Nippon Oil Company

Saburo Matsubara

Sakuya Iwai

Shinichi Yagi

Seizo Kobayashi

Kazuo Kawai

Yoshihiro Gohshi

Katsumi Usui

Yoshihiro Goushi

A masterbatch composition for thermoplastic resin modification containing a polybutene and an ethylene-.alpha.-olefin copolymer obtained by copolymerizing ethylene with .alpha.-olefin in the presence of specific catalysts and characterized by specific properties, and a method for preparing the composition by kneading and extrusion at a temperature ranging from the maximum peak temperature (Tm) to (Tm-45).degree. C. in accordance with differential scanning calorimetry of the copolymer are disclosed. Masterbatch pellets for thermoplastic resin modification having low surface tackiness can be obtained from the composition.

Masterbatch composition for thermoplastic resin modification and method

A method for the preparation of masterbatch compositions for use in thermoplastic resin modification by blending polybutene with an ethylene..alpha.-olefin copolymer which is obtained by copolymerizing ethylene and .alpha.-olefin in the presence of specific catalysts and has specific characteristics such as a density of exceeding 0.910 g/cm.sup.3 and 0.940 g/cm.sup.3 or less, and successively by kneading and extruding the blend in the temperature range from the maximum peak temperature (Tm) to (Tm-45.degree. C.) in accordance with differential scanning calorimetry (DSC).

Preparation method of masterbatch composition for thermoplastic resin

Disclosed is a method of making ceramic articles which comprises the steps of shaping ceramic powder with the aid of an organic binder and firing the resulting shaped body, characterized in that a mixture of (A) 90 to 10% by weight of an isobutylene polymer and (B) 10 to 90% by weight of an acrylic polymer is used as the organic binder in an amount of 0.2 to 20 parts by weight per 100 parts by weight of the ceramic powder. The use of the aforesaid organic binder makes it possible to produce shaped bodies having high green strength and, moreover, dense fired products.

Method of making ceramic articles

Pressure-sensitive adhesive compositions are disclosed which essentially comprise (I) a base block copolymer, (II) a resinous tackifier, (III) a selected naphthenic or paraffinic mineral oil and (IV) a selected aromatic synthetic oil. Tackiness, adhesion, cohesion and corrugated fiber board adhesiveness characteristics can be greatly improved by the addition of specified amounts of such mineral oil and aromatic oil as softeners.

Pressure-sensitive adhesive composition produced from a base block

Disclosed is a method of making ceramic articles which comprises the steps of shaping a composition for the manufacture of ceramics and firing the resulting shaped body, characterized in that the composition for the manufacture of ceramics contains (a) ceramic powder; (b) an organic binder comprising one or more member selected from the group consisting of homopolymers and copolymers derived from (1) bicyclo[2.2.1]heptene-2 and its derivatives, which are respresented by the formula ##STR1## where R.sup.1 is --H, --CH.sub.3, --CO.sub.2 CH.sub.3 or --OCOCH.sub.3, R.sup.2 is --H or --OCOCH.sub.3, and R.sup.1 is --OCOCH.sub.3 when R.sup.2 is --OCOCH.sub.3, and (2) dicyclopentadiene; and (c) a plasticizer and/or (d) a hydrocarbon solvent. This method makes it possible to produce green sheets having excellent flexibility and high tensile strength, dry-pressed bodies having high green strength, and dense fired products.

A process for preparing a hydrogenated hydrocarbon resin is provided which comprises the steps of: (A) polymerizing 100 parts by weight of a hydrocarbon mixture containing fractions of cracked oils obtained by cracking of petroleum and having boiling points ranging within from 140.degree. to 280.degree. C., said polymerization being effected in the presence of 0.1 to 3.0 parts by weight of a phenol and 0.01 to 5.0 parts by weight of a Friedel-Crafts catalyst at - (minus) 30.degree. C. to + (plus) 60.degree. C. to obtain a polymerized hydrocarbon mixture; (B) adding 0.1 to 20 parts by weight of a basic substance to 100 parts by weight of said polymerized hydrocarbon mixture, to neutralize said polymerized hydrocarbon mixture at 10.degree. to 100.degree. C.; (C) further adding an activated clay in an amount of 0.1 to 20 parts by weight based on 100 parts by weight of said polymerized hydrocarbon mixture, to treat said neutralized hydrocarbon mixture with said activated clay at 10.degree. to 100.degree. C.; and (D) hydrogenating said hydrocarbon mixture treated with said activated clay.

Process for preparing hydrogenated hydrocarbon resin

Polyvinyl acetate compositions are provided for use as adhesive and coating agents and contain plasticizers readily available from aromatic compounds, which plasticizers are highly compatible with polyvinyl acetate and free of toxic components.

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Yokohama, Japan

Saburo Matsubara