Patent US3335211A successfully refreshed from Google Patents.
US3335211A
Expired / Lapsed
US
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Process for melt spinning linear polyester modified with an oxysilicon compound
Assignee: EIDP Inc
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Filing: 1967-03-07
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Granted: 1967-08-08
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Expires: 1987-03-07
Abstract
No abstract record available.
Inventors
- 👤 Edward J Mead
- 👤 Cecil E Reese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:14
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; B; B29; B29D; B29D29/00; B60; B60C; B60C9/00; B60C9/0042; C08G; C08G63/00; C08G63/68; C08G63/78; C08G63/80; C08L; C08L67/00; C08L67/02; D; D01; D01F; D01F1/00; D01F1/02; D01F1/10; D01F6/00; D01F6/58; D01F6/62; C08J2321/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
179 words
AN IMPROVEMENT IN THE PROCESS OF MELT SPINNING A GLYCOL TEREPHTHALATE POLYESTER TO PRODUCE TEXTILE FIBERS OF SUFFICIENTLY LOW MOLECULAR WEIGHT TO SUBSTANTIALLY DECREASE PILLING IN FABRICS CONTAINING THE FIBERS, WHICH PROCESS INCLUDES, MELT-POLYMERIZATION OF AN ESTER OF TEREPTHITHALIC ACID AND A GLYCOL OF 2 TO 18 CARBON ATOMS FREE FROM ALIPHATIC UNSATURATION, IN THE PRESENCE OF A CONDENSATION CATALYST, TO A FINAL TEMPERATURE OF ABOUT 250* TO ABOUT 300*C. AND A FINAL PRESSURE OF LESS THAN 10 MM. OF MERCURY TO FORM AN ANHYDROUS MELT; WHEREIN THE IMPROVEMENT COMPRISES CONDUCTING SAID MELT-POLYMERIZATION IN THE PRESENCE OF A CONDENSATION CATALYST SELECTED FROM THE GROUP CONSISTING OF GLYCOL-SOLUBLE COMPOUNDS OF ANTIMONY OR TITANIUM AND ADDING AN OXYSILICON COMPOUND PRIOR TO MELT SPINNING TO FORM AN ANHYDROUS MELT HAVING A MELT VISCOSITY AT 275*C. OF ABOUT 1000 TO ABOUT 6000 POISES; SAID OXYSILICON COMPOUND BEING ADDED IN THE PROPORTION OF ABOUT 0.1 TO 0.75 GRAM ATOM OF SILICON IN THE ADDED COMPOUND PER 100 GRAM MOLS OF SAID GLYCOL COMPONENT IN THE POLYESTER AND BEING SELECTED FROM THE GROUP CONSISTING OF.
Claim 2
Dependent Claim
179 words
AN IMPROVEMENT IN THE PROCESS OF MELT SPINNING A GLYCOL TEREPHTHALATE POLYESTER TO PRODUCE TEXTILE FIBERS OF SUFFICIENTLY LOW MOLECULAR WEIGHT TO SUBSTANTIALLY DECREASE PILLING IN FABRICS CONTAINING THE FIBERS, WHICH PROCESS INCLUDES, MELT-POLYMERIZATION OF AN ESTER OF TEREPTHITHALIC ACID AND A GLYCOL OF 2 TO 18 CARBON ATOMS FREE FROM ALIPHATIC UNSATURATION, IN THE PRESENCE OF A CONDENSATION CATALYST, TO A FINAL TEMPERATURE OF ABOUT 250* TO ABOUT 300*C. AND A FINAL PRESSURE OF LESS THAN 10 MM. OF MERCURY TO FORM AN ANHYDROUS MELT; WHEREIN THE IMPROVEMENT COMPRISES CONDUCTING SAID MELT-POLYMERIZATION IN THE PRESENCE OF A CONDENSATION CATALYST SELECTED FROM THE GROUP CONSISTING OF GLYCOL-SOLUBLE COMPOUNDS OF ANTIMONY OR TITANIUM AND ADDING AN OXYSILICON COMPOUND PRIOR TO MELT SPINNING TO FORM AN ANHYDROUS MELT HAVING A MELT VISCOSITY AT 275*C. OF ABOUT 1000 TO ABOUT 6000 POISES; SAID OXYSILICON COMPOUND BEING ADDED IN THE PROPORTION OF ABOUT 0.1 TO 0.75 GRAM ATOM OF SILICON IN THE ADDED COMPOUND PER 100 GRAM MOLS OF SAID GLYCOL COMPONENT IN THE POLYESTER AND BEING SELECTED FROM THE GROUP CONSISTING OF.
References Cited (Backward Citations)
GB795782A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-08-07 | 1971-02-06 | 1971-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-07 | 1975-02-06 | 1975-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-07 | 1979-02-06 | 1979-08-08 | $7700.00 | Window Closed / Lapsed |