Insulation layer for cables

Patent metadata

Field	Value
Publication number	US-10804005-B2
Application number	US-201214362997-A
Country	US
Kind code	B2
Filing date	Dec 5, 2012
Priority date	Dec 9, 2011
Publication date	Oct 13, 2020
Grant date	Oct 13, 2020

Abstract

The present invention is directed to a new cable having at least one insulation layer, to a process for producing such cable as well as to the use of a soluble a-nucleating agent (NA) for increasing the crystallization temperature of a polymer composition (PC) being part of an insulation layer of such a cable and the use of such a cable as communication cable and/or electrical cable.

First claim

The invention claimed is:

1. A cable having at least one insulation layer comprising a polymer composition (PC) consisting of:
(a) at least 94 wt. %, based on the total weight of the polymer composition (PC), of a crystalline polypropylene (PP) homo- or copolymer having a melt flow rate according to ISO 1133 (230° C./2.16 kg) in the range of 1 g/10 min to 10 g/10 min and a comonomer content of below 5 wt. %, the comonomers are ethylene and/or a C 4 to C 10 α-olefin,
(b) 0.5 wt. % to 3.5 wt. %, based on the total weight of the polymer composition (PC), of an adhesion promoter (AP) being a maleic anhydride modified polypropylene homo- or copolymer and/or an acrylic acid modified polypropylene homo- or copolymer, and
(c) 0.1 wt. % to 0.8 wt. %, based on the total weight of the polymer composition (PC), of a soluble α-nucleating agent (NA) selected from the group consisting of sorbitol derivatives, nonitol derivatives, benzene-trisamides and mixtures thereof;
wherein the polymer composition (PC) has a melting temperature Tm as determined by differential scanning calorimetry (DSC) in the range of 140° C. to 175° C. and a crystallization temperature Tc as determined by differential scanning calorimetry (DSC) in the range of 105° C. to 140° C.

2. The cable according to claim 1 , wherein the crystalline polypropylene (PP) homo- or copolymer has a melt flow rate according to ISO 1133 (230° C./2.16 kg) in the range of 1.0 g/10 min to 8.0 g/10 min.

3. The cable according to claim 1 , wherein the crystalline polypropylene (PP) homo- or copolymer has a melting temperature Tm as determined by differential scanning calorimetry (DSC) in the range of 140° C. to 175° C.

4. The cable according to claim 1 , wherein the crystalline polypropylene (PP) homo- or copolymer has a crystallization temperature Tc as determined by differential scanning calorimetry (DSC) in the range of 105° C. to 140° C.

5. The cable according to claim 1 , wherein the polymer composition (PC) has a Shore D hardness from 63 to 80.

6. The cable according claim 1 , wherein the polymer composition (PC) has a content of a fraction soluble in xylene at 25° C. from 0.5 wt. % to 8.5 wt. %, based on the total weight of the polymer composition (PC).

7. The cable according to claim 1 , wherein the polymer composition (PC) has a melt flow rate according to ISO 1133 (230° C./2.16 kg) in the range of 1.0 g/10 min and 8.0 g/10 min.

Assignees

• Borealis Ag

Inventors

• Klimke Katja
• Gloger Dietrich
• Gahleitner Markus
• Tranchida Davide
• Robinson James Ellis
• Watson Ann

Classifications

• C08L23/12 Primary

  Polypropene · CPC title

• C08K5/0083

  Nucleating agents promoting the crystallisation of the polymer matrix · CPC title

• C08L23/0869

  with unsaturated acids, e.g. [meth]acrylic acid; with unsaturated esters, e.g. [meth]acrylic acid esters · CPC title

• H01B3/441

  from alkenes · CPC title

• C08L23/142

  at least partially crystalline copolymers of propene with other olefins · CPC title