Abstract: A vehicle wheel includes a wheel rim portion; a hub portion; a plurality of spoke portions extending radially from the hub portion to the wheel rim portion and connected to the wheel rim portion; and one or more extending portions each of which is configured to partially cover an opening portion provided between two adjacent spoke portions among the plurality of spoke portions, and to extend from the wheel rim portion toward the hub portion without contacting any of the hub portion and the plurality of spoke portions, the one or more extending portions having a thickness that is smaller than a thickness of each of the plurality of spoke portions in a cylindrical axis direction of the wheel rim portion.

Abstract: The present invention provided a high-density fuel oil comprising an isomerized product prepared by isomerizing an alicyclic saturated hydrocarbon represented by the following formula in the presence of an acid catalyst: ##STR1## wherein each of m and n is 0 or 1, and each of R.sup.1 to R.sup.3 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, but the number of the total carbons of R.sup.1 to R.sup.3 is within the range of 1 to 3.

Abstract: This invention provides a process for isolating and recovering butene-1 of high purity at high yield. Firstly, a butane-butene fraction containing 0.1 to 7 wt % of isobutylene, 10 to 50 wt % of butene-1 and 5 to 20 wt % of isobutane is rectified to reduce the content of isobutane to not more than 0.1 wt %. Then, the rectified butane-butene fraction is passed through a reactor packed with an extrusion molded silica-alumina catalyst to polymerize isobutylene at a reaction velocity as high as 50 times or more of that of butene-1, thus forming oligomers of isobutylene. Finally, the hydrocarbon mixture from the reactor is rectified to remove the oligomers of isobutylene and the other C.sub.4 -hydrocarbons.

Abstract: A selective gas separation membrane comprising a fumaric diester polymer having a repeating unit represented by the following general formula (1): ##STR1## wherein X and Y are each independently an alkyl, cycloalkyl, aryl, trialkylsilylalkyl or siloxane-containing alkyl group.

Abstract: This invention discloses a tricyclo[2.2.1.0.sup.2,6 ]heptane derivative of the general formula ##STR1## where X represents --CH.sub.2 CH.sub.2 -- or ##STR2## and R.sup.1 and R.sup.2 independently represent hydrogen or methyl, a process for preparing the same, and perfume compositions containing the same.

Abstract: The present invention is connected with a high-density liquid fuel for rockets and jet engines which mainly comprises a compound represented by the general formula ##STR1## wherein each of m and n is 0 or 1, and each of R.sup.1 to R.sup.3 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, but a sum of R.sup.1 to R.sup.3 is an integer of 1 to 3.

Abstract: Novel peroxide compounds and the use thereof. In particular, the present invention concerns .beta.-hydroxycyclopentylperoxide compounds of the general formula: ##STR1## wherein R.sub.1 represents hydrogen or an organic residue of 1 to 9 carbon atoms. These novel peroxide compounds are useful as an intermediate in the production of glutaraldehydes.

Abstract: A method of immobilizing microorganisms which comprises the steps of bringing a suspension of living cells of a microorganism into contact with a water-insoluble copolymer containing structural units derived from 2-acrylamidoethanesulfonic acid or a derivative thereof to cause the microorganism to become adsorbed on the copolymer, and bringing the water-insoluble copolymer having the microorganism adsorbed thereon into contact with a nutrient medium for the cultivation of the microorganism to increase the number of cells present on the copolymer.

Abstract: This invention discloses a method of immobilizing an enzymatically active material to a water-insoluble polyanion which comprises bringing a polycation-containing aqueous medium and the enzymatically active substance into contact with the water-insoluble polyanion having any desired form. This method is characterized in that the enzymatically active substance is adsorbed on the surfaces of the water-insoluble polyanion and, at the same time, a strong complex is formed by the interaction of the polycation and the polyanion to produce a water-insoluble film. As a result, the enzymatically active substance so adsorbed is securely fixed to the surfaces of the water-insoluble polyanion and scarcely released therefrom.

Abstract: A process for producing a water-insoluble polymer of uniform shape having high strength and a desired geometric form is disclosed. This process comprises the steps of dissolving or partially suspending in water (a) a water-soluble salt of alginic acid, (b) a hydrophilic, crosslinkable vinyl monomer having two or more radical-polymerizable vinyl groups per molecule, and (c) optionally a hydrophilic, radical-polymerizable vinyl monomer; bringing the resulting aqueous solution or suspension into contact with an aqueous solution capable of causing gelation of the water-soluble salt of alginic acid and thereby forming an water-insoluble gel of uniform shape; and subjecting the gel to radical polymerization to produce a water-insoluble polymer.

Abstract: A process is disclosed for producing alkylbenzenes by the alkylation of aromatic hydrocarbons with olefins. High reactivity and selectivity are afforded by the use of a catalyst comprising sodium and/or sodium amide deposited on a carrier represented by the formula K.sub.2 O. x Al.sub.2 O.sub.3 where x is 0.5.ltoreq.x.ltoreq.11.

Abstract: A process involves preparing an aqueous solution of a diolefin-maleic anhydride copolymer prepared by solution polymerization, said aqueous solution being free of tetramethylsuccinonitrile (TMSN), a by-product resulting from the decomposition of azobisisobutyronitrile (AIBN) used as a polymerization initiator for the copolymerization of the diolefin-maleic anhydride copolymer. The aqueous solution free of TMNS is obtained without the separation of the copolymer from the polymerization liquid in which the copolymer was prepared. The process is composed of the two distillation steps, the first distillation being for the removal of a solvent for polymerization and the second distillation being for the removal of water as well as TMSN. The first and second distillation steps can be carried out in a continuous or discontinuous manner.

Abstract: A process for preparing 4-methyl-1-pentene comprising dimerizing propylene in the presence of a catalyst, characterized in that the catalyst is composed of sodium and/or sodium amide supported on a carrier represented by the following formula K.sub.2 O.xAl.sub.2 O.sub.3 wherein x has a value in the range of 0.5.ltoreq..times..ltoreq.11. In one embodiment, the catalyst is hydrogenated prior to the use thereof.

Abstract: A process is provided for producing polyhexamethylenimine by condensing hexamethylenediamine at 50.degree. to 300.degree. C. in the presence of a palladium catalyst. The process yields substantially linear, high-molecular-weight polyhexamethylenimines, especially novel polyhexamethylenimines having a molecular weight of at least 1,000. Polyhexamethylenimines having a molecular weight of at least 500 are useful as gelling agents for organic liquids.