Abstract: The present invention provides a polyvinyl acetal powder which is excellent in flowability during the coating process when it is applied to a powder coating material. This polyvinyl acetal powder enables to obtain a coating film having good impact resistance and uniformity of thickness (uniformity of coating film thickness). The present invention also provides a powder coating material using the polyvinyl acetal powder. Specifically, the present invention is a polyvinyl acetal powder having an average particle diameter of 10 to 150 ?m, a maximum particle diameter of 250 ?m or less, and a melt flow rate of 1 to 200 g/10 min. as measured in accordance with JIS K7210: 1999. The present invention also is a powder coating material containing this polyvinyl acetal powder.

Abstract: The invention relates to the use of films containing plasticiser and based on polyvinyl acetal with a polyvinyl alcohol content in the polyvinyl acetal of less than 18% by weight and low creep tendency to produce photovoltaic modules.

Abstract: Disclosed is a porous powder of a crosslinkable polyvinyl acetal which is capable of forming a cured product having excellent solvent resistance by light irradiation, electron beam irradiation or heat treatment, while being excellent in cleanability and solubility in solvents. Specifically disclosed is a crosslinkable polyvinyl acetal porous powder which contains a crosslinkable polyvinyl acetal containing a monomer unit to which a crosslinkable functional group is bonded through at least one bond selected from an ester bond, an ether bond and a urethane bond, wherein the crosslinkable functional group content is 0.3-20% by mole relative to the total of —CH2—CH— units in the main chain of vinyl acetal. The crosslinkable polyvinyl acetal porous powder has an average particle diameter of 30-10,000 ?m and a bulk density of 0.12-0.50 g/mL.

Abstract: According to the present invention, a polyvinyl butyral resin pellet is provided that gives off little odor when produced and handled, as well as has a high apparent density and favorable handleability. The present invention includes a method for producing a polyvinyl butyral resin pellet including the steps of: melting polyvinyl butyral resin powder with a water content of 0.01 to 6 wt % by means of a melt extruder that has at least one vent portion for devolatilization equipped with vacuum means, and cutting the melt of the polyvinyl butyral resin after extrusion of it from the melt extruder. The present invention further includes a polyvinyl butyral resin pellet having a total content of butyl aldehyde and 2-ethyl-2-hexenal of 100 ppm or less.

Abstract: The present invention provides a polyvinyl acetal powder which is excellent in flowability during the coating process when it is applied to a powder coating material. This polyvinyl acetal powder enables to obtain a coating film having good impact resistance and uniformity of thickness (uniformity of coating film thickness). The present invention also provides a powder coating material using the polyvinyl acetal powder. Specifically, the present invention is a polyvinyl acetal powder having an average particle diameter of 10 to 150 ?m, a maximum particle diameter of 250 ?m or less, and a melt flow rate of 1 to 200 g/10 min. as measured in accordance with JIS K7210: 1999. The present invention also is a powder coating material containing this polyvinyl acetal powder.

Abstract: An aminoalcohol is synthesized by reacting a cyclic hemiacetal expressed by Formula 1 (where n is 0 or 1; R1 and R2 are each a hydrogen atom, a monovalent saturated hydrocarbon group which is optionally substituted, or a monovalent aromatic group which is optionally substituted, or R1 and R2 are bonded together into a divalent saturated hydrocarbon group which is optionally substituted; and R3, R4, and R5 are each a hydrogen atom, a monovalent saturated hydrocarbon group which is optionally substituted, or a monovalent aromatic group which is optionally substituted), with hydrogen and any one of ammonia, a primary amine and secondary amine in the presence of a hydrogenation catalyst.