US4459380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat resisting ethylene-propylene rubber and insulated conductor product thereof
Assignee: Vulkor Inc
•
Filing: 1981-08-03
•
Granted: 1984-07-10
•
Expires: 2001-08-03
Abstract
Abstract A crosslink curable ethylene-propylene rubber composition with improved resistance to heat shock, the cured rubber composition and electrical conductors insulated with said cured rubber composition. The improved rubber composition comprises a combination of ethylene-propylene rubbers of different structural orientation, and antioxidants.
Inventors
- 👤 Joseph E. Vostovich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:13
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/29; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
57 words
A curable ethylene-propylene rubber composition having improved resistance to heat shock and apt electrical and physical properties, comprising the combination in approximate parts by weight of: ______________________________________
Ethylene-propylene rubber,
80
semi-crystalline
Ethylene-propylene rubber,
10-40
amorphous
Hydrated alumina filler
50-150
Zinc oxide 10-30
Paraffin 0-15
Polychloroprene 0-15
Antioxidant 2-8
Vinyl silane 0-5
Peroxide crosslink curing agent
2-8
______________________________________
Claim 2
Dependent Claim
57 words
A curable ethylene-propylene rubber composition having improved resistance to heat shock and apt electrical and physical properties, comprising the combination in approximate parts by weight of: ______________________________________
Ethylene-propylene rubber,
80
semi-crystalline
Ethylene-propylene rubber,
10-40
amorphous
Hydrated alumina filler
50-150
Zinc oxide 10-30
Paraffin 0-15
Polychloroprene 0-15
Antioxidant 2-8
Vinyl silane 0-5
Peroxide crosslink curing agent
2-8
______________________________________
Claim 3
Dependent Claim
12 words
The crosslink cured product of the ethylene-propylene rubber composition of claim 1.
Claim 4
Dependent Claim
73 words
A curable ethylene-propylene rubber composition having improved resistance to heat shock and apt electrical and physical properties, comprising the combination in approximate parts by weight of: ______________________________________
Ethylene-propylene rubber, semi-crystalline
80
Ethylene-propylene rubber, amorphous
10-40
Hydrated alumina filler 50-150
Zinc oxide 10-30
Paraffin 0-15
Polychloroprene 0-15
Antioxidants - combination of a sterically
2-8
hindered di-tertiary butyl phenol with a
zinc salt of a mercaptoimidazole
Vinyl silane 0-5
Peroxide crosslink curing agent
2-8
______________________________________
Claim 5
Dependent Claim
73 words
A curable ethylene-propylene rubber composition having improved resistance to heat shock and apt electrical and physical properties, comprising the combination in approximate parts by weight of: ______________________________________
Ethylene-propylene rubber, semi-crystalline
80
Ethylene-propylene rubber, amorphous
10-40
Hydrated alumina filler 50-150
Zinc oxide 10-30
Paraffin 0-15
Polychloroprene 0-15
Antioxidants - combination of a sterically
2-8
hindered di-tertiary butyl phenol with a
zinc salt of a mercaptoimidazole
Vinyl silane 0-5
Peroxide crosslink curing agent
2-8
______________________________________
Claim 6
Dependent Claim
12 words
The crosslink cured product of the ethylene-propylene rubber composition of claim 3.
Claim 7
Dependent Claim
87 words
A curable ethylene-propylene rubber composition having improved resistance to heat shock and apt electrical and physical properties, comprising the combination in approximate parts by weight of: ______________________________________
Ethylene-propylene rubber, at least about
80
8 percent crystalline
Ethylene-propylene rubber, substantially
10- 50
amorphous
Hydrated alumina filler 50- 150
Zinc oxide 10- 30
Paraffin 0- 15
Polychloroprene 3- 15
Antioxidants - combination of a sterically
2- 8
hindered di-tertiary butyl phenol with a
zinc salt of a mercaptoimidazole
Vinyl silane 0.5- 5
Peroxide crosslink curing agent
2- 8
______________________________________
Claim 8
Dependent Claim
87 words
A curable ethylene-propylene rubber composition having improved resistance to heat shock and apt electrical and physical properties, comprising the combination in approximate parts by weight of: ______________________________________
Ethylene-propylene rubber, at least about
80
8 percent crystalline
Ethylene-propylene rubber, substantially
10- 50
amorphous
Hydrated alumina filler 50- 150
Zinc oxide 10- 30
Paraffin 0- 15
Polychloroprene 3- 15
Antioxidants - combination of a sterically
2- 8
hindered di-tertiary butyl phenol with a
zinc salt of a mercaptoimidazole
Vinyl silane 0.5- 5
Peroxide crosslink curing agent
2- 8
______________________________________
Claim 9
Dependent Claim
12 words
The crosslink cured product of the ethylene-propylene rubber composition of claim 5.
Claim 10
Dependent Claim
96 words
A curable ethylene-propylene rubber composition having improved resistance to heat shock and apt electrical and physical properties, comprising the combination in approximate parts by weight of: ______________________________________
Ethylene-propylene rubber, approximately
80
8 to 40 percent crystalline
Ethylene-propylene rubber, substantially
10- 40
amorphous
Hydrated alumina filler 50- 150
Zinc oxide 10- 30
Paraffin 0- 15
Polychloroprene 3- 15
Antioxidant - combination of a sterically
2- 8
hindered di-tertiary butyl phenol with a
zinc salt of a mercaptoimidazole in an
approximate weight ratio of 1 to 2
Vinyl silane 0.5- 5
Peroxide crosslink curing agent
2- 8
______________________________________
Claim 11
Dependent Claim
96 words
A curable ethylene-propylene rubber composition having improved resistance to heat shock and apt electrical and physical properties, comprising the combination in approximate parts by weight of: ______________________________________
Ethylene-propylene rubber, approximately
80
8 to 40 percent crystalline
Ethylene-propylene rubber, substantially
10- 40
amorphous
Hydrated alumina filler 50- 150
Zinc oxide 10- 30
Paraffin 0- 15
Polychloroprene 3- 15
Antioxidant - combination of a sterically
2- 8
hindered di-tertiary butyl phenol with a
zinc salt of a mercaptoimidazole in an
approximate weight ratio of 1 to 2
Vinyl silane 0.5- 5
Peroxide crosslink curing agent
2- 8
______________________________________
Claim 12
Dependent Claim
12 words
The crosslink cured product of the ethylene-propylene rubber composition of claim 7.
Claim 13
Dependent Claim
89 words
A curable ethylene-propylene rubber composition having improved resistance to heat shock and apt electrical and physical properties, comprising the combination in approximate parts by weight of: ______________________________________
Ethylene-propylene rubber, approximately
80
8 to 30 percent crystalline
Ethylene-propylene rubber,
20
substantially amorphous
Hydrated alumina filler 100
Zinc oxide 15
Paraffin 5
Polychloroprene 8
Antioxidants - combination of a sterically
6
hindered di-tertiray butyl phenol with a
zinc salt of a mercaptoimidazole in an
approximate weight ratio of 1 to 2
Vinyl silane 1.5
Di-cumyl peroxide crosslink curing agent
3
______________________________________
Claim 14
Dependent Claim
89 words
A curable ethylene-propylene rubber composition having improved resistance to heat shock and apt electrical and physical properties, comprising the combination in approximate parts by weight of: ______________________________________
Ethylene-propylene rubber, approximately
80
8 to 30 percent crystalline
Ethylene-propylene rubber,
20
substantially amorphous
Hydrated alumina filler 100
Zinc oxide 15
Paraffin 5
Polychloroprene 8
Antioxidants - combination of a sterically
6
hindered di-tertiray butyl phenol with a
zinc salt of a mercaptoimidazole in an
approximate weight ratio of 1 to 2
Vinyl silane 1.5
Di-cumyl peroxide crosslink curing agent
3
______________________________________
Claim 15
Dependent Claim
12 words
The crosslink cured product of the ethylene-propylene rubber composition of claim 9.
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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) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |