Heat resistant ethylene-propylene rubber with improved tensile properties and insulated conductor product thereof

• US 4,303,574 A
• Filed: 11/20/1980
• Issued: 12/01/1981
• Est. Priority Date: 06/19/1979
• Status: Expired due to Term

• Current Assignee: Vulkor, Inc. (Therm-O-Link, Inc.)
• Original Assignee: General Electric Company
• Inventors: Vostovich, Joseph E.
• Primary Examiner(s): Marquis, Melvyn I.
• Application Number:
  US06/208,725
• Time in Patent Office: 376 Days
• Field of Search: 260/42.15, 260/42.33, 260/42.41, 260/42.45, 260/33.6 QA, 428/389, 428/390, 428/391
• US Class Current: 524/264
• CPC Class Codes: C08K 3/04 Carbon
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08K 3/34 Silicon-containing compounds
• CPC Class Codes: C08K 5/14 Peroxides
• CPC Class Codes: C08K 5/17 Amines; Quaternary ammonium compounds
• CPC Class Codes: C08K 5/3412 having one nitrogen atom in the ring
• CPC Class Codes: C08K 5/54 Silicon-containing compounds C08K5/0091 takes precedence
• CPC Class Codes: C08K 5/5425 containing at least one C=C bond
• CPC Class Codes: C08K 5/59 Arsenic- or antimony-containing compounds
• CPC Class Codes: C08L 2205/025 containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
• CPC Class Codes: C08L 2205/035 containing four or more polymers in a blend
• CPC Class Codes: C08L 23/16 Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
• CPC Class Codes: C08L 23/34 by chlorosulfonation
• CPC Class Codes: C08L 2312/00 Crosslinking
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 61/00 Compositions of condensation polymers of aldehydes or ketones with polyalcohols C08L59/00; with polynitriles C08L77/00; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 9/00 Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
• CPC Class Codes: H01B 3/441 from alkenes
• CPC Class Codes: H01B 7/292 using material resistant to heat
• CPC Class Codes: Y10T 428/2958 Metal or metal compound in coating
• CPC Class Codes: Y10T 428/296 : Rubber, cellulosic or silicic material in coating
• CPC Class Codes: Y10T 428/2962 : Silane, silicone or siloxane in coating

Abstract

A cross-link curable ethylene-propylene rubber composition with improved tensile and related properties and resistance to heat, the cured rubber composition and electrical conductors indulated with said cured rubber composition. The improved rubber composition comprises a combination of ethylene-propylene rubber, chlorosulfonated polyethylene, finyl silane, antimony oxide, peroxide and a combination of antioxidants, zinc oxide, talc and carbon black in particular proportions.

Claims

1. A curable ethylene-propylene rubber composition having improved tensile and related physical properties, resistance to heat and apt electrical and physical properties, consisting essentially of the combination in approximate parts by weight of:

Ethylene-propylene rubber 100

Talc-hydrated magnesium silicate 50-125

Vinyl silane 0.5-3

Thermal carbon black 10-32

Reaction product of acetone and diphenylamine 1-2.5

Zinc salt of 2-mercaptotolylimidazole 0.2-3

Chlorosulfonated polyethylene 3-10

Antimony trioxide 3-10

Zinc oxide 15-25

Dicumyl peroxide curing agent 2-8

Polybutadiene homopolymer 2-5

2. The cured composition of claim 1.

3. A cable coated with the cured composition of claim 1.

4. A curable ethylene-propylene rubber composition having improved tensile and related physical properties, resistance to heat and apt electrical and physical properties, consisting essentially of the combination in approximate parts by weight of:

Ethylene-propylene copolymer 50.

Ethylene-propylene-diene-terpolymer 50.

Talc-hydrated magnesium silicate 76.

Vinyl silane 0.77

Medium thermal carbon black 30.4

Reaction product of acetone and diphenylamine 2.

Zinc salt of 2-mercaptotolylimidazole 0.5

Chlorosulfonated polyethylene 5.

Antimony trioxide 5.

Zinc oxide 20.8

Dicumyl peroxide curing agent 98-100% active 4.71

Polybutadiene homopolymer 3.

5. The cured product of claim 4.

6. A cable coated with the cured product of claim 5.