Preparation process of chlorinated rubber
AssigneeAsahi Denka Kogyo Kabushiki Kaisha
InventorsHiroshi Tsuchiya, Makoto Kokura, Yutaka Ozawa, Takaaki Sugimura
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Abstract
Disclosed herein is a process for the preparation of a chlorinated rubber, wherein chlorine gas is caused to act on a polyisoprene rubber to prepare the chlorinated rubber. Chlorine gas is blown into a high-acidity aqueous dispersion of the polyisoprene rubber to chlorinate the polyisoprene rubber, whereby a chlorinated isoprene rubber with high performance is prepared stably in an aqueous medium.
Claims15
A process for the preparation of a chlorinated rubber wherein chlorine gas is reacted with a polyisoprene rubber to form a chlorinated rubber, the improvement comprising:
- preparing an aqueous dispersion of said polyisoprene rubber;
- preparing an aqueous acid solution having a high concentration of acid;
- adding said aqueous dispersion of polyisoprene rubber dropwise into said aqueous acid solution while blowing chlorine gas into the said aqueous acid solution, thereby chlorinating said polyisoprene rubber and forming a chlorinated rubber product.
A process for the preparation of a chlorinated rubber wherein chlorine gas is reacted with a polyisoprene rubber to form a chlorinated rubber, the improvement comprising:
- preparing an aqueous dispersion of said polyisoprene rubber;
- preparing an aqueous acid solution having an acid concentration between about 2 wt. % and 40 wt. %;
- dropwise adding or spraying said aqueous dispersion of polyisoprene rubber into said aqueous acid solution while blowing chlorine gas into said aqueous acid solution, thereby chlorinating said polyisoprene rubber and forming a chlorinated rubber product.
A process for the preparation of a chlorinated rubber wherein chlorine gas is reacted with a polyisoprene rubber to form a chlorinated rubber, the improvement comprising:
- preparing an aqueous dispersion of said polyisoprene rubber;
- preparing an aqueous acid solution having an acid concentration between about 2 wt. % and 40 wt. %;
- adding said aqueous dispersion of polyisoprene rubber into said aqueous acid solution in a manner such that no aggregation of the polyisoprene rubber particles occurs and wherein the average particle size of said polyisoprene rubber in the aqueous dispersion is 100.mu.m or smaller, while blowing chlorine gas into said aqueous acid solution, thereby chlorinating said polyisoprene rubber and forming a chlorinated rubber product.
Dependencies are inferred from the claim text.