Patent US4299885A successfully refreshed from Google Patents.
US4299885A
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Encapsulated phosphites
Assignee: Borg Warner Corp
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Filing: 1979-08-24
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Granted: 1981-11-10
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Expires: 1999-08-24
Abstract
Abstract An improved polymer additive characterized by excellent stability to hydrolysis. Dialkyl pentaerythritol diphosphites are encapsulated in a petroleum or ester wax and thereby rendered relatively immune to decomposition under ordinary conditions of storage. At the same time, the wax coating is sufficiently low melting as to present no problem during milling operations at elevated temperatures, for example, where the heat stabilizing qualities of the dialkyl pentaerythritol diphosphite are required.
Inventors
- 👤 Ved K. Sahajpal
- 👤 Jacques Delaere
- 👤 Zigmunt K. Kromolicki
- 👤 Mattheus R. Settels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:07
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/10; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
35 words
An encapsulated organic phosphite composition stable to hydrolysis under ordinary conditions of storage comprising a dialkyl pentaerythritol diphosphite wherein the alkyl groups each contain 10-20 carbon atoms, coated with a glycerol ester of montanic acid.
Claim 2
Dependent Claim
35 words
An encapsulated organic phosphite composition stable to hydrolysis under ordinary conditions of storage comprising a dialkyl pentaerythritol diphosphite wherein the alkyl groups each contain 10-20 carbon atoms, coated with a glycerol ester of montanic acid.
Claim 3
Dependent Claim
16 words
The encapsulated organic phosphite composition of claim 1 wherein the alkyl groups are each stearyl groups.
Claim 4
Dependent Claim
21 words
The encapsulated organic phosphite composition of claim 1 wherein the dialkyl pentaerythritol diphosphite is a mixture of spiro and caged isomers.
Claim 5
Dependent Claim
20 words
The encapsulated organic phosphite composition of claim 3 wherein the spiro isomer comprises at least about 80% of said mixture.
Claim 6
Dependent Claim
18 words
The encapsulated organic phosphite composition of claim 1 wherein the dialkyl pentaerythritol diphosphite is substantially pure spiro isomer.
Claim 7
Dependent Claim
65 words
A process for encapsulating a dialkyl pentaerythritol diphosphite wherein the alkyl groups each contain 10-20 carbon atoms comprising preparing a homogeneous liquid mixture of a glycerol ester of montanic acid in a solvent in which the diphosphite is relatively insoluble, preparing a second mixture of said liquid mixture and the diphosphite agitating this second mixture, and removing the solvent from the second mixture by evaporation.
Claim 8
Dependent Claim
65 words
A process for encapsulating a dialkyl pentaerythritol diphosphite wherein the alkyl groups each contain 10-20 carbon atoms comprising preparing a homogeneous liquid mixture of a glycerol ester of montanic acid in a solvent in which the diphosphite is relatively insoluble, preparing a second mixture of said liquid mixture and the diphosphite agitating this second mixture, and removing the solvent from the second mixture by evaporation.
Claim 9
Dependent Claim
17 words
The process of claim 6 wherein the alkyl groups of the dialkyl pentaerythritol diphosphite are stearyl groups.
Claim 10
Dependent Claim
25 words
The process of claim 6 wherein the solvent is an aliphatic hydrocarbon having a boiling point of from about 50° C. to about 100° C.
Claim 11
Dependent Claim
22 words
The process of claim 6 wherein the temperature of the second mixture is below the melting point of the dialkyl pentaerythritol diphosphite.
References Cited (Backward Citations)
US1692996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |