US4908271A
Expired / Lapsed
US
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Capsule-shaped polymer particles and process for the production thereof
Assignee: JSR Corp
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Filing: 1988-06-28
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Granted: 1990-03-13
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Expires: 2008-06-28
Abstract
Abstract Capsule-shaped polymer particles and a process for the production thereof are described. In one embodiment of the process, a polymerizable monomer component containing a cross-linkable monomer and a hydrophilic monomer, and an oily substance are finely dispersed in water to prepare an oil-in-water emulsion and then the polymerizable monomer component is polymerized, whereupon capsule-shaped polymer particles containing the oily substance as a core material are obtained. Upon removal of the oily substance in the particles, there are obtained capsule-shaped hollow polymer particles. These capsule-shaped polymer particles are excellent in such properties as mechanical strength and heat resistance, and thus can find many applications.
Inventors
- 👤 Kiyoshi Kasai
- 👤 Masayuki Hattori
- 👤 Hiromi Takeuchi
- 👤 Nobuo Sakurai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:11
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/02; B01J13/06; B01J13/14; B01J13/18; B01J13/185; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
A capsule-shaped polymer particle having a shell portion and a core portion, said shell portion comprising a copolymer prepared by radical copolymerization of vinyl monomers, said copolymer comprising 1-50 wt. % of a cross-linkable monomer, 3-99 wt. % of a hydrophilic monomer, and 0-85 wt. % of at least one monomer copolymerizable with said cross-linkable monomer of hydrophilic monomer, said core portion comprising an oily substance, water or mixtures thereof, and said polymer particle having an outer diameter of 0.2-0.6 micron and an inner diameter of 1/4 to 3/4 of the outer diameter.
Claim 2
Dependent Claim
93 words
A capsule-shaped polymer particle having a shell portion and a core portion, said shell portion comprising a copolymer prepared by radical copolymerization of vinyl monomers, said copolymer comprising 1-50 wt. % of a cross-linkable monomer, 3-99 wt. % of a hydrophilic monomer, and 0-85 wt. % of at least one monomer copolymerizable with said cross-linkable monomer of hydrophilic monomer, said core portion comprising an oily substance, water or mixtures thereof, and said polymer particle having an outer diameter of 0.2-0.6 micron and an inner diameter of 1/4 to 3/4 of the outer diameter.
Claim 3
Dependent Claim
33 words
The capsule-shaped polymer particle of claim 1, wherein said copolymer comprises 2-20 wt. % of said cross-linkable monomer, 50-95 wt. % of said hydrophillic monomer and 0-48 wt. % of said copolymerizable monomer.
Claim 4
Dependent Claim
51 words
The capsule-shaped polymer particle of claim 1, wherein said cross-linkable monomer is divinylbenzene, said hydrophilic monomer is at least one monomer selected from the group consisting of methyl methacrylate, vinylpyridine, 2-hydroxy-ethyl methacrylate, and not more than 20 wt. % of an unsaturated carboxylic acid, and wherein said copolymerizable monomer is styrene.
Claim 5
Dependent Claim
26 words
The capsule-shaped polymer particle of claim 1, wherein the core portion comprises an oily substance having a solubility in water not more than 0.2 wt. %.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-12 | 1993-09-11 | 1994-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-12 | 1997-09-11 | 1998-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-12 | 2001-09-11 | 2002-03-13 | $7700.00 | Window Closed / Lapsed |