Abstract: A coin validation apparatus includes: a conveyor conveying a coin; and a discriminator discriminating authenticity and denomination of the coin, the conveyor including: conveyor pulleys, conveyor belts each endlessly stretched between the conveyor pulleys, conveying members, each having left and right end portions attached to outer surfaces of the conveyor belts, conveying the coin rearwards in a manner laid flat and convey a coin, which has been discriminated by the discriminator as a counterfeit coin, frontwards in a manner laid flat; and guide members, provided on sides of the conveyor belts, preventing the conveying members from being separated from the conveyor belts.

Abstract: A water-absorbent resin usable as a suitable water absorbent in sanitary materials and other fields can be produced by subjecting an aqueous solution of an .alpha.,.beta.-unsaturated carboxylic acid and of an alkali metal salt thereof to polymerization with a radical polymerization initiator in a petroleum-based hydrocarbon solvent in the presence or absence of a crosslinking agent and, in this polymerization, using a saccharose-fatty acid ester as a protective colloid agent.