Abstract: A polycarbonate diol composition contains: a polycarbonate diol containing a structural unit (1) derived from a compound (1) represented by the following general formula (1); HO—(CH2)n—OH (1) (n is an integer of 3 to 6) and an aldehyde having 3 or more and 8 or less carbon atoms. A method for producing a polycarbonate diol composition, includes: polycondensing a carbonate compound and a dihydroxy compound composition containing a compound (1) represented by the following general formula (1) and an aldehyde having 3 or more and 8 or less carbon atoms by a transesterification reaction in the presence of a catalyst, to obtain a polycarbonate diol composition containing a polycarbonate diol. A polyurethane is obtained by using this polycarbonate diol composition.

Abstract: A polycarbonate diol contains a structural unit (1) represented by the following general formula (I) and a structural unit (2) represented by the following general formula (II). (In the general formula (I), R represents a hydrocarbon group having 2 to 20 carbon atoms, which may have a substituent or a hetero atom.) (In the general formula (II), m is an integer of 2 to 20. R2 represents an alkyl group having 1 to 20 carbon atoms which may have a substituent, or a hydrogen atom.

Abstract: A polycarbonate diol composition contains: a polycarbonate diol containing a structural unit (1) derived from a compound (1) represented by the following general formula (1); HO—(CH2)n—OH (1) (n is an integer of 3 to 6) and an aldehyde having 3 or more and 8 or less carbon atoms. A method for producing a polycarbonate diol composition, includes: polycondensing a carbonate compound and a dihydroxy compound composition containing a compound (1) represented by the following general formula (1) and an aldehyde having 3 or more and 8 or less carbon atoms by a transesterification reaction in the presence of a catalyst, to obtain a polycarbonate diol composition containing a polycarbonate diol. A polyurethane is obtained by using this polycarbonate diol composition.

Abstract: The present invention relates to a moisture-proof laminated film having, on the substrate thereof, an inorganic thin film layer and having, on the inorganic thin film layer, a plastic film via a polyurethane adhesive satisfying the following requirement (1), or the following requirements (1) and (2). The moisture-proof laminated film keeps excellent moisture-proofness and interlayer strength even after exposed to high temperature condition. (1) ?0.1?E21?+0.5. (2) ?0.3?E23?+0.3. (In the above formulae, E21 indicates (E2?E1)/E2, and E23 indicates (E2?E3)/E2. E1, E2 and E3 each mean the tensile storage elastic modulus of the adhesive under specific conditions.