Provided is a polycarbonate-polyorganosiloxane copolymer, which is produced by using a diol monomer (a1) and a polyorganosiloxane (a2) satisfying the following condition, including: a polyorganosiloxane block (A-1) including a specific repeating unit; and a polycarbonate block (A-2) formed of a specific repeating unit: a mixture, which is obtained by bringing the diol monomer (a1), the polyorganosiloxane (a2), a carbonic acid diester, and a basic catalyst present at the same amount ratio as that at a time of production of the polycarbonate-polyorganosiloxane copolymer into contact with each other at from 100° C. to 250° C. for from 0.5 hour to 5 hours, has a haze value of 30 or less measured under conditions of 23° C. and an optical path length of 10 mm in conformity with ISO 14782:1999.

An object of the present invention is to provide a novel production method of a poly(ester)carbonate. The present invention relates to a production method of a poly(ester)carbonate, including subjecting a diol and a carbonate ester to a transesterification reaction in the presence of a catalyst, wherein the catalyst comprises aluminum or a compound thereof, and a phosphorus compound.

Provided is a polycarbonate-polyorganosiloxane copolymer, including: a polyorganosiloxane block (A-1) including a specific structural unit; and a polycarbonate block (A-2) formed of a specific repeating unit, wherein the polycarbonate-polyorganosiloxane copolymer satisfies the following condition (A) or (B): condition (A): a hexane extraction amount of the polycarbonate-polyorganosiloxane copolymer is 150 ppm or less; and condition (B): average weights of polyorganosiloxane blocks in polycarbonate-polyorganosiloxane copolymers obtained by separating the polycarbonate-polyorganosiloxane copolymer with a gel permeation chromatograph satisfy a specific expression.

The purpose of the present invention is to provide a high temperature/humidity resistant polycarbonate resin without using bisphenol A as a raw material. The present invention relates to a polycarbonate resin comprising the repeating units of formulas (1), (2) and (3), wherein the content of the repeating unit of formula (3) is 5 mol% to 50 mol%, and the refractive index is 1.570 to 1.600. {In formula (1), R.sub.1 and R.sub.2 each represent a hydrogen atom or a C.sub.1-10 hydrocarbon group.} {In formula (3), n ranges from 0 to 8, and the R symbols are each selected from C.sub.1-3 alkyl groups}. ##STR00001##

A copolymerized polycarbonate resin having, at least, a constituent unit (A) and a constituent unit (B). The constituent unit (A) is derived from a dihydroxy compound. The carbonate constituent unit (B) is derived from a polyoxyalkylene glycol. A weight ratio of the constituent unit (B) derived from a polyoxyalkylene glycol to a weight of the copolymerized polycarbonate resin is preferably more than 20 wt % and 99 wt % or less.

The present disclosure relates to a polycarbonate and a preparation method thereof, which has a novel structure with an improvement in weather resistance and refractive index, while having excellent mechanical properties.

A method for preparing a polycarbonate ester includes feeding a monomer mixture containing (i) at least one compound selected from the group consisting of compounds of the following Formulae 1 and 3; (ii) a compound of the following Formula 2; and (iii) a 1,4:3,6-dianhydrohexitol to a polycondensation reactor and allowing the monomers and the 1,4:3,6-dianhydrohexitol to react to prepare the polycarbontate ester. The prepared polycarbonate ester has improved mechanical properties including tensile strength and impact strength: ##STR00001##

The present application provides a polycarbonate resin including structural units (A) represented by general formula (1) and structural units (B) represented by general formula (4).

##STR00001##

(In general formula (1), R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, and R.sub.8 each independently represents a hydrogen atom, etc., and X represents —O—, etc.)

##STR00002##

(In general formula (4), R.sub.z and R.sub.x each independently represents a hydrogen atom or a C1-3 alkyl group, i represents an integer 3-10 and p represents an integer 5-600.)

The present invention relates to a polycarbonate composite, a producing method thereof, and a molded article comprising same. More specifically, the present invention relates to: a polycarbonate composite comprising a matrix resin, which is a polycarbonate resin in which an anhydrosugar alcohol is copolymerized, and a nanomaterial dispersed in the matrix resin, wherein the polycarbonate composite exhibits a more remarkably improved tensile modulus and tensile strength than a conventional biopolycarbonate resin composite, by using, as a diol component, a solid dispersion or molten dispersion obtained by introducing a nanomaterial (dispersible substance) into an anhydrosugar alcohol (dispersion medium) in the form of an aqueous dispersion at the time of manufacture, and has uniform physical properties as the nanomaterial is uniformly dispersed in the composite; a producing method thereof; and a molded article comprising same.

Provided is a polycarbonate polyol used as a raw material of a polyurethane that yields a polyurethane solution having good storage stability and exhibits excellent flexibility and solvent resistance. This polycarbonate polyol is a polycarbonate diol that includes structural units represented by the following Formulae (A) and (B), wherein, R.sup.1 and R.sup.2 each independently represent an alkyl group having 1 to 4 carbon atoms and, in this range of the number of carbon atoms, optionally have an oxygen atom, a sulfur atom, a nitrogen atom, a halogen atom, or a substituent containing these atoms; and R.sup.3 represents a linear aliphatic hydrocarbon having 3 or 4 carbon atoms. This polycarbonate diol has a molecular weight of 500 to 5,000, and the value of the following Formula (I) is 0.3 to 20.0: (Content ratio of branched-chain moiety in polymer)/(Content ratio of carbonate group in polymer)×100(%) (I). ##STR00001##