Cold-resistant chloroprene sheath mixture

摘要

#CMT# #/CMT# Crosslinkable polymer mixture comprises 100 parts per hundred (phr) of chloroprene or a blend of chloroprene and a further polymer, which is an unsaturated rubber, 3-7 phr of a stabilizer, 3-7 phr of an antiaging agent, 0-7 phr of a dye, a crosslinking system, 5.2-12.2 phr of an adhesive, 8-15 phr of a processing aid, 40-55 phr of a mineral filler and 5-10 phr of a plasticizer. #CMT# : #/CMT# Independent claims are included for: (1) an electrical and/or optical cable or wire, comprising an outer sheath containing the polymer mixture; and (2) producing a wire or a cable comprising extruding the above component to obtain the polymer mixture and crosslinking the polymer mixture. #CMT#USE : #/CMT# The polymer mixture is useful as a coating of an electrical and/or optical cable or a wire (claimed). #CMT#ADVANTAGE : #/CMT# The polymer mixture: exhibits good cold, oil, UV and ozone resistance, high thermal stability and tear strength and good processability; and provides cables with bright color. #CMT#INORGANIC CHEMISTRY : #/CMT# Preferred Components: The mineral filler is calcined or fumed silica and exhibits a specific surface area of at least 170 m 2>/g. The plasticizer is a mixture of many plasticizers with a pour point of less than -60[deg] C. The stabilizer is magnesium oxide. The crosslinking system comprises a retarder, a vulcanization accelerator, a crosslinking agent and an activator. #CMT#ORGANIC CHEMISTRY : #/CMT# Preferred Components: The adhesive agent is triethanolamine and/or sulfur silane. The antiaging agent is pentaerythritol-bis(tetrahydrobenzaldehyde acetal), a diphenyl compound and/or a bisphenol compound. The processing aid is a mixture of ozone protection wax, paraffin, stearic acid and/or silicone oil. #CMT#POLYMERS : #/CMT# Preferred Method: In the process for producing a wire or a cable, the crosslinking step takes place by heating. Preferred Components: The polymer mixture after crosslinking exhibits a cold stretch of at least 30% at 50[deg] C, according to EN 60811-1-4. #CMT#EXAMPLE : #/CMT# Typical polymer mixture comprised of (in phr): chloroprene (100); magnesium oxide (4); antiaging agent e.g. pentaerythritol-bis(tetrahydrobenzaldehyde acetal) (5.5); soot (2); crosslinking system from 1.2 phr of dibenzothiazyldisulfide, 1.25 phr of N,N'-ethylene thiourea, 1.7 phr of 70% methylmercaptobenzimidazole in elastomer binder/dispersant and 5 phr of zinc oxide (8.15); adhesive agent e.g. triethanolamine (10.2); processing aids such as ozone protective wax, paraffin or stearic acid (12.5); silica (47); and dioctyl adipate (6).