摘要:
According to the present invention, the method for producing toner for developing an image of electrostatic charge comprises the steps of producing a dispersion liquid of flocculated particles by forming the flocculated particles in a dispersion liquid comprising at least dispersed resin particles, forming combined particles by dispersing a liquid dispersion comprising dispersed fine resin particles into the dispersion liquid of flocculated particles so that the fine resin particles adhere to the flocculated particles and forming toner particles by fusing the combined particles by heating, wherein the molecular weight distribution curve of the resin in the toner particles by a gel permeation chromatography has at least two peaks or shoulders. According to the present invention, it is possible to produce toner for developing an image of electrostatic charge which is particularly superior in chargeability and the stability of the chargeability.
摘要:
The present invention discloses a preventive or ameliorant of hypertension or medical symptoms caused by it and a food or beverage that prevents or ameliorates hypertension or medical symptoms caused by it that contain for its active ingredient dioxabicyclo�3.3.0!octane derivative represented by the formula (2). ##STR1## wherein, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are respectively and independently a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, or R.sup.1 and R.sup.2 and/or R.sup.4 and R.sup.5 collectively represent a methylene group or ethylene group, and n, m and L represent 0 or 1.
摘要:
The present invention relates to provide a drawn optical transmission medium having excellent heat resistance and a continuous refractive index distribution in a good productivity at a low cost, and the disadvantages in a conventional synthetic resin optical transmission medium can be eliminated, which method is characterized by a step of crosslinking a polymer having a continuous refractive index gradient distributed from the peripheral portion to the central portion in its cross section and having a crosslinkable functional groups, after the step of heating and drawing.
摘要:
An air cleaner is fixed, at least at a fixing portion of the air cleaner, to a motorcar body reinforcing member which is provided in an engine room to increase the supporting rigidity of the air cleaner. The air intake duct is disposed around the reinforcing member so that the duct length can be increased and the duct can be laid out in a space-efficient manner.
摘要:
A method for producing alkylstyrene which is characterized in that 1,2-di(substituted phenyl)ethane is brought into contact with an acid catalyst at 200.degree. C. to 650.degree. C. in the presence of an inert gas to crack it into alkylstyrene and alkylbenzene. The method of the invention has advantages in that the operation of reaction and separation of reaction mixture are quite easy, the lowering of catalytic activity is small, and unreacted starting material can be reused.
摘要:
A process for selectively hydroformylating a diolefin, which comprises reacting a (1-arylethyl)vinylbenzene with carbon monoxide and hydrogen under the conditions of 40.degree. to 200.degree. C. in reaction temperature and 5 kg/cm.sup.2 or above in reaction pressure in the presence of a transition metal carbonylation catalyst to thereby selectively hydroformylating only the vinyl group and produce .alpha.-((1-arylethenyl)phenyl)propionaldehyde. The starting material to be hydroformylated may be a mixture of the (1-arylethenyl)vinylbenzene with a 1,1-di(substituted aryl)ethylene not substituted by a vinyl group.
摘要:
3-Ethylbenzophenone is prepared by oxidizing a by-product heavy oil fraction produced in the production of ethylbenzene using ZSM-5 type synthetic zeolite catalyst, without splitting carbon-to-carbon bonds. 3-Ethylbenzophenone is a starting material for synthesis of medicines, etc.
摘要:
A process for producing carbon fibers which comprises (a) treating preoxidized fibers produced from an acrylonitrile fiber with a reducing liquid containing a specific compound and (b) thereafter carbonizing or graphitizing the treated fibers at a temperature above 800.degree. C. The thus-obtained carbon or graphite fibers have a high tensile strength and a high modulus of elasticity.
摘要:
One aspect of the present invention includes a light-emitting diode (LED) power supply system. The system includes an LED regulator configured to monitor at least one LED voltage associated with a respective at least one activated LED string and to generate an LED regulation voltage based on the at least one LED voltage relative to an LED power voltage that provides power to the at least one activated LED string. The system also includes a power converter configured to generate the LED power voltage and to regulate the LED power voltage based on the LED regulation voltage.
摘要:
Methods and compositions including a compound represented by formula (I): wherein n represents an integer of from 1 to 4, RHL('s) each independently represents Cl or F, and R1 represents an alkyl group having from 8 to 20 carbon atoms.