US4058904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for drying wet particles of hydrolyzed ethylene-vinyl acetate copolymer
Assignee: Mitsubishi Chemical Corp
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Filing: 1976-03-24
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Granted: 1977-11-22
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Expires: 1996-03-24
Abstract
Abstract Process for drying wet particles of hydrolyzed ethylene-vinyl acetate copolymer under the specific condition as follows: A. a pressure in a dryer of not more than 120 mmHg, B. a temperature of the heating surface of dryer of not more than 100° C., and C. T × θ 0 .6 ≦ 320, wherein T is a temperature (° C.) of the heating surface of dryer and θ is a residence time (hour) of the particles in the dryer. The thus obtained particles have excellent molding properties.
Inventors
- 👤 Hiroshi Takida
- 👤 Akio Kido
- 👤 Masazumi Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:47
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
In a process for drying wet particles of hydrolyzed ethylene-vinyl acetate copolymer having an ethylene content of 20 to 50% by mole, a vinyl acetate content of 80 to 50% by mole and a degree of hydrolysis in vinyl acetate component of at least 90% by mole obtained by hydrolyzing ethylene-vinyl acetate copolymer in a medium, the improvement which comprises carrying out the drying under a pressure in a dryer of up to 120 mmHg, a temperature of the heating surface of the dryer of up to 100° C., and such that T × θ 0 .6 ≦ 320 wherein T is a temperature (°C.) of the heating surface and θ is a residence time of the particles in the dryer.
Claim 2
Dependent Claim
121 words
In a process for drying wet particles of hydrolyzed ethylene-vinyl acetate copolymer having an ethylene content of 20 to 50% by mole, a vinyl acetate content of 80 to 50% by mole and a degree of hydrolysis in vinyl acetate component of at least 90% by mole obtained by hydrolyzing ethylene-vinyl acetate copolymer in a medium, the improvement which comprises carrying out the drying under a pressure in a dryer of up to 120 mmHg, a temperature of the heating surface of the dryer of up to 100° C., and such that T × θ 0 .6 ≦ 320 wherein T is a temperature (°C.) of the heating surface and θ is a residence time of the particles in the dryer.
References Cited (Backward Citations)
US3802090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |