A phase difference film and a circularly polarizing film each achieve suppressed coloration when viewed from the front direction, a smaller difference in tint between views from the front direction and the oblique direction, and suppressed image unevenness, where the film is applied to an image display panel, in particular, an organic EL panel; as well as an image display device including the circularly polarizing film. The phase difference film includes optically anisotropic layers A and B, in which a retardation RthA of layer A in the thickness direction at a wavelength of 550 nm is larger than 0, layer A exhibits predetermined optical properties, a retardation RthB of layer B in the thickness direction at a wavelength of 550 nm is smaller than 0, layer B satisfies predetermined optical properties, and the angle formed between a slow axis of the optically anisotropic layers A and B is 90°±10°.

A method to prepare an oligomer which includes a plurality of pendent alkenyl groups, where the method reacts a copolymer formed by copolymerizing styrene and allyl alcohol comprising a polyhydroxy oligomer wherein n is between about 3 and about 50, and having a structure:

##STR00001##

with an isocyanate having a structure:

##STR00002##

to give a urethane-modified copolymer having a structure:

##STR00003##

A copolymerized polycarbonate resin having, at least, a constituent unit (A) and a constituent unit (B). The constituent unit (A) is derived from a dihydroxy compound. The carbonate constituent unit (B) is derived from a polyoxyalkylene glycol. A weight ratio of the constituent unit (B) derived from a polyoxyalkylene glycol to a weight of the copolymerized polycarbonate resin is preferably more than 20 wt % and 99 wt % or less.

A polycarbonate diol composition comprising polycarbonate diol having a structure represented by the following general formula (I) and a polycarbonate structure represented by the following general formula (II), wherein melt viscosity at 50° C. is 1000 to 10000 mPa.Math.s, and an average value of the number of repeats represented by n11 in the following general formula (I) is 12 or larger:

##STR00001##

The present application provides a polycarbonate resin including structural units (A) represented by general formula (1) and structural units (B) represented by general formula (4).

##STR00001##

(In general formula (1), R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, and R.sub.8 each independently represents a hydrogen atom, etc., and X represents —O—, etc.)

##STR00002##

(In general formula (4), R.sub.z and R.sub.x each independently represents a hydrogen atom or a C1-3 alkyl group, i represents an integer 3-10 and p represents an integer 5-600.)

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.

A (poly)ol block copolymer of general structure B-A-(B)n, wherein block A is a polycarbonate block or polyester block, n=t−1 and t=the number of reactive end residues on block A, wherein block B is a polyethercarbonate block and wherein >70% of the copolymer chain ends are terminated by primary hydroxyl groups, and a process of producing such copolymers and products incorporating such copolymers.

The present invention relates to a method for preparing polyether carbonate polyols by adding alkylene oxide and carbon dioxide to a H-functional starter substance in the presence of a DMC catalyst or a metal complex catalyst based on the metals cobalt and/or zinc, wherein (γ) alkylene oxide and carbon dioxide are added to a H-functional starter substance in a reactor in the presence of a DMC catalyst or a metal complex catalyst based on the metals cobalt and/or zinc, characterized in that the alkylene oxide contains a proportion of 5 to 50 wt. % ethylene oxide, based on the overall weight of the alkylene oxide used, and the addition of the ethylene oxide is carried out in an atmosphere containing carbon dioxide.

The subject matter of this invention relates to hydrogel compositions and, more particularly, to hydrogel compositions comprising block copolymers (BCPs) capable of self-assembly into nanoparticles for the delivery and controlled release of therapeutic cargos.

The present disclosure relates to block copolymers comprising, and methods of making thereof, a polycarbonate chain linked to a hydrophilic polymer. Such block copolymers may have the formula B-A-B, where A is a polycarbonate or polyethercarbonate chain and B is a polyether. Provided methods are useful in reducing the amount of waste generated from the synthesis of polycarbonates and provide improved thermal stability and high primary hydroxyl content. Provided block copolymers also have utility as additives in enhanced oil recovery methods, and foam polymer applications.