Abstract: A tyrosinase activity inhibitor is prepared by combining (A) a metal (zinc, cobalt or iron) chelate compound of ?-lipoyl amino acid or its pharmaceutically acceptable salt with (B-1) a human manganese SOD or (B-2) an ascorbic acid compound such as ascorbic acid and ascorbyl glucoside. A ratio (R1) of the (B-1) component content to the (A) component content is preferably 0.001 to 1,500, when R1 is defined as R1=[Unit concentration of (B-1) component (unit/mL)/Concentration of (A) component (?g/mL)], and a ratio (R2) of the (A) component content to the (B-2) component content is preferably 0.0001 to 1,000, when R2 is defined as R2=[Concentration of (A) component (m/mL)/Concentration of (B-1) component (mg/mL)]. An external preparation for skin contains the (A) component and the (B-1) component or the (B-2) component as effective ingredients for inhibiting tyrosinase activity.

Abstract: A tyrosinase activity inhibitor is prepared by combining (A) a metal (zinc, cobalt or iron) chelate compound of ?-lipoyl amino acid or its pharmaceutically acceptable salt with (B-1) a human manganese SOD or (B-2) an ascorbic acid compound such as ascorbic acid and ascorbyl glucoside. A ratio (R1) of the (B-1) component content to the (A) component content is preferably 0.001 to 1,500, when R1 is defined as R1=[Unit concentration of (B-1) component (unit/mL)/Concentration of (A) component (?g/mL)], and a ratio (R2) of the (A) component content to the (B-2) component content is preferably 0.0001 to 1,000, when R2 is defined as R2=[Concentration of (A) component (m/mL)/Concentration of (B-1) component (mg/mL)]. An external preparation for skin contains the (A) component and the (B-1) component or the (B-2) component as effective ingredients for inhibiting tyrosinase activity.

Abstract: A transparent aqueous elastic body can be obtained, which is highly transparent, flexible, hardly fragile, and excellent in strength against strain. The transparent aqueous elastic body comprises at least one thickening agent selected from galactomannans, and a xanthan gum, in which water-insoluble components are decomposed or removed. The transparent aqueous elastic body has a transmissivity above 90% T measured using a spectrophotometer under a condition at a temperature of 25° C., with a measuring wavelength of 655 nm, in a measuring optical path of 10 mm.

Abstract: A transparent aqueous elastic body can be obtained, which is highly transparent, flexible, hardly fragile, and excellent in strength against strain. The transparent aqueous elastic body comprises at least one thickening agent selected from galactomannans, and a xanthan gum, in which water-insoluble components are decomposed or removed. The transparent aqueous elastic body has a transmissivity above 90% T measured using a spectrophotometer under a condition at a temperature of 25° C., with a measuring wavelength of 655 nm, in a measuring optical path of 10 mm.

Abstract: A box-shaped plastic housing of integrally molded resin comprises a flat-shaped bottom wall having a peripheral edge and an upright wall extending upwardly from the peripheral edge of the bottom wall. The bottom wall and the upright wall cooperatively define an integral box-shaped molded product. The thickness of the bottom wall is in the range of two-thirds to one-third with respect to the thickness of the upright wall. The bottom wall is provided with at least one rib on its inner surface. The housing is produced by an injection molding process using a mold having a mold cavity which is provided with a groove on the inner surface of the cavity corresponding to each rib.

Abstract: An electronic apparatus comprising a housing, and an electronic part accommodated in the housing, wherein the housing includes a metallic member and a resin member molded integrally with the metallic member, the metallic member forming an outside part of the housing and being treated on its outer surface for enhancing a coefficient of heat radiation.

Abstract: A polyamide resin composition including 100 parts by weight of a resin composition containing of 20 to 80% by weight of an aromatic polyamide resin and 80 to 20% by weight of a modified polyphenylene ether resin (the total amount in% by weight of the aromatic polyamide resin and the modified polyphenylene ether resin being 100% by weight) and, incorporated in the resin composition, 0.5 to 30 parts by weight of a liquid-crystalline polymer, 0.01 to 3 parts by weight of a compatibilizing agent and 2 to 40 parts by weight of an inorganic filler and optionally a rubber component. The plate thickness of the resin molded articles may be reduced to 2 mm or less, and even further to 1 mm or less without deterioration of the properties thereof.

Abstract: A polyamide resin composition including 100 parts by weight of a resin composition containing of 20 to 80% by weight of an aromatic polyamide resin and 80 to 20% by weight of a modified polyphenylene ether resin (the total amount in % by weight of the aromatic polyamide resin and the modified polyphenylene ether resin being 100% by weight) and, incorporated in the resin composition, 0.5 to 30 parts by weight of a liquid-crystalline polymer, 0.01 to 3 parts by weight of a compatibilizing agent and 2 to 40 parts by weight of an inorganic filler and optionally a rubber component. The plate thickness of the resin molded articles may be reduced to 2 mm or less, and even further to 1 mm or less without deterioration of the properties thereof.

Abstract: An injection molding process for producing an integrally molded box-shaped plastic housing of a resin material. The housing includes integral portions of a bottom wall of a first thickness and an upright wall of a second thickness, the first thickness being in the range of from one-third to two-thirds of the second thickness and the bottom wall portion including at least one integral rib structure. A cavity is formed in a mold having cavity portions, respectively corresponding to the bottom and upright wall portions and the rib structure, in fluid communication. Fluid resin is injected through respective injection gates directly communicating with the rib structure cavity portion and the upright wall cavity portion, which provide passageways for flow of the liquid resin therethrough, thereby completely filling all cavity portions.

Abstract: Flame retardation of 1,2-polybutadiene based upon the use of halogenated bisphenol bisacrylate reactive flame retardants, for example, 2,2-bis(4-methacryloyl-3,5-dibromophenyl)-propane. Flame retardancy performance of UL 94 V-0 or V-1 has been achieved without impairing desirable dielectric properties and heat resistance inherently possessed by 1,2-polybutadiene. If an aromatic bismaleimide modifier, for example, N,N'-4,4'-diphenylmethane bismaleimide, is jointly used, a thermal expansion coefficient less than a half of the thermal expansion coefficient of cured 1,2-polybutadiene can be achieved.