Patent US4070420A successfully refreshed from Google Patents.
US4070420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic elastomers prepared via cationic grafting
Assignee: Bridgestone Firestone Inc
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Filing: 1976-09-15
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Granted: 1978-01-24
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Expires: 1996-09-15
Abstract
Abstract Thermoplastic elastomers having improved high service temperatures and increased tensile strength are prepared by grafting cationic polymerizable monomer, such as alpha-methyl styrene, to halogenated backbone such as chlorinated polybutadiene, said grafting being effected in the presence of inert organic solvent and alkyl aluminum catalyst together with a controlled amount of water to achieve an improved polymerization rate and increased monomer conversion.
Inventors
- 👤 Richard Joseph Ambrose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:38
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
In the process for grafting alpha-methyl styrene from chlorinated polybutadiene in the presence of toluene and trimethyl aluminum, the improvement wherein said grafting is conducted in the presence of from about 1.5 to about 2.5 × 10 -3 M water dissolved in said toluene, said water and toluene being added prior to the addition of said trimethyl aluminum.
Claim 2
Dependent Claim
58 words
In the process for grafting alpha-methyl styrene from chlorinated polybutadiene in the presence of toluene and trimethyl aluminum, the improvement wherein said grafting is conducted in the presence of from about 1.5 to about 2.5 × 10 -3 M water dissolved in said toluene, said water and toluene being added prior to the addition of said trimethyl aluminum.
References Cited (Backward Citations)
US3439065A
Cited
US3904708A
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US3933942A
Cited
US3494983A
Cited
US3669947A
Cited
US3981944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |