US3275590A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersing carbon black in terephthalate polyesters by sand grinding
Assignee: EIDP Inc
•
Filing: 1962-02-21
•
Granted: 1966-09-27
•
Expires: 1982-02-21
Abstract
No abstract record available.
Inventors
- 👤 Lee W Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:46
CPC Classifications
C; C08; C08G; C08G85/00; C08G63/00; C08G63/78; C08G63/785; C08K; C08K3/00; C08K3/02; C08K3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
IN THE PROCESS OF POLYMERIZING MONOMER TO FORM A FIBER-FORMING SYNTHETIC LINEAR CONDENSATION POLYESTER AND EXTRUDING THE POLYESTER INTO A SHAPED STRUCTURE THE IMPROVEMENT FOR INCORPORATING FINELY-DIVIDED, CARBON BLACK PIGMENT, OF INTERRUPTING SAID POLYMERIZING AT A PREPOLYMER FORM OF SAID POLYESTER HAVING AN INTRINSIC VISCOSITY OF 0.05 TO 0.3 MEASURED IN FOMAL SOLVENT AT 25*C., SAND GRINDING A MELT OF SAID PREPOLYMER AND UP TO 10 PARTS BY WEIGHT OF THE CARBON BLACK PER 100 PARTS BY WEIGHT OF PREPOLYMER AT A TEMPERATURE OF AT LEAST 160* C. WITH 20-40 MESH SAND IN A BULK VOLUME RATIO OF SAND TO PREPOLYMER WITHIN THE RANGE OF 0.8:1 TO 1.2:1, CONTINUING SAND GRINDING WITH HIHG-SPEED AGITATION TO PRODUCE A CARBON BLACK DISPERSION OF LESS THAN 1 MICRON SIZE IN THE MOLTEN PREPOLYMER, SEPARATING THE SAND FROM THE PREPOLYMER, AND PREPARING A PIGMENTED POLYESTER HAVING AN INTRINSIC VISCOSITY GREATER THAN 0.23 FROM THE PREPOLYMER.
Claim 2
Dependent Claim
151 words
IN THE PROCESS OF POLYMERIZING MONOMER TO FORM A FIBER-FORMING SYNTHETIC LINEAR CONDENSATION POLYESTER AND EXTRUDING THE POLYESTER INTO A SHAPED STRUCTURE THE IMPROVEMENT FOR INCORPORATING FINELY-DIVIDED, CARBON BLACK PIGMENT, OF INTERRUPTING SAID POLYMERIZING AT A PREPOLYMER FORM OF SAID POLYESTER HAVING AN INTRINSIC VISCOSITY OF 0.05 TO 0.3 MEASURED IN FOMAL SOLVENT AT 25*C., SAND GRINDING A MELT OF SAID PREPOLYMER AND UP TO 10 PARTS BY WEIGHT OF THE CARBON BLACK PER 100 PARTS BY WEIGHT OF PREPOLYMER AT A TEMPERATURE OF AT LEAST 160* C. WITH 20-40 MESH SAND IN A BULK VOLUME RATIO OF SAND TO PREPOLYMER WITHIN THE RANGE OF 0.8:1 TO 1.2:1, CONTINUING SAND GRINDING WITH HIHG-SPEED AGITATION TO PRODUCE A CARBON BLACK DISPERSION OF LESS THAN 1 MICRON SIZE IN THE MOLTEN PREPOLYMER, SEPARATING THE SAND FROM THE PREPOLYMER, AND PREPARING A PIGMENTED POLYESTER HAVING AN INTRINSIC VISCOSITY GREATER THAN 0.23 FROM THE PREPOLYMER.
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) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |