Patent US4391941A successfully refreshed from Google Patents.
US4391941A
Expired / Lapsed
US
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Stabilized polypropylene compositions
Assignee: Cabot Corp
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Filing: 1981-09-18
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Granted: 1983-07-05
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Expires: 2001-09-18
Abstract
Abstract This disclosure relates to the use of certain heat-treated carbon blacks as stabilizers against the effects of degradation caused by visible and ultraviolet light in the preparation of polypropylene resin compositions containing conventional antioxidants which impart thermal stability to the polypropylene resin.
Inventors
- 👤 George R. Cotten
- 👤 Avrom I. Medalia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:56
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
A composition of matter having improved resistance to the harmful effects of visible and ultraviolet light comprising a thermally stabilized polypropylene and as a light stabilizer for the composition a furnace carbon black which has been heat treated at a temperature of from about 1200° to about 3000° C. under a non-oxidizing atmosphere, said light stabilizer being present in amounts of from about 0.1 to about 2.0 percent by weight based on the weight of the thermally stabilized polypropylene.
Claim 2
Dependent Claim
79 words
A composition of matter having improved resistance to the harmful effects of visible and ultraviolet light comprising a thermally stabilized polypropylene and as a light stabilizer for the composition a furnace carbon black which has been heat treated at a temperature of from about 1200° to about 3000° C. under a non-oxidizing atmosphere, said light stabilizer being present in amounts of from about 0.1 to about 2.0 percent by weight based on the weight of the thermally stabilized polypropylene.
Claim 3
Dependent Claim
34 words
The composition as defined in claim 1 wherein said light stabilizer is present in amounts of from about 0.25 to about 1.0 percent by weight based on the weight of the thermally stabilized polypropylene.
Claim 4
Dependent Claim
23 words
The composition as defined in claim 1 wherein said furnace carbon black has been heat treated at a temperature of about 1200° C.
Claim 5
Dependent Claim
23 words
The composition as defined in claim 1 wherein said furnace carbon black has been heat treated at a temperature of about 1350° C.
Claim 6
Dependent Claim
23 words
The composition as defined in claim 1 wherein said furnace carbon black has been heat treated at a temperature of about 1500° C.
Claim 7
Dependent Claim
23 words
The composition as defined in claim 1 wherein said furnace carbon black has been heat treated at a temperature of about 2700° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |