US4340550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oligomer pellets of ethylene terephthalate
Assignee: EIDP Inc
•
Filing: 1980-11-24
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Granted: 1982-07-20
•
Expires: 2000-11-24
Abstract
Abstract Preparation of free-flowing pellets of ethylene terephthalate oligomer by water quenching droplets of molten oligomer.
Inventors
- 👤 Chungfah H. Ho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:19
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; B; B29; B29B; B29B9/00; C08J2367/00; C08J2367/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
106 words
A process for producing free-flowing pellets of ethylene terephthalate oligomer comprising forcing a molten ethylene terephthalate oligomer having an intrinsic viscosity of from about 0.08 to 0.15 through a plurality of orifices of an orifice plate under pressure into an inert gas zone to form jets of the oligomer which dissociate into spherical droplets under the influence of surface tension, allowing the droplets to fall through the inert gas zone into a body of water to solidify the droplets into pellets, said body of water being at a distance of about 20 to 40 inches from said orifice plate, and removing the pellets from the water.
Claim 2
Dependent Claim
106 words
A process for producing free-flowing pellets of ethylene terephthalate oligomer comprising forcing a molten ethylene terephthalate oligomer having an intrinsic viscosity of from about 0.08 to 0.15 through a plurality of orifices of an orifice plate under pressure into an inert gas zone to form jets of the oligomer which dissociate into spherical droplets under the influence of surface tension, allowing the droplets to fall through the inert gas zone into a body of water to solidify the droplets into pellets, said body of water being at a distance of about 20 to 40 inches from said orifice plate, and removing the pellets from the water.
Claim 3
Dependent Claim
47 words
The process of claim 1 wherein the molten polymer is fed to the orifices at a pressure of from about 3 to 48 psig and at a temperature of from about 260° C. to 280° C., said orifices having a diameter of from 0.25 to 2.0 mm.
Claim 4
Dependent Claim
20 words
The process of claim 1 or 2 wherein the body of water is at a temperature below about 80° C.
References Cited (Backward Citations)
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US3657388A
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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) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |