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Patent US3725336A successfully refreshed from Google Patents.
US3725336A
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Thermoplastic composition containing coprecipitated fillers and methods of making the fillers
Assignee: Lion Fat and Oil Co Ltd
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Filing: 1971-04-23
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Granted: 1973-04-03
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Expires: 1991-04-23
Abstract
Abstract A method for the preparation of a filler to be used with thermoplastic resins comprising a process of making the mixture of two or three members selected from the group consisting of sulfur dioxide, sulfur trioxide and carbon dioxide act on calcium hydroxide in the presence of water or a process of making either sulfur dioxide or sulfur trioxide or the mixture thereof act on calcium carbonate in the presence of water. Thermoplastic compositions containing the coprecipitated filler mixture have superior physical characteristics when compared to thermoplastic compositions which contain filler mixtures mechanically mixed.
Inventors
- 👤 R Susuki
- 👤 H Hoshi
- 👤 M Hirakawa
- 👤 J Saito
- 👤 K Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:57
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/02; C09; C09C; C09C1/00; C09C1/02; C01; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
26 words
A composition as defined in claim 1, wherein the thermoplastic resin is selected from the group consisting of polyethylene, ethylene propylene copolymer, polyvinyl chloride and polypropylene.
Claim 2
Dependent Claim
102 words
A resin composition consisting essentially of (A) a homogenous mixture of from 10 to 50 percent by weight of a thermoplastic resin and the balance being (B) a filler mixture consisting of (1) calcium carbonate and (2) at least one member selected from the group consisting of calcium sulfite and calcium sulfate, said filler mixture having been prepared by introducing at least one member selected from the group consisting of (a) sulfur dioxide or sulfurous acid and (b) sulfur trioxide or sulfuric acid, into an aqueous suspension of the calcium carbonate, until the pH of the suspension reaches about 10 - 5.
Claim 3
Dependent Claim
26 words
A composition as defined in claim 3, wherein said thermoplastic resin is selected from the group consisting of polyethylene, ethylene propylene copolymer, polyvinyl chloride and polypropylene.
References Cited (Backward Citations)
US3445259A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |