| 摘要 |
PURPOSE:To polymerize a vinyl monomer without deposition of polymer scale on the inside surface of a polymerizer, by previously coating the inside surface of the polymerizer with a specified reaction product and polymerizing the monomer in an aqueous medium in the polymerizer. CONSTITUTION:In polymerizing a vinyl monomer in an aqueous medium, the inside surface of the polymerizer is previously coated with a reaction product between a high-molecular alcohol having hydroxyl groups in the molecule and a phenolic aldehyde. Examples of the vinyl monomers which can be applied include vinyl chloride and a mixture thereof with a monomer copolymerizable therewith. Examples of the high-molecular alcohols having hydroxyl groups in the molecule include polyvinyl alcohol prepared by saponifying polyvinyl acetate, etc. Examples of the phenolic aldehydes include hydroxybenzaldehyde, resorcylaldehyde and gentisaldehyde.
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