Extrudable blend

• US 4,705,823 A
• Filed: 11/07/1986
• Issued: 11/10/1987
• Est. Priority Date: 10/31/1984
• Status: Expired due to Term

• Current Assignee: Avaya Technology Corporation Miami Lakes FLA US
• Original Assignee: AT&T, Inc., AT&T Teleholdings Incorporated (AT&T, Inc.)
• Inventors: Choi, Jae H., Vesperman, William C., Kanotz, William M.
• Primary Examiner(s): Schofer, Joseph L.
• Assistant Examiner(s): Mulcahy, Peter D.
• Application Number:
  US06/928,083
• Time in Patent Office: 368 Days
• Field of Search: 525/95, 524/474
• US Class Current: 524/474
• CPC Class Codes: H01B 3/44 vinyl resins; acrylic resins silicones H01B3/46

Abstract

A telephone cord employs as an insulator for the conductors therein an extrudable blend of a styrene-ethylenebutylene-styrene copolymer with polypropylene.

Claims

1. An extrudable composition of matter comprising a polymer blend consisting essentially of a styrene-ethylenebutylene-styrene copolymer with a mixture of low melt index and high melt index polypropylenes wherein the chainlength of the styrene portion of the copolymer exceeds the chainlength of the ethylenebutylene portion and wherein the copolymer comprises >

10 to <

20 weight parts of the blend, the low melt index polypropylene comprises >

10 to <

20 weight parts of the blend and the high melt index polypropylene comprises from >

50 to <

80 weight parts of the blend.

2. The extrudable composition of matter recited in claim 1, wherein the melt indices of the polypropylene are 1 and 12.

3. The extrudable composition of matter recited in claim 1, including color concentrate, peroxide decomposer, stabilizer and antioxidant.

4. An extrudable composition of matter having an insulating jacket thereover, said composition comprising a polymer blend consisting essentially of from 10 to 20 weight parts of a styrene-ethylenebutylene-styrene copolymer wherein the length of the styrene chains exceeds the length of the ethylenebutylene chain, >

10 to <

20 weight parts of a low melt index polypropylene and >

50 to <

80 weight parts of a high melt index polypropylene.

5. The extrudable composition of matter recited in claim 4, wherein the melt indices of the polypropylene are 1 and 12.

6. The extrudable composition of matter recited in claim 4, wherein the polymer blend consists essentially of:

11 to 14 weight parts of the copolymer;

12 to 16 weight parts melt index 1 polypropylene; and

65 to 75 weight parts melt index 12 polypropylene.

7. The extrudable composition of matter recited in claim 6, including:

2.5 to 4.5 weight parts polyethylene color concentrate;

0.1 to 0.15 weight parts epoxy resin;

0.01 to 0.06 weight parts antioxidant;

0.05 to 0.15 weight parts peroxide decomposer;

0.01 to 0.1 weight parts copper type inhibitor; and

0.3 to 0.5 weight parts naphthenic oil.