Additive for communication cable filler and filler for...

Details Additive for communication cable filler and filler for... Additive for communication cable filler and filler for...

2005-01-11

2005-01-11

Wu, David W. (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S348200, C526S348400, C526S348500, C526S348600, C526S351000, C525S240000

Reexamination Certificate

active

06841643

ABSTRACT:
The additive (b) for a communication cable filler according to the present invention contains as a main component an ethylene/α-olefin copolymer (a) having a number-average molecular weight (Mn), measured by GPC, of 500 to 5,000 and having a crystallizing temperature (Tc (° C.), rate of temperature decrease: 2° C./min) measured by DSC and a density (D (kg/m3)) measured by a density gradient tube method, said Tc and D satisfy the following formula (1):in-line-formulae description="In-line Formulae" end="lead"?0.501×D(kg/m3)−366≧Tc(° C.)  (1).in-line-formulae description="In-line Formulae" end="tail"?The communication cable filler (c) according to the invention is prepared by blending (X) 40 to 90% by mass of polybutene (d) having a number-average molecular weight of 200 to 2,400, (Y) 1 to 50% by mass of an oil (e) and (Z) 1 to 15% by mass of the ethylene/α-olefin copolymer (a). The additive for a communication cable filler and the communication cable filler are excellent in the filling workability and the oil retention properties of a cable jelly.

REFERENCES:
patent: 6127441 (2000-10-01), Sakamoto et al.
patent: 6335410 (2002-01-01), Finalyson et al.
patent: 416815 (1991-03-01), None
patent: 58-174429 (1983-10-01), None

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