Abstract: An optical system (LS) includes lenses (L22,L23) satisfying the following conditional expressions, ndLZ+(0.01425×?dLZ)<2.12, and ?dLZ<35.0, where ndLZ: a refractive index of the lens with reference to d-line, and ?dLZ: Abbe number of the lens with reference to d-line.

Abstract: The present invention provides a vinyl alcohol polymer having properties comparable to the properties of vinyl alcohol polymers of solely petroleum origin, and, in using the vinyl alcohol polymer (PVA), saves petroleum resources, and reduces carbon dioxide emissions in production processes. The present invention relates to a vinyl alcohol polymer (X) obtained through saponification after polymerization of a plant-derived vinyl ester monomer (A) and a petroleum-derived vinyl ester monomer (B), and having a mole ratio (A)/(B) of 5/95 to 100/0.

Abstract: The present invention provides an aqueous dispersion that enables production of a film having improved water resistance, tensile elastic modulus, and stress at break, and with which a decrease of strain at break can be reduced in the film. The present invention relates to an aqueous dispersion comprising an ethylene-vinyl alcohol copolymer (A) and a cellulose nanofiber, the ethylene unit content of the ethylene-vinyl alcohol copolymer (A) being 1 mol % or more and less than 20 mol %.

Abstract: There is provided a vinyl alcohol-based polymer having an ethylenic double bond with a saponification degree of 70 mol % or more, wherein the vinyl alcohol-based polymer is water-soluble; a molar ratio of the ethylenic double bond to the total of vinyl alcohol units and vinyl acetate units is 0.05/100 to 2/100; and a limiting viscosity [?] and a weight-average molecular weight Mw of a vinyl ester-based polymer which is produced by esterifying the vinyl alcohol-based polymer satisfy the following formulas (1) and (2). 4.7?log Mw 6.3??(1) 0.60<(log [?]+3.75)/log Mw<0.

Abstract: There is provided a vinyl alcohol-based polymer having an ethylenic double bond with a saponification degree of 70 mol % or more, wherein the vinyl alcohol-based polymer is water-soluble; a molar ratio of the ethylenic double bond to the total of vinyl alcohol units and vinyl acetate units is 0.05/100 to 2/100; and a limiting viscosity [?] and a weight-average molecular weight Mw of a vinyl ester-based polymer which is produced by esterifying the vinyl alcohol-based polymer satisfy the following formulas (1) and (2). 4.7?log Mw 6.3 ??(1) 0.60<(log [?]+3.75)/log Mw<0.

Abstract: The caged roller assembly includes a roller cage and a plurality of rollers. The roller cage has annular end walls axially spaced from and axially opposed to each other, and a plurality of elongated pillars spaced from each other in a direction circumferentially of the roller cage and extending perpendicularly between respective outer peripheral edges of the annular end walls. The rollers are rollingly accommodated within respective pockets, each defined between the neighboring pillars. An annular inner portion of one or both of the annular end walls, which is situated between the neighboring rollers, is formed with a roller restraint pawl in the form of a bent piece, which operates to prevent the respective roller from being separated radially inwardly away from the roller cage.

Abstract: A rocking bearing is proposed which is low in cost. A raceway is formed on the inner periphery of an arcuate bearing ring. Rolling elements are received in pockets of a retainer provided opposite to the raceway. The bearing ring is formed by pressing a steel plate to reduce the cost and achieve light weight and compactness.

Abstract: A rocking bearing is proposed which is low in cost. A raceway is formed on the inner periphery of an arcuate bearing ring. Rolling elements are received in pockets of a retainer provided opposite to the raceway. The bearing ring is formed by pressing a steel plate to reduce the cost and achieve light weight and compactness.