| 摘要 |
PURPOSE:To provide water-contg. gel substance useful as heat-insulating material, etc. obtd. by dispersing water in the presence of a surfactant into a rubber component consisting mainly of polyisoprene rubber having a specified property to produce water-in-oil type dispersion and then curing the dispersion with a crosslinking agent. CONSTITUTION:Isoprene monomer is polymerized by a polymn. process such as Ziegler polymn. or anionic polymn. to prepare liquid polyisoprene rubber contg. not less than 70% of polymerized cis-1,4 addition units and having an MW of 8,000-120,000. Alternatively, maleic anhydride or a derivative thereof is added to the liquid polyisoprene rubber to prepare modified liquid polyisoprene rubber. Then water is dispersed in the presence of a surfactant having an HLB value of preferably 4-10 such as polyoxyethylene oleyl ether into the rubber component consisting mainly of the above (modified) liquid polyisoprene rubber to produce water- in-oil type dispersion. The dispersion is cured with a crosslinking agent such as sulfur to obtain the desired water-contg. gel substance.
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