US3958044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for coating inorganic compounds in powdered form
Assignee: Lion Fat and Oil Co Ltd
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Filing: 1974-02-01
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Granted: 1976-05-18
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Expires: 1994-02-01
Abstract
Abstract A transition metal compound in powdered form or a mixture of a transition metal compound and other inorganic compounds in powdered form can be effectively coated with a polymer by contacting such powder with a vinyl monomer in the presence of hydrogen sulfite ions (HSO 3 - ).
Inventors
- 👤 Tadashi Yamaguchi
- 👤 Takayuki Ono
- 👤 Hirobumi Tanaka
- 👤 Hiroshi Hoshi
- 👤 Michio Hirakawa
- 👤 Isao Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:30
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/006; B01J2/003; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
144 words
A method of producing vinyl-polymer coated inorganic material hich comprises contacting a powdery inorganic material consisting essentially of at least about 0.5% by weight of a transition metal compound and the balance of an inert inorganic material, the weight of said transition metal compound being calculated as a metal based on the inert inorganic material, with a coating material which comprises at least about 0.1 part by weight per 100 parts of weight of said transition metal compound of a vinyl monomer in an aqueous polymerization medium containing a polymerization initiator consisting essentially of hydrogen sulfite ions of the formula HSO 3 - in the amount, calculated as sulfur dioxide, of about 0.01-100 parts by weight per 100 parts by weight of said monomer, whereby said monomer polymerizes in said medium as a coating on said powdery material, and recovering the coated powdery material.
Claim 2
Independent Claim
144 words
A method of producing vinyl-polymer coated inorganic material hich comprises contacting a powdery inorganic material consisting essentially of at least about 0.5% by weight of a transition metal compound and the balance of an inert inorganic material, the weight of said transition metal compound being calculated as a metal based on the inert inorganic material, with a coating material which comprises at least about 0.1 part by weight per 100 parts of weight of said transition metal compound of a vinyl monomer in an aqueous polymerization medium containing a polymerization initiator consisting essentially of hydrogen sulfite ions of the formula HSO 3 - in the amount, calculated as sulfur dioxide, of about 0.01-100 parts by weight per 100 parts by weight of said monomer, whereby said monomer polymerizes in said medium as a coating on said powdery material, and recovering the coated powdery material.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said polymerization is carried out for at least about 0.5 hours.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein said polymerization is accelerated by heating said medium.
Claim 5
Dependent Claim
28 words
The method of claim 1 wherein at least about 0.5 but less than about 50% by weight of said transition metal compound is present in said powdery material.
Claim 6
Dependent Claim
30 words
A method according to claim 1 wherein said vinyl monomer is an alkyl ester of acrylic acid or methacrylic acid, styrene or a mixture of styrene with another vinyl comonomer.
Claim 7
Dependent Claim
20 words
A method according to claim 1 wherein said hydrogen sulfite ion-containing aqueous medium is an aqueous solution of sulfur dioxide.
Claim 8
Dependent Claim
13 words
A method according to claim 1 wherein said vinyl monomer is vinyl acetate.
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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) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |