| 摘要 |
The purpose of the present invention is to provide a composition having little bleeding or turbidity of a plasticizer caused by water absorption, capable of easily controlling moisture when used as an intermediate film for laminated glass, and having excellent antistatic properties. Provided is a composition including: 30-75 parts by mass of a prescribed diester compound per 100 parts by mass of a polyvinyl acetal having an average residual hydroxyl group amount of 15-29 mol% and having an acetalization of 70-82 mol%; and 0-50 ppm sodium, 0-80 ppm potassium, and a total of 5-80 ppm sodium and potassium. A sheet obtained by molding said composition fulfils specific conditions for the total ion count for sodium and potassium ions relative to the C4H5O-ion count at each primary ion irradiation point, when performing secondary ion analysis using a time-of-flight-type secondary ion analysis device. |
