Patent US2696474A successfully refreshed from Google Patents.
US3933731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic composition liberating reduced amounts of toxic gas
Assignee: Cosmo Oil Co Ltd
•
Filing: 1973-09-05
•
Granted: 1976-01-20
•
Expires: 1993-09-05
Abstract
Abstract A novel composite is disclosed which comprises a specific metal-compound additive as well as a plastic material and gypsum and/or calcium sulfite. The composite is improved in that it emits very little or substantially no toxic gas such as sulfur dioxide and hydrogen sulfide when it is burned and when the ash thereof is contacted with water.
Inventors
- 👤 Sueo Machi
- 👤 Yasushi Matui
- 👤 Takayuki Shinano
- 👤 Taiji Aono
- 👤 Yoshiharu Hibi
- 👤 Shozo Oshima
- 👤 Masayuki Kashiki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:34
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/01; C08K3/016; C08K3/18; C08K3/20; C08K3/22; C08K3/24; C08K3/26; C08K3/30; C08K3/34
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
156 words
A composite comprising (1) from about 2 to about 50 parts by weight of a plastic material selected from the group consisting of thermoplastic resins and thermosetting resins, and (2) from about 50 to about 98 parts by weight of a filler composition comprising (i) gypsum and/or calcium sulfite and (ii) an additive of calcium hydroxide in an amount of from about 0.5 to about 60% by weight based on the total weight of said filler composition, characterized in that said composite is improved in that, due to the presence of said additive it emits very little or substantially no sulfur dioxide when it is burned, and also emits very little or substantially no hydrogen sulfide when the ash of said composite remaining after combustion thereof is contacted with water, in spite of the fact that like composites of the prior art usually emit toxic gases when burned or when their ash is contacted with water.
Claim 2
Dependent Claim
156 words
A composite comprising (1) from about 2 to about 50 parts by weight of a plastic material selected from the group consisting of thermoplastic resins and thermosetting resins, and (2) from about 50 to about 98 parts by weight of a filler composition comprising (i) gypsum and/or calcium sulfite and (ii) an additive of calcium hydroxide in an amount of from about 0.5 to about 60% by weight based on the total weight of said filler composition, characterized in that said composite is improved in that, due to the presence of said additive it emits very little or substantially no sulfur dioxide when it is burned, and also emits very little or substantially no hydrogen sulfide when the ash of said composite remaining after combustion thereof is contacted with water, in spite of the fact that like composites of the prior art usually emit toxic gases when burned or when their ash is contacted with water.
Claim 3
Dependent Claim
22 words
The composite of claim 1 in which said plastic material is selected from the group consisting of polyethylene, polypropylene and unsaturated polyester.
Claim 4
Dependent Claim
128 words
A process for preparing a composite comprising (1) a plastic material and (2) a filler composition comprising (i) gypsum and/or calcium sulfite and (ii) an additive of calcium hydroxide, said process comprising adding about 0.5 to about 60% of the total weight of said filler composition of said calcium hydroxide additive to a filler material comprising gypsum and/or calcium sulfite to make said filler composition, mixing from about 2 to about 50 parts by weight of a plastic material with from about 50 to about 98 parts by weight of said filler composition, and then kneading the mixture thus obtained in a kneader at a temperature within the range of from about 80°C to about 200°C for a period of from about 1 minute to about 30 minutes.
Claim 5
Dependent Claim
128 words
A process for preparing a composite comprising (1) a plastic material and (2) a filler composition comprising (i) gypsum and/or calcium sulfite and (ii) an additive of calcium hydroxide, said process comprising adding about 0.5 to about 60% of the total weight of said filler composition of said calcium hydroxide additive to a filler material comprising gypsum and/or calcium sulfite to make said filler composition, mixing from about 2 to about 50 parts by weight of a plastic material with from about 50 to about 98 parts by weight of said filler composition, and then kneading the mixture thus obtained in a kneader at a temperature within the range of from about 80°C to about 200°C for a period of from about 1 minute to about 30 minutes.
Claim 6
Dependent Claim
22 words
The process of claim 3 in which said plastic material is selected from the group consisting of polyethylene, polypropylene and unsaturated polyester.
Claim 7
Dependent Claim
24 words
A composite in accordance with claim 1, wherein said plastic material is a thermoplastic resin and said gypsum and/or calcium sulfite is calcium sulfite.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |