A biodegradable cationic polymer is disclosed, comprising first repeat units derived from a first cyclic carbonyl monomer by ring-opening polymerization, wherein more than 0% of the first repeat units comprise a side chain moiety comprising a quaternary amine group; a subunit derived from a monomeric diol initiator for the ring-opening polymerization; and an optional endcap group. The biodegradable cationic polymers have low cytotoxicity and form complexes with biologically active materials useful in gene therapeutics and drug delivery.

The present invention relates to a kind of organic metal-free catalysts containing both electrophilic and nucleophilic dual-functions, preparation methods of making the same, and uses thereof. The organic metal-free catalysts in the present invention have the chemical structure shown in formula (I): ##STR00001##
Compared with the metal-free organic polymerization catalytic systems that have been reported before, the organic metal-free catalysts in this invention have the combined advantages of simple preparation, high reactivity, easy operation, low cost, wide applicability, easy for industrial production.

The present invention relates to a kind of organic metal-free catalysts containing both electrophilic and nucleophilic dual-functions, preparation methods of making the same, and uses thereof. The organic metal-free catalysts in the present invention have the chemical structure shown in formula (I): ##STR00001##
Compared with the metal-free organic polymerization catalytic systems that have been reported before, the organic metal-free catalysts in this invention have the combined advantages of simple preparation, high reactivity, easy operation, low cost, wide applicability, easy for industrial production.

The present invention provides a polycarbonate-based resin composition, including: a polycarbonate-based resin (S) containing a polycarbonate-polyorganosiloxane copolymer (A), which contains a polycarbonate block (A-1) formed of a specific repeating unit and a polyorganosiloxane block (A-2) containing a specific repeating unit; and a copolymer (B) including a constituent unit (b-1) having a specific structure, a constituent unit (b-2) having a specific structure, and a constituent unit (b-3) having a specific structure.

The subject of the present invention is a process for the production of polysiloxane-polycarbonate block cocondensates, wherein A) at least one polycarbonate is reacted in the melt with B) at least one hydroxyaryl-terminated polysiloxane with use C) of an additive which is selected from at least one from the group consisting of a siloxane containing aromatic substituents (component C1) and a polysiloxane-polycarbonate block cocondensate A) or polysiloxane-polycarbonate block cocondensate, which can also be different from A) (component C2).

Provided are: a polycarbonate-based resin composition, including a polycarbonate-based resin (A) containing a polycarbonate-polyorganosiloxane copolymer (A1) having a predetermined structure, and 0.1 part by mass or more to 40 parts by mass or less of a white pigment (B) with respect to 100 parts by mass of the polycarbonate-based resin (A), wherein the white pigment (B) has an organic layer on a surface thereof, and a highest peak temperature of an evolved gas analysis curve of the organic layer obtained by evolved gas analysis with a pyrolysis gas chromatograph apparatus and a FID detector is 390° C. or more; and a molded article thereof.

Provided are: a polycarbonate-based resin composition, including a polycarbonate-based resin (A) containing a polycarbonate-polyorganosiloxane copolymer (A1) having a predetermined structure, and 0.1 part by mass or more to 40 parts by mass or less of a white pigment (B) with respect to 100 parts by mass of the polycarbonate-based resin (A), wherein the white pigment (B) has an organic layer on a surface thereof, and a highest peak temperature of an evolved gas analysis curve of the organic layer obtained by evolved gas analysis with a pyrolysis gas chromatograph apparatus and a FID detector is 390° C. or more; and a molded article thereof.

The subject disclosure is directed to functionalized bile acids, preparation thereof, and usage thereof for therapeutic and material applications. In one embodiment, a method of generating functionalized bile acid materials can comprise directly activating a carboxylic acid of a bile acid compound using a coupling agent comprising an amide or ester compound, thereby generating an intermediate bile acid derivative material. The method can further comprise attaching a functional group material to the intermediate bile acid derivative material by reacting the functional group material and the intermediate bile acid derivative material, thereby generating a functionalized bile acid material.

Polycarbonate-based compositions containing polyether carbonate polyol are described. The compositions have an elevated transmittance in the VIS range as a result of the additive and further advantageous properties, for instance improved demolding characteristics. Even small amounts have a significant impact.

To provide a transparent resin composition having excellent optical characteristics, particularly, excellent optical characteristics under high temperature and high humidity.

There is provided a transparent resin composition, including: an aromatic polycarbonate resin; and a water-insoluble organic sulfonic acid and/or a metal salt thereof, in which a content of the water-insoluble organic sulfonic acid and/or the metal salt thereof is 0.01 to 3.0 pts.Math.mass to 100 pts.Math.mass of the aromatic polycarbonate resin, and a dissolved amount of the water-insoluble organic sulfonic acid and/or the metal salt thereof is not more than 0.5 g to 100 g of pure water.