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Functionalised liquid rubber materials

von Dr. Dirk Kilian, Ralph Boehm, Mizuho Maeda

The production of rubber goods is always a tightrope walk between costs and performance. In order to support processors to achieve a maximum of advantages, Kuraray has developed a series of functionalised liquid rubbers with different molecular weights (5,000 – 70,000). Kuraray liquid rubbers (KLR) are designed to have a plasticising effect and vulcanisability with solid rubbers. They consist of isoprene, butadiene, and styrene at the polymer backbone and partly vary at the side chains for interface to polar phases.

The unsaturated CC-bond in the backbone provides crosslinkable points. Therefore, they are called reactive or co-curable plasticiser. The KLRs are available as homopolymer type (standard grade), copolymer type and modified type. Their use leads to improvements in a wide range of applications: rubber goods (tyres, belts), adhesives (solution, hotmelt, latex, UV-cured), automotive sealants, construction and other applications (printing plates, coatings). LIR-403 and LIR-410, the polar modified types of KLR, have additional function besides their plasticising effect and vulcanisability. The carboxylated function can improve the adhesion of rubber to metal and the dispersion of fillers in rubber.