Insulated electric wire

Details Insulated electric wire Insulated electric wire

H - Electricity

01

B

H01B 3/30 (2006.01) C09D 7/12 (2006.01) C09D 123/12 (2006.01) C09D 123/16 (2006.01) H01B 3/44 (2006.01) H01B 7/02 (2006.01) C08K 3/22 (2006.01)

Patent

CA 2443887

An insulated electric wire, wherein a conductor is coated with a resin composition comprising the following components (A), (B) and (C) and wherein a modulus of elasticity in flexure of the resin composition is not more than 2, 000 Mpa, has good insulating property, water resistance and oil resistance of polyolefin and, still, bending property, anti-scrape property, resistance against deformation by heating and resistance against whitening by bending thereof are improved and, further, its productivity is good: (A) 100 parts by weight of a mixture of a microblend and a modified microblend, wherein the microblend comprises 1 to 70% by weight of polypropylene and 99 to 30% by weight of a propylene-ethylene random copolymer, and wherein the total eluted components fractionated by a temperature-rising elution fractionation method using o-dichlorobenzene as a solvent comprises (a) 20 to 80% by weight of a component eluted at -40°C or higher but lower than +20°C, (b) 10 to 70% by weight of a component eluted at +20°C or higher but lower than +100°C and (c) 1 to 40% by weight of a component eluted at +100°C or higher, wherein the sum of the component (a), the component (b) and the component (c) is 100% by weight, wherein the modified microblend is prepared by bonding an organic acid group to the microblend, wherein concentration of the organic acid group in the mixture is 0.01 to 1 mmol per 1 g of the total microblend, and the total microblend contains 10 to 90% by weight of a component eluted at -40°C to +30°C in the total eluted components fractionated by the temperature-rising elution fractionation method using o-dibromobenzene as a solvent; (B) not more than 700 parts by weight of polypropylene; and (C) 5 to 200 parts by weight of an ion cross-linking filler based on 100 parts by weight of the total amount of the component (A) and the component (B).

L'invention concerne un fil électrique isolé, qui comprend un fil électroconducteur recouvert d'une composition de résine présentant un module de courbure d'au plus 2000 Mpa et contenant les constituants (A), (B) et (C): (A) 100 parties en poids d'une association de micro-mélange comprenant 1 à 70 % en poids d'un polypropylène et 99 à 30 % en poids d'un copolymère statistique de propylène-éthylène avec un micro-mélange modifié préparé par liaison d'un groupe acide organique au micro-mélange; (B) 700 parties en poids d'un polypropylène; (C) 5 à 200 parties en poids, relativement à 100 parties en poids de la somme de (A) et (B), d'une charge pouvant former une réticulation ionique. Le fil électrique isolé de l'invention présente une bonne isolation, résiste à l'eau et à l'huile, et possède des propriétés de flexion améliorées, ainsi que de résistance au grattage, à la déformation thermique et au blanchissement au pliage. Il peut être produit avec un bon rendement.

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