Patent US5216096A successfully refreshed from Google Patents.
US5216096A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of cross-linked polymer particles
Assignee: JSR Corp
•
Filing: 1991-09-24
•
Granted: 1993-06-01
•
Expires: 2011-09-24
Abstract
Abstract A process for the preparation of highly crosslinked polymer particles from polymerizable vinyl monomers comprising 15% by weight or more of a crosslinking vinyl monomer. The process comprises: providing an organic solvent, a mixture of organic solvents, or a mixture of at least one organic solvent and water which can dissolve the polymerizable vinyl monomers but cannot dissolve the polymer which is produced by the polymerization of the polymerizable vinyl monomers, the solubility in water of the polymerizable vinyl monomer being not more than 30% by weight, dispersing the polymerizable vinyl monomers into the organic solvent, the mixture of organic solvents, or the mixture of the at least one organic solvent and water, and polymerizing the polymerizable vinyl monomers in the presence of a dispersion stabilizer and a radical polymerization initiator. The crosslinked polymer particles have a comparatively uniform particle size within the particle size range of 0.1-10 μm. They are useful as a slip property improver for plastic films, a spacer for liquid crystal display devices, a carrier for chromatography, and a standard sample for microscopic examination.
Inventors
- 👤 Masayuki Hattori
- 👤 E. David Sudol
- 👤 Mohamed S. El-Aasser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:48
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/04; C08F2/06; C08F2/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
104 words
A process for preparing highly crosslinked polymer particles, the process comprising: dispersing polymerizable vinyl monomer in a single phase dispersion medium comprising a solvent, said polymerizable vinyl monomer comprising at least 15% by weight of crosslinking vinyl monomer, said solvent comprising at least one organic compound, said polymerizable vinyl monomer being soluble in said solvent, the solubility in water of said polymerizable vinyl monomer being not more than 30% by weight; and polymerizing said polymerizable vinyl monomer in the presence of a dispersion stabilizer and a radical polymerization initiator to produce polymer of said polymerizable vinyl monomer, said polymer being insoluble in said solvent.
Claim 2
Dependent Claim
104 words
A process for preparing highly crosslinked polymer particles, the process comprising: dispersing polymerizable vinyl monomer in a single phase dispersion medium comprising a solvent, said polymerizable vinyl monomer comprising at least 15% by weight of crosslinking vinyl monomer, said solvent comprising at least one organic compound, said polymerizable vinyl monomer being soluble in said solvent, the solubility in water of said polymerizable vinyl monomer being not more than 30% by weight; and polymerizing said polymerizable vinyl monomer in the presence of a dispersion stabilizer and a radical polymerization initiator to produce polymer of said polymerizable vinyl monomer, said polymer being insoluble in said solvent.
Claim 3
Dependent Claim
37 words
A process according to claim 1, wherein said crosslinking vinyl monomer is one or more compounds selected from the group consisting of compounds having two or more copolymerizable double bonds in the molecule and polyvalent acrylate compounds.
Claim 4
Dependent Claim
29 words
A process according to claim 1, wherein said crosslinking vinyl monomer is one or more compounds selected from the group consisting of divinylbenzene, ethylene glycol dimethacrylate, and trimethylolpropane trimethacrylate.
Claim 5
Dependent Claim
39 words
A process according to claim 1, wherein said at least one organic compound comprises one or more compounds selected from the group consisting of alcohols, ether alcohols, hydrocarbons, ethers, acetals, ketones, esters, acids, and sulfur- or nitrogen-containing organic compounds.
Claim 6
Dependent Claim
34 words
A process according to claim 1, wherein the total amount of said solvent is more than 500 parts by weight per 100 parts by weight of the total weight of said polymerizable vinyl monomer.
Claim 7
Dependent Claim
43 words
A process according to claim 1, wherein said dispersion stabilizer comprises one or more compounds selected from the group consisting of poly(vinyl pyrrolidone), poly(vinyl methyl ether), polyethyleneimine, polyacrylic acid, poly(vinyl alcohol), vinyl acetate copolymer, ethyl cellulose, hydroxypropyl cellulose, and sorbitan stearic acid monoester.
Claim 8
Dependent Claim
36 words
A process according to claim 1, wherein said radical polymerization initiator comprises one or more compounds selected from the group consisting of 2,2'-azobisisobutyronitrile, 4,4'-azobis(4-cyanopentaonic acid), 2,2'-azobis(2-methylbutyronitrile), 2,2'-azobis(2,4-dimethylvaleronitrile), benzoyl peroxide, lauroyl peroxide, octanoyl peroxide, and 3,3',5-trimethylhexanoyl peroxide.
Claim 9
Dependent Claim
20 words
A process according to claim 1, wherein said polymerizing is carried out in the further presence of a co-stabilization agent.
Claim 10
Dependent Claim
32 words
A process according to claim 8, wherein said co-stabilization agent is one or more compounds selected from the group consisting of anionic surfactants, nonionic surfactants, quaternary ammonium salts, and long chain alcohols.
Claim 11
Dependent Claim
20 words
A process according to claim 1, wherein said polymerizing is carried out by using crosslinked polymer particles as seed particles.
Claim 12
Dependent Claim
105 words
A process according to claim 10, wherein said seed particles are crosslinked polymer particles which are produced by dispersing polymerizable vinyl monomer in a solvent, said polymerizable vinyl monomer comprising at least 15% by weight of crosslinking vinyl monomer, said solvent comprising at least one organic compound, said polymerizable vinyl monomer being soluble in said solvent, the solubility in water of said polymerizable vinyl monomer being not more than 30% by weight; and polymerizing said polymerizable vinyl monomer in the presence of a dispersion stabilizer and a radical polymerization initiator to produce polymer of said polymerizable vinyl monomer, said polymer being insoluble in said solvent.
Claim 13
Dependent Claim
23 words
A process according to claim 1, wherein said polymerizing is carried out by using a latex produced by emulsion polymerization as seed particles.
Claim 14
Dependent Claim
19 words
A process as recited in claim 1, wherein said solvent comprises a mixture of at least two organic compounds.
Claim 15
Dependent Claim
13 words
A process as recited in claim 1, wherein said solvent further comprises water.
Claim 16
Dependent Claim
13 words
A process as recited in claim 13, wherein said solvent further comprises water.
References Cited (Backward Citations)
US4174430A
Cited
US4419245A
Cited
US4617249A
Cited
US4870143A
Cited
US4906698A
Cited
US4908392A
Cited
US4952651A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-31 | 1996-11-30 | 1997-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-31 | 2000-11-30 | 2001-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-31 | 2004-11-30 | 2005-06-01 | $7700.00 | Window Closed / Lapsed |