Patent US3966673A successfully refreshed from Google Patents.
US3966673A
Expired / Lapsed
US
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Polyvinylchloride polymer inhibited against release of hydrogen chloride at elevated temperature
Assignee: Dynamit Nobel AG
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Filing: 1973-07-13
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Granted: 1976-06-29
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Expires: 1993-07-13
Abstract
Abstract Polyvinylchloride inhibited against release of hydrogen chloride at elevated temperature is produced by polymerizing vinyl chloride in a reaction medium having finely divided calcium carbonate dispersed therein.
Inventors
- 👤 Siegmund Frick
- 👤 Wilhelm Gresser
- 👤 Gunther Meyer
- 👤 Gerhard Bier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:41
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
Process of preparing vinyl chloride polymer inhibited against release of hydrogen chloride at elevated temperature, which comprises producing the polymer by polymerizing vinyl chloride in a reaction medium having calcium carbonate dispersed therein for in situ incorporation of calcium carbonate in the polymer in dispersed condition, the proportion of calcium carbonate being 90-105 percent of the stoichiometric amount which is 50.04 g CaCO 3 per 62.5 grams of vinyl chloride in the polymer.
Claim 2
Dependent Claim
73 words
Process of preparing vinyl chloride polymer inhibited against release of hydrogen chloride at elevated temperature, which comprises producing the polymer by polymerizing vinyl chloride in a reaction medium having calcium carbonate dispersed therein for in situ incorporation of calcium carbonate in the polymer in dispersed condition, the proportion of calcium carbonate being 90-105 percent of the stoichiometric amount which is 50.04 g CaCO 3 per 62.5 grams of vinyl chloride in the polymer.
Claim 3
Dependent Claim
12 words
Process according to claim 1, the calcium carbonate being precipitated calcium carbonate.
Claim 4
Dependent Claim
23 words
Process according to claim 1, and including in the reaction medium another ethylenically unsaturated monomer for production of a copolymer of vinyl chloride.
Claim 5
Dependent Claim
18 words
Process according to claim 1, the calcium carbonate having a surface area of about 6-50 m 2 /g.
Claim 6
Dependent Claim
18 words
Process according to claim 1, the calcium carbonate having a surface area of about 10-25 m 2 /g.
Claim 7
Dependent Claim
32 words
Process according to claim 1, and carrying out the polymerization in a vessel outfitted with a spiral, wall-running band mixer and agitating the reaction medium with the band mixer during the polymerization.
Claim 8
Dependent Claim
9 words
Polyvinylchloride plastic produced by the process of claim 1.
Claim 9
Dependent Claim
8 words
Shaped article of plastic according to claim 7.
Claim 10
Dependent Claim
13 words
Process according to claim 1, wherein the vinyl chloride polymer is polyvinyl chloride.
References Cited (Backward Citations)
US3265644A
Cited
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 |