US3967006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry process for the production of plastic-coated inorganic substances
Assignee: Lion Fat and Oil Co Ltd
•
Filing: 1974-02-01
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Granted: 1976-06-29
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Expires: 1994-02-01
Abstract
Abstract Dry process for the production of inorganic granular substances coated with plastics, characterized in that a radical-polymerizable vinylic monomer carried on the surface of an inorganic granular substance is brought in a gaseous phase into contact with gaseous sulfur dioxide to effect polymerization of the monomer. The resulting plastic-coated inorganic substances are useful in various fields of industry, for example, as fillers, construction materials, molding materials, electrode materials, delayed-action fertilizers, etc.
Inventors
- 👤 Tadashi Yamaguchi
- 👤 Takayuki Ono
- 👤 Hiroshi Hoshi
- 👤 Michio Hirakawa
- 👤 Isao Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:28
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/006; B01J2/003
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
76 words
A substantially dry process for producing vinyl polymer coated inorganic particles which comprises applying to core particles of an inorganic granular material a surface coating of a vinyl monomer and suspending said monomer-coated particles in an atmosphere containing gaseous sulfur dioxide in the presence of a small amount of water or lower alcohol sufficient to initiate polymerization of said monomer coating on said core particles in the absence of a radical polymerizing agent for said monomer.
Claim 2
Dependent Claim
76 words
A substantially dry process for producing vinyl polymer coated inorganic particles which comprises applying to core particles of an inorganic granular material a surface coating of a vinyl monomer and suspending said monomer-coated particles in an atmosphere containing gaseous sulfur dioxide in the presence of a small amount of water or lower alcohol sufficient to initiate polymerization of said monomer coating on said core particles in the absence of a radical polymerizing agent for said monomer.
Claim 3
Dependent Claim
19 words
A process according to claim 1 wherein the inorganic granules have a granule size of less than 5 mm.
Claim 4
Dependent Claim
33 words
A process according to claim 1 wherein the radical-polymerizable vinylic monomer is used in an amount sufficient to give 5-100 parts by volume per 100 parts by volume of the inorganic granular substance.
Claim 5
Dependent Claim
27 words
A process according to claim 1 wherein sulfur dioxide is used in an amount of 0.01-100 parts by weight per 100 parts by weight of the monomer.
Claim 6
Dependent Claim
12 words
A process according to claim 1 wherein the monomer is methyl methacrylate.
Claim 7
Dependent Claim
16 words
The process of claim 1 wherein said granular material has a particle size of about 1-100μ.
References Cited (Backward Citations)
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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) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |