The present invention relates to a polycarbonate copolymer, a method for producing same, and a molded product comprising same, and more specifically, to: a polycarbonate copolymer exhibiting biodegradability and improved tensile strength and elongation compared to conventional polycarbonate copolymers due to including repeating units derived from a carbonate diester component and a diol component containing anhydrosugar alcohol, anhydrosugar alcohol-alkylene glycol, and aromatic diol in a specific content ratio; a method for producing the polycarbonate copolymer; and a molded article comprising the polycarbonate copolymer.

Provided is a polycarbonate resin having a relaxation time of 2 seconds to 15 seconds at 250 C. and a residual phenol content of 3,000 ppm or less.

A polycarbonate resin includes a constituent unit (a) given by general formula (1-IA); a constituent unit (b) given by general formula (1-1A), but different from the constituent unit (a); a constituent unit (c-1) given by general formula (1-2A) or a constituent unit (c-2) given by general formula (3-1); and a constituent unit (d) given by general formula (2), wherein the content of the constituent unit (a) is 1-50 mol %, the content of the constituent unit (b) is 1-70 mol %, the content of the constituent unit (c-1) or (c-2) is 1-50 mol %, and the content of the constituent unit (d) is 1-30 mol %, in each case with reference to the total amount of the constituent units (a) to (d).

According to one embodiment, a polyester resin is provided, which includes a structural unit derived from a compound represented by general formula (1), a structural unit derived from a compound represented by general formula (2), and a structural unit derived from a dicarboxylic acid or a derivative thereof.

##STR00001##

Disclosed are a hydroxy-capping monomer, its polycarbonate and an article including the same. Disclosed is a capping monomer capable of greatly improving mechanical properties and weather resistance when applied to polycarbonate, and polycarbonate containing the same, being prepared at high economic efficiency and having superior mechanical properties and excellent weather resistance.

The purpose of the present invention is to provide: a polycarbonate resin which can satisfy all of a refractive index, an Abbe number, heat resistance, and birefringence; and an optical member containing the same. This thermoplastic resin contains repeating units represented by formula (1), formula (2) and formula (3), contains 60 mol % or more of repeating units represented by formula (1), and has a refractive index of more than 1.600 and not more than 1.660. (In formula (1), R.sup.1 to R.sup.4 each independently denote a hydrogen atom or a hydrocarbon group having 1-10 carbon atoms.) (In formula (3), n falls within the range 1-8, R.sup.5 and R.sup.6 each independently denote a hydrogen atom or a hydrocarbon group having 1-10 carbon atoms, and R.sup.7 denotes a hydrogen atom or an alkyl group having 1-3 carbon atoms.)

The present application provides: a polycarbonate resin which has heat resistance and is able to be produced using a starting material that is derived from natural products; and a monomer compound which enables the achievement of this resin. A polycarbonate resin which includes a constituent unit represented by general formula (1); a monomer compound which enables the achievement of this resin; and a polycarbonate resin which includes a constituent unit represented by general formula (1) and a constituent unit represented by general formula (2). ##STR00001##

A thermoplastic resin includes a constituent unit (A) derived from a monomer represented by general formula (1).

##STR00001##

(In the formula, each R.sub.1 independently represents a C6-14 aryl group or a C7-17 aralkyl group, each R.sub.2 independently represents a hydrogen atom, a C6-14 aryl group, or a C7-17 aralkyl group, each a independently represents an integer of 0 or 1-3, each R.sub.3 independently represents OH or O(CH.sub.2).sub.nOH, and n represents an integer of 1-4.)

A process, apparatus, and material for generating polymers are disclosed. Generating the polymers comprises reacting carbon dioxide (CO.sub.2) with a cyclopropenimine (CPI). Generating the polymers further comprises reacting monomers with a product of the reaction between the CPI and the CO.sub.2.

A resin contains a constitutional unit (A) derived from a monomer represented by general formula (1) and that is a polycarbonate resin or a polyester carbonate resin.

##STR00001##

In the formula, each R.sup.1 independently a hydrogen atom, a C1-4 alkyl group, or a phenyl group. X is a direct bond or a divalent group that is represented by formula (Y).

##STR00002##

In the formula, each R.sup.2 and each R.sup.3 is independently a hydrogen atom, an alkyl group, or an aryl group, or each R.sup.2 and each R.sup.3 may bind to one another to form a ring together with an adjacent carbon atom, and the ring may be substituted by an alkyl group. n is 0 or 1. * represents a binding position.