Abstract:
This invention relates to a nest box (1) for bumblebees that provides sufficient ventilation inside the nest box (1). The provided nest box (1) with a bumblebees hive (2) inside resolves the problems of insufficient ventilation, by being mounted with a ventilation panel (14), comprising ventilation holes (13) in size(s) that enable ventilation but at the same time bumblebees from passing through.
Abstract:
Heat-expanded microspheres having high packing efficiency are produced by expanding heat-expandable microspheres, which include a shell of thermoplastic resin and a blowing agent encapsulated therein having a boiling point not higher than the softening point of the thermoplastic resin and have an average particle size from 1 to 100 micrometer, at a temperature not lower than their expansion initiating temperature, and the heat-expanded microspheres result in a void fraction not higher than 0.70.
Abstract:
An epoxy resin composition comprising(A) at least one epoxy resin comprising (a) a naphthalene ring-containing epoxy resin having at least one substituted or unsubstituted naphthalene ring in a molecule and having an epoxy equivalent of 175 to 210,(B) a phenolic resin having at least one substituted or unsubstituted naphthalene ring in a molecule, and(C) an inorganic filler,the substituted or unsubstituted naphthalene ring of the epoxy resin (a) being contained in an amount of 45 to 60% by weight in the total amount of the epoxy resin (A) is best suited for semiconductor encapsulation because it has good flow, a low coefficient of linear expansion, a high Tg, minimal moisture absorption, and crack resistance upon lead-free soldering.
Abstract:
In heat-expandable microspheres as a starting material for hollow fine particles, which have excellent performances required for giving not only a durability in steady running region but also a durability in high-speed running region to a tire-rim assembly, and each consisting of an outer shell made of a thermoplastic resin obtained by polymerizing a monomer component in the presence of a polymerization initiator, and a foaming agent encapsulated in the outer shell and having a boiling point not higher than a softening point of the thermoplastic resin, the polymerization initiator comprises a peroxydicarbonate as an essential component, and the foaming agent comprises a fluorine-containing compound having an ether structure and a carbon number of 2-10 and containing no chlorine atom and bromine atom.
Abstract:
Engine cooling structure directs cooling air, introduced into a case by operation of a fan, to a cylinder block of an engine and then discharges the cooling air out of the case through an outlet port along meandering flow passages. Case cooling structure directs cooling along the inner surface of the case. Further cooling flow passage directs the air to vertically-oriented heat radiating fins so that the cooling air flows upward along the fins and then is discharged through the outlet port. Metal cooling-fan cover is supported by the lower cover via mounting members, and a resin-made cover guide is fastened to the engine together with supporting portions and interposed between the fan cover and the engine.
Abstract:
The present invention provides heat-expanded microspheres having high packing efficiency, and a production method thereof. The heat-expanded microspheres are produced by expanding heat-expandable microspheres, which comprise shell of thermoplastic resin and a blowing agent encapsulated therein having a boiling point not higher than the softening point of the thermoplastic resin and have an average particle size from 1 to 100 micrometer, at a temperature not lower than their expansion initiating temperature, and the heat-expanded microspheres result in a void fraction not higher than 0.70.
Abstract:
A thermosetting epoxy resin composition is provided comprising (A) a reaction product obtained through reaction of a triazine derived epoxy resin with an acid anhydride, (C) a reflective agent, (D) an inorganic filler, and (E) a curing catalyst. In one embodiment, (B) an internal parting agent having a melting point of 50-90° C. is included. In another embodiment, (I) inorganic whisker fibers having an average fineness of 0.05-50 μm and an average length of 1.0-1,000 μm are included.
Abstract:
Epoxy resin compositions comprising (A) an epoxy resin having an epoxy equivalent of at least 185 and possessing a structure in which two benzene rings can be directly conjugated, carbon atoms having an sp2 type atomic orbital accounting for at least 50% of all the carbon atoms, (B) a &bgr;-naphthol type phenolic resin curing agent, (C) a curing accelerator, and (D) an inorganic filler cure into products having satisfactory solder crack resistance on use of lead-free solder and improved flame retardance despite the absence of halogenated epoxy resins and antimony compounds and are thus suited for semiconductor encapsulation.
Abstract:
A flame retardant epoxy resin composition suitable for semiconductor encapsulation contains (A) a crystalline epoxy resin whose 30 wt % m-cresol solution has a viscosity of lower than 80 centipoise at 25° C., (B) a curing agent having at least two phenolic hydroxyl groups, and (C) silica. The composition optionally contains (D) an organopolysiloxane, (E) an organic phosphine oxide, (F) an amide group-containing release agent, and/or (G) a silane coupling agent. The cured composition achieves flame retardance rating UL-94 V-0 without a need for flame retardants and remains stable at high temperature.
Abstract:
An epoxy resin composition comprising (A) a biphenyl skeleton-bearing epoxy resin, (B) a biphenyl skeleton-bearing phenolic resin as a curing agent, (C) an organosiloxane containing phenyl and organooxy groups, and (D) an inorganic filler is suited for semiconductor encapsulation since it is effectively moldable and cures into a part having improved reflow crack resistance, moisture resistance, and flame retardance. It does not pose a hazard to human health or the environment.