A ternary composite catalyst of diethylzinc and yttrium trifluoroacetate loaded on chitin for copolymerization of carbon dioxide, epoxy cyclohexane and ethylene oxide is provided. The ternary composite catalyst exhibits strong catalytic activity for the ternary copolymerization of carbon dioxide, cyclohexane oxide and ethylene oxide. A high molecular weight and content of ester chain is maintained. Conventional rare earth ternary catalysts leave residues in the polymer, and the polymer requires rinsing with hydrochloric acid. The ternary composite catalyst can be removed through filtration. The average molecular weight of the resulting polycarbonate is more than 100,000, and the ester chain content is more than 90%. The resulting polymer has a lower metal content. The ternary composite catalyst can be used in agricultural film, disposable packaging and other polymer materials.

A resin composition contains: a resin containing a constituent unit (A) represented by general formula (1); and a resin containing a constituent unit (B) represented by formula (2) and/or a constituent unit (C) represented by formula (3). (R.sub.1 represents a methyl group or an ethyl group, R.sub.2 and R.sub.3 represent a hydrogen atom or a methyl group, and n represents 0 or 1.) (R.sub.a and R.sub.b represent a hydrogen atom, etc., R.sub.h represents an aryl group of 6-20 carbons, X represents a single bond or a fluorene group, A and B represent an alkylene group of 1-4 carbons, m and n represent integers 0-6, and a and b represent integers 0-10.) (R.sub.c and R.sub.d represent a hydrogen atom, etc., Y represents a fluorene group, A and B represent an alkylene group of 1-4 carbons, p and q represent integers 0-4, and a and b represent integers 0-10.)

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A method for preparing polyether carbonate alcohols by attaching cyclic carbonate to an H-functional starter substance in the presence of a catalyst, characterized in that a tribasic alkali- or alkaline earth metal phosphate is used as the catalyst, the alkali metal being selected from potassium or cesium.

The present invention is a polyester elastomer resin composition that has excellent extrusion moldability and surface smoothness even in a thin shape, while maintaining mechanical characteristics, and that is halogen-free and has excellent flame retardancy as well as heat aging resistance and hydrolysis resistance. The polyester elastomer resin composition comprises a polyester elastomer (A) and a phosphorus flame retardant (B); the polyester elastomer (A) comprises a hard segment composed of a polyester and at least one soft segment selected from aliphatic polyethers, aliphatic polyesters, and aliphatic polycarbonates, and has a Shore D surface hardness of 55 or less; the phosphorus flame retardant (B) has an average particle size D50 of 20 μm or less and a phosphorus concentration of 15 mass % or more; and the polyester elastomer resin composition comprises 5 to 50 parts by mass of the phosphorus flame retardant (B) and optionally a predetermined amount of an acid end capping agent (C) based on 100 parts by mass of the polyester elastomer (A), and has an acid value of 10 eq/ton or less.

The invention provides polymer compositions, compounds, processes, and methods of use of the polymers for drug delivery, biodegradable consumer plastics, or solvents for Li-based batteries or supercapacitors. The invention is based, at least in part, on the discovery that poly(glyceric acid carbonate)s and alkyl functionalized poly(1,2 glycerol carbonates) and poly(glyceric acid carbonate)s and pharmaceutical agent/composition functionalized poly(1,2 glycerol carbonates) and poly(glyceric acid carbonate)s represent a new type of glycerol based polymer that 1) degrade into glycerol and carbon dioxide; 2) the poly(1,2 glycerol carbonates) degrade more readily than conventional poly(1,3 glycerol carbonates; and 3) poly(1,2 glycerol carbonates) can be processed to give melts, viscous fluids, liquids, films, sheets, gels, meshes, foams, fibers, or particles.

A polycarbonate resin comprising a structural unit represented by the following formula (1), wherein weight-average molecular weight Mw measured by size-exclusion chromatography using polymethyl methacrylate as a standard sample is 50,000 or larger and 500,000 or smaller:

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Disclosed herein is a polyhydroxy ketal adduct obtained by the esterification of a hydrocarbon polyol by at least 1.5 equivalents of a ketocarboxy to produce an intermediate ketocarboxylic ester. The intermediate polyketocarboxylic ester is then ketalized to produce the polyhydroxyketal adduct, which can be used to provide a polymeric composition.

Disclosed herein are embodiments of a method for making recyclable polymers and a method for decomposing the polymers back to the monomers which can then be reused. The polymer are stable to aqueous and/or acid conditions and may have a formula II ##STR00001## The method to decompose the polymer back to the monomers may comprise heating the polymer in a protic organic solvent.

A two-component, solvent-based polyurethane adhesive composition based on a crystalline polyester-polycarbonate for producing an adhesive laminate structure including: (a) at least one isocyanate component; and (b) at least one isocyanate-reactive component comprising at least one crystalline polyester-polycarbonate compound; and a process for preparing the adhesive composition.

An organic zinc catalyst and a preparation method thereof are provided. According to the present invention, the organic zinc catalyst has a smaller thickness and a larger surface area to exhibit more improved activity in polymerization for the preparation of a poly(alkylene carbonate) resin.