Patent ID: 8481155
Filing Date: 2013-07-09
Classification: C08J,C09J,Y10T

Abstract:
1. An EPDM foam obtained by foaming a foam composition containing, based on 100 parts by weight of an ethylenepropylenediene rubber, 0.1 to 5 parts by weight of a vulcanizer, 0.1 to 10 parts by weight of a vulcanization accelerator, 1 to 30 parts by weight of a foaming agent, and a foaming auxiliary agent, wherein the vulcanization accelerator in the form of a four-component composition contains a thiourea vulcanization accelerator, a thiazole vulcanization accelerator, a dithiocarbamate vulcanization accelerator, and a thiuram vulcanization accelerator such that a thiourea vulcanization accelerator/thiazole vulcanization accelerator/dithiocarbamate vulcanization accelerator/thiuram vulcanization accelerator weight ratio is in a range of 1 1 to 20/1 to 20/1 to 20/1 to 30: wherein the thiourea vulcanization accelerator is at least one selected from the group consisting of N,N′-diethylthiourea, N,N′-dibutylthiourea, N,N′-diphenylthiourea, and trimethylthiourea, and wherein the EPDM foam has a semi-open/semi-closed structure.