Abstract: The present invention provides a flue gas treatment system and a flue gas treatment method that enable the stable long-term operation of a plant by reducing NOx in a combustion flue gas and reducing the concentration of SO3 more compared with that available conventionally. The flue gas treatment method of removing NOx and SO3 in the gas that includes NOx and SO3 includes a denitration and SO3 reduction step of denitrating the gas and reducing SO3 into SO2, in which NH3 as a first additive and a second additive including one or more selected from the group consisting of an olefinic hydrocarbon expressed by a general formula: CnH2, (n is an integer of 2 to 4) and a paraffinic hydrocarbon expressed by a general formula: CmH2m+2 (m is an integer of 2 to 4) are added to the gas before bringing the gas into contact with a catalyst.

Abstract: A clad is produced by polymerizing methyl methacrylate and (meth)acrylic acid ester having alicyclic hydrocarbon group. A core is produced by an interfacial-gel-polymerization method. A first covering layer having a thickness being less than 500 ?m is formed on an outer surface of the clad to produce a single-fiber optical cable. A plurality of the single-fiber optical cables are bundled. A gap between the single-fiber optical cables is infused with a filler. The bundled single-fiber optical cables are covered with a second covering layer to produce a multi-fiber optical cable. Since the covering layer is thin, the multi-fiber optical cable has excellent flexibility and reduced bending loss.

Abstract: Disclosed is a method of manufacturing a preform for producing a plastic optical component comprising a graded-index core portion and a cladding portion in which the refractive index of the core portion continuously decreases from its center to the outer radius, and the refractive index of the cladding portion is smaller than that of the center of the core portion by 0.03 or more, comprising a first step of fabricating a polymer hollow tube for the cladding portion in which the inner wall of the polymer hollow tube has an arithmetic mean roughness of less than 0.4 ?m; and a second step of polymerizing a polymerizable composition in the hollow portion of the hollow tube to thereby form the core portion.

Abstract: A clad tube (21) is formed by melting and extruding a polymer, such as PMMA. The molten polymer is extruded through an extrusion die (12) to form a soft clad (20). The soft clad (20) is forwarded to a molding die (13) to correct the shape of the soft clad (20). A decompression chamber (31) in the molding die (13) is decompressed so that the outer surface of the soft clad (20) is tightly in contact with forming surface (30b) of the molding die (13). After molding the soft clad (20) in the molding die (13), the clad tube (20) with low fluctuation in thickness is obtained.

Abstract: A novel process for producing an optical transmission medium comprising a drawing step of drawing a molten portion of a preform to form the optical transmission medium is disclosed. In the process, the preform is heated by irradiation with laser light thereby being partially molten, and desirably rotated in a fixed direction, during the drawing step. An apparatus comprising a means for heating and melting partially a preform by irradiation with laser light and a means for drawing a molten portion of the preform is also disclosed. A novel plastic optical transmission medium is formed of a plastic wherein molecules are oriented in a certain direction not in parallel to the longitudinal direction of said medium is also disclosed.

Abstract: The present invention provides an image-receiving sheet for electrophotography, which is capable of providing an image excellent in gloss and which has an excellent offset resistance during a fixing step at a high temperature. The toner image-receiving layer comprises a polyester resin having the following characteristic properties: (1) said polyester resin containing at least 10%, based on the molar number of the whole polyhydric alcohol components, of bisphenol A as a polyhydric alcohol component; (2) said polyester resin has an intrinsic viscosity of 0.30 to 0.70; (3) said polyester resin has a flow-starting temperature of 100 to 160° C.; and (4) said polyester resin has a glass transition temperature ranging from 50° C. to a temperature lower than the fixing temperature by 10° C.

Abstract: A perform formed of polymer is constructed of a center rod, first-sixth core tubes and a clad tubes, which are coaxially disposed in this order such that the refractive index may become lower gradually. Between the neighboring tubes and rod are formed gaps, and the atmospheres in the gaps are sucked. As the melt-drawing is made in the suction, the tubes and the rods adequately contacts to each other, and impurities generated in the melt-drawing are removed.

Abstract: A clad is produced by polymerizing methyl methacrylate and (meth)acrylic acid ester having alicyclic hydrocarbon group. A core is produced by an interfacial-gel-polymerization method. A first covering layer having a thickness being less than 500 &mgr;m is formed on an outer surface of the clad to produce a single-fiber optical cable. A plurality of the single-fiber optical cables are bundled. A gap between the single-fiber optical cables is infused with a filler. The bundled single-fiber optical cables are covered with a second covering layer to produce a multi-fiber optical cable. Since the covering layer is thin, the multi-fiber optical cable has excellent flexibility and reduced bending loss.

Abstract: A process for producing a plastic optical member is provided that includes injecting a polymerizable monomer composition into a hollow plastic tube and polymerizing the composition within the hollow tube, wherein prior to injecting the composition one end of the hollow tube is sealed with a resin. The resin may have a composition different from that of the plastic forming the hollow tube. A process for producing a plastic optical fiber base material is also provided that includes injecting a polymerizable monomer composition into a hollow plastic tube and polymerizing the composition within the hollow tube, wherein prior to injecting the composition one end of the hollow tube is sealed with a resin. Furthermore, a process for producing a plastic optical fiber is provided that includes drawing the plastic optical fiber base material obtained by the above process. Moreover, also provided are a plastic optical member and a plastic optical fiber, which are produced by the above processes.

Abstract: The present invention discloses a method for producing plastic optical member comprising a core region and a clad region. The method comprises carrying out polymerization of a polymerizable monomer, thereby obtaining an area corresponding to the core region. The Polymerization is carried out in the presence of a polymerization initiator having a ten-hour, half-life decomposition temperature Th (° C.) (Tb−20≦Th; Tb is the boiling point (° C.) of the polymerizable monomer), at an initial polymerization temperature T1 (° C.) (Tb−10≦T1≦Tg; Tg is the glass transition point (° C.) of the polymer made of the polymerizable monomer), for a period which is equal to or longer than 10% of the half-life of the polymerization initiator at T1; and further carried out at an elevated temperature T2 (° C.

Abstract: The present invention provides an image-receiving sheet for electrophotography, which is capable of providing an image excellent in gloss and which has an excellent offset resistance during a fixing step at a high temperature.

Abstract: A photographic film has a width of 35 mm and comprises a continuous support comprising polyester and at least one photographic layer provided thereon. The support has a thickness of 112 to 128 .mu.m. The polyester has recurring units comprising 60 to 85 molar % of ethylene-2,6-naphthalate unit and 15 to 40 molar % of ethylene terephthalate unit and satisfies the formula (1):-0.65.ltoreq.?NDA!+log ?NET!.ltoreq.0.28 (1)wherein ?NDA! represents a ratio of a number of 2,6-naphthalate unit to a total number of 2,6-naphthalate unit and terephthalate unit, and ?NET! represents a ratio of a number of ethylene unit which has a 2,6-naphthalate unit on one side and a terephthalate unit on the other side to a total number of an ethylene unit in the polyester.

Abstract: A method of manufacturing a photographic printing paper support wherein a composition consisting essentially of polyethylene terephthalate is hot extruded so as to cover at least one surface of the raw paper, this method being characterized in that after a hot extruded film of the aforesaid composition is discharged onto the raw paper on the nip roll, it is pressed in contact with the chilled roll.

Abstract: A support for a photographic printing paper comprising a substrate and a waterproof resin coating layers provided on the both sides of the substrate, wherein at least the waterproof resin-coating provided on the side of the substrate on which an emulsion for forming an image is coated comprises i) a lowermost waterproof resin coating layer contacting the substrate and ii) at least one upper coating layer containing a waterproof resin capable of melt-extruded at a temperature of from 170.degree. to 290.degree. C. and containing uniformly dispersed titanium dioxide, and a method for manufacturing the support by melt extrusion.

Abstract: Disclosed is a photographic printing paper comprising a raw paper which has on the emulsion side a resin coating constituted of polyethylene terephthalate or a resin blend of polyethylene terephthalate and another resin and titanium oxide grains dispersed therein and on the back side a resin coating constituted of the same polyethylene terephthalate or resin blend as used in the resin coating on the emulsion side and inorganic grains having an average grain size of from 1.5 to 12 .mu.m.

Abstract: A photographic printing paper support wherein one side of the raw paper is covered by a composition containing titanium oxide dispersed in polyethylene terephthalate resin or a mixture of polyethylene terephthalate and another resin, and the other side is covered by a composition containing calcium carbonate dispersed in polyethylene terephthalate resin or a mixture of polyethylene terephthalate with another resin, which can provide an excellent photographic paper having good water resistance, whightness and gloss is disclosed.

Abstract: The information recording medium comprises a substrate provided with a prepit area and a pregroove area, a dye layer on the substrate and a reflecting layer on the dye layer, wherein the dye layer is a continuous layer formed on both the prepit area and the pregroove area, and the prepit area has a high modulation degree not less than 50%. Its embodiments are as follows: A medium in which a difference between an optical thickness of the dye layer on the bottom portion of a pregroove or a prepit and that of the dye layer on the land portion or a portion between prepits is not more than .lambda./8; one in which a prepit has a half width of 0.2 to 1.4 .mu.m and a depth of 150 to 400 nm, the pregroove has a half width of 0.2 to 1.4 .mu.m and a depth of 70 to 200 nm, the depth of the prepit is larger than the depth of the pregroove by not less than .lambda.

Abstract: An improved magnetic recording medium comprises a nonmagnetic support and a magnetic recording layer which comprises a ferromagnetic powder, a lubricant and an abrasive dispersed in a binder comprising a specific polyurethane resin and a specific vinyl chloride copolymer at a ratio (polyurethane resin:vinyl chloride copolymer) in the range of 15:85 to 90:10. The polyurethane resin has a polar group such as --COOM, --SO.sub.3 M, --OSO.sub.3 M and --PO(OM').sub.2, wherein M is hydrogen or an alkali metal atom, and M' is hydrogen, an alkali metal atom or a lower hydrocarbon group, one polar group being contained per 53,000 to 100,000 of the number-average molecular weight of the resin, and the vinyl chloride copolymer has one of the above-mentioned polar group, one polar group unit being contained per 10,000 to 100,000 of the number-average molecular weight of the copolymer.

Abstract: A magnetic tape cassette having a guide pole which is in sliding contact with the magnetic surface of the tape produced in such a manner as to improve the running characteristics of the tape while being capable of being manufactured at a low cost. A cylindrical stainless steel base member is subjected to a barreling treatment so as to secure fine particles of an inorganic material having a Moh's hardness of greater than 9 to the slide surface of the guide post. Moreover, the surface of the guide pole can be finished by a surface rolling to reduce the number of scratch-like grooves in the slide surface having a depth of more than 0.2 .mu.m and a width of less than 40 .mu.m to less than 11 per millimeter in the sliding direction of the tape.

Abstract: A magnetic tape cassette having a guide pole which is in sliding contact with the magnetic surface of the tape produced in such a manner as to improve the running characteristics of the tape while being capable of being manufactured at a low cost. A cylindrical stainless steel base member is subjected to a barreling treatment so as to secure fine particles of an inorganic material having a Moh's hardness of greater than 9 to the slide surface of the guide post. Moreover, the surface of the guide pole can be finished by a surface rolling to reduce the number of scratch-like grooves in the slide surface having a depth of more than 0.2 .mu.m and a width of less than 40 .mu.m to less than 11 per millimeter in the sliding direction of the tape.