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Liquid rubber (LIR), a crosslinkable plasticiser
von Mizuho Maeda, Ralph Böhm
Kuraray liquid rubbers (LIR) are low molecular weight polydienes which consist of isoprene, butadiene, and styrene. The molecular weight of LIR is designed to have plasticising effect and vulcanisability with solid rubbers. Therefore we call our liquid rubbers “reactive plasticiser” or “co-curable plasticiser”.
There are three types of LIR that is homo polymer type (standard grade), copolymer type, and modified type. LIR can be used for a wide range of applications, rubber goods (tyre, belt), adhesives (solution, hotmelt, latex, UV cure), sealants for automotive or construction and others (printing plate, coating). Modified types of LIR have additional function besides plasticising effect and vulcanisability. LIR-403 and 410, which are carboxylated types, can improve adhesion to metal of rubbers and dispersion of filler in rubbers.