| 摘要 |
A laminate is provided, in which a plasticizer is not easily extracted with water and does not easily volatilize, water or the plasticizer does not easily cause phase separation from a polyvinyl acetal, and water or the plasticizer does not easily bleed between layers even when the laminate having a high water content is rapidly dried in an atmosphere of a low temperature and a low humidity. The laminate comprises a layer A including a polyvinyl acetal (A), a plasticizer (Ap), and a dispersant (Ad), and a layer B including a polyvinyl acetal (B) and a plasticizer (Bp) and optionally including a dispersant (Bd). A mass ratio of the dispersant (Ad) with respect to the plasticizer (Ap) is larger than a mass ratio of the dispersant (Bd) with respect to the plasticizer (Bp). The plasticizer (Ap) is an ester compound of an m-valent alcohol (m represents a natural number of 2 to 4) with m molecules of a monovalent carboxylic acid having 8 to 16 carbon atoms. The dispersant (Ad) is obtained by hydrolyzing the plasticizer (Ap). The plasticizer (Bp) is an ester compound of one molecule of an n-valent alcohol (n represents a natural number of 2 to 4) with n molecules of a monovalent carboxylic acid having 8 to 16 carbon atoms. The dispersant (Bd) is obtained by hydrolyzing the plasticizer (Bp). |
