Abstract: A polymethylaluminoxane preparation exhibiting excellent storage stability with a high yield is provided. A polymethylaluminoxane preparation is formed by thermal decomposition of an alkylaluminum compound having an aluminum-oxygen-carbon bond, the alkylaluminum compound being formed by a reaction between trimethylaluminum and an oxygen-containing organic compound.

Abstract: A polymethylaluminoxane preparation exhibiting excellent storage stability with a high yield is provided. A polymethylaluminoxane preparation is formed by thermal decomposition of an alkylaluminum compound having an aluminum-oxygen-carbon bond, the alkylaluminum compound being formed by a reaction between trimethylaluminum and an oxygen-containing organic compound.

Abstract: In a semiconductor device having an uppermost layer wiring beneath a bump to be connected to a rewiring layer wiring, the uppermost layer wiring is formed so that the surface of a protection film covered with the uppermost layer wiring has no unevenness beneath the bump.

Abstract: An olefin polymerization catalyst is provided which makes use of a modified methylaluminoxane and thus stably exhibits an activity equivalent to, or higher than, the activity achieved by polymethylaluminoxane. Specifically, the olefin polymerization catalyst is in the form of a modified methylaluminoxane preparation prepared from: an organoaluminum compound represented by the following general formula (I): R1mAlX3-m??(I) wherein R1 represents a straight-chained or branched hydrocarbon group selected from the group consisting of alkyl, alkenyl, and aryl groups having 2 to 20 carbon atoms; X represents a hydrogen atom, halogen atom, alkoxy group, or allyloxy group; and 0<m?3; and trimethyl aluminum, wherein the mole fraction of methyl group of the aluminoxane unit with respect to the total number of moles of the hydrocarbon group having 2 to 20 carbon atoms and methyl group present in the modified methylaluminoxane preparation is 65 mol % or greater.

Abstract: In a semiconductor device having an uppermost layer wiring beneath a bump to be connected to a rewiring layer wiring, the uppermost layer wiring is formed so that the surface of a protection film covered with the uppermost layer wiring has no unevenness beneath the bump.

Abstract: An olefin polymerization catalyst is provided which makes use of a modified methylaluminoxane and thus stably exhibits an activity equivalent to, or higher than, the activity achieved by polymethylaluminoxane.

Abstract: A body member having a first fastener therein and a cover having a through hole therein removably secured by a screw member. The screw member has a head at one end, a body portion and means for engaging the said first fastener. The outer diameter of the body portion is less than the outer diameter of the head and the outer diameter of the head is slightly less than the inner diameter of the through hole. An engaging member composed of an elastic body is mounted on the body portion. The engaging member has a free diameter less than the inner diameter of the through hole. When the screw member is partially screwed into the first fastener on the body member, the cover will pass over the screw member and can be secured to the body member by tightening the screw member. As the screw member is tightened, the engaging member expands in the radius direction and engages the outer circumferential edge or the circumferential inner wall of the through hole.

Abstract: An optically active functional compound represented by the following formula (1) is disclosed: ##STR1## wherein R denotes an alkyl group having 1-14 carbon atoms; --X-- denotes ##STR2## Y denotes a single bond, ##STR3## or --O--; n=0, 1 or 2; and C* denotes an asymmetric carbon atom. The compound of the formula (1) may be produced through an optically active compound of the following formula (2) or (3): ##STR4## The compounds of the above formulas (1)-(3) are all characterized by a trifluoromethyl group providing a large spontaneous polarization attached to an asymmetric carbon atom.

Abstract: An optically active, generally mesomorphic compound represented by the following formula (I): ##STR1## wherein R.sub.1 denotes an alkyl group having 1-18 carbon atoms, R.sub.2 denotes an alkyl group having 1-12 carbon atoms; X denotes a single bond, --O--, ##STR2## Y denotes a single bond, ##STR3## --CH.sub.2 O-- or --OCH.sub.2 --; Z denotes --OCH.sub.2 --, ##STR4## C* denotes an asymmetric carbon atom; k, m and n are respectively 0, 1 or 2 with proviso that k+m+n amounts to 2 or 3; and p is 1 or 2.

Abstract: An optically active functional compound represented by the following formula (1) is disclosed: ##STR1## wherein R denotes an alkyl group having 1-14 carbon atoms; -X- denotes ##STR2## denotes a single bond, ##STR3## n=0, 1 or 2; and C* denotes an asymmetric carbon atom. The compound of the formula (1) may be produced through an optically active compound of the following formula (2) or (3): ##STR4## The compounds of the above formulas (1)-(3) are all characterized by a trifluoromethyl group providing a large spontaneous polarization attached to an asymmetric carbon atom.

Abstract: An optically active, generally mesomorphic compound represented by the following formula (I): ##STR1## wherein R.sub.1 denotes an alkyl group having 1-18 carbon atoms, R.sub.2 denotes an alkyl group having 1-12 carbon atoms; X denotes a single bond, --O--, ##STR2## Y denotes a single bond, ##STR3## --CH.sub.2 O-- or --OCH.sub.2 --; Z denotes --OCH.sub.2 --, ##STR4## respectively denotes ##STR5## C* denotes an asymmetric carbon atom; k, m and n are respectively 0, 1 or 2 with proviso that k+m+n amounts to 2 or 3; and p is 1 or 2.

Abstract: A fixing structure in which screw engagement members are applied to mating thread portions formed in a fixed member through mounting holes provided in a mounting member and having a larger diameter than the outer diameter of the screw engagement members to hold the mounting member of the fixed member, said fixing structure is characterized by the provision of engaging members of elastic material which have a free size outer diameter nearly equal to or smaller than the bore diameter of the through mounting holes of the mounting member for engaging said screw engagement members, so that the elastic engaging members radially expand as the screw engagement members move toward engagement with the fixed member to engage themselves with the outer circumference or inner wall of said through mounting holes of the mounting member for securely fixing said mounting member to said fixed member.