A crosslinking agent composition for water-compatible resins which comprises a hydrophobic crosslinking agent, a water-soluble organic compound, one or more oily media selected from among hydrocarbon-based solvents and ketone-based solvents having a solubility parameter of 9.0 (cal/cm.sup.−3).sup.1/2 or less, and an aqueous medium. The crosslinking agent composition can improve the storage stability of a water-compatible resin composition. The water-compatible resin composition which contains this crosslinking agent composition can give cured objects satisfactory in terms of water resistance and solvent resistance and is suitable also for use in wet-on-wet coating.

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##

The present invention relates to a microballoon. The microballoon is made of polyurethane (urea). The microballoon is characterized in that an inner surface of the microballoon contains ionic groups. According to the present invention, through use for a CMP polishing pad, affinity with a slurry liquid for polishing is improved, and thus it is possible to provide a microballoon by which good polishing characteristics may be exhibited without lowering the resin strength of a polishing pad.

The present invention is to provide a urethane adhesive composition which exhibits excellent heat-resistant adhesion after storage to resin. The present invention relates to a urethane adhesive composition including: a urethane prepolymer having an isocyanate group; an isocyanurate compound having an isocyanurate ring; a terpene compound having active hydrogen; and a vinyl silane coupling agent represented by Formula (A) below: (where in Formula (A), R.sup.1 and R.sup.3 each independently represent a monovalent hydrocarbon group, R.sup.2 represents a (n+1) valent hydrocarbon group, Vi represents —CH═CH.sub.2, m1 is from 1 to 3, m2 is from 1 to 3, m3 is from 0 to 2, m1+m2+m3 is 4, and n is 1 or greater). ##STR00001##

The present invention is to provide a urethane adhesive composition which exhibits excellent heat-resistant adhesion after storage to resin. The present invention relates to a urethane adhesive composition including: a urethane prepolymer having an isocyanate group; an isocyanurate compound having an isocyanurate ring; a terpene compound having active hydrogen; and a vinyl silane coupling agent represented by Formula (A) below: (where in Formula (A), R.sup.1 and R.sup.3 each independently represent a monovalent hydrocarbon group, R.sup.2 represents a (n+1) valent hydrocarbon group, Vi represents —CH═CH.sub.2, m1 is from 1 to 3, m2 is from 1 to 3, m3 is from 0 to 2, m1+m2+m3 is 4, and n is 1 or greater). ##STR00001##

Provided is a three-dimensional object producing method that includes applying an object forming liquid to powder including a base material and an organic material to form a solidified product, and removing the powder deposited on the solidified product from the solidified product using a powder removal liquid including an organic solvent. The following formulae are satisfied

RED of non-forming part<1.20 and

RED of forming part>0.55.

The forming part is a portion of the powder to which the object forming liquid is applied and RED of the forming part is a distance between HSP of the forming part and HSP of the organic solvent. The non-forming part is a portion of the powder to which the object forming liquid is not applied and RED of the non-forming part is a distance between HSP of the non-forming part and HSP of the organic solvent.

According to an embodiment of the present invention, provided are hollow particles which have a wall portion containing polyurethane or polyurea, have an internal porous structure, and have a plurality of opening spaces blocked by the wall portion in an outermost portion of the porous structure, and a manufacturing method thereof, and a pore forming material, particles for cosmetics, and a weight reducing material.

The present invention provides an optically clear adhesive sheet having excellent environment resistance using a heat-curable polyurethane composition that has excellent flexibility and is capable of giving a thick film. The optically clear adhesive sheet of the present invention is formed of: a cured product of a heat-curable polyurethane composition, the heat-curable polyurethane composition containing a polyol component, a polyisocyanate component, and a tackifier, the polyol component having an olefin skeleton, the polyisocyanate component being a modified polyisocyanate that is obtained by reacting an acyclic aliphatic and/or alicyclic polyisocyanate containing an isocyanate group with an ether compound containing an ethylene oxide unit.

Core shell microcapsules are provided wherein the capsule shell is an interfacial copolymer formed of a gelatin and an isocyanate.

The present invention relates to an aqueous emulsion including an ethylenically unsaturated monomer unit-containing polymer as a dispersoid and a polyvinyl alcohol as a dispersant. The content of a free polyvinyl alcohol in the aqueous emulsion is 0.2 to 20 parts by mass relative to 100 parts by mass of the ethylenically unsaturated monomer unit-containing polymer. The free polyvinyl alcohol has a degree of saponification of 80.0 to 99.5 mol % and a viscosity-average degree of polymerization of 200 to 5000, and the free polyvinyl alcohol has a symmetry factor (W.sub.0.05h/2f) that satisfies the following expression (1) as determined by gradient high-performance liquid chromatography for reversed-phase separation using a water-acetone eluent according to JIS K 0124 (2011).

0.85≦W.sub.0.05h/2f≦1.30  (1)

(The definitions of the symbols are omitted.)