SEMICONDUCTOR POLYMER COMPOSITIONS COMPRISING A GRAFTED BLOCK COPOLYMER OF SYNTHETIC RUBBER AND POLYOLEFIN AND CARBON BLACK

• US 3,862,056 A
• Filed: 12/20/1972
• Issued: 01/21/1975
• Est. Priority Date: 12/15/1967
• Status: Expired due to Term

• Current Assignee: Paxon Polymer Company LP Baton Rouge La A de Limited Partnership
• Original Assignee: Paul F. Hartman
• Inventors: Hartman, Paul F.
• Primary Examiner(s): Behrend, Harvey E.
• Assistant Examiner(s): Schafer, R. E.
• Application Number:
  US05/317,020
• Time in Patent Office: 762 Days
• Field of Search: 252/510,511 260/41,41.5,878B
• US Class Current: 252/511
• CPC Class Codes: C08K 3/04 Carbon
• CPC Class Codes: C08K 3/08 Metals
• CPC Class Codes: C08L 21/00 Compositions of unspecified rubbers
• CPC Class Codes: C08L 23/02 not modified by chemical after-treatment
• CPC Class Codes: C08L 23/06 Polyethene
• CPC Class Codes: C08L 23/22 Copolymers of isobutene; Butyl rubber ; Homo- or copolymers of other iso-olefins
• CPC Class Codes: C08L 2312/04 with phenolic resin
• 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 2666/06 Homopolymers or copolymers of unsaturated hydrocarbons; Derivatives thereof
• CPC Class Codes: C08L 53/00 Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 61/06 of aldehydes with phenols
• CPC Class Codes: H01B 1/00 Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
• CPC Class Codes: H01B 1/22 the conductive material comprising metals or alloys
• CPC Class Codes: H01B 1/24 the conductive material comprising carbon-silicon compounds, carbon or silicon

Abstract

Semiconductive polymer compositions, useful as electrostatic shielding, comprise an electrically conductive filler, such as carbon black, in a polymer matrix comprising a polyolefin and a synthetic rubber.

Claims

2. The composition of claim 1 wherein the synthetic rubber is selected from the group consisting of neoprene, polyisoprene, polyisobutylene, polybutadiene, butyl rubber, copolymers of butadiene and styrene containing 50 to 95% butadiene, and ethylene-propylene terpolymers.

3. The composition of claim 2 wherein the synthetic rubber is grafted to the polyolefin through a bifunctional phenolic material wherein the functional groups are hydroxy or halogen substituents in ortho positions.

4. The composition of claim 3 wherein the synthetic rubber is butyl rubber.

5. The composition of claim 3 wherein the polyolefin is polyethylene.

6. The composition of claim 5 wherein the synthetic rubber is butyl rubber.

7. The composition of claim 6 wherein the butyl rubber is present in the copolymer in an amount of from 20 to 60 percent by weight.

8. The composition of claim 7 wherein the carbon black is present in an amount of from about 20 to 26% by weight based on the total weight of the carbon black and the polymer matrix.

9. An electric power cable jacketed with the composition of claim 1.