Poly(ether sulfones) (PES) and poly(ether amide sulfones) (PEAS) were prepared from post-consumer polycarbonates and polyesters, respectively, using a single vessel in batch mode (all reactants present when heating was initiated). The depolymerization of the initial polymer occurs concurrently with step growth polymerization to form a product polymer having a number average molecular weight of at least 5000.

Provided is a polycarbonate resin having excellent solubility in low-boiling-point non-halogenated solvents and having a high glass transition temperature. The polycarbonate resin includes constituent units (A) represented by general formula (1) (for example 4,4-(4-methylpentane-2,2-diyl)diphenol) and constituent units (B) represented by general formula (2) (for example 4,4-(1-phenylethane-1,1-diyl)diphenol), the molar ratio of the constituent units (A) to the constituent units (B), A/B, being 45/55 to 95/5, and includes a terminal structure selected from formula (T1) (for example p-t-butylphenol) and/or formula (T2) (for example 3-(2H-benzotriazol-2-yl)-4-hydroxyphenethylmethacrylate). ##STR00001##

Provided are a diol compound which may be used to prepare a polycarbonate having excellent weather resistance, hardness, heat resistance, transparency, impact resistance, etc. while having excellent mechanical properties, a polycarbonate prepared by using the same, and a preparation method thereof.

Provided are a resin including a unit of Chemical Formula 1, a method for preparing the same, a resin composition including the same, and a molded article including the resin composition:

##STR00001## wherein all the variables are described herein.

Methods for forming a crystalline form or an amorphous form of 6,6-diphenyl-2,2-bis(2-hydroxyethoxy)-1,1-binaphthyl and thermoplastic resin therefrom. According to one embodiment, a crystal solvate form of 6,6-diphenyl-2,2-bis(2-hydroxyethoxy)-1,1-binaphthyl, which contains in its crystals from 0.3 to 1.2 mol of an organic solvent per 1 mol of 6,6-diphenyl-2,2-bis(2-hydroxyethoxy)-1,1-binaphthyl, where the organic solvent is selected from the group consisting of methanol, toluene, and methyl ethyl ketone.