Abstract
Abstract Methyl methacrylate absorbed into dry natural rubber has been polymerized under conditions of low heat loss, using as initiator AZBN, alone or in combination with an activated peroxide. With AZBN as sole initiator, some deductions are made from the change of temperature with time, as to the change in molecular weight of the polymer formed as the. reaction proceeds. No graft polymer is formed. With the mixed catalyst system polymerization starts at room temperature. The process has been carried to a semitechnical scale, and some of the properties of the products are given. In general the materials resemble the corresponding materials prepared in natural rubber latex, but have markedly better hot-tear resistance. About 25% of the polymethyl methacrylate is present as a graft polymer.
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