Patent US3674705A successfully refreshed from Google Patents.
US3674705A
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US
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Non-massing diaryl-p-phenylene diamines
Assignee: EIDP Inc
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Filing: 1969-07-30
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Granted: 1972-07-04
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Expires: 1989-07-30
Abstract
Abstract A non-massing antiozonant for chloroprene polymer rubbers prepared by mixing a finely divided inorganic material having a high surface area and a high oil absorption capacity with a diaryl-p-phenylene diamine composition. The diaryl-p-phenylene diamine is molten during the mixing operation. The antiozonant is highly resistant to caking and maintains its free-flowing particulate form during normal conditions of storage and use.
Inventors
- 👤 Frederick Paul Hytrek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:14
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
52 words
A process of claim 1 wherein the hydrous calcium silicate has a surface area of about 95-175 square meters per gram, an oil absorption capacity of about 220-490 square meters per gram and is used in the amount of about 5-15 parts by weight per 100 parts by weight of diaryl-p-phenylene diamine.
Claim 2
Dependent Claim
30 words
A process of claim 1 wherein the hydrous calcium silicate consists essentially of, in parts by weight, about 49-55 percent silicon dioxide, 22-28 percent calcium oxide and 13-19 percent water.
Claim 3
Dependent Claim
102 words
A process of claim 1 wherein the diaryl-p-phenylene diamine is prepared by condensing 1 mole of hydroquinone with about two moles of an amine mixture consisting essentially of about 78-82 percent by weight o-toluidine and 18-22 percent by weight of an amine mixture consisting essentially of dimethyl anilines or mixtures of dimethyl anilines and ethyl anilines, said anilines being present in any proportions with the proviso that at least about 65 percent by weight of said alkyl phenyl amine composition is at least one xylidine and the resulting solid diaryl-p-phenylene diamine is reduced to the desired particle size by crushing and grinding.
Claim 4
Dependent Claim
49 words
A process of claim 4 wherein the hydrous calcium silicate consists essentially of, in parts by weight, about 49-55 percent silicon dioxide, 22-28 percent calcium oxide, 13-19 percent water, and the remainder is iron oxide (Fe2O3), magnesium oxide (MgO), sodium oxide (Na2O) and potassium oxide (K2O) in varying proportions.
Claim 5
Dependent Claim
19 words
A non-massing antiozonant composition prepared by mixing a diaryl-p-phenylene diamine and hydrous calcium silicate as described in claim 1.
Claim 6
Dependent Claim
19 words
A non-massing antiozonant composition prepared by mixing a diaryl-p-phenylene diamine and hydrous calcium silicate as described in claim 2.
Claim 7
Dependent Claim
19 words
A non-massing antiozonant composition prepared by mixing a diaryl-p-phenylene diamine and hydrous calcium silicate as described in claim 3.
Claim 8
Dependent Claim
19 words
A non-massing antiozonant composition prepared by mixing a diaryl-p-phenylene diamine and hydrous calcium silicate as described in claim 4.
Claim 9
Dependent Claim
19 words
A non-massing antiozonant composition prepared by mixing a diaryl-p-phenylene diamine and hydrous calcium silicate as described in claim 5.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |