Abstract: A method for the production of a particulate hydrogel polymer by the exposure of a hydrogel polymer possessing a cross-linked structure to shear force in a vessel thereby finely dividing said hydrogel polymer, which method comprises exerting shear force repeatedly on said hydrogel polymer while keeping said hydrogel polymer at a temperature in the range of from 40.degree. to 110.degree. C. under a mechanical pressure in the range of from 0.01 to 1.5 kg/cm.sup.2, and method for the production of an absorbent resin comprising drying the resultant particulate hydrogel polymer.

Abstract: Water-absorbent resins having an average particle diameter of 100 to 600 .mu.m and a particle diameter distribution of 0.35 or less are prepared by polymerizing an aqueous solution of a water-soluble ethylenically unsaturated monomer, pulverizing and sieving the gel-like polymer so obtained, and crosslinking the surface of the polymer powder. In an alternative process, an aqueous solution of the monomer having a viscosity greater than 15 cps is dispersed in a hydrophobic organic solvent and polymerized to obtain a polymer powder, and the surface of the polymer powder is crosslinked.

Abstract: An electronic apparatus is provided with a main battery, semiconductor memories having a chip select input (active low), a backup battery, a pull-up resistor, a control unit for selecting one of the semiconductor memories, and a selection control line connected between the control unit and the chip select input. The selection control line is connected to the backup battery through the pull-up resistor. A switch for closing or opening the selection control line is connected between the selection control unit and the junction point of the control line and the pull-up resistor. A switch control unit is provided which controls the switch to open the control line when the semiconductor memory is powered by the backup battery. In another electronic apparatus having a detection circuit for detecting the voltage of the backup battery, the switch is closed only when the voltage is to be monitored.

Abstract: In a conveying apparatus (used in assembling for example, semiconductors), workpieces are conveyed and distributed to each one of a plurality of processing devices such as bonders via a single conveying line that is made up with a plurality of conveyors provided for each processing device. Sensors are used for checking the workpieces to control the conveyors so that workpieces are avoided from colliding with each other.

Abstract: An absorbent body having an absorbent polymer and hydrophilic fibers as main components thereof, characterized by the fact that the density of said absorbent body is in the range of from 0.1 to 0.5 g/cm.sup.3 or a ratio of wet swelling is not less than 200%, a capacity of said absorbent body for absorption of physiological saline solution under pressure is in the range of from 11 to 25 g/g, and the ratio of exfoliation of said absorbent polymer is not more than 45%, and an absorbent article comprising a liquid-pervious surface material, a liquid-impervious lining material, and the absorbent body layer interposed therebetween.

Abstract: A method for treating the surface of an absorbent resin which comprises mixing (I) 100 parts by weight of an absorbent resin powder having a carboxyl group, (II) 0.01 to 30 parts by weight of a polyhydric alcohol, (III) 0 to 50 parts by weight of water and (IV) 0 to 60 parts by weight of a hydrophilic organic solvent, and heat-treating at a temperature in the range of 90.degree. to 250.degree. C. to treat the surface of said absorbent resin powder (I) until the reaction of said absorbent resin powder (I) with said polyhydric alcohol (II) is completed, wherein the time for completion of the reaction is the time that satisfies the following equation (a-1):30.ltoreq.(100+C)B/A.ltoreq.

Abstract: A method of treating the surface of an absorbent resin, which comprises mixing (A) 100 parts by weight of an absorbent resin powder possessing a carboxyl group (B) 0.01 to 30 parts by weight of a cross-linking agent, (C) 0 to 50 parts by weight of water, and (D) 0 to 60 parts by weight of a hydrophilic organic solvent in a high-speed stirring type mixer provided with an inner surface formed substantially of a substrate (I) possessing a contact angle of not less than about 60.degree. with respect to water and a heat distortion point of not lower than about 70.degree. C. and completing reaction of said absorbent resin powder (A) with said cross-linking agent (B).

Abstract: In a body fluid-absorbing article composed of a liquid-permeable front-surface member, a liquid-impermeable rear-surface member, and a fibrous absorbent member nipped therebetween and adapted to be used with the front-surface member held in contact with the human body, by the improvement having disposed in half of the thickness of the absorbent member on the front-surface member side an absorbent composite (A) obtained by applying an ethylenically unsaturated monomer capable of forming an absorbent polymer by polymerization or an aqueous solution of the monomer to a fibrous web and thereafter polymerizing the monomer.

Abstract: A method of preparation of an absorbent composite in which an aqueous solution containing a water-soluble radical polymerization initiator and a water-soluble ethylenically unsaturated monomer which can be converted into an absorbent polymer by polymerization is applied to a substrate, and the monomer is polymerized while the substrate to which the aqueous solution is applied is, on both the sides, held in contact with polymerization-inert surfaces facing each other. A continuous manufacturing method includes the sequential steps of continuously passing a substrate through (1) a region applying to the substrate an aqueous solution containing a water-soluble radical polymerization initiator and a water-soluble ethylenically unsaturated monomer which can be converted into an absorbent polymer by polymerization, and (2) a region of polymerizing the monomer while maintaining the substrate, on both the sides, in contact with polymerization-inert surfaces facing each other.

Abstract: Water-absorbent resins having an average particle diameter of 100 to 600 .mu.m and a particle diameter distribution of 0.35 or less are prepared by polymerizing an aqueous solution of a water-soluble ethylenically unsaturated monomer, pulverizing and sieving the gel-like polymer so obtained, and crosslinking the surface of the polymer powder. In an alternative process, an aqueous solution of the monomer having a viscosity greater than 15 cps is dispersed in a hydrophobic organic solvent and polymerized to obtain a polymer powder, and the surface of the polymer powder is crosslinked.

Abstract: A bonding method including the steps of dividing a substrate into a plurality of regions along its length, storing substrate feeding data and bonding pattern data for the respective regions into a data memory, feeding the substrate underneath a bonding tool in accordance with the substrate feeding data, and then successively performing bonding for the respective regions in accordance with the bonding pattern data.

Abstract: The present invention is a method for the production of a water absorbent resin, which comprises preparing a monomer component possessing an ability to form a cross-linked structure and convert itself into a hydrated gel polymer during the course of aqueous solution polymerization, possessing an acid group-containing monomer content of at least 50 mol %, and having 10 to 50 mol % of said acid group-containing monomer neutralized and subjecting said monomer component to aqueous solution polymerization within a reaction vessel having a plurality of rotary shafts each fitted with stirring blades.

Abstract: This invention relates to a water-absorbent resin of a new, novel type obtained from polymerization of water-soluble ethylenically unsaturated monomer and a process for producing this resin.The water-absorbent resin in this invention has average particle diameter in a specially defined range and a narrow range of particle distribution, being superior in water-absorption capacity, and also, being superior in handling properties in a point of that, when being mixed with liquid, formation of a fish-eye is absent. The water-absorbent resin shows an angle-lacking, non-sphere shape and, in a case of shape like this, is superior in handling properties in a point that being hard in falling off from an basis material.

Abstract: A method for the production of a hydrophilic polymer having a small residual monomer content from a hydrated gel polymer, which method comprises drying said hydrated gel polymer by contact thereof with a gas containing at least steam and having a dew point in the range of 50.degree. to 100.degree. C. at a temperature in the range of 80.degree. C. to 250.degree. C., and a hydrophilic polymer obtained therefrom.

Abstract: The invention provides [I] a water-absorbing agent composed of a water-absorbing resin powder having the molecular chains near its surface being crosslinked, said powder being obtained by mixing 100 parts by weight of a powder of a carboxyl-containing water-absorbing resin selected from the group consisting of a hydrolyzate of a starch-acrylonitrile graft polymer, a partially neutralized product of a starch-acrylic acid graft polymer, a saponification product of a vinyl acetate-acrylic ester copolymer, a hydrolyzate of an acrylonitrile copolymer, a crosslinked product of a hydrolyzate of an acrylonitrile copolymer, a hydrolyzate of an acrylamide copolymer, a crosslinked product of a hydrolyzate of an acrylamide copolymer, a partially neutralized product of polyacrylic acid, and a crosslinked product of partially neutralized polyacrylic acid with 0.001 to 10 parts by weight of a polyhydric alcohol, 0.

Abstract: A method for the production of a polymer from an aqueous solution of a corresponding .alpha., .beta.-ethylenically unsaturated monomer, which method is characterized by forwarding said aqueous monomer solution and an inert gas each in the form of a continuous flow toward the site of polymerization, spouting either of said two fluids through a nozzle parallelly into the flow of the other fluid thereby creating forced contact between said aqueous monomer solution and said inert gas and effecting substantial removal of dissolved oxygen from said aqueous monomer solution before said aqueous monomer solution reaches the site of polymerization.