Patent US3900533A successfully refreshed from Google Patents.
US3900533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant polyethylene composition and coating process
Assignee: Millennium Petrochemicals Inc
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Filing: 1973-03-05
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Granted: 1975-08-19
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Expires: 1993-03-05
Abstract
Abstract A flame retardant composition formed by blending both low density polyethylene and high density polyethylene with a plurality of fire retardant additives comprising 1,2,3,4,6,7,8,9,10,10,11,11-dodecachloro-1,4,4a,5a,6,9,9a,9boctahydro -1,4,6,9,-dimethanodibenzofuran and 5(tetrabromophenyl)-1,2,3,4,7,7,-hexachloronorbornene. The composition may contain antimony compounds as well as other conventional additives. By employing such compositions as insulation coatings for high voltage electrical wire or cable outstanding improvements are achieved in meeting stringent flammability and high voltage cut-through specifications.
Inventors
- 👤 Joseph J Krackeler
- 👤 William G Biddell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:00
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/29; H01B7/295; C; C08; C08K; C08K5/00; C08K5/02; C08K5/03; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
100 words
A FLAME RETARDANT POLYMERIC COMPOSITION FOR INSULATING COATING OF HIGH VOLTAGE ELECTRICAL OR CABLE COMPRISING THE FOLLOWING INGREDIENTS: A. ABOUT 45 TO 85% OF POLYMERIC COMPONENTS COMPRISING ABOUT 15 TO 60% HIGH DINSITY POLYTHLENE AND ABOUT 40 TO 85% LOW DENSITY POLYETHYLENE, B. FIRE RETARDENT COMPONENTS COMPRISING ABOUT 2 TO 20% BY WEIGHT, 1,2,3,4,5,6,7,8,9,10,11,11-DODECAHLORO1, 4, 4A, 5A, 6, 9, 9A, 9B-OCTAHYDRO-1, 4, 6, 9-DIMETHANODIBENZOFURAN AND ABOUT 2 TO 30% BY WEIGHT 5-(TETROBROMOPHENYL)-1, 2, 3, 4, 7, 7-HEXACHLORONORBORNENE IN A PARTS BY WEIGHT RATIO OF 1/1 TO 1/1.86, RESPECTIVELY, AND C. ABOUT 10 TO 40% BY WEIGHT OF AN ANTIMONY COMPOUND.
Claim 2
Dependent Claim
100 words
A FLAME RETARDANT POLYMERIC COMPOSITION FOR INSULATING COATING OF HIGH VOLTAGE ELECTRICAL OR CABLE COMPRISING THE FOLLOWING INGREDIENTS: A. ABOUT 45 TO 85% OF POLYMERIC COMPONENTS COMPRISING ABOUT 15 TO 60% HIGH DINSITY POLYTHLENE AND ABOUT 40 TO 85% LOW DENSITY POLYETHYLENE, B. FIRE RETARDENT COMPONENTS COMPRISING ABOUT 2 TO 20% BY WEIGHT, 1,2,3,4,5,6,7,8,9,10,11,11-DODECAHLORO1, 4, 4A, 5A, 6, 9, 9A, 9B-OCTAHYDRO-1, 4, 6, 9-DIMETHANODIBENZOFURAN AND ABOUT 2 TO 30% BY WEIGHT 5-(TETROBROMOPHENYL)-1, 2, 3, 4, 7, 7-HEXACHLORONORBORNENE IN A PARTS BY WEIGHT RATIO OF 1/1 TO 1/1.86, RESPECTIVELY, AND C. ABOUT 10 TO 40% BY WEIGHT OF AN ANTIMONY COMPOUND.
Claim 3
Dependent Claim
15 words
The flame retardant polymeric composition of claim 1 wherein said antimony compound is antimony trioxide.
Claim 4
Dependent Claim
143 words
A process for the preparation of a flame retardant polymeric composition for insulating coating of high voltage electrical wire or cable which comprises blending the following ingredients: a. about 45 to 85% of polymeric components comprising about 15 to 60% high density polyethylene and about 40 to 85% low density polyethylene; b. fire retardant components comprising about 2 to 20% by weight 1, 2, 3, 4, 6, 7, 8, 9, 10, 10, 11, 11-dodecachloro-1, 4, 4a, 5a, 6, 9, 9a, 9b-octahydro-1, 4, 6, 9,-dimethanodibenzofuran and about 2 to 30% by weight 5-(tetrabromophenyl)-1, 2, 3, 4, 7, 7,-hexachloronorbornene in a parts by weight ratio of 1/1 to 1/1.86, respectively; and c. about 10 to 40% by weight of an antimony compound; and then heating the resulting composition to a temperature at least above the melting point of the 5-(tetrabromophenyl)-1, 2, 3, 4, 7, 7-hexachloro-norbornene.
Claim 5
Dependent Claim
143 words
A process for the preparation of a flame retardant polymeric composition for insulating coating of high voltage electrical wire or cable which comprises blending the following ingredients: a. about 45 to 85% of polymeric components comprising about 15 to 60% high density polyethylene and about 40 to 85% low density polyethylene; b. fire retardant components comprising about 2 to 20% by weight 1, 2, 3, 4, 6, 7, 8, 9, 10, 10, 11, 11-dodecachloro-1, 4, 4a, 5a, 6, 9, 9a, 9b-octahydro-1, 4, 6, 9,-dimethanodibenzofuran and about 2 to 30% by weight 5-(tetrabromophenyl)-1, 2, 3, 4, 7, 7,-hexachloronorbornene in a parts by weight ratio of 1/1 to 1/1.86, respectively; and c. about 10 to 40% by weight of an antimony compound; and then heating the resulting composition to a temperature at least above the melting point of the 5-(tetrabromophenyl)-1, 2, 3, 4, 7, 7-hexachloro-norbornene.
Claim 6
Dependent Claim
22 words
The process of claim 3 wherein the resulting composition is heated to a temperature within the range of about 360* to 400*F.
Claim 7
Dependent Claim
20 words
The process of claim 3 wherein said heating step is carried out during pelletization of the flame retardant polymeric composition.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |