Crosslinkable polycarbonate resins having improved properties are disclosed. The crosslinkable polycarbonate resins are formed from a reaction of at least a benzophenone, a first dihydroxy chain extender, and a carbonate precursor, and may include a second dihydroxy chain extender as well.

A polycarbonate resin composition containing 0.1 to 10 parts by mass of a polycarbonate copolymer (B) having carbonate bonding between (B1) bisphenol A and a (B2) polyalkylene glycol and 0.005 to 0.5 parts by mass of a phosphorus-containing stabilizer (C) relative to 100 parts by mass of a polycarbonate resin (A).

A catalyst system includes a transition metal salt containing a halo group, an acetate group, or a combination thereof, and an organic phosphine ligand. The molar ratio of the organic phosphine ligand to the transition metal salt is greater than 0 and less than or equal to 50.

The objective of the present invention is to provide a method for producing a polycarbonate safely and efficiently. A method for producing a polycarbonate is characterized in comprising the step of irradiating a light to a composition comprising a C.sub.1-4 halogenated hydrocarbon, the specific diol compound and the specific base in the presence of oxygen.

The invention provides liquid injectable copolymers of TMC and HTMC that are degradable in vivo. Degradation can be tailored by adjusting the amount of HTMC in the copolymer, the initial molecular weight of the copolymer, and the characteristics of the initiator used in its preparation. Specifically, the degradation rate increases as the amount of HTMC incorporated into the copolymer increases, as the molecular weight of the copolymer decreases, and as the hydrophobicity of the initiator decreases. Moreover, the degradation yields products such as glycerol and carbon dioxide that are non-toxic in vivo, and which will not cause a substantive change in tissue pH upon implantation in vivo. The copolymers may be used in applications such as drug delivery and as coatings.

A polyester carbonate 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), a structural unit derived from a dicarboxylic acid or a derivative thereof, and a structural unit derived from a carbonic acid diester. The polyester carbonate can be used, e.g., in optical systems. ##STR00001##

A polymeric binder includes an ion-conducting polymer containing a polymer and a metal ion. The polymer is preferably selected from the group consisting of polyester, polyether, anionic polymer, polycarbonate, and silicone. An all-solid-state secondary battery includes an inorganic solid electrolyte, and the inorganic solid electrolyte in at least an electrode mixture layer or an inorganic solid electrolyte layer is bound together by the polymeric binder.

A method for producing a polycarbonate copolymer which has siloxane constituent units represented by any of formulae (1-1) to (1-4) and prescribed polycarbonate constituent units, the method having a polymerization step for polymerizing a silane-based compound selected from among a prescribed diaryloxysilane compound, a prescribed dialkoxysilane compound and a prescribed silicon compound, a carbonate compound and a diol compound such as an aromatic diol compound or an alicyclic diol compound in the presence of a transesterification catalyst. The polymerization step is carried out in a molten state under reduced pressure while removing alcohols derived from the carbonate compound.

##STR00001##

A polycarbonate resin composition having a structural unit represented by formula (1), a structural unit represented by formula (2), and a structural unit represented by formula (3):

##STR00001## wherein, in formula (3), R.sub.1 to R.sub.4 each independently represents a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, an alkyl group containing 1 to 6 carbon atoms, or an aryl group containing 6 to 20 carbon atoms which may optionally include a heterocyclic atom selected from an oxygen atom, a nitrogen atom and a sulfur atom, an alkenyl group containing 2 to 6 carbon atoms, an alkoxy group containing 1 to 6 carbon atoms or an aralkyl group containing 7 to 17 carbon atoms; p, q, r and s each independently represents an integer of 0 to 4; and i represents an integer of 1 to 10, and ii represents an integer of 0 to 10.

A polycarbonate resin composition having a structural unit represented by formula (1), a structural unit represented by formula (2), and a structural unit represented by formula (3):

##STR00001## wherein, in formula (3), R.sub.1 to R.sub.4 each independently represents a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, an alkyl group containing 1 to 6 carbon atoms, or an aryl group containing 6 to 20 carbon atoms which may optionally include a heterocyclic atom selected from an oxygen atom, a nitrogen atom and a sulfur atom, an alkenyl group containing 2 to 6 carbon atoms, an alkoxy group containing 1 to 6 carbon atoms or an aralkyl group containing 7 to 17 carbon atoms; p, q, r and s each independently represents an integer of 0 to 4; and i represents an integer of 1 to 10, and ii represents an integer of 0 to 10.