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Patent US4387264A successfully refreshed from Google Patents.
US4387264A
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US
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Diolefin monomer purification process for anionic polymerization
Assignee: Lyondell Chemical Technology LP
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Filing: 1981-05-04
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Granted: 1983-06-07
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Expires: 2001-05-04
Abstract
Abstract An improved process for the purification of diolefin monomers for anionic polymerization is disclosed. The purification process of this invention results in polymer which exhibits excellent chain growing.
Inventors
- 👤 Le-Khac Bi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:53
CPC Classifications
B; B01; B01D; B01D15/00; C; C07; C07C; C07C7/00; C07C7/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
In a method of purifying rubber grade diene monomers for anionic polymerization of the type wherein a rubber grade diene monomer is sequentially passed through molecular sieves and then adsorption alumina just prior to being introduced into the polymerization reaction vessel, the improvement comprising: purifying the rubber grade diene monomer by sequentially passing it through molecular sieves, then through adsorption alumina, and then through molecular sieves before introducing the purified rubber grade diene into the polymerization reaction vessel, said molecular sieves being selected from the group consisting of 3A and 4A type molecular sieves.
Claim 2
Dependent Claim
94 words
In a method of purifying rubber grade diene monomers for anionic polymerization of the type wherein a rubber grade diene monomer is sequentially passed through molecular sieves and then adsorption alumina just prior to being introduced into the polymerization reaction vessel, the improvement comprising: purifying the rubber grade diene monomer by sequentially passing it through molecular sieves, then through adsorption alumina, and then through molecular sieves before introducing the purified rubber grade diene into the polymerization reaction vessel, said molecular sieves being selected from the group consisting of 3A and 4A type molecular sieves.
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) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |