Filling material for electric cable

• US 4,509,821 A
• Filed: 09/01/1983
• Issued: 04/09/1985
• Est. Priority Date: 09/10/1981
• Status: Expired due to Fees

• Current Assignee: Sun Refining and Marketing Company
• Original Assignee: Sun Tech, Inc.
• Inventors: Stenger, Richard J.
• Primary Examiner(s): BARR, JOSEPHINE
• Application Number:
  US06/528,489
• Time in Patent Office: 586 Days
• Field of Search: 350/96.23, 524/476, 524/487, 524/489, 174/23 C
• US Class Current: 385/101
• CPC Class Codes: G02B 6/4401 Optical cables glass fibres with a protective coating G02B6/02395
• CPC Class Codes: G02B 6/44384 the means comprising water blocking or hydrophobic materials G02B6/4439, G02B6/4479 take precedence
• CPC Class Codes: H01B 7/285 by completely or partially filling interstices in the cable

Abstract

A cable fill composition comprising a paraffinic oil, a styrene-ethylene butylene-styrene block copolymer, and a linear polyethylene wax having an average molecular weight in the range of from about 1000 to 1500, whereby an improved drip point of the composition is obtained.

Claims

1. A cable comprising:

a plurality of conductors contained within a sheath leaving voids between the conductors, and between the conductors and the sheath, and a filling material filling the voids the invention characterized in that the filling material comprises a mixture of;

(X) ASTM Type 103, 104A or 104B, or mixtures thereof, (paraffinic or naphthenic) oil having a minimum sp. gr. of 0.860, a minimum SUS viscosity at 210 degrees F. of 45, a maximum pour point ASTM D 97 of 20 degrees F. and a maximum of 5 percent aromatic oils,

(Y) a styrene-ethylene butylene-styrene block copolymer having a styrene-rubber ratio of approximately 0.2 to 0.5, and

(Z) a linear polyethylene wax having an average molecular weight in the range of from about 1000 to 1500, the ingredients X, Y and Z having relative proportions falling within the shaded area bounded by ABCDEF of the FIGURE.

2. The cable of claim 1 in which the conductors are electrical conductors.

3. The cable of claim 1 in which the conductors are light conductors.

4. A cable fill composition comprising

(X) ASTM Type 103, 104A, or 104B, or mixtures thereof (paraffinic or naphthenic) oil having a minimum sp. gr. of 0.860, a minimum SUS viscosity at 210 degrees F. of 45, a maximum pour point ASTM D 97 of 20 degrees F. and a maximum of 5 percent aromatic oils,

(Y) a styrene-ethylene butylene-styrene block copolymer having a styrene-rubber ratio of approximately 0.2 to 0.5, and

(Z) a linear polyethylene wax having an average molecular weight in the range of from about 1000 to 1500, the ingredients X, Y and Z having relative proportions falling within the shaded area bounded by ABCDEF of the FIGURE.

5. The composition of claim 4 wherein the amount of (X) is from about 85% to about 90%, the amount of (Y) is from about 5% to about 8% and the amount of (Z) is from about 4% to about 6%.

6. The composition of claim 4 wherein the amount of (X) is about 89%, the amount of (Y) is about 6% and the amount of (Z) is about 5%.

7. The composition of claim 4 wherein component (X) has a pour point ASTM 97 of zero degrees F.;

SUS viscosity at 210°

F. of S-3.7;

sp. gr. (ave.) of 0.884; and

maximum aromatic oils of 1%.

8. The compositions of claim 4, 5, 6, or 7 wherein the styrene-rubber ratio is approximately 0.4.