Abstract
In order to obtain calcium carbonate which is combined chemically to SBR, we tried to cover a part of surfaces of calcium carbonate with SBR latex which was perliminarrily treated with thiolacids.
A typical example is as follows; SBR latex was treated with thioglycolacid under several conditions, and was reacted with calcium hydroxide. Into the reaction product a stream of carbon dioxide was introduced.
In these ways, much better reinforcing fillers compared with any of calicium carbonate treated by known agents were obtained for SBR. For example, 300% modulus was about twice, and tensile strenght at break was triple as untreated calcium carbonate.
