Sumitomo Chemical Company, Limited

Akira Tanoue

Masatsune Kondo

A process for preparing polymer resins by polymerization of at least one ethylenic monomer onto at least one rubbery polymer optionally grafted with at least one ethylenic monomer which comprises initiating the polymerization in an emulsion system, adding a suspension stabilizer to the polymerization system at the stage after the conversion of the ethylenic monomer to be polymerized reaches 5% by weight and before the emulsion system is broken and then continuing the polymerization in a suspension system until completion of the polymerization. By the process, polymer resins can be produced in particles having a beautiful appearance and an even particle size with a narrow range of particle size distribution.

Process for preparing polymer resins

A process for preparing polymer resins of high impact resistance which comprises coagulating a latex of a rubbery polymer grafted or not with at least one ethylenic monomer in the presence of a suspension stabilizer and a coagulating agent to make a stable aqueous suspension of coagulated particles of said rubbery polymer, adding at least one ethylenic monomer to the aqueous suspension and subjecting the resultant mixture to suspension polymerization.

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Niihama, Japan

Akira Tanoue