US3716505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for suspension polymerization
Assignee: Fujifilm Holdings Corp
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Filing: 1970-05-22
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Granted: 1973-02-13
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Expires: 1990-05-22
Abstract
Abstract A process for suspension polymerization of vinyl monomers in an aqueous liquid medium wherein an inorganic compound difficultly soluble in the liquid medium and a resinous substance, having a solubility parameter value of from 7.8 to 16.1 and being soluble in the vinyl monomers are kneaded in advance with the vinyl monomers, and the kneaded mixture is then suspended in the liquid medium to polymerize the vinyl monomers.
Inventors
- 👤 K Ohe
- 👤 D Nishio
- 👤 S Sadamtsu
- 👤 H Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:52
CPC Classifications
C; C08; C08F; C08F283/00; C08F2/00; C08F2/12; C08F2/16; C08F2/18; C08F251/00; C08F251/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
113 words
In a process for producing a granular polymer by suspension polymerization, which comprises kneading a monomeric composition consisting essentially of a. at least one vinyl monomer, and b. a vinyl monomer polymerization initiator, the improvement which comprises: kneading into said monomeric composition, the following: c. small particles of an inorganic compound, having a solubility in water of not more than 10 percent, and d. a resinous substance, acting as a fluidizing agent, having a solubility parameter value within the range of from 7.8 to 16.1 and being soluble in said monomeric composition, and subsequently kneading said composition and then suspending the kneaded composition in an aqueous liquid medium to polymerize the vinyl monomer.
Claim 2
Dependent Claim
113 words
In a process for producing a granular polymer by suspension polymerization, which comprises kneading a monomeric composition consisting essentially of a. at least one vinyl monomer, and b. a vinyl monomer polymerization initiator, the improvement which comprises: kneading into said monomeric composition, the following: c. small particles of an inorganic compound, having a solubility in water of not more than 10 percent, and d. a resinous substance, acting as a fluidizing agent, having a solubility parameter value within the range of from 7.8 to 16.1 and being soluble in said monomeric composition, and subsequently kneading said composition and then suspending the kneaded composition in an aqueous liquid medium to polymerize the vinyl monomer.
Claim 3
Dependent Claim
33 words
A process according to claim 1 wherein said resinous substance is a relatively polar resin selected from the group consisting of cellulose ether resins, polyurethane resins, amino resins, epoxy resins and alkyd resins.
Claim 4
Dependent Claim
27 words
A process according to claim 2 wherein said resinous substance is used in an amount of 0.001 to 10 percent by weight based on the vinyl monomer.
Claim 5
Dependent Claim
27 words
A process according to claim 3 wherein said resinous substance is used in an amount of 0.001 to 1 percent by weight based on the vinyl monomer.
Claim 6
Dependent Claim
31 words
A process according to claim 2 wherein said inorganic compound is present in an amount of from 10 to 300 percent by weight based on the weight of the vinyl monomer.
Claim 7
Dependent Claim
20 words
A process according to claim 2 wherein the polymer particle obtained has an average diameter of 15 microns or less.
Claim 8
Dependent Claim
14 words
A process according to claim 2 wherein said resinous substance is cellulose ether resin.
References Cited (Backward Citations)
US2171765A
Cited
US2588398A
Cited
US3205204A
Cited
US3222343A
Cited
US3198775A
Cited
US3458603A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |