| 摘要 |
PROBLEM TO BE SOLVED: To provide a production method of an aqueous solution of PVA, having a few generation of foams and easy in handling, and to provide a production method of a polyvinyl acetal resin wherein the above solution is used without lowering of quality (particularly, an interlayer for a laminated glass), and excellent in workability. SOLUTION: An aqueous polyvinyl alcohol solution is produced by adding an aldehyde to the aqueous polyvinyl alcohol solution obtained by dissolving a polyvinyl alcohol in water. The polyvinyl acetal resin is produced by carrying out acetalization reaction using the above aqueous polyvinyl alcohol solution.
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