Abstract
Resin components act as diluents and plasticizers that can degrade the stress–strain properties of cured rubber compositions prepared from natural polyisoprene latices. Lipase-catalyzed hydrolysis is an effective means of reducing the resin content of latex. By using a commercial lipase that is active at the pH of ammoniated latex, the resin contents of Hevea and guayule latices were reduced by about 7 and 33%, respectively. Maximum conversions of the latex resin triglycerides were obtained within about 12 h at 37°C. The recovery and recycle of lipase were easily effected.
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