Abstract: A shock absorbing apparatus that absorbs a shock produced by an abutment of a traveler on a stop member when the traveler is brought to a stop at a predetermined position includes a leaf spring arranged adjacent the stop member in a substantially face-to-face relationship with a guideway. A free end of the leaf spring abuts slightly with the guideway or with a slight clearance from the guideway. A mid portion of the leaf spring is curved gradually from the guideway. The traveler is provided with a contact portion that passes over the free end of the leaf spring to contact with the curved mid portion before the traveler abuts with the stop member at the predetermined position.

Abstract: A shock absorbing apparatus that absorbs a shock produced by an abutment of a traveler on a stop member when the traveler is brought to a stop at a predetermined position comprises a leaf spring arranged adjacent to the stop member in substantially face-to-face relationship with a guideway. A free end of the leaf spring abuts slightly on the guideway or with a slight clearance against the guideway. A midportion of the leaf spring is curved gradually apart from the guideway. The traveler is provided with a contact portion that passes over the free end of the leaf spring to contact with the curved midportion before the traveler abuts on the stop member at the predetermined position.

Abstract: There is provided a soldering flux for circuit board, which is designed to be employed on an occasion of soldering electronic parts on a circuit board, the soldering flux being free from any organic solvent which may become a cause for contaminating air atmosphere and being capable of providing an excellent insulating property. This soldering flux comprises; a rosin-based modified resin having an acid value of not less than 100, a nondissociative activator formed of a nondissociative halogenide, and an aqueous solvent containing a volatile basic agent. There is also provided a circuit board having a flux film formed from such a soldering flux.

Abstract: The invention provides a soldering flux for mounting circuit substrates, which is free from any organic solvent attributable to air pollution and dispenses with any washing step. The soldering flux is obtained by dissolving a rosin modified by an unsaturated organic acid according to the Diels-Alder reaction in an aqueous solvent. A volatile basic agent may further be contained in the flux.

Abstract: Described herein is a printed circuit board surface protective agent containing compounds as expressed by Formula I. ##STR1## (herein, Y is a linear or a branched alkyl group having 1 to 20 carbon atoms or (2) ##STR2## X is any of halogen atom, amino group, di-lower alkylamino group, hydroxy group, lower alkoxy group, cyano group, formyl group, acetyl group, benzoyl group, carbamoyl group, carboxyl group, lower alkoxycarbonyl group, or nitro group; X' is any of alkyl group, halogen atom, amino group, di-lower alkylamino group, hydroxy group, lower alcoxy group, cyano group, formyl group, acetyl group, benzoyl group, carbamoyl group, carboxyl group, lower alkoxycarbonyl group or nitro group; n is an integral number from 1 to 4, and X may be either identical or different when n is in a range from 2 to 4. m is an integral number in a range from 1 to 10, p is 0 or an integral number in a range from 1 to 4, and X' may be either identical or different when p is in a range from 2 to 4.

Abstract: Disclosed is a highly light-transmitting dust protective film composed of at least one member selected from the group consisting of transparent gels of oxides, hydroxides, organic group-containing oxides and organic group-containing hydroxides of polyvalent metals, formed by the sol-gel process.

Abstract: Disclosed is a highly light-transmitting dust protective film composed of at least one member selected from the group consisting of transparent gels of oxides, hydroxides, organic group-containing oxides and organic group-containing hydroxides of polyvalent metals, formed by the sol-gel process.

Abstract: Ferroelectric ceramics represented by xPbTiO.sub.3 -yPbZrO.sub.3 -zPb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3 -mSrTiO.sub.3 -nSnO.sub.2 -pZnO-qBi.sub.2 O.sub.3 -rX wherein x,y,z,m,n,p,q and r represent amounts by mole, respectively, with the proviso that x+y+z being 1, Z is at least one oxide selected from the group consisting of Dy.sub.2 O.sub.3, Ta.sub.2 O.sub.5, and Y.sub.2 O.sub.3, and wherein x is from 0.25 to 0.50, y is from 0.05 to 0.70, z is from 0.05 to 0.70, m is from 0 to 0.10, n is from 0 to 0.04, p is from 0 to 0.04, q is from 0 to 0.02 and r is from 0.005 to 0.02. The disclosed ferroelectric ceramics have increased relative dielectric constant and/or electromechanical coupling factor, and are suitable for use as actuators.

Abstract: An induction heating apparatus for utilizing electromagnetic induction to heat a workpiece. The apparatus includes a pair of heating coil units disposed in spaced-parallel relation to permit transportion of the workpiece between the heating coil units. Each of the heating coil units includes a main heating coil and an auxiliary heating coil disposed at a position adjacent to the main heating coil. The main heating coil has a plurality of spaced-parallel transverse conductors connected in series and produces magnetic field crossing the workpiece, causing heating when supplied with a high- or intermediate-frequency alternating current. The auxiliary heating coil includes a pair of series connected longitudinal conductors placed at positions facing to the workpiece at a small distance inside from the respective opposite side edges of the workpiece.

Abstract: The present invention provides a photosensitive resin composition comprising (a) 10-60 wt. % of a styrene--maleic acid copolymer or its partially esterified product having a molecular weight of 1,000-3,000 and an acid value of 50-500, (b) 1-30 wt. % of acrylate or methacrylate having a tetrahydrofurfuryl group or a hydroxyl group, (c) 1-30 wt. % of diacrylate or dimethacrylate of polyethyleneglycol or polypropylene glycol, (d) 1-40 wt. % of a monoester compound represented by the following general formula (I), (II), (III), (IV) or (V). ##STR1## (wherein, X stands for a divalent organic group, preferably an alkylene group having carbon atoms of 1-4 or --C.sub.n H.sub.2n O--.sub.p CH.sub.2 group wherein n is an integer of 2-6 and p is an integer of 1-19; Y stands for hydrogen atoms or a methyl group; and Y' stands for hydrogen atoms or an alkyl group having carbon atoms of 1-4.).

Abstract: Stretched articles of ultrahigh-molecular-weight polyethylene are prepared by melt-kneading a mixture of ultrahigh-molecular-weight polyethylene with a paraffinic wax having a melting point of 40.degree. to 120.degree. C. and a weight average molecular weight of at least 230 but less than 2000 in a screw extruder while maintaining the temperature of the mixture at 180.degree. to 280.degree. C. The molten mixture is melt-extruded through a die at a temperature of 180.degree. to 300.degree. C. under a draft condition of a draft ratio of less than 2 or in the absence of a draft and the resulting unstretched extrudate is cooled to solidify it. The unstretched solidified extrudate is than subjected to a stretching treatment in a heated liquid medium which is a solvent for the paraffinic wax at a temperature of 60.degree. to 140.degree. C. at a particular stretch ratio.

Abstract: Stretched articles of ultrahigh-molecular-weight polyethylene are prepared by melt-kneading a mixture of ultrahigh-molecular-weight polyethylene with a paraffinic wax having a melting point of 40.degree. to 120.degree. C. and a weight average molecular weight of at least 230 but less than 2000 in a screw extruder while maintaining the temperature of the mixture at 180.degree. to 280.degree. C. The molten mixture is melt-extruded through a die at a temperature of 180.degree. to 300.degree. C. and the resulting unstretched extrudate is cooled to solidify it. The unstretched solidified extrudate is then subjected to a stretching treatment at a temperature of 60.degree. to 140.degree. C. at a particular stretch ratio. Stretch shaped articles of ultrahigh-molecular-weight polyethylene having high tensile strength and modulus of elasticity are produced uniformly and reproducibly. The stretched shaped articles are substantially free from stretching uneveness.

Abstract: A random copolymer consisting essentially of 40 to 90 mole% of propylene and 60 to 10 mole% of 1-butene, and having (A) a boiling n-heptane-insoluble content of not more than 5% by weight based on the weight of the copolymer, (B) a boiling methyl acetate-soluble content of not more than 2% by weight based on the weight of the copolymer, (C) a melting point, determined by differential thermal analysis, of 40 to 140.degree. C., (D) an intrinsic viscosity, determined in decalin at 135.degree. C., of 0.5 to 6 dl/g, (E) an elongation at break, measured by JIS K6301, of at least 300%, (F) a tensile strength at break, measured by JIS K6301, of at least 50 kg/cm.sup.2, and (G) a haze, measured by JIS K6714, of not more than 40%.