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Patent US4638034A successfully refreshed from Google Patents.
US4638034A
Expired / Lapsed
US
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Preparation of ethylene-acrylic acid copolymer or salt thereof
Assignee: Equistar Chemicals LP
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Filing: 1985-06-24
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Granted: 1987-01-20
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Expires: 2005-06-24
Abstract
Abstract Ethylene-acrylic acid copolymers or salts thereof are prepared by first preparing an ethylene-alkyl acrylate copolymer, saponifying such ethylene-alkyl acrylate copolymer in the molten state, in the absence of solvent or water other than by-product alkanol, with selected metal hydroxides to form alkanol and a salt, or an ionomer, of ethylene-acrylic acid copolymer, and optionally acidifying such salt to form ethylene-acrylic acid copolymer.
Inventors
- 👤 Dorothee M. McClain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:05
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/44; C08F2800/00; C08F2800/20; C08F2810/00; C08F2810/50
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
71 words
A process for preparing an ethylene-acrylic acid copolymer salt which comprises saponifying an ethylene-alkyl acrylate copolymer in the molten state, in the absence of solvent or water other than by-product alkanol, with alkali metal hydroxide or alkaline earth metal hydroxide under non-static mixing conditions so as to thereby form alkanol and an alkali metal or alkaline earth metal salt of ethylene-acrylic acid copolymer, and separately recovering said alkanol and said salt.
Claim 2
Dependent Claim
71 words
A process for preparing an ethylene-acrylic acid copolymer salt which comprises saponifying an ethylene-alkyl acrylate copolymer in the molten state, in the absence of solvent or water other than by-product alkanol, with alkali metal hydroxide or alkaline earth metal hydroxide under non-static mixing conditions so as to thereby form alkanol and an alkali metal or alkaline earth metal salt of ethylene-acrylic acid copolymer, and separately recovering said alkanol and said salt.
Claim 3
Dependent Claim
21 words
A process as in claim 1 in which said saponifying is conducted at a temperature of 30°-300° C. at atmospheric pressure.
Claim 4
Dependent Claim
16 words
A process as in claim 1 in which said salt is, subsequently, at least partially acidifed.
Claim 5
Dependent Claim
20 words
A process as in claim 3 in which the acidification is carried out in a solvent comprising dipolar aprotic solvent.
Claim 6
Dependent Claim
79 words
A process for preparing an ethylene acrylic acid copolymer salt which comprises first forming an ethylene-alkyl acrylate copolymer and then saponifying said copolymer in the molten state, in the absence of solvent or water other than by-product alkanol, with alkali metal hydroxide or alkaline earth metal hydroxide under non-static mixing conditions so as to thereby form alkanol and an alkali metal or alkaline earth metal salt of ethylene acrylic acid copolymer, and separately recovering said alkanol and said salt.
Claim 7
Dependent Claim
79 words
A process for preparing an ethylene acrylic acid copolymer salt which comprises first forming an ethylene-alkyl acrylate copolymer and then saponifying said copolymer in the molten state, in the absence of solvent or water other than by-product alkanol, with alkali metal hydroxide or alkaline earth metal hydroxide under non-static mixing conditions so as to thereby form alkanol and an alkali metal or alkaline earth metal salt of ethylene acrylic acid copolymer, and separately recovering said alkanol and said salt.
Claim 8
Dependent Claim
21 words
A process as in claim 5 in which said saponifying is conducted at a temperature of 30°-300° C. at atmospheric pressure.
Claim 9
Dependent Claim
16 words
A process as in claim 5 in which said salt is, subsequently, at least partially acidified.
Claim 10
Dependent Claim
21 words
A process as in claim 5 in which said ethylene-alkyl acrylate copolymer is formed in a reactor made of carbon steel.
Claim 11
Dependent Claim
20 words
A process as in claim 7 in which the acidification is carried out in a solvent comprising dipolar aprotic solvent.
Claim 12
Dependent Claim
37 words
A process as in claim 1 in which said hydroxide is used in an amount which is up to 25% more than the stoichiometric amount thereof needed to effect the desired level of saponification of said copolymer.
Claim 13
Dependent Claim
28 words
A process as in claim 1 in which said amount is 50 to 100% of the calculated amount of hydroxide needed to effect complete saponification of said copolymer.
Claim 14
Dependent Claim
25 words
A process as in claim 1 in which said saponification process is conducted so as to achieve a level of saponification of up to 79%.
Claim 15
Dependent Claim
26 words
A process as in claim 12 in which said saponification process is conducted so as to achieve a level of saponification of up to about 45%.
References Cited (Backward Citations)
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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) | 1990-01-19 | 1990-07-21 | 1991-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-19 | 1994-07-21 | 1995-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-19 | 1998-07-21 | 1999-01-20 | $7700.00 | Window Closed / Lapsed |