摘要:
There are disclosed, a polyether ketone having a primary particle size of 50 μm or less; and a method of producing a polyether ketone by a desalting polycondensation, which contains a step of conducting a polymerization reaction under a condition of deposition of the polymer. The polyether ketone obtained by the present invention has small particle size, high molecular weight and sufficiently small content of impurities such as alkali metal components.
摘要:
There are disclosed, a polyether ketone having a primary particle size of 50 μm or less; and a method of producing a polyether ketone by a desalting polycondensation, which contains a step of conducting a polymerization reaction under a condition of deposition of the polymer. The polyether ketone obtained by the present invention has small particle size, high molecular weight and sufficiently small content of impurities such as alkali metal components.
摘要:
An improvement is provided in and relating to a capacitance-type record medium wherein an information signal is recorded as a variation in the geometrical shape of its surface area, and is played back by the variation of the capacitance between its surface and an electrode of a reproducing stylus scanning the surface of the record medium relatively which occurs according to a variation in the geometrical shape of its surface area. The improvement consists in the fact that at least the surface area of the record medium is formed of (1) a material composed of an electrically conductive substance and a copolymer consisting of 98 to 65% by weight of vinyl chloride, 2 to 20% by weight of an alkyl vinyl ether with the alkyl group having 4 to 18 carbon atoms and/or a vinyl ester of a fatty acid in which the fatty acid residue has 4 to 18 carbon atoms and 0 to 15% by weight of another monomer copolymerizable with these compounds, or (2) a material composed of an electrically conductive substance and a polymer mixture consisting of at least two polymers in which the proportions of the constituent monomers are the same as in the aforesaid copolymer.
摘要:
A recording medium printed out by an image forming section is ejected to an ejection unit provided at an upper portion of an image forming apparatus. This ejection unit owns an inclination portion which is obliquely formed and has both a lower edge and an upper edge. At least a portion of a developer storage space is arranged in an area “A” which is surrounded by this inclination portion, a horizontal plane extended from the lower edge of the inclination portion, and also, a vertical plane extended from the upper edge of the inclination portion.
摘要:
A container for semiconductor chips is disclosed. The container includes an annular ring having a first diameter and an annular lower casing having a second diameter, greater than the first diameter. The annular lower container houses the annular ring. A plastic film, holding the semiconductor chips, is stretched over an annular opening in the annular ring. An upper container mates with the lower container to form an air-tight housing for the annular ring. The upper container is shaped in such a manner that the upper container fixes the annular ring in place but does not contact the semiconductor chip.
摘要:
A modified phenolic resin that is an alternate copolymer of at least one phenolic compound selected from phenol, naphthols, and their derivatives and a compound having a divalent connecting group, said modified phenolic resin having a side chain attached to an aromatic ring having a hydroxy group, said side chain being represented by defined formula (1-1). The modified phenolic resin can be used as a hardener for epoxy resins and a cured product thereof has excellent adhesion and flame retardancy without impairing properties of conventional phenolic resins such as gel time, glass transition temperature, moisture absorption, and mechanical properties. The epoxy resin composition can provide excellent adhesion and flame retardancy as hardeners for semiconductor sealing epoxy resins, insulating materials for electrical/electronic components, and laminates (printed circuit boards). A prepreg containing a glass substrate impregnated with the epoxy resin composition, a laminate, and an electronic circuit board are also provided.
摘要:
A recording medium supplied from any one of paper supply units is printed by an image forming section, and then, the image-formed recording medium is transported via a transport path which is formed along a vertical direction, and thereafter is ejected to an ejection unit which is provided at an upper portion of an image forming apparatus main body. While a developing apparatus of a process cartridge owns a developer storage space, a latent image writing position “P” of an image carrier optically written by an optical writing apparatus is located lower than at least a portion of this developer storage space, and a space defined between the paper supply unit 18a and the optical writing apparatus is made small.
摘要:
The modified phenolic resin of the present invention has a specific structure in which a side chain of an aromatic ring having a hydroxyl group in a phenolic resin that is an alternate copolymer of a phenolic compound and a compound having a divalent connecting group, is substituted with a group represented by general formula (1-1). By using the modified phenolic resin as a hardener for epoxy resins, there are provided an epoxy resin, a composition thereof, and a cured product thereof having excellent adhesion and flame retardancy without impairing properties of conventional phenolic resins such as gel time, glass transition temperature, moisture absorption, and mechanical properties. (In the formula, R1 represents a C1-8 linear, branched, or cyclic hydrocarbon group.) The present invention provides an epoxy resin composition with excellent adhesion and flame retardancy in uses such as hardeners for semiconductor sealing epoxy resins, insulating materials for electrical/electronic components, and laminates (printed circuit boards). A prepreg containing a glass substrate impregnated with the epoxy resin composition, a laminate, and an electronic circuit board are also provided.
摘要:
A recording medium supplied from any one of paper supply units is printed by an image forming section, and then, the image-formed recording medium is transported via a transport path which is formed along a vertical direction, and thereafter is ejected to an ejection unit which is provided at an upper portion of an image forming apparatus main body. While a developing apparatus of a process cartridge owns a developer storage space, a latent image writing position “P” of an image carrier optically written by an optical writing apparatus is located lower than at least a portion of this developer storage space, and a space defined between the paper supply unit 1 8a and the optical writing apparatus is made small.
摘要:
An image forming apparatus has a latent image forming unit for forming a latent image on an image carrying body and a developing unit for visualizing the latent image formed on the image carrying body by using a developer. In the image forming apparatus, for the developing unit, a developer replenishment box is communicatively connected to a developing housing in which a developer is contained, and the developer replenishment box is disposed in an upstream of a latent image writing position P on the image carrying body. The developer replenishment box is contained in a process cartridge.