Provided is a polycarbonate polyol composition comprising an unmodified polycarbonate polyol having a carbonate structure represented by the following formula (A), and a modified polycarbonate polyol having a carbonate structure represented by the following formula (A) and a urethane structure represented by the following formula (B), wherein 90% by mol or more of the total quantity of terminal groups of all the compounds in the composition is hydroxy groups, and the number of functional groups calculated according to the following expression (II) is 2.00 to 10.00:

The number of functional groups=Mn×OHV/56.11/1000   (II)

##STR00001##

Provided is a polycarbonate resin having a structural unit (I) represented by formula (1) below:

##STR00001##

wherein L.sup.1 and L.sup.2 each independently represent a divalent linking group selected from an alkylene group, a cycloalkylene group, an arylene group, an oxyalkylene group, an oxyarylene group, and a group formed by combining two or more of these, where one or more hydrogen atoms of the linking group are optionally further replaced with substituents, and two of the substituents are optionally bonded to each other to form a ring structure.

Provided is a polycarbonate resin composition containing polycarbonate resin (A) having structural units represented by general formula (1) and polycarbonate resin (B) having a structural unit represented by general formula (2): ##STR00001##
(in general formula (1), R represents a hydrogen atom or C.sub.1-C.sub.4 alkyl group); ##STR00002##
(in general formula (2), R.sup.1 and R.sup.2 each independently represent a hydrogen atom, C.sub.1-C.sub.20 alkyl group, C.sub.1-C.sub.20 alkoxyl group, C.sub.5-C.sub.20 cycloalkyl group, C.sub.5-C.sub.20 cycloalkoxyl group, C.sub.6-C.sub.20 aryl group or C.sub.6-C.sub.20 aryloxy group, and Y represents a C.sub.1-C.sub.4 alkylene group.)

To provide a polycarbonate resin having an excellent hue and high heat stability, and a production method and a film thereof. The polycarbonate resin has a carbonate constituent unit represented by the following formula (A), wherein the resin contains a terminal group represented by the following formula (1) or (2) and 0.1 to 500 ppm of an aromatic monohydroxy compound. ##STR00001## (In the formula (1), R.sub.1 is an alkyl group having 6 to 15 carbon atoms which may be substituted.) ##STR00002## (In the formula (2), R.sub.2 and R.sub.3 are each independently an alkylene group having 1 to 12 carbon atoms which may be substituted. R.sub.4 is a hydrogen atom or alkyl group having 1 to 12 carbon atoms which may be substituted. n is an integer of 1 to 20.)

Provided is a polycarbonate resin composition containing polycarbonate resin (A) having structural units represented by general formula (1) and polycarbonate resin (B) having a structural unit represented by general formula (2):

##STR00001##

(in general formula (1), R represents a hydrogen atom or C.sub.1-C.sub.4 alkyl group);

##STR00002##

(in general formula (2), R.sup.1 and R.sup.2 each independently represent a hydrogen atom, C.sub.1-C.sub.20 alkyl group, C.sub.1-C.sub.20 alkoxyl group, C.sub.5-C.sub.20 cycloalkyl group, C.sub.5-C.sub.20 cycloalkoxyl group, C.sub.6-C.sub.20 aryl group or C.sub.6-C.sub.20 aryloxy group, and Y represents a C.sub.1-C.sub.4 alkylene group.)

The purpose of the present invention is to provide an aromatic polycarbonate oligomer solid with substantially reduced low-molecular-weight components, no or a substantially reduced amount of chlorine-containing compounds, high loose bulk density, and ease of handling. The aromatic polycarbonate oligomer solid contains a repeating unit represented by formula (1), has a weight average molecular weight of 500 to 10,000, low-molecular-weight components less than or equal to 5.0 area % measured with high-speed liquid chromatography, and a loose bulk density of greater than or equal to 0.22 g/cm.sup.3:

##STR00001##

Provided is a polycarbonate resin composition comprising: a polycarbonate resin comprising a constituent unit having an alicyclic hydrocarbon site where a carbonate group is linked to two carbon atoms that constitute a ring and are adjacent to each other; and one or two or more compounds selected from the group consisting of a compound having an amide bond, a sulfur compound, and a phosphite ester compound, wherein weight-average molecular weight Mw of the polycarbonate resin measured by size-exclusion chromatography using polystyrene as a standard sample is 50,000 or larger and 500,000 or smaller.

The present disclosure relates to a xanthene derivative compound with a high refractive index and a manufacturing method therefor. More specifically, provided herein is a compound that has a xanthene-based complex cardo structure and a high refractive index and can be used as a monomer in optical resins requiring a refractive index of 1.7 or higher, and a (co)polymer and an optical lens manufactured therefrom. Given, the xanthene-based complex cardo structure of the compound maximally suppresses the fluidity of the molecular chains and can find applications in the production of resins with high glass transition temperature and excellent thermal stability.

The present invention relates to a polycarbonate-based resin composition and a molded article thereof, and more specifically, to a polycarbonate-based resin composition exhibiting improved impact strength (impact resistance) and chemical resistance while including a glass fiber in a relatively small content, and a molded article formed therefrom.

The present invention relates to a polymerizable composition based on allyl carbonate monomers comprising: from 40% to 90% of a first reactive component (component A) comprising at least 50% by weight of diethylene glycol bis(allyl carbonate); from 10% to 60% of a second reactive component (component B) consisting of at least one compound having general formula (II)

##STR00001## or having general formula (III)

##STR00002## from 0.4 to 10.0 phm (parts by weight per 100 parts of the total weight of components A and B) of at least one peroxide radical initiator. The present invention also relates to the polymerized products that can be obtained from the above composition, their preparation process and their use as organic glass.