Abstract: A process for producing an .alpha.-olefin polymer which comprises polymerizing an .alpha.-olefin in the presence of a catalyst system comprising(A) a solid catalyst component containing at least titanium, magnesium, halogen, and electron donor and(B) a sterically hindered aluminum amide compound represented by the general formula ##STR1## wherein, R.sup.1 through R.sup.5 denote each a hydrocarbon group of 1 to 20 carbon atoms, L denotes an alkoxy group of 1 to 20 carbon atoms and/or halogen, l is 2 or 3, x is defined by 0<x<1, y is defined by 0.ltoreq.y<3, and z is defined by 0<z<3 with the proviso that x+y+z=3.

Abstract: A process for producing an .alpha.-olefin polymer which comprises polymerizing an .alpha.-olefin in the presence of a catalyst system comprising(A) a solid catalyst component containing at least titanium, magnesium, halogen, and electron donor and(B) a sterically hindered aluminum amide compound represented by the general formula ##STR1## wherein, R.sup.1 through R.sup.5 denote each a hydrocarbon group of 1 to 20 carbon atoms, L denotes an alkoxy group of 1 to 20 carbon atoms and/or halogen, l is 2 or 3, x is defined by 0<x<1, y is defined by 0.ltoreq.y<3, and z is defined by 0<z<3 with the proviso that x+y+z=3.

Abstract: A semiconductor integrated circuit memory structure is provided which uses macro-cellulated circuit blocks that can permit a very large storage capability (for example, on the order of 64 Mbits in a DRAM) on a single chip. To achieve, this, a plurality of macro-cellulated memory blocks can be provided, with each of the memory blocks including a memory array as well as additional circuitry such as address selection circuits and input/output circuits. Other peripheral circuits are provided on the chip which are common to the plurality of macro-cell memory blocks. The macro-cell memory blocks themselves can be formed in an array so that their combined storage capacity will form the large overall storage capacity of the chip. The combination of the macro-cell memory blocks and the common peripheral circuitry for controlling the memory blocks permits a faster and more efficient refreshing operation for a DRAM. This is enhanced by a LOC (Lead On Chip) arrangement used in conjunction with the memory blocks.

Abstract: A process for producing an .alpha.-olefin polymer which comprises homopolymerizing or copolymerizing an .alpha.-olefin by the use of a catalyst system comprising:(A) a solid catalyst component (A) containing at least magnesium, titanium, halogen and ester compound as indispensable components, and(B) a catalyst component (B) produced by reacting an organoaluminum compound represented by general formula R.sup.1.sub.m AlY.sub.3-m (R.sup.1 represents an aliphatic hydrocarbon group having 1 to 8 carbon atoms, Y represents halogen, hydrogen or alkoxy group having 1 to 20 carbon atoms, and m represents a number satisfying 2.ltoreq.m.ltoreq.3) with an organic silicon compound represented by general formula R.sup.2.sub.n Si(OR.sup.3).sub.4-n (R.sup.2 represents alicyclic hydrocarbon group or aromatic hydrocarbon group having 5 to 20 carbon atoms, R.sup.3 represents a hydrocarbon group having 1 to 20 carbon atoms, and n represents a number satisfying 0.ltoreq.n.ltoreq.

Abstract: A static RAM memory is divided into a plurality of mats (12). Word lines (16) in each pair of mats are accessed by an x-decoder (14). Columns or bit lines are accessed by a y-decoder (20) which selectively connect pairs of bit lines (22) to common data bus segments (24). Transistors (60, 62) connect selected bit lines with a load during a write cycle to stabilize those bit lines and memory cells into which data is written. The x-decoders are connected with near word lines (16a) for addressing a near half of each mat and are operatively connected with remote word lines (16b) for addressing word lines in a remote half of each mat. In this manner, each mat is divided into two effective mats. The bit lines of all the effective mats within an actual mat are connected with the same output data bus segment. A pair of sensing amplifiers (32) is provided for each bit of memory which is accessed concurrently, e.g. eight bits, such that the high and low output of each flip-flop memory cell (18) are both amplified.

Abstract: An olefin polymerization catalyst comprising:(A) a solid catalyst component containing a trivalent titanium, which is represented by the composition formulaMg.sub.m Ti(OR).sub.n X.sub.p [ED].sub.q(wherein R is a hydrocarbon group having 1 to 20 carbon atoms, X is a halogen, ED is a electron donative compound, and m, n, p and q are each a number satisfying 1.ltoreq.m.ltoreq.51, 0<n.ltoreq.5, 5.ltoreq.p.ltoreq.106 and 0.2.ltoreq.q.ltoreq.2) obtained by reducing a titanium compound represented by the general formula Ti(OR.sup.1).sub.a X.sub.4-a (wherein R.sup.1 is a hydrocarbon group having 1 to 20 carbon atoms, X is a halogen atom and a is a number satisfying 0<a.ltoreq.

Abstract: A solid-catalyst component for use in the polymerization of .alpha.-olefins obtained byreducing a titanium compound represented by the following general formula:Ti(OR.sup.1).sub.n x.sub.4-nwherein R.sup.1 represents a hydrocarbon group having 1 to 20 carbon atoms, X represents a halogen atom and n represents a number satisyfing 0<n.ltoreq.4, with an organomagnesium compound in the presence of an organic silicon compound having Si--O bond to produce a solid product,treating the solid product with an ester compound,treating the ester-treated solid product with a mixture of an ether compound and titanium tetrachloride or with a mixture of an ether compound, titanium tetrachloride and an ester compound to obtain a trivalent titanium compound-containing solid catalyst precursor, andtreating the solid catalyst precursor with a small quantity of an olefin in the presence of an organoaluminum compound to obtain a solid catalyst component for use in the polymerization of .alpha.-olefins.

Abstract: A liquid catalyst component for copolymerization of ethylene with .alpha.-olefin comprising a titanium compound represented by the following general formula:(R.sup.1 R.sup.2 N).sub.4-(m+n) TiX.sub.m Y.sub.nwherein R.sup.1 and R.sup.2 each represents a saturated hydrocarbon group having 8 to 30 carbon atoms; X represents halogen; Y represents an alkoxy group; m represents a number satisfying 1.ltoreq.m.ltoreq.3; n represents a number satisfying 0.ltoreq.n.ltoreq.2; and (m+n) satisfies 1.ltoreq.(m+n).ltoreq.3.Said liquid catalyst component is used in combination with an organoaluminum compound as a catalyst system for copolymerization of ethylene with .alpha.-olefin.

Abstract: An olefin polymerization catalyst comprising:(A) a solid catalyst component containing a trivalent titanium, which is represented by the composition formulaMg.sub.m Ti(OR).sub.n X.sub.p [ED].sub.q(wherein R is a hydrocarbon group having 1 to 20 carbon atoms, X is a halogen, ED is a electron donative compound, and m, n, p and q are each a number satisfying 1.ltoreq.m.ltoreq.51, 0<n.ltoreq.5, 5.ltoreq.p.ltoreq.106 and 0.2.ltoreq.q.ltoreq.2) obtained by reducing a titanium compound represented by the general formula Ti(OR.sup.1).sub.a X.sub.4-a (wherein R.sup.1 is a hydrocarbon group having 1 to 20 carbon atoms, X is a halogen atom and a is a number satisfying 0<a.ltoreq.

Abstract: A solid catalyst component for .alpha.-olefin polymerization containing as catalyst components at least titanium, magnesium and chlorine which are impregnated into an organic porous polymer carrier having a mean particle diameter of 5 to 1,000 .mu.m and a pore volume of 0.1 ml/g or above at a pore radius of 100 to 5,000 .ANG., a catalyst system comprising at least said solid catalyst component (A) and an organoaluminum compound (B), as well as a process for producing .alpha.-olefin polymers using said catalyst system.

Abstract: A liquid catalyst component for copolymerization of ethylene with .alpha.-olefin comprising a titanium compound represented by the following general formula:(R.sup.1 R.sup.2 N).sub.4-(m+n) TiX.sub.m Y.sub.nwherein R.sup.1 and R.sup.2 each represents a saturated hydrocarbon group having 8 to 30 carbon atoms; X represents halogen; Y represents an alkoxy group; m represents a number satisfying 1.ltoreq.m.ltoreq.3; n represents a number satisfying 0.ltoreq.n.ltoreq.2; and (m+n) satisfies 1.ltoreq.(m+n).ltoreq.3.Said liquid catalyst component is used in combination with an organoaluminum compound as a catalyst system for copolymerization of ethylene with .alpha.-olefin.

Abstract: A catalyst system comprising(A) a halogen compound of trivalent titanium,(B) an organo-aluminum compound of the formula,R.sub.3-(m+n) AlY.sub.m X.sub.nwhereinY is a group having at least one of oxygen, nitrogen, sulfur and phosphorus atoms linked to the aluminum atom, R is a hydrogen atom, an alkyl having 1 to 18 carbon atoms, an alkenyl having 2 to 18 carbon atoms, a cycloalkyl having 3 to 18 carbon atoms, an aryl having 6 to 18 carbon atoms, or an aralkyl having 7 to 18 carbon atoms,X is a halogen atom, and m and n are numbers satisfying the equations, 0<m<1, 0.ltoreq.n<2, 0<m+n.ltoreq.2, and(C) an electron-donor, and a method for producing an olefin polymer which comprises polymerizing olefins using said catalyst system. According to this method, highly crystalline olefin polymers having a broad melecular weight distribution can be produced.

Abstract: A process for producing a highly stereospecific .alpha.-olefin polymer which comprises homopolymerizing or copolymerizing an .alpha.-olefin or copolymerizing an .alpha.-olefin with ethylene by the use of a catalyst system comprising:(A) a solid catalyst component containing a trivalent titanium compound obtained by reducing a titanium compound represented by the following general formula:Ti(OR.sup.1).sub.n X.sub.4-n(R.sup.1 represents a hydrocarbon group having 1 to 20 carbon atoms, X represents a halogen atom and n represents a number satisfying 0<n.ltoreq.

Abstract: A process for producing a trivalent titanium compound-containing solid catalyst for use in the polymerization of olefins which comprises treating, with an ester compound, a solid product obtained by reducing a titanium compound represented by the following general formula: ##STR1## (R.sup.1 represents hydrocarbon group having 1 to 20 carbon atoms, X represents halogen atom, and n represents a number satisfying 0<n.ltoreq.4) with an organomagnesium compound in the presence of an organic silicon compound having Si--O bond, and thereafter treating it with a mixture of an ester compound and titanium tetrachloride.

Abstract: This invention provides an overlock sewing machine with a threading mechanism that is both easier and more efficient to use. As shown in FIGS. 1 and 7, the overlock sewing machine has a vertically movable needle (6, 106), a looper carriage (18, 118) connected to a rotating shaft, and a looper (11, 111) on the end of the looper carriage. The looper extends laterally over the looper carriage and has a thread-receiving eye (11a, 111a). The looper and the needle cooperate to form a chain stitch. As shown in FIGS. 3 and 9, a thread-guiding member (25, 125) next to the looper pivots with the looper to guide a thread LT through the thread-receiving eye. A movable lever (30, 130) pivots with or relative to the looper. A thread-delivering member (39, 139) mounted on the movable lever that can be set in two positions: a first position corresponding to a first position of the thread-receiving eye, and a second position corresponding to the thread-guiding member.

Abstract: In a defect relieving technology which replaces defective memory cells of a semiconductor memory device by spare memory cells, use is made of an associative memory. Address information of a defective memory cell is stored as a reference data of the associative memory, and new address information of a spare memory cell is written down as output data of the associative memory. A variety of improvements are made to the associative memory. For instance, a plurality of coincidence detection signal lines of the associative memory are divided into at least two groups, and one group among them is selected by switching means. Reference data of the associative memory comprises three values consisting of binary information of "0" and "1", and don't care value "X". The associative memory further includes a plurality of electrically programable non-volatile semiconductor memory elements.

Abstract: A solid catalyst component for olefin polymerization which comprises a catalyst component comprising at least titanium and chlorine fixed onto a porous substance of which the pore volume, at a pore radius in a range of from 200 to 2,000 .ANG., is 0.3 cc/g or more, said pore volume is 35% or more of the pore volume at a pore radius in a range of from 35 to 75,000 .ANG., the average particle diameter is from 5 to 300 .mu.m, the geometrical standard deviation of the particle size distribution is 2 or less and the solubility in toluene at 100.degree. C. is 30 wt. % or less.

Abstract: A semiconductor memory device is disclosed, in which a word line address translation unit, a data line address translation unit, a first spare memory and a second spare memory are provided in addition to a main memory to relieve a defective memory cell in the main memory. Spare word line address signals for selecting a spare word line on the first spare memory are written in the word line address translation unit, spare data line address signals for selecting a spare data line on the second spare memory are written in the data line address translation unit, and each of the word line address translation unit and the data line address translation unit is constructed of an ordinary semiconductor memory of the multi-bit output type.

Abstract: A static RAM memory is divided into a plurality of mats (12). Word lines (16) in each pair of mats are accessed by an x-decoder (14). Columns or bit lines are accessed by a y-decoder (20) which selectively connect pairs of bit lines (22) to common data bus segments (24). Transistors (60, 62) connect selected bit lines with a load during a write cycle to stabilize those bit lines and memory cells into which data is written. The x-decoders are connected with near word lines (16a) for addressing a near half of each mat and are operatively connected with remote word lines (16b) for addressing word lines in a remote half of each mat. In this manner, each mat is divided into two effective mats. The bit lines of all the effective mats within an actual mat are connected with the same output data bus segment. A pair of sensing amplifiers (32) is provided for each bit of memory which is accessed concurrently, e.g. eight bits, such that the high and low output of each flip-flop memory cell (18) are both amplified.

Abstract: A solid catalyst component for olefin copolymerization containing trivalent titanium compound, which is obtained by reducing a titanium compound represented by the general formula Ti(OR.sup.1).sub.n X.sub.4-n (wherein R.sup.1 is a hydrocarbon group of 1 to 20 carbon atoms, X is a halogen atom, and n is a number satisfying 0<n.ltoreq.4) with an organomagnesium compound in the presence of a porous carrier having a pore volume of, at pore radius of 50 to 5,000 .ANG., at least 0.2 ml/g, or in the presence of an organosilicon compound having at least one Si-O bond and the porous carrier to obtain a solid product, treating the solid product with a mixture of an ether compound and titanium tetrachloride, a catalyst system for olefin copolymerization comprising the above-mentioned solid catalyst component and an organoaluminum compound, as well as a process for olefin copolymerization using said catalyst system.