US4282337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing graft polymers of α,α'-disubstituted-β-propiolactones on isobutylene-triene-copolymers
Assignee: Anic SpA
•
Filing: 1980-04-25
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Granted: 1981-08-04
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Expires: 2000-04-25
Abstract
Abstract Graft-polymers of,α,α'-disubstituted β-propiolactones on isobutylene-triene copolymers are prepared by reacting an isobutylene-triene copolymer with maleic anhydride and possibly with other functionalizing agents adapted to introduce acid and ester groups in the copolymer molecule and by neutralizing or hydrolyzing, or both, with a tetraalkylammonium base, said functional groups, said neutralization or hydrolysis, or both, being followed by a grafting reaction with pivalolactone.
Inventors
- 👤 Arnaldo Roggero
- 👤 Alberto Gandini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:47
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/46; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
79 words
A process for preparing graft polymers of α,α'-dialkylsubstituted β-propiolactones which comprises reacting a copolymer of isobutylene and a polyconjugated polyene linear hydrocarbon containing at least three conjugated double bonds with a dienophile under Diels-Alder reaction conditions to provide a functionalized copolymer substituted with a group selected from an acid, anhydride or ester group, and then reacting said functionalized copolymer with a α,α'dialkylsubstituted β-propiolactone in a solvent at a temperature of from -80° C. to 20° C., and recovering product.
Claim 2
Dependent Claim
79 words
A process for preparing graft polymers of α,α'-dialkylsubstituted β-propiolactones which comprises reacting a copolymer of isobutylene and a polyconjugated polyene linear hydrocarbon containing at least three conjugated double bonds with a dienophile under Diels-Alder reaction conditions to provide a functionalized copolymer substituted with a group selected from an acid, anhydride or ester group, and then reacting said functionalized copolymer with a α,α'dialkylsubstituted β-propiolactone in a solvent at a temperature of from -80° C. to 20° C., and recovering product.
Claim 3
Dependent Claim
32 words
A process as claimed in claim 1 wherein said functionalized copolymer, substituted with an acid or anhydride group, is treated with a tetraalkylammonium base in an amount to neutralize said acidic groups.
Claim 4
Dependent Claim
14 words
A process as claimed in claim 2 wherein said tetraalkylammonium base is tetrabutylammonium hydroxide.
Claim 5
Dependent Claim
30 words
A process as claimed in claim 1 wherein said functionalized copolymer, substituted with an ester group, is treated with a tetraalkylammonium base in an amount to hydrolyze said ester groups.
Claim 6
Dependent Claim
14 words
A process as claimed in claim 4 wherein said tetraalkylammonium base is tetrabutylammonium hydroxide.
Claim 7
Dependent Claim
23 words
A process as claimed in claim 1 wherein said polyconjugated polyene linear hydrocarbon is selected from 2,4,6-octatriene, 2,6-dimethyl-2,4,6-octatriene, 1,6-diphenyl-1,3,5-hexatriene, 1,3,5-heptatriene, 1,3,5-hexatriene or 2,7-dimethyl-2,4,6-octatriene.
Claim 8
Dependent Claim
26 words
A process as claimed in claim 1 wherein said dienophile is selected from maleic anhydride, acrylic acid esters, methacrylic acid esters, acrylic acid or methacrylic acid.
Claim 9
Dependent Claim
19 words
A process as claimed in claim 1 wherein said copolymer is obtained by the catalytic dehydrohalogenation of chlorobutyl rubber.
Claim 10
Dependent Claim
18 words
A process as claimed in claim 1 wherein said α,α'-dialkylsubstituted β-propiolactone is selected from α,α-dimethyl-β-propiolactone (pivalolactone) or α,α-di-n-propyl-β-propiolactone.
Claim 11
Dependent Claim
28 words
A process as claimed in claim 1 wherein said solvent is selected from an aliphatic, aromatic, cycloaliphatic or alkylaromatic hydrocarbon solvent or a polar solvent or mixtures thereof.
Claim 12
Dependent Claim
17 words
A process as claimed in claim 10 wherein said solvent is a mixture of toluene and tetrahydrofuran.
Claim 13
Dependent Claim
17 words
A process as claimed in claim 1 wherein said temperature is between 20° C. and 120° 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) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |