Patent US4356110A successfully refreshed from Google Patents.
US4356110A
Expired / Lapsed
US
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Secondary stabilizer
Assignee: Perstorp AB
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Filing: 1978-10-30
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Granted: 1982-10-26
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Expires: 1998-10-30
Abstract
Abstract Secondary stabilizer for vinyl chloride polymers consisting of a solid mixture obtained by melting together pentaerythritol and at least one of the compounds selected from the group consisting of dipentaerythritol, tripentaerythritol, trimethylol propane, neopentyl glycol, trimethylol ethane, anhydroennea heptitol, sorbitol, mannitol, bisphenol A and other organic hydroxy compounds containing at least two hydroxy groups. The stabilizer is characterized in that the mixture has the form of a dispersion of very fine-grained particles in a suitable liquid grinding agent, which dispersion has been obtained by wet grinding said mixture in said grinding agent.
Inventors
- 👤 Bengt A. L. Sallmen
- 👤 Carl-Axel E. Sjogreen
- 👤 Mans O. Mansson
- 👤 Keith F. R. Ogemark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:14
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/05; C08K5/053; C08K5/13
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
86 words
A secondary stabilizer for vinyl chloride polymers comprising particles of a mixture of pentaerythritol and a second organic compound having at least two hydroxyl groups dispersed in a liquid carrier in which the said mixture has been ground, said particles having been prepared by melting together the pentaerythritol and said second organic compound having at least two hydroxyl groups, solidifying the resulting molten mixture, and grinding the resulting solid white mixed with said liquid carrier to form a dispersion of solid particles in the liquid carrier.
Claim 2
Dependent Claim
86 words
A secondary stabilizer for vinyl chloride polymers comprising particles of a mixture of pentaerythritol and a second organic compound having at least two hydroxyl groups dispersed in a liquid carrier in which the said mixture has been ground, said particles having been prepared by melting together the pentaerythritol and said second organic compound having at least two hydroxyl groups, solidifying the resulting molten mixture, and grinding the resulting solid white mixed with said liquid carrier to form a dispersion of solid particles in the liquid carrier.
Claim 3
Dependent Claim
23 words
The stabilizer of claim 1 wherein the said mixture contains 45-99.5 percent by weight pentaerythritol and the remainder of a second polyhydric alcohol.
Claim 4
Dependent Claim
73 words
A process for making a secondary stabilizer for a vinyl chloride polymer which comprises melting together pentaerythritol and a second organic compound having at least two hydroxyl groups, cooling the melt until solidified, mixing the resulting solid with a liquid carrier, and grinding the solid while mixed with the liquid carrier to form a dispersion of mixed pentaerythritol and said second organic compound having at least two hydroxyl groups in the liquid carrier.
Claim 5
Dependent Claim
73 words
A process for making a secondary stabilizer for a vinyl chloride polymer which comprises melting together pentaerythritol and a second organic compound having at least two hydroxyl groups, cooling the melt until solidified, mixing the resulting solid with a liquid carrier, and grinding the solid while mixed with the liquid carrier to form a dispersion of mixed pentaerythritol and said second organic compound having at least two hydroxyl groups in the liquid carrier.
Claim 6
Dependent Claim
38 words
The secondary stabilizer of claim 1 wherein the said second organic compound having at least two hydroxyl groups is selected from the group consisting of dipentaerythritol, tripentaerythritol, trimethylol propane, neopentyl glycol, trimethylol ethane, sorbitol, mannitol and bisphenol A.
Claim 7
Dependent Claim
66 words
In a process for preparing a stabilizer for stabilizing a vinyl chloride polymer wherein pentaerythritol is melted together with a second organic compound having at least two hydroxyl groups and the resulting melt is ground into fine particles, the improvement which comprises grinding said melt in a liquid carrier to form a secondary stabilizer for a vinyl chloride polymer which is suspended in the liquid carrier.
Claim 8
Dependent Claim
66 words
In a process for preparing a stabilizer for stabilizing a vinyl chloride polymer wherein pentaerythritol is melted together with a second organic compound having at least two hydroxyl groups and the resulting melt is ground into fine particles, the improvement which comprises grinding said melt in a liquid carrier to form a secondary stabilizer for a vinyl chloride polymer which is suspended in the liquid carrier.
References Cited (Backward Citations)
US3285868A
Cited
GB1400919A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |