US4547329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for forming copolymer particles
Assignee: Eastman Chemical Co
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Filing: 1983-10-31
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Granted: 1985-10-15
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Expires: 2003-10-31
Abstract
Abstract Disclosed is a process for the formation of olefin-vinyl alcohol copolymer pellets which comprises mixing particles of the copolymer with water to obtain a wet cake containing about 20-70% solids by weight to thereby obtain a plasticized mass of the copolymer, thereafter extruding the copolymer at a temperature of about 5°-7° C. below the melting point of the mass through a nozzle to form a rod, and dividing the rod into individual pellets.
Inventors
- 👤 John R. Dombroski
- 👤 J. Maynard Hawkins
- 👤 Mark A. Pollock
- 👤 Alan P. Leonard
- 👤 Thomas A. Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:30
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; B; B29; B29B; B29B9/00; B29B9/12; B29B9/02; B29B9/06; B29K; B29K2029/00; C08J2329/00; C08J2329/02; C08J2329/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
Process for the formation of olefin-vinyl alcohol copolymer pellets, said polymer having less than 3% vinyl acetate, which comprises mixing particles of said copolymer with water to obtain a wet cake containing about 20-70% solids by weight to thereby obtain a plasticized mass of the copolymer, thereafter extruding the mixture of the copolymer and water at a temperature of about 5-7° C. below the melting point of the mass through a nozzle to form a rod, and dividing the rod into individual pellets.
Claim 2
Dependent Claim
83 words
Process for the formation of olefin-vinyl alcohol copolymer pellets, said polymer having less than 3% vinyl acetate, which comprises mixing particles of said copolymer with water to obtain a wet cake containing about 20-70% solids by weight to thereby obtain a plasticized mass of the copolymer, thereafter extruding the mixture of the copolymer and water at a temperature of about 5-7° C. below the melting point of the mass through a nozzle to form a rod, and dividing the rod into individual pellets.
Claim 3
Dependent Claim
34 words
Process according to claim 1 wherein the olefin content of the copolymer is between about 5.0% and about 40% by weight and the residual ester content of the vinyl alcohol portion is below 3%.
Claim 4
Dependent Claim
10 words
Process according to claim 1 wherein the olefin is ethylene.
Claim 5
Dependent Claim
10 words
Process according to claim 2 wherein the olefin is ethylene.
Claim 6
Dependent Claim
15 words
Process according to claim 1 wherein said wet cake contains about 20-40% solids by weight.
Claim 7
Dependent Claim
22 words
Process according to claim 1 wherein said mixture of the copolymer and water is extruded at a temperature of about 63°-73° C.
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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) | 1988-10-14 | 1989-04-15 | 1989-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-14 | 1993-04-15 | 1993-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-14 | 1997-04-15 | 1997-10-15 | $7700.00 | Window Closed / Lapsed |