Abstract: This invention provides an electroconductive particle placement sheet comprising electroconductive particles and an insulating resin sheet. The thickness of the insulating resin sheet is smaller than the average particle diameter of the electroconductive particles. Electroconductive particles are protruded from the reference plane (P1) on at least one side of the insulating resin sheet. The electroconductive particle in is part protruded from the reference plane (P1) is covered with a layer formed of the same resin as in the insulating resin sheet.

Abstract: A curable composition for sealing a light emitting device, comprising a modified polysiloxane containing, in a molecule, not less than one alicyclic hydrocarbon group and not less than two epoxy groups.

Abstract: An amine hardener for epoxy resins which comprises an amine adduct (A) and a low-molecular amine compound (B) as major components, wherein the molecular weight distribution of the amine adduct (A), which is defined by the ratio of the weight-average molecular weight to the number-average molecular weight, is 3 or lower and the low-molecular amine compound (B) is contained in an amount of 0.001 to 1 part by mass per 100 parts by mass of the amine adduct (A).

Abstract: This invention provides an electroconductive particle placement sheet comprising electroconductive particles and an insulating resin sheet. The thickness of the insulating resin sheet is smaller than the average particle diameter of the electroconductive particles. Electroconductive particles are protruded from the reference plane (P1) on at least one side of the insulating resin sheet. The electroconductive particle in is part protruded from the reference plane (P1) is covered with a layer formed of the same resin as in the insulating resin sheet.

Abstract: An amine hardener for epoxy resins which comprises an amine adduct (A) and a low-molecular amine compound (B) as major components, wherein the molecular weight distribution of the amine adduct (A), which is defined by the ratio of the weight-average molecular weight to the number-average molecular weight, is 3 or lower and the low-molecular amine compound (B) is contained in an amount of 0.001 to 1 part by mass per 100 parts by mass of the amine adduct (A).

Abstract: A latent curing agent for an epoxy resin containing a curing agent (A) for an epoxy resin and a resin coating said curing agent (A) for an epoxy resin, wherein the resin coating said curing agent (A) for an epoxy resin comprises a structure in which two of the structure (structure (1)) are bonded via a urea bonding, the structure (1) being obtained by bonding three sulfur atoms at a branching point via a linear or cyclic aliphatic hydrocarbon group optionally containing an ester structure, wherein at least one of nitrogen atoms of each structure (1) is incorporated into said urea bonding; and a one component epoxy resin composition using the latent curing agent. The above one component epoxy resin composition which can exhibit high curability and storage stability in combination.

Abstract: A capsule type curing agent which comprises a core containing an amine type curing agent (A) and a capsule and a membrane covering said core, wherein said capsule membrane has a bonding group (x) absorbing infrared ray of a wave-number of 1630 to 1680 cm?1 and/or a bonding group (y) absorbing infrared ray of a wave-number of 1680 to 1725 cm?1, and contains cured material of an epoxy resin by the amine type curing agent (A) as a curing agent, and weight ratio of the core and the capsule membrane is 100:1 to 100:100.

Abstract: A curable composition for sealing a light emitting device, comprising a modified polysiloxane containing, in a molecule, not less than one alicyclic hydrocarbon group and not less than two epoxy groups.

Abstract: Disclosed is a novel blocked polyisocyanate obtained by blocking the terminal isocyanate groups of a non-blocked polyisocyanate with a thermally dissociative blocking agent, wherein the non-blocked polyisocyanate is obtained by reacting at least one diisocyanate selected from the group consisting of an aliphatic diisocyanate and an alicyclic diisocyanate with a polyhydroxy compound having an average number of hydroxyl groups as many as 4.5 to 10, and removing substantially all unreacted diisocyanate monomers. A coating composition comprising the blocked polyisocyanate of the present invention as a curing agent and a polyol as a main agent not only has excellent curability even under low temperature conditions, but is also capable of forming a coating which has excellent impact resistance.

Abstract: Disclosed is a blocked polyisocyanate composition comprising: a blocked polyisocyanate obtained by blocking the terminal isocyanate groups of a two or more terminal isocyanate groups-containing polyisocyanate derived from at least one diisocyanate selected from an aliphatic diisocyanate and an alicyclic diisocyanate with a blocking agent comprising at least one active methylene compound selected from a malonic diester and an acetoacetic ester; and a salt of a basic compound with an acidic compound, or a mixture of the salt with the basic compound or the acidic compound, the composition having a pH value of from 1 to 8.5. The blocked polyisocyanate composition of the present invention not only exhibits high stability even under high temperature conditions, but also is capable of maintaining such high stability for a prolonged period of time.

Abstract: A thermally dissociative blocked polyisocyanate, wherein an isocyanate group of the polyisocyanate is protected with a thermally dissociative blocking agent, which polyisocyanate is a urethane-modified isocyanurate polyisocyanate,(1) that is obtained by a cyclic-trimerization of at least one aliphatic or alicyclic diisocyanate either after its reaction with or in the presence of a polyhydric alcohol having a valence of at least 3,(2) of which the average number of isocyanate functional groups in said polyisocyanate is in the range of 4.5 to 10, and(3) the viscosity of which measured at 25.degree. C. substantially in the absence of the aliphatic or alicyclic diisocyanate monomer and a solvent thereof is in the range of 5,000 to 100,000 mPa.multidot.s;a thermosetting hardener composition; anda thermosetting one-pack coating composition comprising the blocked polyisocyanate.