| abstract |
The present invention provides a polyvinyl acetal-based resin which has a high elastic modulus, is excellent in solubility to an alcoholic solvent, and gives a highly transparent alcohol solution. The polyvinyl acetal-based resin is obtained by acetalizing a polyvinyl alcohol-based resin (A) which has 0.1 to 1.5% by mol of a 1,2-diol structural unit represented by the following general formula (1) and a degree of saponification of 98.5% by mol or more: n n n n n n n n n n wherein R 1 , R 2 , and R 3 each independently represents a hydrogen atom or an organic group; X represents a single bond or a bonding chain; and R 4 , R 5 , and R 6 each independently represents a hydrogen atom or an organic group. |