[Problem] An object of the present invention is to provide an epoxy resin modifier capable of imparting excellent fracture toughness and peel adhesion strength while maintaining high transparency when added into an epoxy resin to form a cured product, an epoxy resin composition containing the epoxy resin modifier, an adhesive and an underfill material composed of the epoxy resin composition, and a cured product obtained by curing the epoxy resin composition.

[Solution] The epoxy resin modifier according to the present invention contains an A-B-A triblock copolymer having an A block that has a structural unit (a-1) represented by the general formula (1) and a structural unit (a-2) derived from a (meth)acrylate having a chain alkyl group, and a B block that has a structural unit (b) derived from a (meth)acrylate having a chain alkyl group or a cyclic alkyl group, an amount of the structural unit (a-1) is 85 mass % or more and less than 100 mass % in 100 mass % of each A block, and an amount of the structural unit (a-2) is more than 0 mass % and 15 mass % or less in 100 mass % of each A block.

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[In the general formula (1), R.sup.1 is a hydrogen atom or a methyl group, 0?n?10, and Q is a four-membered to six-membered cyclic ether group or cyclic thioether group.]

The present application provides the block copolymers and their application. The block copolymer has an excellent self assembling property and phase separation and various required functions can be freely applied thereto as necessary.

Compounds and compositions are provided which are useful in additive printing, particularly additive printing techniques such as stereolithography (SLA) wherein a macromer is photopolymerized to form a manufactured article. Representative compounds comprise a polyaxial central core (CC) and 2-4 arms of the formula (A)-(B) or (B)-(A) extending from the central core, where at least one of the arms comprise a light-reactive functional group (Q) and (A) is the free-radical polymerization product from monomers selected from trimethylene carbonate (T) and ?-caprolactone (C), while (B) is the free-radical polymerization product from monomers selected from glycolide, lactide and ?-dioxanone.

Compounds and compositions are provided which are useful in additive printing, particularly additive printing techniques such as stereolithography (SLA) wherein a macromer is photopolymerized to form a manufactured article. Representative compounds comprise a polyaxial central core (CC) and 2-4 arms of the formula (A)-(B) or (B)-(A) extending from the central core, where at least one of the arms comprise a light-reactive functional group (Q) and (A) is the free-radical polymerization product from monomers selected from trimethylene carbonate (T) and ?-caprolactone (C), while (B) is the free-radical polymerization product from monomers selected from glycolide, lactide and ?-dioxanone.

The present disclosure relates to an acrylic processing aid and a vinyl chloride resin composition including the same, and in particular, to a core-shell-structured acrylic processing aid preparing a core using a silicone-azo macroinitiator and preparing a shell using C12 to C18 alkyl methacrylate as a co-monomer, and a vinyl chloride resin composition including the same. The acrylic processing aid is used for sheet forming of the vinyl chloride resin, and facilitates manufacture of a high-quality vinyl chloride resin formed article having excellent transparency, adhesion resistance and heat stability, having no non-dispersed melt (fish-eye) production, and having significantly reduced air mark and flow mark occurrences.

Provided is a resin composition, comprising: an isobutylene-based copolymer (A) containing a halogen atom; an ethylene-vinyl alcohol copolymer (B); and a halogen scavenger (C), wherein a mass ratio (B/A) of the ethylene-vinyl alcohol copolymer (B) to the isobutylene-based copolymer (A) containing a halogen atom is from 20/80 to 50/50, and a content of the halogen scavenger (C) is from 0.01 to 1 part by mass based on 100 parts by mass of a total of the isobutylene-based copolymer (A) containing a halogen atom and the ethylene-vinyl alcohol copolymer (B). Such a resin composition is excellent in gas barrier properties and flexibility and stably produced over a long period of time.

Provided is a resin composition, comprising: an isobutylene-based copolymer (A) containing a halogen atom; an ethylene-vinyl alcohol copolymer (B); and a halogen scavenger (C), wherein a mass ratio (B/A) of the ethylene-vinyl alcohol copolymer (B) to the isobutylene-based copolymer (A) containing a halogen atom is from 20/80 to 50/50, and a content of the halogen scavenger (C) is from 0.01 to 1 part by mass based on 100 parts by mass of a total of the isobutylene-based copolymer (A) containing a halogen atom and the ethylene-vinyl alcohol copolymer (B). Such a resin composition is excellent in gas barrier properties and flexibility and stably produced over a long period of time.

Provided is a multi-component copolymer comprising conjugated diene units, non-conjugated olefin units and aromatic vinyl units, wherein: a peak top molecular weight of chain parts, divided by the conjugated diene units and each containing one or more of the non-conjugated olefin units and/or one or more of the aromatic vinyl units, is 1,000 or more and less than 40,000. A rubber composition comprising the multi-component copolymer, a crosslinked rubber composition, and a rubber article comprising the crosslinked rubber composition are also provided.

A method for the preparation of block copolymers including at least one high vinyl segment, the method comprising (i) charging into a reactor a diene monomer in a hydrocarbon solvent, a catalytically effective amount of anionic initiator, and an oligomeric oxolanyl propane, whereby the reactor is optionally cooled; (ii) allowing the diene monomer to polymerize at a peak polymerization temperature of at least about 18 C. and less than about 60 C. to form a first block where the vinyl content is at least about 50 percent by weight; (iii) after step (ii), charging into the reactor a vinyl aromatic monomer, whereby the reactor is optionally heated to a temperature up to about 60 C.; (iv) allowing the vinyl aromatic monomer to polymerize to form a second block; and (v) optionally charging into the reactor a quenching agent.

A method for the preparation of block copolymers including at least one high vinyl segment, the method comprising (i) charging into a reactor a diene monomer in a hydrocarbon solvent, a catalytically effective amount of anionic initiator, and an oligomeric oxolanyl propane, whereby the reactor is optionally cooled; (ii) allowing the diene monomer to polymerize at a peak polymerization temperature of at least about 18 C. and less than about 60 C. to form a first block where the vinyl content is at least about 50 percent by weight; (iii) after step (ii), charging into the reactor a vinyl aromatic monomer, whereby the reactor is optionally heated to a temperature up to about 60 C.; (iv) allowing the vinyl aromatic monomer to polymerize to form a second block; and (v) optionally charging into the reactor a quenching agent.