US4248990A
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Nonrandom copolymers of ethylene and unsaturated acid
Assignee: EIDP Inc
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Filing: 1979-04-05
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Granted: 1981-02-03
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Expires: 1999-04-05
Abstract
Abstract Compositionally uniform but nonrandom copolymers of ethylene and α,β-ethylenically unsaturated carboxylic acids having from 3 to 8 carbon atoms are provided having an acid content of from about 6 to about 35 weight percent, a melt index of from about 0.1 to about 800, and a ratio of weight percent adjacent acid to weight percent total acid in the copolymer of from about 0.44 to about 1.0. These copolymers have improved physical properties such as hardness, stiffness, heat resistance and creep resistance. Further provided, is a process for preparing these copolymers in a constant environment stirred autoclave in a continuous manner wherein the reaction zone is maintained in a steady state at a pressure of from 0 to about 500 psi above, and at a temperature of from 0° to about 15° C. above that needed to maintain a single phase reaction mixture at a given concentration of copolymer and at the given acid comonomer content of the copolymer.
Inventors
- 👤 Edwin T. Pieski
- 👤 Thomas F. Sashihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:48
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/02; Y; Y10; Y10S; Y10S526/00; Y10S526/937; Y10S526/94
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
72 words
A compositionally uniform but nonrandom copolymer of ethylene and α,β-ethylenically unsaturated carboxylic acid, said acid having from 3 to 8 carbon atoms and said copolymer containing on a weight basis from about 6 to about 35 percent acid, having a melt index of from about 0.1 to about 800, and having a ratio of weight percent adjacent acid to weight percent acid in the copolymer of from about 0.44 to about 1.0.
Claim 2
Dependent Claim
72 words
A compositionally uniform but nonrandom copolymer of ethylene and α,β-ethylenically unsaturated carboxylic acid, said acid having from 3 to 8 carbon atoms and said copolymer containing on a weight basis from about 6 to about 35 percent acid, having a melt index of from about 0.1 to about 800, and having a ratio of weight percent adjacent acid to weight percent acid in the copolymer of from about 0.44 to about 1.0.
Claim 3
Dependent Claim
30 words
The copolymer of claim 1 containing on a weight basis in excess of 10 to about 25 percent acid and having a melt index of from about 0.2 to 30.
Claim 4
Dependent Claim
26 words
The copolymer of claim 2 having a ratio of percent adjacent acid to weight percent acid in the copolymer of from about 0.5 to about 0.8.
Claim 5
Dependent Claim
14 words
The copolymer of claim 3 wherein said α,β-ethylenically unsaturated carboxylic acid is methacrylic acid.
Claim 6
Dependent Claim
19 words
The copolymer of claim 4 containing on a weight basis in excess of 10 to about 18 percent acid.
Claim 7
Dependent Claim
140 words
A compositionally uniform but nonrandom ionomer of ethylene and α,β-ethylenically unsaturated carboxylic acid, said acid having from 3 to 8 carbon atoms, said copolymer containing, on a weight basis, from about 6 to about 35 percent acid, having from about 5 percent to about 90 percent of the carboxylic acid groups ionized by neutralization with metal cations having an ionized valence of from one to three inclusive, when the unsaturated acid is a monocarboxylic acid, and an ionized valence of one, when the unsaturated acid is a dicarboxylic acid and said metal cations being selected from the group consisting of uncomplexed and complexed metal ions, said ionomer having a melt index of from about 0.01 to about 100 and a ratio of weight percent adjacent acid to weight percent acid in the copolymer of from about 0.44 to about 1.0.
Claim 8
Dependent Claim
140 words
A compositionally uniform but nonrandom ionomer of ethylene and α,β-ethylenically unsaturated carboxylic acid, said acid having from 3 to 8 carbon atoms, said copolymer containing, on a weight basis, from about 6 to about 35 percent acid, having from about 5 percent to about 90 percent of the carboxylic acid groups ionized by neutralization with metal cations having an ionized valence of from one to three inclusive, when the unsaturated acid is a monocarboxylic acid, and an ionized valence of one, when the unsaturated acid is a dicarboxylic acid and said metal cations being selected from the group consisting of uncomplexed and complexed metal ions, said ionomer having a melt index of from about 0.01 to about 100 and a ratio of weight percent adjacent acid to weight percent acid in the copolymer of from about 0.44 to about 1.0.
Claim 9
Dependent Claim
29 words
The ionomer of claim 6 containing on a weight basis of 10 to about 25 percent acid and having a melt index of from about 0.2 to about 30.0.
Claim 10
Dependent Claim
27 words
The ionomer of claim 7 having a ratio of weight percent adjacent acid to weight percent acid in the copolymer of from about 0.5 to about 0.8.
Claim 11
Dependent Claim
15 words
The ionic copolymer of claim 8 wherein said α,β-ethylenically unsaturated carboxylic acid is methacrylic acid.
Claim 12
Dependent Claim
19 words
The ionomer of claim 9 containing on a weight basis in excess of 10 to about 18 percent acid.
Claim 13
Dependent Claim
200 words
A process of preparing in a constant environment stirred autoclave a compositionally uniform but nonrandom copolymer of ethylene and an α,β-ethylenically unsaturated carboxylic acid, said acid having from 3 to 8 carbon atoms and said copolymer containing, on a weight basis, from about 6 to about 35 percent acid, having a melt index of from about 0.1 to about 800, and having a ratio of weight percent adjacent acid to weight percent acid in the copolymer of from about 0.44 to about 1.0, said process comprising continuously charging ethylene, said acid and free radical initiator into a reaction zone maintained in a steady state at a pressure of from 0 to about 50 psi above, and at a temperature of from 0° to about 15° C. above that needed to maintain a single phase reaction mixture at the given concentration of copolymer in the reaction mixture and at the given acid comonomer concentration in the copolymer, the ethylene and acid being charged in a ratio of from about 15:1 to about 200:1, respectively, converting from about 5 to about 20 percent by weight of the monomers to copolymer, and continuously removing the copolymer and unreacted monomer from the reaction zone.
Claim 14
Dependent Claim
200 words
A process of preparing in a constant environment stirred autoclave a compositionally uniform but nonrandom copolymer of ethylene and an α,β-ethylenically unsaturated carboxylic acid, said acid having from 3 to 8 carbon atoms and said copolymer containing, on a weight basis, from about 6 to about 35 percent acid, having a melt index of from about 0.1 to about 800, and having a ratio of weight percent adjacent acid to weight percent acid in the copolymer of from about 0.44 to about 1.0, said process comprising continuously charging ethylene, said acid and free radical initiator into a reaction zone maintained in a steady state at a pressure of from 0 to about 50 psi above, and at a temperature of from 0° to about 15° C. above that needed to maintain a single phase reaction mixture at the given concentration of copolymer in the reaction mixture and at the given acid comonomer concentration in the copolymer, the ethylene and acid being charged in a ratio of from about 15:1 to about 200:1, respectively, converting from about 5 to about 20 percent by weight of the monomers to copolymer, and continuously removing the copolymer and unreacted monomer from the reaction zone.
Claim 15
Dependent Claim
23 words
The process of claim 11 wherein the ethylene and acid is charged in a ratio of from about 20:1 to about 100:1, respectively.
Claim 16
Dependent Claim
22 words
The process of claim 12 wherein from about 8 to about 16 percent by weight of the monomers is converted to copolymer.
Claim 17
Dependent Claim
11 words
The process of claim 11 wherein the acid is methacrylic acid.
Claim 18
Dependent Claim
29 words
The process of claim 14 wherein the copolymer has a ratio of percent adjacent acid to weight percent acid in the copolymer of from about 0.5 to about 0.8.
Claim 19
Dependent Claim
34 words
The process of claim 15 wherein the reaction zone is maintained at a temperature of from about 150° to about 175° C. and at a pressure of from about 23,500 to about 24,500 psi.
Claim 20
Dependent Claim
22 words
The process of claim 16 wherein the ethylene and acid is charged in a ratio of from about 20:1 to about 100:1.
Claim 21
Dependent Claim
22 words
The process of claim 17 wherein from about 8 to about 16 percent by weight of the monomers is converted to copolymer.
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) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |