Techniques regarding post polymerization modifications to polycarbonate polymers via a flow reactor are provided. For example, one or more embodiments described herein can comprise a cyclic carbonate monomer that can be employed to facilitate polymerization of one or more polycarbonate platforms susceptible to post polymerization modification. For instance, one or more embodiments can regard a cyclic carbonate molecular backbone covalently bonded to an aryl halide functional group via in accordance with a chemical structure selected from the group consisting of: ##STR00001##
In the chemical structures, “R.sub.1” can be selected from the group consisting of a hydrogen atom and a functional group comprising a first alkyl group; “L” can represent a linkage group, comprising: a second alkyl group and an end group having at least one member selected from the group consisting of an oxygen atom and a nitrogen atom; and “A” can represent the aryl halide functional group.

The present disclosure relates to degradable polymers which contain a hydrophobic and hydrophilic segment which is sensitive to pH. In some aspects, the polymers form a micelle which is sensitive to pH and have backbones which are capable of undergoing degradation in vivo. In some aspects, the disclosure also provides methods of using these degradable polymers for the delivery of a drug.

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##

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.

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 of Chemical Formula 1: ##STR00001## wherein in Chemical Formula 1: Ar is C.sub.6-60 arylene unsubstituted or substituted with C.sub.1-10 alkyl; and n and m are each independently an integer from 1 to 50, provided that n+m is 2 or more, and a preparation method thereof.

The present application provides: a polycarbonate resin which has heat resistance and is able to be produced using a starting material that is derived from natural products; and a monomer compound which enables the achievement of this resin. A polycarbonate resin which includes a constituent unit represented by general formula (1); a monomer compound which enables the achievement of this resin; and a polycarbonate resin which includes a constituent unit represented by general formula (1) and a constituent unit represented by general formula (2).

##STR00001##

The present invention relates to novel high-value polycarbonate polyols, to processes for the production thereof, to polyisocyanate prepolymers obtainable therefrom and also polyurethane (PUR) and polyurethane urea elastomers which under particularly demanding applications show unique combinations of processing characteristics, hydrolysis and oxidation stability, mechanical and dynamic mechanical properties.

Techniques regarding post polymerization modifications to polycarbonate polymers via a flow reactor are provided. For example, one or more embodiments described herein can comprise a cyclic carbonate monomer that can be employed to facilitate polymerization of one or more polycarbonate platforms susceptible to post polymerization modification. For instance, one or more embodiments can regard a cyclic carbonate molecular backbone covalently bonded to an aryl halide functional group via in accordance with a chemical structure selected from the group consisting of:

##STR00001##

In the chemical structures, “R.sub.1” can be selected from the group consisting of a hydrogen atom and a functional group comprising a first alkyl group; “L” can represent a linkage group, comprising: a second alkyl group and an end group having at least one member selected from the group consisting of an oxygen atom and a nitrogen atom; and “A” can represent the aryl halide functional group.

Techniques regarding post polymerization modifications to polycarbonate polymers via a flow reactor are provided. For example, one or more embodiments described herein can comprise a cyclic carbonate monomer that can be employed to facilitate polymerization of one or more polycarbonate platforms susceptible to post polymerization modification. For instance, one or more embodiments can regard a cyclic carbonate molecular backbone covalently bonded to an aryl halide functional group via in accordance with a chemical structure selected from the group consisting of:

##STR00001##

In the chemical structures, “R.sub.1” can be selected from the group consisting of a hydrogen atom and a functional group comprising a first alkyl group; “L” can represent a linkage group, comprising: a second alkyl group and an end group having at least one member selected from the group consisting of an oxygen atom and a nitrogen atom; and “A” can represent the aryl halide functional group.