Abstract: A coated paper prepared by coating an original paper with a paper-coating composition is provided containing a pigment and a copolymer latex having a gel content of 10% by weight or more obtained by polymerizing,(a) 20-65% by weight of a conjugated diene compound,(b) 0.1 to 10% by weight of an ethylenically unsaturated carboxylic acid, and(c) 33-79.5% by weight of at least one ethylenically unsaturated compound other than said components (a) and (b),(d) in the presence of 0.1 to 10 parts by weight of .alpha.-methylstyrene dimer, per 100 parts by weight of a total of components (a), (b) and (c).

Abstract: A process is provided for producing a copolymer latex having a gel content of 10-98% by weight, involving emulsion polymerizing:(a) 20-65% by weight of a conjugated diene compound;(b) 0.1-10% by weight of a combination of an ethylenically unsaturated monocarboxylic acid with an ethylenically unsaturated dicarboxylic acid; and(c) 33-79.5% by weight of at least one ethylenically unsaturated compound other than the components (a) and (b),in the presence of (d) 0.1 to 10 parts by weight of an .alpha.-methylstyrene dimer, per 100 parts by weight of a total of components (a), (b) and (c).

Abstract: A two-stage process for producing a copolymer, comprising emulsion polymerizing (a) a 2-80% by weight of a conjugated diene compound, (b) 0.1-10% by weight of an ethylenically unsaturated carboxylic acid, and (c) 10-97.9% by weight of an ethylenically unsaturated compound other than the components (a) and (b) in the presence of (d) and .alpha.-methylstyrene dimer, wherein in the first stage, 10-50% by weight of the total amount of the components (a), (b) and (c) are added and polymerized at 70.degree.-80.degree. C. for 2-6 hours after the addition of the monomer, and after said first stage, 50-90% by weight of the total amount of the components (a), (b) and (c) are continuously fed and polymerized in a second stage.

Abstract: A method for manufacturing a luminous tube for discharge lamp including sealing, in a closed container having a stream of a desired gas introduced therein, components of a luminous tube by means of the photo energy of a laser light such that the desired gas, at a predetermined pressure, is sealed within the luminous tube.

Abstract: A heating device comprises a laser oscillator which emits a laser beam, a reflector which guides the laser beam from the laser oscillator to an object a support pole for supporting the reflector to pivotally oscillate about an axis substantially perpendicular to an axis of the object, and a pair of electromagnets for oscillating the reflector between a maximum tilted position in one direction and a maximum tilted position in an opposite direction and for stopping the reflector at both maximum tilted positions for a predetermined period. The laser beam which is incident on the reflector reciprocally scans the object in the axial direction of the predetermined range thereof by the oscillation of the reflector.

Abstract: A method of sealing an aperture formed in a discharge tube using a laser beam.A tube having the aperture to be hermetically sealed is placed in a vessel having a window which transmits a laser beam. The aperture is covered with a blockade member. The blockade member is irradiated with the laser beam in order to melt the blockade member and seal the aperture.

Abstract: A gas reaction apparatus has an activation chamber, a heat exchanger and a reaction chamber. A gas is introduced into the activation chamber and activated there by electric discharge. The activated gas is then cooled by the heat exchanger in case a reaction to be effected in the reaction chamber is exothermic or heated by the exchanger in case a reaction to be effected in the reaction chamber is endothermic. The heat resulting from the reaction with the gas can therefore be effectively removed so that a desired reaction is rapidly conducted in the reaction chamber without being followed by a side reaction.