Abstract: A syndiotactic styrenic polymer having a narrow molecular weight distribution which is a (co)polymer comprising at least one structural unit represented by the following Formula (1): wherein C1 of a phenyl group thereof has a tacticity of 30% or more in terms of a racemic pentad determined by 13C-NMR, and Ra and m are as defined in the specification. The disclosure is also directed to a block copolymer comprising the above polymer as one segment, to a block graft polymer prepared by modifying one block of the above polymer with a nitrogen-containing aromatic polymer, and to a process for preparing a syndiotactic styrenic polymer in which a styrenic monomer is polymerized in the presence of a catalyst comprising a reaction product of a transition metal compound and at least one co-catalyst selected from organic aluminunoxy compounds.

Abstract: A process for preparing olefinic living polymers having a molecular weight distribution (Mw/Mn) of 1 to 1.3, comprising polymerizing an olefinic monomer having 2 to 20 carbon atoms at low temperatures in the presence of a catalyst comprising (A) a hafnium or zirconium-containing compound having one or two cyclopentadienyl backbones, (B) a triphenyl boron compound or a tetraphenyl borate compound and optionally (C) a specific mono-, di- or trialkylaluminum compound. When the catalyst comprising the zirconium-containing compound is prepared by further using a titanium-containing compound (D), the polymerization temperature can be raised.

Abstract: A butadiene polymer (i) having a cis bond unit content of at least 50% based on the total butadiene units, a number average molecular weight (Mn) of 1,000 to 10,000,000, and at least 80%, based on the total molecular chains, of living chains containing a transition metal of group IV of the Periodic table at a terminal thereof; a polymer (ii) obtained by modifying terminals of the polymer (i); and a polymer (iii) obtained by coupling the polymers (i). These polymers (i), (ii) and (iii) are obtained by polymerizing a conjugated diene monomer alone or with a copolymerizable monomer at a specific temperature in the presence of a catalyst comprising a compound (A) of a transition metal of group IV of the periodic table having a cyclopentadienyl structure and a co-catalyst (B) selected from organoaluminum-oxy compound (a) and others and optionally further by contacting the resultant polymer with a terminal modifier or a coupling agent.

Abstract: A catalyst comprising an organoaluminum compound and a vanadium chelate compound having the lability to cause olefins to undergo living coordination polymerization is contacted with a terminal diolefin to obtain a catalyst for living polymer production. When the above contact is:conducted in the presence of a cycloolefin or an internal olefin, the yield of a living polymer can be improved. By modifying all ends of the living polymer obtained, a telechelic olefin polymer is obtained in which all the polymer chains are modified with functional groups.

Abstract: A method of growing crystals utilizing the temperature dependence of solubility of a crystalline material which is characterized in that crystals are deposited by locally controlling the temperature of a solution containing the crystalline material to take a suitable value. Larger crystals can be formed.

Abstract: The invention provides a very efficient method for the improvement of the antistatic performance, e.g. decrease in the accumulation of static electricity on the surface and decrease in the surface resistivity, of a synthetic resin shaped article with outstanding durability of the effect. The method comprises two steps in principle, first of which is the formation of a crosslinked layer in the surface portion of the shaped article by a variety of known methods effective for the formation of crosslinks in polymeric materials and the second of which is the exposure of the thus crosslinked surface of the article to low temperature plasma produced in an atmosphere containing a gaseous silicon-containing compound which may be a silane compound or a low-molecular weight vaporizable siloxane compound to form a plasma-polymerized surface film of the silicon compound on the crosslinked layer.

Abstract: The invention provides a novel method for obtaining a shaped article of a vinyl chloride-based resin which is markedly insusceptible to the undesirable phenomenon of exudation or bleeding of the plasticizer and other additive ingredients contained therein on to the surface of the article. The method comprises formulating the resin composition for the fabrication of the shaped article with an epoxy compound containing, preferably, at least 2% by weight of the oxirane oxygen in the molecule in an amount of at least 0.05% by weight based on the vinyl chloride-based resin and irradiating the shaped article with ultraviolet light having a substantial energy distribution in the wavelength region of 200 nm or shorter. The shaped article obtained by the inventive method is remarkably insusceptible to the plasticizer bleeding even after prolonged outdoor exposure or irradiation with ultraviolet light having wavelengths longer than 290 nm.

Abstract: A method for reducing static electricity on the surface of a shaped article made of polyvinyl chloride resins, which method comprises the steps of (a) blending a surface active agent with the polyvinyl chloride resin prior to fabrication of the resin into a shaped article, (b) fabricating the resin admixed with the surface active agent into a shaped article, and (c) subjecting the shaped article to a treatment with low temperature plasma of a gas.

Abstract: A method for preventing bleeding of plasticizers on the surface of shaped articles of plasticized polyvinyl chloride resins. The method comprises the steps of (a) blending a urethane elastomer with the polyvinyl chloride resin together with the plasticizer and other optional additives prior to fabrication of the polyvinyl chloride resin composition into shaped articles, (b) fabricating the resin composition into desired shaped articles, and (c) subjecting the thus shaped article to a treatment with low temperature plasma of a gas. Carbon monoxide is preferred as the gas for the plasma atmosphere.

Abstract: Shaped articles of polyvinyl chloride resins containing low-molecular plasticizers are irradiated with ultraviolet light of a wavelength in the vacuum ultraviolet region to cause the shaped articles to form therein a cross linked layer capable of preventing otherwise possible exudation of plasticizers to their surface.

Abstract: The invention provides an effective method for subjecting the inner surface of a tubular body made of a plastic resin to a treatment with low temperature plasma according to which the tubular body is dipped in an insulating oil bath while the inside of the tubular body is filled with a plasma gas under a reduced pressure and electric power for the generation of a low temperature plasma is supplied to electrodes surrounding the tubular body in the insulating oil. Several of the problems in the prior art methods can be solved by the present invention such as undesirable thermal degradation of the tube surface by the evolved by the electric discharge, and power loss due to the generation of plasma outside the tubular body.

Abstract: In the inventive method, shaped articles of a plasticized polyvinyl chloride resin are subjected to the surface treatment by with low temperature plasma so that the undesirable phenomenon of bleeding of the plasticizer on the surface can be effectively prevented when the plasticizer for plasticizing the resin is a compound having at least one aromatic nucleus in a molecule or a combination of two or more of plasticizers including 10% by weight or more of a plasticizer which is a compound having at least one aromatic nucleus in a molecule.

Abstract: A novel method is proposed for preventing bleeding of plasticizers on the surface of shaped articles of plasticized polyvinyl chloride resins. The method comprises blending a limited amount of an organosilane compound represented by the general formulaCH.sub.2 .dbd.CR.sup.1 --CO--O--CH.sub.2).sub.a Si(R.sup.2).sub.b (OR.sup.3).sub.3-bin which R.sup.1 and R.sup.3 are each a hydrogen atom or an alkyl group, R.sup.2 is a monovalent hydrocarbon group, a is an integer from 1 to 6 and b is a number of 0, 1 or 2 with the polyvinyl chloride resin prior to fabrication of the resin into shaped articles, fabricating the resin admixed with the organosilane compound into a desired shaped article, and subjecting the shaped article to a treatment with low temperature plasma of a gas. Carbon monoxide is preferred as the gas for plasma atmosphere.