Abstract: The novel transition metal compound of the invention is represented by the following formula (I): ##STR1## wherein M is a transition metal; R.sup.1 and R.sup.2 are each a hydrogen atom, a hydrocarbon group or the like; R.sup.3 is an alkyl group of 2 to 20 carbon atoms; R.sup.4 is an alkyl group of 2 to 20 carbon atoms; X.sup.1 and X.sup.2 are each a halogen atom or the like; and Y is a divalent hydrocarbon group, a divalent silicon-containing group or the like. The transition metal compound is useful for an olefin polymerization catalyst with which a propylene (co)polymer having specific structure is prepared.

Abstract: An irrigation hose provides a long life expectancy. The irrigation hose is characterized in that a plurality of flow passages are defined by partitions dividing the inside of the hose which is made of thermoplastic resin; and that each flow passage is provided with irrigation holes formed in a member of the tube portion which is in contact with outside air, that is the outer wall thereof. The irrigation hose can provide different irrigation methods appropriate to the crops or growth stages with just one hose, without exchanging or laying multiple hoses with different irrigation methods. A film 16 is inserted between a film 12 which is made of long thermoplastic resin film with irrigation holes formed throughout at regular pitch and another film 12 which is also made of a long thermoplastic resin film with irrigation holes on both sides.

Abstract: A heat-resistant rubber composition of the invention is a vulcanizable composition comprising a specific ethylene-.alpha.-olefin-nonconjugated polyene copolymer rubber (A) and an organic peroxide (B). This heat-resistant composition has high crosslinking efficiency given by the organic peroxide and high modulus, and can provide a vulcanized rubber molded product of excellent resistance to environmental deterioration such as thermal aging resistance. The other heat-resistant rubber composition of the invention is a vulcanizable composition comprising 100 parts by weight of a specific ethylene-.alpha.-olefin-nonconjugated polyene copolymer rubber (A) composed of ethylene, an .alpha.-olefin or 3 to 20 carbon atoms and a nonconjugated polyene which is a vinyl end group-containing norbornene compound, 0.2 to 5 parts by weight of an amine type anti-aging agent (C) and/or a hindered phenol type anti-aging agent (D), 1 to 10 parts by weight of a sulfur type anti-aging agent (E) and an organic peroxide (B).

Abstract: An ethylene polymer having small values of Mw/Mn and Mz/Mw, a small proportion of long-chain branches and a high swell ratio and a process for preparing the polymer are disclosed. A solid titanium catalyst component obtained by initially contacting a solid titanium composite containing titanium, magnesium, halogen and a compound having at least two ether linkages present through plural atoms with an organometallic compound and then contacting the resulting product with oxygen is further disclosed. An ethylene polymerization catalyst comprising the above catalyst component and an organometallic compound catalyst component is furthermore disclosed. The ethylene polymer is excellent in moldability, and from this polymer, a molded article which is excellent in rigidity and impact resistance and free from poor appearance can be obtained. By the use of the ethylene polymerization catalyst, an ethylene polymer having excellent properties as mentioned above can be obtained.

Abstract: Disclouse is an olefin thermoplastic elastomer foamed product obtained by heating a foamable composition comprising a partially crosslinked thermoplastic elastomer composition (A), a specific olefin plastic (B) and a foaming agent (C) in specific proportions. The partially crosslinked thermoplastic elastomer (A) is obtained by dynamically heat-treating a mixture in the presence of organic peroxide, said mixture comprising specific proportions of a peroxide-crosslinkable copolymer rubber (a), which is a specific ethylene/.alpha.-olefin/nonconjugated diene copolymer rubber, and a peroxide-decomposable olefin plastic (b), which is a (co)polymer containing 50 to 100% by mol of an .alpha.-olefin of 3 to 20 carbon atoms and has a specific MFR. The olefin plastic (B) is a (co)polymer containing 50 to 100% by mol of an .alpha.-olefin of 2 to 20 carbon atoms and has a specific MFR. Also disclosed is a process for preparing the olefin thermoplastic elastomer foamed product.

Abstract: At least one convex (or concave) arcuate face is formed by photolithography on a photoresist film formed on a surface of an optical device made of an optical material. The surface of the optical device and the photoresist film are etched to form, on the surface of the optical device, at least one convex (or concave) arcuate face similar to the convex (or concave) arcuate face formed on the photoresist film. After the surface of the optical material is mirror face polished, a photoresist film is formed on the polished surface, and the polished surface and the photoresist film are etched uniformly. An optical device obtained in this manner is used for a laser oscillator, a monolithic laser system, a nonlinear optical device, a microlens, a ring laser and so forth. Further, a plurality of reflecting portions are provided on a pair of opposing surfaces of a light transmitting optical material. At least one of the opposing surfaces is formed on the convex arcuate face.

Abstract: A solid titanium catalyst component ?Ia! containing magnesium, halogen, titanium and a compound having at least two ether linkags with a plurality of intermediately existing bonding atoms; a catalyst and a prepolymerized olefin-containing catalyst prepared by using the solid titanium catalyst component ?Ia!; a method for preparing a polyolefin wherein said catalyst or prepolymerized olefin containing catayst is used. A catalyst and a prepolymerized olefin containing catalyst prepared by using a solid titanium catalyst component ?Ib! containing magnesium, halogen, titanium and a specific electron donor (a1), and a compound having at least two ether linkags with a plurality of intermediately existing bonding atoms; a method for preparing a polyolefin wherein said catalyst or prepolymerized olefin containing catayst is used.

Abstract: There is provided a carboxylic acid compound represented by the following formulae (I) to (IV): ##STR1## a liquid crystal material consisting of the carboxylic acid ester compound, a liquid crystal composition comprising the carboxylic acid ester compound, and a liquid crystal element using the carboxylic acid ester compound. There can be obtained advantages such as low operating temperature, high speed switching, very small electric power consumption, and high-stable contrast.

Abstract: A squeezable tubular container (a) which is formed from a composition containing a polyethylene having a density of 0.900 to 0.975 g/cm.sup.3 and an ethylene/.alpha.-olefin copolymer having a density smaller than 0.900 g/cm.sup.3, (b) has a crosslinking caused under irradiation with electron beam, and (c) is sterilizable at a high temperature or is heat-sealable or ultrasonically sealable; and a process for the production thereof.

Abstract: Disclosed is a liquid crystal device comprising a liquid crystal cell filled with a liquid crystal material capable of exhibiting a smectic phase, said cell including upper and lower substrates each having in order an electrode and an orientation film in contact with the liquid crystal material, a cross angle .THETA. formed by the orientation treatment directions of the orientation films is 180.degree.-.delta. or 360.degree.-.delta. (0.degree.<.delta..ltoreq.90.degree.). Also disclosed is a process for preparing the above-mentioned liquid crystal device comprising treating the orientation films and preparing the liquid crystal cell so as to have the orientation treatment directions of the orientation films form the cross angle .THETA. within the above range in the cell.

Abstract: The novel transition metal compound of the invention is represented by the following formula (I): ##STR1## wherein M is a transition metal; R.sup.1 is a hydrocarbon group of 2 to 6 carbon atoms, R.sup.2 is an aryl group of 6 to 16 carbon atoms; X.sup.1 and X.sup.2 are each a halogen atom or the like; and Y is a divalent hydrocarbon group, a divalent silicon-containing group or the like. An olefin polymerization catalyst component of the present invention comprises the aforementioned transition metal compound.

Abstract: Striped electrodes are formed on upper and lower substrates respectively, and a plurality of partition members are formed in a striped fashion so that a plurality of parallel sealed linear interstices R, each having a rectangular section, are formed between the substrates. A upper-side rubbing direction crosses a lower-side rubbing direction at a predetermined angle, and the direction of extension of each of the partition members is caused to fall within the above cross angle. An antiferroelectric liquid crystal is sealed in the linear interstices, and the liquid crystal panel is cooled while proceeding from one end of the linear interstices to the other end thereof. The layer normal direction of liquid crystal molecular layer becoming irregular between the upper and lower substrates is prevented by the employment of the cross rubbing method to thereby avoid the occurrence of defects in the liquid crystal.

Abstract: A multilayer laminate film comprising (A) a first layer comprising a propylene polymer and oriented in at least one direction, (B) a second layer comprising a propylene copolymer having a melting point lower than the melting point of the propylene polymer of the first layer, (C) a third layer comprising a polymer composition comprising a graft modified olefin polymer in which an unsaturated carboxylic acid or a derivative thereof is grafted, and (D) a fourth layer comprising an ethylene vinyl alcohol copolymer, these four layers being laminated in the above order. The above multilayer laminate exhibits excellent interlaminar adhesion and has excellent heat resistance.

Abstract: The container according to the invention is composed of a saturated polyester resin composition comprising a saturated polyester ?A! in an amount of 50 to 95 parts by weight, a metallic salt of an ethylene/unsaturated carboxylic acid copolymer ?B! in an amount of 0.5 to 20 parts by weight, a modified ethylene/.alpha.-olefin copolymer rubber ?C! in an amount of 0.5 to 30 parts by weight, a benzotriazole type weathering stabilizer ?D! in an amount of 0.01 to 2.0 parts by weight and a hindered amine type weathering stabilizer ?E! in an amount of 0 to 2.0 parts by weight, and if necessary, a carbodiimide compound ?F! in an amount of 0.01 to 5.0 parts by weight, the amounts of said components ?D!, ?E! and ?F! being each based on 100 parts by weight of the total amounts of the components ?A!, ?B! and ?C!. The container of the invention is excellent in not only low-temperature impact strength but also rigidity, weld strength, weathering resistance and fade resistance.

Abstract: In accordance with the present invention, there are provided ethylene copolymers composed of structural units (a) derived from ethylene and structural units (b) derived from .alpha.-olefin of 3.about.20 carbon atoms, said ethylene copolymers having?A! a density of 0.85.about.0.92 g/cm.sup.3,?B! an intrinsic viscosity ?.eta.! as measured in decalin at 135.degree. C. of 0.1.about.10 dl/g,?C! a ratio (Mw/Mn) of a weight average molecular weight (Mw) to a number average molecular weight (Mn) as measured by GPC of 1.2.about.4, and?D! a ratio (MFR.sub.10 /MFR.sub.2) of MFR.sub.10 under a load of 10 kg to MFR.sub.2 under a load of 2.16 kg at 190.degree. C. of 8.about.50, and being narrow in molecular weight distribution and excellent in flowability.

Abstract: A process for polymerizing propylene utilizes a metallocene catalyst component of the formula (I) ##STR1## wherein M is a transition metal, R.sup.1 is a C.sub.2-6 hydrocarbon, R.sup.2 is a C.sub.6-16 aryl group, X.sup.1 and X.sup.2 are each a halogen atom and Y is a divalent hydrocarbon or a divalent silicon-containing group. Propylene polymers produced thereby have such properties that the triad tacticity of propylene units is high, the proportion of inversely inserted units based on the 2,1-insertion of propylene monomer is in a specific range and the intrinsic viscosity (.eta.), as measured in decahydronaphthalene at 135.degree. C., is in a specific range.

Abstract: A graft-modified ethylene/.alpha.-olefin copolymer composition is prepared by graft copolymerizing an ethylene/.alpha.-olefin copolymer. The ethylene/.alpha.-olefin copolymer composition includes first and second ethylene/.alpha.-olefin copolymers. The copolymers are each prepared in the presence of a polymerization catalyst containing (a) an organoaluminum oxy compound and (b) for the first ethylene/.alpha.-olefin copolymer at least two kinds, and for the second ethylene/.alpha.-olefin copolymer one kind, of compounds of Group IV transition metals of the periodic table containing a ligand having a cyclopentadienyl skeleton. The ethylene/.alpha.-olefin copolymer composition may be blended with a polyolefin by mechanical or solution blending. The copolymer compositions have excellent moldability and heat stability properties and forms films having high transparency and mechanical strength.

Abstract: The novel propylene homopolymer and copolymer produced by using a catalyst which is represented by the following formula (I): ##STR1## wherein M is a transition metal; R.sup.1 is a hydrocarbon group of 2 to 6 carbon atoms, R.sup.2 is an aryl group of 6 to 16 carbon atoms; X.sup.1 and X.sup.2 are each a halogen atom or the like; and Y is a divalent hydrocarbon group, a divalent silicon-containing group or the like.

Abstract: Olefin thermoplastic elastomers which comprise a partially crosslinked thermoplastic elastomer comprising a crystalline polyolefin resin (A), a block copolymer (B) which is composed of a polymer block of styrene or its derivative and a specific isoprene polymer block, and an olefin rubber (C), and thermoplastic elastomer laminates, having a substrate formed from a specific olefin thermoplastic elastomer or a crystalline polyolefin resin and a skin layer formed from the above-mentioned olefin thermoplastic elastomer, which are excellent in mechanical strength, heat resistance, heat aging resistance, weathering resistance and scratch resistance have been provided by the present invention.

Abstract: Disclosed are a catalyst for olefin polymerization comprising (A) a compound of a transition metal in Group IVB of the periodic table which contains a ligand having a cyclopentadienyl skeleton, (B) an organoaluminum compound and any one of (C1) a Br.o slashed.nsted acid; (C2) a material obtained by contacting (c-1) a magnesium compound with (c-2) an electron donor; and (C3) a material obtained by contacting (c-1) a magnesium compound, (c-2) an electron donor and (c-3) an organometallic compound with each other. Also disclosed are processes for polymerizing an olefin in the presence of the above-mentioned catalysts for olefin polymerization. Such catalysts and processes for olefin polymerization as described above are excellent in olefin polymerization activity and economical efficiency.