Abstract: A rubber composition for a tire tread contains styrene-butadiene rubber in a compounding amount of 100 parts by weight, silica in a compounding amount of 90 to 170 parts by weight, and an aromatic modified terpene resin in a compounding amount of 10 to 30 parts by weight. The styrene-butadiene rubber contains 40 to 100% by weight of solution-polymerized styrene-butadiene rubber (S-SBR1) and 60 to 0% by weight of solution-polymerized styrene-butadiene rubber (S-SBR2), the total content thereof being 100% by weight. The S-SBR1 has a styrene content of 30 to 38% by weight and a vinyl content of 60 to 80% by weight, the total content thereof being 100% by weight, a glass transition temperature of ?20 to ?5° C., and a weight average molecular weight of 1,000,000 to 1,800,000.

Abstract: A rubber composition for a tire tread contains styrene-butadiene rubber in a compounding amount of 100 parts by weight, silica in a compounding amount of 90 to 170 parts by weight, and an aromatic modified terpene resin in a compounding amount of 10 to 30 parts by weight. The styrene-butadiene rubber contains 40 to 100% by weight of solution-polymerized styrene-butadiene rubber (S-SBR1) and 60 to 0% by weight of solution-polymerized styrene-butadiene rubber (S-SBR2), the total content thereof being 100% by weight. The S-SBR1 has a styrene content of 30 to 38% by weight and a vinyl content of 60 to 80% by weight, the total content thereof being 100% by weight, a glass transition temperature of ?20 to ?5° C., and a weight average molecular weight of 1,000,000 to 1,800,000.

Abstract: Fluid colloidal crystals comprising a solid-liquid dispersion electrostatically charged at not more than 2000 ?S/cm in terms of an electrical conductivity, wherein the solid-liquid dispersion comprises, as a dispersoid, electrostatically chargeable spherical colloidal particles of an organic or inorganic polymer having a mean volume diameter (d) of not more than 30 ?m, and as a dispersion medium, an aqueous solution or a dissolving water-containing non-aqueous solution, the dispersion concentration of the spherical colloidal particles is not more than 70%, around the dispersoid an electric double layer of a given thickness (?e) is formed, and the spherical colloidal particles form a three-dimensionally ordered lattice that shows fluidity and is a particle array structure in which the colloidal particles are aligned longitudinally and laterally in a lattice form while an interparticle distance (L) defined as a distance between centers of the particles arranged opposite to each other along the center line satis

Abstract: Monodisperse colored spherical particles each having two separated color regions of two hues, that is, two-colored spherical particles, useful, for example, for displays of characters, graphics, images and the like, the two hues being for reverse display in terms of electricity and magnetism from the viewpoint of good suitability for display are provided. In the production process and the apparatus for producing the colored spherical polymer particles, microchannels are utilized including a first microchannel through which a colored continuous phase comprising a color dye/pigment dispersed in a fluid dispersing medium containing a polymerizable resin component and having colored phases of different hues is transferred, and a second microchannel through which a spheroidizing disperse phase flows.

Abstract: Fluid colloidal crystals comprising a solid-liquid dispersion electrostatically charged at not more than 2000 ?S/cm in terms of an electrical conductivity, wherein the solid-liquid dispersion comprises, as a dispersoid, electrostatically chargeable spherical colloidal particles of an organic or inorganic polymer having a mean volume diameter (d) of not more than 30 ?m, and as a dispersion medium, an aqueous solution or a dissolving water-containing non-aqueous solution, the dispersion concentration of the spherical colloidal particles is not more than 70%, around the dispersoid an electric double layer of a given thickness (?e) is formed, and the spherical colloidal particles form a three-dimensionally ordered lattice that shows fluidity and is a particle array structure in which the colloidal particles are aligned longitudinally and laterally in a lattice form while an interparticle distance (L) defined as a distance between centers of the particles arranged opposite to each other along the center line satis

Abstract: A method for bulk polymerization of monomers having a polymerizable unsaturated bond consisting mainly of an alkyl acrylate, which comprises adding a polymerization initiator having a 10 hours half-life temperature of 41.0° C. or below to the monomers in an amount of 0.0001 to 0.5 parts by weight based on 100 parts by weight of the monomers to initiate polymerization of the monomers, allowing after the reaction initiation the temperature of the reaction mixture to reach a maximum of 100 to 140° C. by the self-exotherm of the reaction system due to the consumption of the polymerization initiator, and thereby polymerizing 15 to 50% by weight of the monomers used.

Abstract: Monodisperse colored spherical particles each having two separated color regions of two hues, that is, two-colored spherical particles, useful, for example, for displays of characters, graphics, images and the like, the two hues being for reverse display in terms of electricity and magnetism from the viewpoint of good suitability for display are provided. In the production process and the apparatus for producing the colored spherical polymer particles, microchannels are utilized including a first microchannel through which a colored continuous phase comprising a color dye/pigment dispersed in a fluid dispersing medium containing a polymerizable resin component and having colored phases of different hues is transferred, and a second microchannel through which a spheroidizing disperse phase flows.

Abstract: An acrylic pressure sensitive adhesive composition comprising 5 to 75 parts by weight of an adherent polymer (a) comprising (meth)acrylic ester component units as principal structural units and having a weight average molecular weight of 50,000 or more; 5 to 40 parts by weight of a tackifier resin (b) comprising (meth)acrylic ester component units as principal structural units and having a weight average molecular weight of 20,000 or less; and 20 to 90 parts by weight of monomers (c) whose principal component is a (meth)acrylic ester, wherein substantially no solvent is contained is provided. Further, a pressure sensitive adhesive tape having a pressure sensitive adhesive layer superimposed on a support surface is provided by coating the support surface with the above acrylic pressure sensitive adhesive composition, which contain a partial polymerizate, and carrying out a polymerization reaction on the support surface.

Abstract: The acrylic sheet of the invention is an acrylic sheet mainly having excellent suitability for adhesion to a three-dimensional curved surface, and is formed from an acrylic resin comprising a crosslinked acrylic polymer having a structure obtained by crosslinking 100 parts by weight of an acrylic polymer, which is a (co)polymer of a monomer containing an alkyl (meth)acrylate as a main component and has Tg of −10 to 30° C. and a weight-average molecular weight of 100000 to 500000, with 0.1 to 10 parts by weight of an epoxy crosslinking agent having two or more epoxy groups in its molecule and/or 1 to 30 parts by weight of an isocyanate crosslinking agent having two or more isocyanate groups in its molecule. This acrylic sheet is excellent in the three-dimensional curved surface-follow properties and in the printability.

Abstract: An acrylic pressure sensitive adhesive composition comprising 5 to 75 parts by weight of an adherent polymer (a) comprising (meth)acrylic ester component units as principal structural units and having a weight average molecular weight of 50,000 or more; 5 to 40 parts by weight of a tackifier resin (b) comprising (meth)acrylic ester component units as principal structural units and having a weight average molecular weight of 20,000 or less; and 20 to 90 parts by weight of monomers (c) whose principal component is a (meth)acrylic ester, wherein substantially no solvent is contained is provided. Further, a pressure sensitive adhesive tape having a pressure sensitive adhesive layer superimposed on a support surface is provided by coating the support surface with the above acrylic pressure sensitive adhesive composition, which contain a partial polymerizate, and carrying out a polymerization reaction on the support surface.

Abstract: A process for producing a solvent-free acrylic sheet includes a coating step which may involve either coating at least one support with a solvent-free syrupy composition for coating polymerization or applying the solvent-free coating polymerization syrupy composition between at least two supports at a coating thickness of at least 0.15 mm to form a laminate. The solvent-free coating polymerization syrupy composition includes an acrylic vinyl monomer capable of radical polymerization.The process further includes a heating polymerization step in which the laminate is heated at 60.degree. C. or higher for reaction initiation so that autoexotherm is induced to cause the acrylic vinyl monomer to polymerize.The process concludes with an aging polymerization step in which the laminate having undergone the heating polymerization step is maintained at a temperature that is at least 30.degree. C.

Abstract: A developing solution comprising a specific amount of a quaternary ammonium hydroxide represented by the general formula [(R.sup.1).sub.3 N--R].sup.+ .multidot.OH.sup.- (R indicates an alkyl group having 1 to 3 carbon atoms or a hydroxy-substituted alkyl group having 1 to 3 carbon atoms, and R.sup.1 indicates an alkyl group having 1 to 3 carbon atoms) and, if necessary, a quaternary ammonium hydrogen carbonate represented by the general formula [(R.sup.1).sub.3 N--R].sup.+ .multidot.HCO.sub.3.sup.- (R and R.sup.1 are the same as the above) and having a pH in the range of 9 to 13, and a process for producing printed circuit boards using an organic alkali solution, are provided. The developing solution needs no defoaming agent because it causes little foaming. Printed circuit boards produced by using the developing solution have excellent finished accuracy. Therefore, fine circuits of printed circuit networks can be produced with stability.