US3719651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxybutylmethylcellulose as a protective colloid in vinyl monomer polymerization
Assignee: Dow Chemical Co
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Filing: 1971-02-01
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Granted: 1973-03-06
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Expires: 1991-02-01
Abstract
Abstract An improvement in the process for preparing polymers from substantially water-insoluble polymerizable ethylenically unsaturated monomer in aqueous suspension wherein such monomers form polymers which are insoluble in their monomer, said improvement comprising the use of hydroxybutylmethylcellulose as the protective colloid in the water-phase of an oil-in-water suspension system.
Inventors
- 👤 G Greminger
- 👤 R Glomski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:35
CPC Classifications
C; C08; C08F; C08F251/00; C08F251/02; C08B; C08B11/00; C08B11/193; Y; Y10; Y10S; Y10S526/00; Y10S526/91
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
61 words
In the process of polymerizing vinyl chloride monomer in non-emulsified aqueous suspension in the presence of a protective colloid the improvement consisting of: using as said protective colloid from about 0.05 to 5 percent, based on monomer weight of a water-soluble hydroxybutylmethylcellulose ether having from about 17 to 33 weight percent methoxyl and from about 2 to 13 weight percent hydroxybutyl.
Claim 2
Dependent Claim
61 words
In the process of polymerizing vinyl chloride monomer in non-emulsified aqueous suspension in the presence of a protective colloid the improvement consisting of: using as said protective colloid from about 0.05 to 5 percent, based on monomer weight of a water-soluble hydroxybutylmethylcellulose ether having from about 17 to 33 weight percent methoxyl and from about 2 to 13 weight percent hydroxybutyl.
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein said hydroxybutylmethylcellulose contains from about 28 to 33 weight percent methoxyl and from about 2 to 6 weight percent hydroxybutyl.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |