Provided are a (meth)acrylic block copolymer exhibiting good active energy ray curability, in particular, curability of a blend thereof with an acrylate monomer, and an active energy ray curable composition comprising the (meth)acrylic block copolymer. The (meth)acrylic block copolymer includes a methacrylic polymer block (A) having an active energy ray curable group including a partial structure represented by the general formula (1) below wherein R.sup.1 denotes a hydrocarbon group having 1 to 10 carbon atoms, and W denotes a saturated hydrocarbon group having 1 to 10 carbon atoms, and an acrylic polymer block (B) having no active energy ray curable groups. ##STR00001##

A graft copolymer including zwitterionic repeat units and hydrophobic repeat units, in which the zwitterionic repeat units constitute 2-60 wt % of the graft copolymer and each of the hydrophobic repeat units is characterized in that a homopolymer formed thereof is miscible with polyvinylidene fluoride, polysulfone, poly ether sulfone, polyvinyl chloride, or polyacrylonitrile, each of the hydrophobic repeat units not being a repeat unit of polyvinylidene fluoride. Also disclosed is a filtration membrane containing such a graft copolymer or a statistical copolymer that includes the same composition of repeat units as the graft copolymer. Further disclosed are methods of preparing the graft copolymer and the filtration membrane.

A graft copolymer including zwitterionic repeat units and hydrophobic repeat units, in which the zwitterionic repeat units constitute 2-60 wt % of the graft copolymer and each of the hydrophobic repeat units is characterized in that a homopolymer formed thereof is miscible with polyvinylidene fluoride, polysulfone, poly ether sulfone, polyvinyl chloride, or polyacrylonitrile, each of the hydrophobic repeat units not being a repeat unit of polyvinylidene fluoride. Also disclosed is a filtration membrane containing such a graft copolymer or a statistical copolymer that includes the same composition of repeat units as the graft copolymer. Further disclosed are methods of preparing the graft copolymer and the filtration membrane.

The block copolymer intermediate represented by the following general formula (1) or (2) is used. In the formulae, R.sup.1 and R.sup.7 each independently represent a polymerization initiator residue, R.sup.2 and R.sup.8 each independently represent an aromatic group or an alkyl group, Y.sup.1 represents a polymer block of (meth)acrylic ester: Y.sup.2 represents a polymer block of styrene or a derivative thereof, and m and n each independently represent in an integer from 1 to 5. In the formulae, R.sup.3 represents an alkylene group having 1 to 6 carbon atoms, L represents a linking group, R.sup.4 represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an aromatic group, and R.sup.5 and R.sup.6 each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

##STR00001##

The block copolymer intermediate represented by the following general formula (1) or (2) is used. In the formulae, R.sup.1 and R.sup.7 each independently represent a polymerization initiator residue, R.sup.2 and R.sup.8 each independently represent an aromatic group or an alkyl group, Y.sup.1 represents a polymer block of (meth)acrylic ester: Y.sup.2 represents a polymer block of styrene or a derivative thereof, and m and n each independently represent in an integer from 1 to 5. In the formulae, R.sup.3 represents an alkylene group having 1 to 6 carbon atoms, L represents a linking group, R.sup.4 represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an aromatic group, and R.sup.5 and R.sup.6 each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

##STR00001##

The present invention relates to thermally and chemically stable quantum dots encapsulated with functional polymeric ligands, a thermally stable quantum dot optical film using the encapsulated quantum dots, and a method for preparing the encapsulated quantum dots. The coating of the surface of the quantum dots with the polymer stabilizes the quantum dots and improves the durability and dispersibility of the quantum dot optical film, achieving markedly improved efficiency of photoluminescent quantum dot devices. Therefore, it is anticipated that the present invention will pave the way for practical use of quantum dots in a variety of light-emitting applications, particularly in high power light-emitting sources, to find commercial application in various fields, including displays, bioimaging, lightings, and photovoltaic cells.

Butadiene-isoprene diblock copolymer formed by a block of crystalline polybutadiene (hard block) and by a block of amorphous polyisoprene (soft block). Said butadiene-isoprene diblock copolymer can be advantageously used both in the footwear industry (for example, in the production of shoe soles), and in the production of tires for motor vehicles and/or trucks.

A polyolefin-polystyrene-based multiblock copolymer and method of making the same are disclosed herein. In some embodiments, a polyolefin-polystyrene-based multiblock copolymer satisfies conditions (a) a weight average molecular weight is 100,000 to 300,000 g/mol; (b) molecular weight distribution is 1.5 to 3.0; (c) measured results of gel permeation chromatography, a graph having an x-axis of log Mw and a y-axis of dw/dlog Mw, are fit to a Gaussian function, where all constants satisfy −0.01<A<0.03, 4.8<B<5.2, 0.8<C<1.2, and 0.6<D<1.2; and (d) a polyolefin block comprises one or more branch points, where a carbon atom at the branch point is represented by a peak of 36 to 40 ppm, and a terminal carbon atom of a branched chain from the branch point is represented by a peak of 13 to 15 ppm.

A polyolefin-polystyrene-based multiblock copolymer and method of making the same are disclosed herein. In some embodiments, a polyolefin-polystyrene-based multiblock copolymer satisfies conditions (a) a weight average molecular weight is 100,000 to 300,000 g/mol; (b) molecular weight distribution is 1.5 to 3.0; (c) measured results of gel permeation chromatography, a graph having an x-axis of log Mw and a y-axis of dw/dlog Mw, are fit to a Gaussian function, where all constants satisfy −0.01<A<0.03, 4.8<B<5.2, 0.8<C<1.2, and 0.6<D<1.2; and (d) a polyolefin block comprises one or more branch points, where a carbon atom at the branch point is represented by a peak of 36 to 40 ppm, and a terminal carbon atom of a branched chain from the branch point is represented by a peak of 13 to 15 ppm.

A composition for forming a phase-separated structure contains a block copolymer having a block (b1) consisting of a repeating structure of a styrene unit and a block (b2) consisting of a repeating structure of a methyl methacrylate unit, in which the block (b2) is disposed at least at one terminal portion of the block copolymer, the block copolymer has a structure (e1) represented by General Formula (e1) at least at one main chain terminal, and the structure (e1) is bonded to the main chain terminal of the block (b2) disposed at a terminal portion of the block copolymer. Re.sup.e0 represents a hydrocarbon group containing a hetero atom, and Re1 represents a hydrogen atom or a halogen atom. ##STR00001##