Abstract: A matte thermoplastic resin composition consisting essentially of:(A) 70-97% by weight of a rubber-modified alkenyl a romatic thermoplastic resin and(B) 30-3% by weight of a graft copolymer as a high polymer modifier for matting, obtained by polymerizting an ethylenically unsaturated carboxylic acid and at least one monomer selected from the group consisting of an alkenyl aromatic compound, an alkenyl cyanide compound and other copolymerizable alkenyl monomer in the presence of a rubbery polymer latex, wherein the content of the ethylenically unsaturated carboxylic acid component in the graft copolymer (B) is 1-30% by weight and the content of the rubbery polymer in the graft copolymer (B) is 10-60% by weight. Said composition has an excellent matte effect especially when the rubbery polymer latex gives a percentage coagulation of 20% by weight or less based on the total solids of the latex when 15% by weight, based on the total solids, of methacrylic acid is added to the latex.

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 catalyst consisting essentially of (A) a cobalt compound and (B) an organic phosphorus compound represented by the formula: ##STR1## wherein R.sup.1 and R.sup.2 are independently hydrogen atoms, alkyl groups or aryl groups, and three X's, which may be the same or different, are electron-donating groups. This catalyst is effectively used in a process for producing a conjugated diene polymer by polymerizing a conjugated diene in a hydrocarbon or halogenated hydrocarbon solvent in the presence of the above catalyst together with (C) an organoaluminum compound and (D) 0.25-1.5 mols, per mol of the organoaluminum compound (C), of water.

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 novel rubber compound which comprises 100 parts by weight of a rubber component (I), 0.1-15 parts by weight of an amine salt of carboxylic acid (II) and 0-7 parts by weight of sulfur (III), said rubber component (I) consisting of 40-100% by weight of an elastomeric copolymer (A) and 60-0% by weight of a vulcanizable rubber (B); said elastomeric copolymer (A) being composed of a C.sub.4 or C.sub.5 conjugated diene, styrene, and a glycidyl group-containing monomer; the amount of said conjugated diene, the total amount of said conjugated diene and said styrene and the amount of said glycidyl group-containing monomer being 50% by weight or more, 80-99.5% weight and 0.5-20% by weight, respectively, based on the weight of said elastomeric copolymer (A); and the content of said glycidyl group-containing monomer in said rubber component (I) being 0.

Abstract: Polydiene polyurethanes having high tear strength are obtained by using polydiene glycols, prepared with use of lithium-based catalyst, having a number average molecular weight of 1,000 to 5,000 and functionality of 1.8 - 2.1, diisocyanates and chain-extending agents, and by controlling chemical cross-link density being 4 .times. 10.sup.-5 mole/cc and less. When the chemical cross-link density is within the above range, elongation and tensile strength in addition to tear strength of the polyurethane are improved significantly. Furthermore, when 10 - 50 parts by weight of the specified carbon black are added to 100 parts by weight of the mixture of the prepolymer, the chain-extending agent and the additive prior to curing the prepolymer, these mechanical properties of the polyurethane are improved further.