylate as a main recurring unit, wherein the extrudate is exposed to a temperature of 75° to 450°C. for 1 to 180 seconds immediately after extrusion.
Inventors
- 👤 Takatoshi Kuratsuji
- 👤 Shoji Kawase
- 👤 Takeo Shima
- 👤 Sakae Shimotsuma
- 👤 Masahiro Hosoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:42
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; B29C48/86; B29C48/865; B29C48/88; B29C48/885; B29C48/91; B29C48/911; B29C48/9135; B29C48/914; B29C48/919; C08J2367/00; C08J2367/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
92 words
A process for preparing a transparent shaped article by melt-extruding a polyester containing tetramethylene naphthalene-2,6-dicarboxylate or hexamethylene naphthalene-2,6-dicarboxylate as a main recurring unit, comprising exposing the extrudate to a temperature ranging from 75°C. to a temperature lower than the melting point of the polyester for 5 to 180 seconds immediately after extrusion to thereby solidify the extrudate without any substantial crystallization and thereafter quenching said solidified extrudate to produce a transparent shaped polyester article wherein said exposure and quenching steps are carried out prior to any stretching of said shaped transparent article.
Claim 2
Dependent Claim
92 words
A process for preparing a transparent shaped article by melt-extruding a polyester containing tetramethylene naphthalene-2,6-dicarboxylate or hexamethylene naphthalene-2,6-dicarboxylate as a main recurring unit, comprising exposing the extrudate to a temperature ranging from 75°C. to a temperature lower than the melting point of the polyester for 5 to 180 seconds immediately after extrusion to thereby solidify the extrudate without any substantial crystallization and thereafter quenching said solidified extrudate to produce a transparent shaped polyester article wherein said exposure and quenching steps are carried out prior to any stretching of said shaped transparent article.
Claim 3
Dependent Claim
100 words
A process for preparing a transparent sheet or film by melt-extruding a polyester containing tetramethylene naphthalene-2,6-dicarboxylate or hexamethylene naphthalene-2,6-dicarboxylate, comprising intimately contacting the extrudate with the surface of a casting drum kept at a temperature ranging from 75°C. to a point lower than the melting point of the polyester for 5 to 180 seconds immediately after extrusion to thereby solidify the extrudate without any substantial crystallization and thereafter quenching said solidified extrudate to produce a transparent polyester sheet or film wherein said intimate contacting and quenching steps are carried out prior to any stretching of said transparent sheet or film.
Claim 4
Dependent Claim
100 words
A process for preparing a transparent sheet or film by melt-extruding a polyester containing tetramethylene naphthalene-2,6-dicarboxylate or hexamethylene naphthalene-2,6-dicarboxylate, comprising intimately contacting the extrudate with the surface of a casting drum kept at a temperature ranging from 75°C. to a point lower than the melting point of the polyester for 5 to 180 seconds immediately after extrusion to thereby solidify the extrudate without any substantial crystallization and thereafter quenching said solidified extrudate to produce a transparent polyester sheet or film wherein said intimate contacting and quenching steps are carried out prior to any stretching of said transparent sheet or film.
Claim 5
Dependent Claim
82 words
A process for preparing a transparent tube by melt-extruding a polyester containing tetramethylene naphthalene-2,6-dicarboxylate, comprising passing the extrudate through and in contact with a gaseous atmosphere kept at a temperature of 150° to 450°C. for 1 to 30 seconds immediately after extrusion to thereby solidify said extrudate without any substantial crystallization and thereafter quenching said solidified extrudate to produce a transparent polyester tube wherein said extrudate is passed through the gaseous atmosphere and quenched prior to any stretching of said transparent tube.
Claim 6
Dependent Claim
82 words
A process for preparing a transparent tube by melt-extruding a polyester containing tetramethylene naphthalene-2,6-dicarboxylate, comprising passing the extrudate through and in contact with a gaseous atmosphere kept at a temperature of 150° to 450°C. for 1 to 30 seconds immediately after extrusion to thereby solidify said extrudate without any substantial crystallization and thereafter quenching said solidified extrudate to produce a transparent polyester tube wherein said extrudate is passed through the gaseous atmosphere and quenched prior to any stretching of said transparent tube.
Claim 7
Dependent Claim
109 words
A process for preparing a transparent sheet, film or tube by melt-extruding a polyester containing tetramethylene naphthalene-2,6-dicarboxylate or hexamethylene naphthalene-2,6-dicarboxylate as a main recurring unit, comprising passing the extrudate through and in contact with a liquid medium kept at a temperature ranging from 75°C. to a point lower than the melting point of the polyester for 5 to 180 seconds immediately after extrusion to thereby solidify said extrudate without any substantial crystallization and thereafter quenching said solidified extrudate to produce a transparent polyester sheet, film or tube wherein said extrudate is passed through the liquid medium and quenched prior to any stretching of said transparent sheet, film or tube.
Claim 8
Dependent Claim
109 words
A process for preparing a transparent sheet, film or tube by melt-extruding a polyester containing tetramethylene naphthalene-2,6-dicarboxylate or hexamethylene naphthalene-2,6-dicarboxylate as a main recurring unit, comprising passing the extrudate through and in contact with a liquid medium kept at a temperature ranging from 75°C. to a point lower than the melting point of the polyester for 5 to 180 seconds immediately after extrusion to thereby solidify said extrudate without any substantial crystallization and thereafter quenching said solidified extrudate to produce a transparent polyester sheet, film or tube wherein said extrudate is passed through the liquid medium and quenched prior to any stretching of said transparent sheet, film or tube.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |