摘要:
A boron trifluoride complex can be recovered without changing its molar coordination ratio, by applying a direct and/or alternating voltage to an electrically-nonconductive fluid in which at least a part of boron trifluoride complex is dispersed and/or dissolved, and separating the boron trifluoride complex by settling from the electrically-nonconductive fluid. By utilizing this method for the preparation of olefin oligomer using a boron trifluoride complex catalyst, it is possible to reuse the recovered catalyst as it stands for the reaction.
摘要:
A wrinkleless plastic film having excellent quality without the reduction of width can be manufactured with high productivity using a rolling apparatus in which a plastic film is rolled stepwise at two rolling deformation points formed by two driving rolls and a follower roll, which rolls are brought into continuous contact with each other along the passage of the plastic film and said follower roll is driven by the rotation of said two driving rolls.
摘要:
A high viscosity fluid composition having a specific gravity of 1 or more, the physical properties of said fluid composition is not impaired for the use of a long period of time, and a vibration energy damping device which is filled with said high viscosity fluid composition. The high viscosity fluid composition comprises a high viscosity hydrocarbon fluid and an inorganic filler.
摘要:
A method for effectively separating and removing or recovering BF.sub.3 existing in a liquid hydrocarbon which is characterized in that an organic liquid mixture containing suspended or dissolved BF.sub.3 is brought into liquid phase contact with a synthetic polymer fiber containing nitrile groups at a temperature of 50.degree. C. or lower, so that the BF.sub.3 is adsorbed by the synthetic polymer fiber and it is then heated to 80.degree. C. or higher to recover the BF.sub.3.
摘要:
A device for transversely stretching a web includes a pair of pulleys arranged in the substantially same plane and rotating in the opposite directions to each other and a pair of belts running around the pulleys, respectively. The web is widthwise stretched, by gripping opposite side edges thereof by the pulleys and the belts and conveying the web in a divergent manner. At least one pair of pressing rolls are provided at an inclination relative to the belts for pressing the opposite side edges of the web onto the belts prior to being gripped between the pulleys and the belts. According to this structure, a device for transversely stretching a web is realized which is capable of effectively preventing the web from being dropped from the grip.
摘要:
The object of the present invention is to provide a nonwoven fabric which is excellent in bulkiness and touch feeling as well as strength and dimensional stability and to provide a method for producing the above nonwoven fabric through a simple and convenient manner without employing any particular spinning device. The invention relates to a bulky nonwoven fabric composed of a stretched filament web which is prepared from either at least one layer of a stretched unidirectionally arranged filament web which is composed of almost unidirectionally arranged long fibers being stretched and shrunk or a stretched crosswise laminated filament web made of two or more layers of the stretched unidirectionally arranged filament webs and a short fiber web which is entangled with said stretched filament web and is crimped as a result of shrinkage of the long fibers, and a method for producing the same.
摘要:
A web spreading apparatus for transversely spreading a web, such as a split web formed of a longitudinally uniaxially stretched film, includes a spreading means arranged in a travelling path of the web for transversely spreading the web. The spreading means comprises a curved rod-like member and projections arranged generally circumferentially about an axis of the curved rod-like member. The curved rod-like member is arranged so that the concave side is directed forward and the convex side is directed rearward, in the web travelling direction, and the projections are rotatable about the axis of the curved rod-like member at a speed higher than the travelling speed of the web. In one aspect, the curved rod-like member comprises a curved shaft and an outer tube arranged about the curved shaft and rotatable relative to the curved shaft, the projections being formed between the grooves cut on the outer tube. In another aspect, the projections are formed of a spring arranged about the curved rod-like member.
摘要:
In the polymerization of olefins using a catalyst comprising an organoaluminum compound and solid catalyst components containing titanium and/or vanadium; and magnesium in a vapor phase fluidized bed, the formation of sheet-like polymer and other abnormal conditions in the initial stage of the polymerization are avoided by means of previous drying of the reactor by feeding an organoaluminum compound prior to the feeding of seed polymer, the quantity of said organoaluminum compound being calculated by the following equation (I):A=k.multidot.V.sup. 2/3 (I)wherein A is the feed quantity (mol) of the organoaluminum compound, k is a coefficient (mol/m.sup.2) in the range from 0.15 to 4, and V is the volume (m.sup.3) of the whole system including gas circulation pipings.
摘要:
A method for the photodynamic therapy of rheumatoid arthritis of mammals, which agent comprises at least one member of fluorescent compounds selected from the group consisting of tetrapyrrole carboxylic acids having at least one carboxyl group, corresponding di- or tetrahydrotetrapyrrole carboxylic acids, and mono-, di- or polyamides of the tetrapyrrole carboxylic acids with amino-mono- or dicarboxylic acids and their salts.
摘要:
A process for producing polyolefin with a vapor-phase fluidized-bed reactor, wherein the reaction is started after filling the reactor with particles which contain moisture and/or molecular oxygen and can form a fluidized bed in order to prevent the formation of molten resin which is liable to occur at the start of the reaction and to attain a smooth operation of the reactor.