Poly(vinyl alcohol) resin
The present invention provides a polyvinyl alcohol resin with which a polyvinyl acetal resin having a controlled particle size and forming less lumps during dissolution to exhibit excellent solubility can be produced. Provided is a polyvinyl alcohol resin containing: methyl acetate; a vinyl alcohol unit; and a vinyl acetate unit, the methyl acetate being contained in an amount of 0.05 to 3% by weight, the vinyl alcohol unit being contained in an amount of 80 to 99.5 mol %, the vinyl acetate unit having a mean chain length L A of 1 to 4.5, the vinyl alcohol unit having a mean chain length L O of 1 to 30.
1 . A polyvinyl alcohol resin comprising:
methyl acetate;
a vinyl alcohol unit; and
a vinyl acetate unit,
the methyl acetate is contained in an amount of 0.05 to 3% by weight, the vinyl alcohol unit is contained in an amount of 80 to 99.5 mol %, the vinyl acetate unit has a mean chain length L A of 1 to 4.5, the vinyl alcohol unit has a mean chain length L O of 1 to 30.
2 . The polyvinyl alcohol resin according to claim 1 ,
which has a degree of polymerization of 1,000 to 4,000.
3 . The polyvinyl alcohol resin according to claim 1 ,
wherein the vinyl alcohol unit is contained in an amount of 86.0 to 99.3 mol %.
4 . The polyvinyl alcohol resin according to claim 1 ,
which is for use in production of a polyvinyl acetal resin.