RUBBER COMPOSITION FOR VEHICLE COOLANT TRANSPORT HOSE, AND VEHICLE COOLANT TRANSPORT HOSE OBTAINED USING SAME

WIPO Patent Application WO/2023/106192

A1

Provided are a rubber composition for a vehicle coolant transport hose and a vehicle coolant transport hose obtained using the same that make it possible to solve various problems associated with increased coolant conductivity and clogging of filters of a vehicle coolant system, these problems having been observed in the past when a sulfur-vulcanized ethylene-propylene copolymer rubber composition was employed as a hose material.　A sulfur-vulcanized rubber composition that contains an ethylene-propylene copolymer rubber (A) as the main component and a vulcanization accelerator (B) and that serves as the material of the innermost layer of a vehicle coolant transport hose, wherein the vulcanization accelerator (B) includes at least one vulcanization accelerator selected from the group consisting of (B-1) to (B-3) below in a specific proportion. (B-1) A dithiocarbamate vulcanization accelerator having a molecular weight of 380 or greater. (B-2) A thiuram vulcanization accelerator having a molecular weight of 380 or greater. (B-3) A sulfenamide vulcanization accelerator.

HIRADO MOTOKI (JP)
TSUCHIYA TAISHI (JP)
HIRAI RYO (JP)
NODA MASASHI (JP)

PCT/JP2022/044345

June 15, 2023

December 01, 2022

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SUMITOMO RIKO CO LTD (JP)

C08L23/16; C08K3/06; C08K5/39; C08K5/40; C08K5/44; F16L11/04

WO2013038471A1

2013-03-21

JPH06256600A	1994-09-13
JP2003292697A	2003-10-15
JPH09176395A	1997-07-08
JPH04334446A	1992-11-20
CN111234388A	2020-06-05
CN102432950A	2012-05-02
JP2010164063A	2010-07-29

SAITOH Yukihiko et al. (JP)

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