Abstract: The preparation of vinyl chloride-type polymers by suspension polymerization of vinyl chloride monomers in the presence of monomer-soluble polymerization initiators, wherein the monomer-soluble polymerization initiators utilized are a combination of (A) a compound which possesses neither a benzene ring nor an alkoxyl group, and has a half-life of 10 hours at 0.1 mol/l concentration in benzene solution at a temperature of 40.degree.-50.degree. C., and (B) 1-cyclohexyl-1-methylethylperoxy pivalate.This method yields vinyl chloride-type polymers the qualities of which such as an initial colorization and thermal stability are effectively improved, without being affected by the limitations accompanied by the insufficient cooling capacity of the polymerization vessel in general. The preparative method further enables one to effectively avoid scale deposition in the polymerization vessel.

Abstract: A miniature diaphragm pump comprises a motor having an output shaft rotating about its axis, an eccentric pin fixed in eccentric relation to the axis of the output shaft, a drive member connected to the eccentric pin to be driven thereby to reciprocate in a direction perpendicular to the axis of the output shaft, at least one pump chamber disposed radially outwardly of the drive element with respect to the axis of the output shaft and having inlet and outlet valves. Each pump chamber has one diaphragm surface with a rigid joint rod and is connected with the drive member through the joint rod. The reciprocating motion of the drive member is transmitted to each pump chamber such that one pumping action including a compression step and an inflation step is provided to the respective pump chamber during one revolution of the eccentric pin about the output shaft.

Abstract: A constant-speed exhaust valve device has a valve body of a cylindrical shape opened at both axial ends, and a push means disposed to apply an axial compressive force to the valve body, whereby the exhaust speed of the device can be made steady and manufacturing yield of the device is made excellent.

Abstract: A process for producing a vinyl chloride polymer by polymerizing a monomer comprising vinyl chloride by suspension polymerization in a polymerization vessel on the inner wall surface of which a coating of a polymer scale preventive agent is formed, comprising the steps of applying a high-speed shearing force to a mixture comprising water, the monomer, a polymerization initiator, and (A) a dispersant comprising a partially saponified polyvinyl alcohol having a specified average degree of polymerization and a specified degree of saponification plus (B) a dispersant comprising a hydroxypropylmethylcellulose which has a specified methoxyl substitution degree, a specified hydroxypropoxyl substitution degree, and a specified viscosity and subjecting the mixture to said suspension polymerization. A vinyl chloride polymer having an average particle diameter of 200 to 600 .mu.m and a narrow particle size distribution and excellent in plasticizer take-up, etc. is provided.

Abstract: A coverlay film, which is used for protection of a flexible printed circuit board, is provided by the invention as being imparted with improved adhesiveness, heat-resistance against molten solder alloy, punching workability and other properties. The inventive coverlay film is characterized by the novel and unique formulation of the adhesive to form an adhesive layer on one surface of a substrate plastic, e.g., polyimide, film. The adhesive is formulated with an epoxy resin, carboxylated nitrile rubber, curing agent for the epoxy resin, curing accelerator and fine inorganic powder each of a specified type and in a specified weight proportion.

Abstract: A process of preparing a lower vinyl chloride polymer which comprises suspension polymerization of a vinyl chloride monomer of a mixture of unsaturated monomers consisting essentially of vinyl chloride, in an aqueous solvent, in the presence of a straight chain alkyl vinyl compound having an epoxy end terminal group represented by the formula I: ##STR1## wherein n is an integer of 2-20.

Abstract: A vinylidenefluoride-trifluoromethylethylene copolymer comprising vinylidene fluoride and trifluoromethylethylene as monomer units, said trifluoromethylethylene being contained in an amount of 0.1 to 30 mol % based on all the monomeric units in the copolymer. This copolymer is excellent in weathering resistance, corrosion resistance, electrical characteristics, and processability as well as flexibility.

Abstract: A process for producing a vinylidene fluoride copolymer, comprising the step of copolymerizing a mixture of monomers containing a polymerizable double bond comprising:(A) vinylidene fluoride, and(B) a fluorine compound represented by the formula:CH.sub.2 .dbd.CH--R.sub.f (I)wherein R.sub.f is a perfluoroalkyl group having 1 to 12 carbon atoms,with the content of (B) being 0.1 to 50% by weight, in the presence of a radical polymerization initiator. A vinylidene fluoride copolymer having excellent flexibility, impact resistance and cold resistance together with the good characteristics inherently possessed by polyvinylidene fluoride can be obtained.

Abstract: The invention relates to an electric double layer capacitor in which a metallic piece for a case at the side of an anode is formed with an aluminum layer. The aluminum layer has an electrochemically stable anodized film according to an applied voltage and has so low a resistance as not to present any practical problem. This property is effectively utilized to impart a breakdown voltage not less than 3 V to the capacitor.

Abstract: An apparatus for air-pulverizing high-temperature molten slag by blowing air at high speed through a nozzle into a flow of molten slag that is falling from an inclined container by the intermediary of a turndish. A heat detector is provided for detecting the quantity of heat in the flow of molten slag after being air-pulverized by the high speed air flow, and a feedback control device which is responsive to a detection signal issued from the detector is provided for calculating a desirable inclination angle of the container or the turndish and transmitting a control signal obtained as a result of the calculation to a controller for controlling the inclination of the container or turndish thereby stabilizing the air-pulverizing of the high-temperature molten slag.