Abstract: A process for preparing poly-.alpha.-amino acid particles comprising polymerizing an .alpha.-amino acid-N-carboxy anhydride using a polymerization initiator in an organic solvent in which both the solubility of the .alpha.-amino acid-N-carboxy anhydride and the solubility of the produced poly-.alpha.-amino acid are 0.1 g/100 ml or less at 25.degree. C. Polyamino acid particles having a high molecular weight and a small bulk specific gravity can be manufactured very easily without requiring specific procedures. The polyamino acid particles can be used as a coating material for papers, resins, rubbers, and fibers; particles for cosmetics; particles for diagnostic drugs; fillers for chromatography; and an encapsulating material for drugs, fertilizers, and perfumes.

Abstract: Solid poly-.alpha.-amino acid particles are obtained by preparing an oil-in-water emulsion from water and an organic solvent having a water solubility of 10 g/100 ml or less, and polymerizing an .alpha.-amino acid-N-carboxy anhydride by emulsion polymerization in the oil-in-water emulsion, or by polymerizing an .alpha.-amino acid-N-carboxy anhydride in water in the presence of an emulsifier and an initiator. Hollow particles can be obtained by adding a poor solvent for the poly-.alpha.-amino acid to the poly-.alpha.-amino acid particles and removing the solvents. These poly-.alpha.-amino acid particles are useful as a novel raw materials for coating on papers, rubbers and fibers, for encapsulating cosmetics, drugs, agricultural chemicals and fertilizers, and as particles for diagnostic reagents.

Abstract: A blood-sampling vessel containing therein a conjugated diene (co)polymer with a weight average molecular weight, reduced to sodium polystyrene sulfonate, of at least 3,000 and containing 2 mmol/g or more of at least one sulfonic acid group or a salt thereof. The vessel can be easily manufactured and constantly exhibits high anticoagulant and fibrinogen-removing capability to the blood contained therein, with no adverse effects on a variety of inspections and tests.

Abstract: A hydrogenated diene copolymer resin composition comprising (A) 5-70% by weight of a hydrogenated diene copolymer which is a hydrogenation product of a random copolymer of at least one conjugated diene and 3-50% by weight of an alkenyl aromatic compound having a number average molecular weight of 5,000-1,000,000 and a molecular weight distribution (Mw/Mn) of 10 or less, the vinyl content in the diene portion of the random copolymer being 10-90%, at least 70% of the olefinic unsaturation of the random copolymer being hydrogenated, and (B) 95-30% by weight of at least one resin selected from the group consisting of a polypropylene resin, a polyphenylene ether resin and an alkenyl aromatic compound polymer resin.

Abstract: A hexene-1/4 methylpentene-1 random copolymer composed of 65 to 90% by weight of hexene-1 unit and 35 to 10% by weight of 4-methylpentene-1 unit and having a polystyrene-reduced number average molecular weight of 20,000 to 500,000, which copolymer is useful in applications as rubber vibration insulators, modifiers for plastics and rubbers and adhesives. Said random copolymer is produced by copolymerizing 60 to 95% by weight of hexene-1 with 40 to 50% by weight of 4-methylpentene-1 in the presence of a Ziegler-Natta catalyst comprising a transition metal component and an organometal compound component.

Abstract: A vibration-damping rubber composition comprising:(A) 100 parts by weight of at least one rubber component selected from the group consisting of (a) at least one hexene-1 type polymer selected from the group consisting of hexene-1 homopolymers and copolymers of hexene-1 and a C.sub.3-20 alpha-olefin other than hexene-1 and (b) at least one graft copolymer selected from the group consisting of a graft copolymer of a hydroxyl group-containing polysiloxane or a copolymer of hexene-1 and a silane compound represented by the general formula I:CH.sub.2 .dbd.CH--(CH.sub.2).sub.n --SiR.sup.1.sub.m X.sub.3-m Iwherein n is an integer of 1 or more, m is 0 or an integer of 1-2, X is a chlorine or bromine atom, and R.sup.1 is a hydrogen atom or a C.sub.1-5 alkyl group and a graft copolymer of a hydroxyl group-containing polysiloxane on a terpolymer of hexene-1, a C.sub.

Abstract: A thermoplastic resin composition obtainable by blending 100 parts by weight of a mixture consisting of(A) 75 to 40% by weight of a propylene polymer,(B) 20 to 40% by weight of an ethylene-alpha-olefin copolymer, and(C) 5 to 30% by weight of a graft copolymer obtained by copolymerizing an aromatic vinyl compound and a polar vinyl compound in the presence of an ethylene-alpha-olefin copolymerwith(D) 0.1 to 5 parts by weight of an unsaturated dicarboxylic acid, an anhydride thereof or a mixture of the two, and(E) 0.01 to 0.3 part by weight of an organic radical-generating agent,and then subjecting the resulting blend to thermal treatment. Said composition has not only a high bending modulus inherently possessed by polypropylene resins but also remarkably improved coating property. Accordingly, the composition is useful as interior and exterior trim parts of automobiles and exterior trim parts of motorcycles.

Abstract: A process for producing an olefin copolymer rubber containing 25 to 75% by weight of propylene, which comprises polymerizing ethylene and propylene, or ethylene, propylene and at least one nonconjugated diene, in solution in the presence of a catalyst, said catalyst being composed of (A) a Ti-containing solid component precipitated from a liquid product obtained by reacting a titanium tetrahalide with an organomagnesium compound in a halogenated hydrocarbon solvent in the presence of an ether represented by the general formula R.sup.1 OR.sup.2 wherein R.sup.1 and R.sup.2 are identical or different and each represents a hydrocarbon group having 2 to 12 carbon atoms, and (B) an organoaluminum compound.

Abstract: In a process for producing a rubbery olefinic copolymer which comprises random-copolymerizing at least two olefins in the presence of a catalyst composed of (A) a titanium compound and (B) an organometallic compound of a metal of Groups I to III of the periodic table, the improvement wherein the titanium compound (A) of the catalyst is a solution of a solid titanium halide in a hydrocarbon solvent, a halogenated hydrocarbon solvent or a mixture of both, said solid titanium halide being rendered soluble in said solvent.

Abstract: In a process for producing a rubber olefin copolymer which comprises random copolymerization of at least two olefins in the presence of a catalyst composed of (A) a titanium compound and (B) an organometallic compound of a metal of Groups I to III of the periodic table, the improvement wherein the titanium compound (A) is a liquid product obtained by treating a titanium tetrahalide of the general formula TiX.sub.4 in which X represents Cl, Br or I in a hydrocarbon, a halogenated hydrocarbon or a mixture of both in the presence of an ether with at least one member selected from the group consisting of (1) an organoaluminum compound, (2) an organomagnesium compound and (3) a combination of hydrogen and at least one metal or metal compound selected from the group consisting of metals of Group IB, IIB, IVB and VIII of the periodic table, compounds of metals of Group VIII of the periodic table, cuprous chloride, titanium hydride and zirconium hydride.

Abstract: In a process for producing a titanium trihalide by reducing a titanium tetrahalide with hydrogen, the improvement wherein the reduction is carried out in an organic solvent in the presence of an ether and at least one member of the group consisting of metals of Groups IB, IIB, IVB and VIII of the periodic table and compounds of these materials.

Abstract: In the preparation of 1,2-polybutadiene with a vinyl content of at least 70% by contacting 1,3-butadiene with a catalyst consisting of:(A) a cobalt compound,(B) an organic phosphine compound,(C) a trialkylaluminum compound, and(D) water in an amount of 0.1 to 1.2 moles per mole of said trialkylaluminum,in the presence of a molecular weight regulator,(E) an alkylaluminum halide compound is used as the molecular weight regulator in an amount of at least 0.01 mole per mole of the trialkylaluminum compound (C), whereby 1,2-polybutadiene with a regulated molecular weight can be produced without causing decreased polymerization activity and change of vinyl content and crystallinity of the produced polymer. The alkylaluminum halide compound (E) is preferably used in an amount of 0.05 to 1.0 mole per mole of the trialkylaluminum compound (C).

Abstract: A process for preparing crystalline 1,2-polybutadiene by contacting 1,3-butadiene with a catalyst consisting of (A) a cobalt compound, (B) an organoaluminum compound, (C) water in an amount of 0.25 to 1.5 mole per mol of said organoaluminum compound, and (D) an organic phosphorus compound in a halogenated hydrocarbon solvent to polymerize the butadiene, characterized in that as said organic phosphorus compound there is used a compound represented by the formula: ##STR1## wherein R.sup.1 is an alkyl or aryl group, and R.sup.2 and R.sup.3 represent independently hydrogen, or alkyl or aryl groups. This process can produce 1,2-polybutadiene having a degree of crystallization of 25 to 50% in a high yield at a temperature of from 0.degree. to 30.degree. C.

Abstract: In the production of 1,2-polybutadiene by contacting 1,3-butadiene with a catalyst composed of (A) a cobalt compound, (B) an organic phosphine compound, (C) trialkylaluminum and (D) water in an amount of 0.25 to 1.5 moles per mole of said trialkylaluminum, the addition of (E) at least one compound selected from the group consisting of allyl halides, alkyl-substituted allyl halides, benzyl halides, alkyl-substituted benzyl halides, and tertiary aliphatic halides to the reaction system enables the molecular weight of the objective 1,2-polybutadiene to be regulated to any desired value without causing any change in microstructure and degree of crystallization of the product and also without deteriorating so much the polymerization activity.

Abstract: A catalyst composition consisting essentially of a reaction mixture of (A) at least one member selected from the group consisting of compounds of W, Mo, Re and Ta, (B) at least one member selected from the group consisting of organometallic compounds of elements of Groups IA, IIA, IIB and IIIA of the Deming Periodic Table, and (C) at least one member selected from the group consisting of compounds of V, Cr, Mn, and elements of Groups IVB and VIII of the Deming Periodic Table, has a very high activity in the ring-opening polymerization of norbornene derivatives having at least one polar substituent selected from the group consisting of ester groups, nitrile groups, amide groups, imide groups, carboxylic acid anhydride groups and halogens. The metal atom ratio of (C)/(A) is usually 0.001-50, and the molar ratio of (B)/(A) is usually 1-10.

Abstract: A catalyst composition consisting essentially of a reaction mixture of (A) at least one member selected from the group consisting of compounds of W, Mo, Re and Ta, (B) at least one member selected from the group consisting of organometallic compounds of elements of Groups IA, IIA, IIB and IIIA of the Deming Periodic Table, and (C) at least one member selected from the group consisting of compounds of V, Cr, Mn, and elements of Groups IVB and VIII of the Deming Periodic Table, has a very high activity in the ring-opening polymerization of norbornene derivatives having at least one polar substituent selected from the group consisting of ester groups, nitrile groups, amide groups, imide groups, carboxylic acid anhydride groups and halogens. The metal atom ratio of (C)/(A) is usually 0.001 - 50, and the molar ratio of (B)/(A) is usually 1 - 10.