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.

The present invention makes it possible to provide a polycarbonate copolymer including structural units represented by general formula (K) and structural units represented by general formula (1).

##STR00001##

(In general formula (K), R represents H, CH.sub.3 or CH.sub.2CH.sub.3.)

##STR00002##

(In general formula (1), Q represents a C5 or higher aliphatic hydrocarbon group optionally including a hetero atom.)

A high molecular weight aromatic polycarbonate resin manufacturing method that can achieve good quality and sufficiently high molecular weight includes: a step in which a dialcohol compound expressed by general formula (1) and a catalyst are mixed to obtain a catalyst composition; a step in which the obtained catalyst composition is transferred to a prepolymer mixing tank via a transfer pipe; a step in which the transferred catalyst composition and an aromatic polycarbonate prepolymer are mixed in the prepolymer mixing tank, under a pressure that is greater than or equal to the vapor pressure of the dialcohol compound at the temperature of the prepolymer mixing tank and is less than or equal to 5 MPa, to obtain a prepolymer mixture; and a high molecular weight achievement step in which the obtained prepolymer mixture is heat-treated under reduced pressure conditions to obtain a high molecular weight aromatic polycarbonate resin.

##STR00001##

A series of renewable bisphenols has been synthesized from creosol (2-methoxy-4-methylphenol) through stoichiometric condensation with short chain aldehydes. Creosol can be readily produced from lignin, potentially allowing for the large scale synthesis of bisphenol A replacements from abundant waste biomass. The renewable bisphenols were isolated in good yield and purity without resorting to solvent intense purification methods. Zinc acetate was shown to be selective catalyst for ortho-coupling of formaldehyde but was unreactive with more sterically demanding aldehydes. Dilute HCl and HBr solutions were shown to be effective catalysts for the selective coupling of aldehydes in the position meta to the phenol. Acid solutions could be recycled and used multiple times without decreases in activity or yield.

Provided is a high molecular weight aromatic polycarbonate resin manufacturing method that suppresses the occurrence of heterogeneous structures and can achieve a sufficiently high molecular weight. A high molecular weight aromatic polycarbonate resin manufacturing method including: a step in which a dialcohol compound expressed by general formula (1) and a catalyst are mixed to obtain a catalyst composition; a step in which the obtained catalyst composition is transferred to a prepolymer mixing tank via a transfer pipe, with a transfer period of 10 hours or less; a step in which the transferred catalyst composition and an aromatic polycarbonate prepolymer are mixed in the prepolymer mixing tank to obtain a prepolymer mixture; and a high molecular weight achievement step in which the obtained prepolymer mixture is heat-treated under reduced pressure conditions to obtain a high molecular weight aromatic polycarbonate resin.

The present invention relates to curable solid particulate compositions that include: (a) a first reactant having at least two cyclic carbonate groups; and (b) a second reactant having at least two active hydrogen groups that are reactive with the cyclic carbonate groups of the first reactant. With some embodiments, the first reactant is a polyol residue having at least two cyclic carbonate groups, such as bisphenol A that has been reacted with epichlorohydrin, and in which the oxirane groups thereof have been converted to cyclic carbonate groups. The active hydrogen groups of the second reactant, with some embodiments, are each independently selected from hydroxyl groups, thiol groups, and amine groups. The curable solid particulate compositions, with some embodiments, are in the form of curable powder coating compositions.

A polycarbonate resin composition including a carbonate structural unit (X) derived from an aromatic dihydroxy compound represented by the following formula (1), a carbonate structural unit (Y) derived from an aromatic dihydroxy compound represented by the following formula (2), and a carbonate structural unit (Z) derived from an aromatic dihydroxy compound represented by the following formula (3). A molar ratio of the content of the carbonate structural unit (Y) to the carbonate structural unit (X) is 0.65 or more, and the content of the carbonate structural units (Y) in 100 mol % of all carbonate structural units of the polycarbonate resin composition is 49 mol % or less.

##STR00001##

(R.sup.1 and R.sup.2 represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, or a substituted or unsubstituted aryl group. R.sup.1 and R.sup.2 may be bonded to each other to form a ring)

##STR00002##

(W represents O, S, SO.sub.2, or CR.sup.3R.sup.4. R.sup.3 and R.sup.4 represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, or a substituted or unsubstituted aryl group. R.sup.3 and R.sup.4 may be bonded to each other to form a ring)

According to the present invention, there can be provided a thermoplastic resin comprising a constituent unit (A) derived from a monomer represented by the following general formula (1):

##STR00001## wherein R.sub.1 to R.sub.12, Rk, and Rp each independently represent a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a cycloalkyl group containing 5 to 20 carbon atoms, a cycloalkoxyl group containing 5 to 20 carbon atoms, an aryl group containing 6 to 20 carbon atoms, a linear or branched alkyl group containing 1 to 10 carbon atoms, an alkenyl group containing 2 to 10 carbon atoms, an alkoxy group containing 1 to 10 carbon atoms, a heteroaryl group containing 6 to 20 carbon atoms, which comprises one or more heterocyclic atoms selected from O, N and S, or an aralkyl group containing 7 to 20 carbon atoms, and X and Y represent a single bond or an alkylene group containing 1 to 5 carbon atoms, i and ii each independently represent an integer of 0 to 4, and K.sub.1 and K.sub.2 each independently represent OH, COOH, or COORq, wherein Rq represents an alkyl group containing 1 to 5 carbon atoms.

The present invention relates to a polycarbonate resin containing, in the molecule, a structure represented by the following formula (1): ##STR00001##
wherein X has a structure represented by any one of the following formula (2) to (4): ##STR00002##
wherein each of R.sup.1 to R.sup.4 independently represents a hydrogen atom or an organic group having a carbon number of 1 to 30; the organic group may have an arbitrary substituent, and any two or more members of R.sup.1 to R.sup.4 may combine with each other to form a ring, which is excellent in heat resistance, transparency, light resistance, weather resistance and mechanical strength.

Disclosed is a polycarbonate resin including a constitutional unit represented by Formula (1). The resin provides a molded article having a sufficiently low Abbe number and excellent durability under high temperature and high humidity. R.sup.1 to R.sup.4 are a hydrogen atom or a substituent having .sub.p of less than 0.15, R.sup.5 to R.sup.7 represent a substituent, Ar.sup.11 and Ar.sup.12 represent an aryl or heteroaryl group, and Ar.sup.13 is an aromatic fused ring group.

##STR00001##