Abstract: A resin pulley is provided in which, in particular, abrasion resistance in a dusty atmosphere and thermal shock resistance are superior and belt attacking property is suppressed. A resin composition including 35 to 55 mass % of a phenolic resin as a base resin, 1 mass % or more of an acrylonitrile butadiene rubber, 10 to 25 mass % of an inorganic fiber and 3 to 15 mass % of an inorganic powder, and further comprising a polyester acrylate, and a resin pulley formed with the use of the resin composition.

Abstract: The present invention relates to a polyimide-metal laminate that ensures a high adhesion of a metal layer and suitable for use as a material of a high density circuit board. In particular, it provides a polyimide film characterized by having undergone a surface treatment with an alkaline aqueous solution containing a permanganate. The alkaline aqueous solution preferably contains a hydroxide. It also provides a polyimide-metal laminate characterized in that on a surface of the polyimide film a thermoplastic polyimide layer and a metal layer are formed, and a method of producing the polyimide-metal laminate.

Abstract: A resin pulley according to the present invention is obtained by molding a resin composition containing a phenol resin serving as a base resin, 15 to 50% by weight of an inorganic powder having a Mohs hardness of not less than 6.5, 20 to 40% by weight of a reinforcing fiber, and 1 to 5% by weight of a lubricant and thermosetting the phenol resin, and is superior in dimensional stability and strength, is also superior in wear resistance particularly in a dust atmosphere or the like, and is superior in practicality as an alternate to a metal pulley.

Abstract: An optical system includes a reflecting mirror to which rays are incident across a relatively wide incidence angle range, while well suppressing a change in a polarization state in an optical path of a beam incident substantially as linearly polarized light. The optical system has a first deflecting plane mirror and a second deflecting plane mirror and a substantially linearly polarized beam is incident to the optical system. Each of the first deflecting plane mirror and the second deflecting plane mirror is so arranged that a change from a phase difference between p-polarized incident light to a reflecting surface and s-polarized incident light to the reflecting surface, to a phase difference between reflected light of the p-polarized incident light to the reflecting surface and reflected light of the s-polarized incident light to the reflecting surface is within 30° for all rays incident to the reflecting surface.

Abstract: An inventive ball bearing retainer (4) is entirely composed of a resin composition, and has pocket surfaces (6) for retaining balls (5) and projections (8) provided on the pocket surfaces (6) and containing a solid lubricant (CB). A ball bearing (1) incorporates the ball bearing retainer (4). By the effect of the solid lubricant (CB), the projections (8) are less liable to be worn out in a short period particularly when the ball bearing (1) is used in a higher temperature environment. The projections (8) define clearances between the balls (5) and the pocket surfaces (6), making it possible to maintain the effect of preventing noise, increase in the torque of the ball bearing (1), reduction of the service life of a lubricant and the like for a longer period of time.

Abstract: An optical element used such that at least one surface thereof is in contact with a liquid in a liquid immersion exposure apparatus in which a substrate is exposed by exposure light illuminated on the substrate via the liquid with a refraction index in a range between 1.60 and 1.66 to the light with a wavelength of 193 nm, comprising: a base material with a refraction index in a range between 2.10 and 2.30 to the light with a wavelength of 193 nm; and a first antireflection film formed on the contact surface between the base material and the liquid, wherein the first antireflection film includes a first antireflection layer with a refraction index in a range between 1.80 and 2.02 to the light with a wavelength of 193 nm and an optical film thickness in a range between 0.25? and 0.42? to the wavelength ? of the exposure light, a second antireflection layer with a refraction index in a range between 1.65 and 1.77 to the light with a wavelength of 193 nm and an optical film thickness in a range between 0.

Abstract: In the present invention, a novolac-type phenolic resin which does not require cold storage is used as a base resin for a resin pulley. To improve dimensional stability, strength, thermal shock resistance and abrasion resistance of the resin pulley, the pulley is formed with a resin composition containing the novolac-type phenolic resin, silica which is difficult to be abraded itself to be an abrasive powder and serves to grind and abrade dust with contact, and 5 to 20% by weight of alumina, harder than silica, having an average particle diameter of 5 ?m or larger.

Abstract: Disclosed is a bearing retainer made of a resin composition comprising a polyamide resin which has a repeating unit represented by the formula (1) below and a repeating unit represented by the formula (2) below in which formulae R1 and R2 represent three kinds of groups, namely a p-phenylene group, a linear alkylene group having 6-10 carbon atoms, and a branched chain alkylene group having 6-10 carbon atoms. Such a bearing retainer can be used in various applications since it has sufficiently good resistance to a wider variety of lubricating oils in a wider temperature range when compared with conventional resin hearing retainers.

Abstract: A photosensitive resin composition which contains (A) polyamic acid, (B) (meth)acrylate having at least two photopolymerizable C?C unsaturated double bonds, (C) a photopolymerization initiator and (D) a flame retardant, with the (meth)acrylate (B) having at least two photopolymerizable C?C unsaturated double bonds being contained in an amount of 10 to 700 parts by weight based on 100 parts by weight of the polyamic acid (A).

Abstract: A composition for forming a film for protecting wiring which in one aspect includes a polyimide precursor, a compound having at least two photopolymerizable groups, and a photopolymerization initiator, wherein the polyimide precursor includes a polyimide precursor obtained from a diamine component comprising a defined diamine compound. In other aspects, a dry film for forming a wiring-protecting film using the composition and a substrate having wiring protected by means of the dry film are provided.

Abstract: The present invention relates to a composition for forming a film for protecting wiring, wherein the content of sulfur atoms in solid contents of the composition is 150 ppm or less. The present invention also relates to a dry film for forming a wiring-protecting film, using the composition, and a substrate having wiring protected by means of the dry film.

Abstract: A resin pulley according to the present invention is obtained by molding a resin composition containing a phenol resin serving as a base resin, 15 to 50% by weight of an inorganic powder having a Moths hardness of not less than 6.5, 20 to 40% by weight of a reinforcing fiber, and 1 to 5% by weight of a lubricant and thermosetting the phenol resin, and is superior in dimensional stability and strength, is also superior in wear resistance particularly in a dust atmosphere or the like, and is superior in practicality as an alternate to a metal pulley.

Abstract: A photosensitive resin composition which contains (A) polyamic acid, (B) (meth)acrylate having at least two photopolymerizable C═C unsaturated double bonds, (C) a photopolymerization initiator and (D) a flame retardant, with the (meth)acrylate (B) having at least two photopolymerizable C═C unsaturated double bonds being contained in an amount of 10 to 700 parts by weight based on 100 parts by weight of the polyamic acid (A).

Abstract: A power transmission coupling comprises a power transmission member having first and second ends. The first and second ends are respectively connected to ends of corresponding shafts through corresponding first and second sliding pairs. The first and second sliding pairs are different in sliding direction from each other. The power transmission member is made of a fiber-reinforced synthetic resin of a polymer alloy comprising polyamide MXD6 and polyphenylene ether, to which glass fibers are being blended.

Abstract: A visible light curable resin composition containing a photocurable resin, a photoreaction initiator and a photosensitizer having the formula (1). The composition has a very high sensitivity to a general-purpose visible light laser, so that a high-speed scanning exposure is possible by the laser, and an extremely fine high resolution can be obtained. In addition, the composition can be used for coating or printing under safelight irradiating conditions and under bright circumstantial conditions without any thickening of the composition, and hence the composition can exert excellent noticeable effects in points of safe operativity, operational efficiency and the stability of products. Formula (1) is as follows: ##STR1## wherein rings X.sub.1 and X.sub.2 are each an optionally substituted pyrrole ring; Y is H, CN, optionally substituted alkyl, aralkyl, aryl, heteroaryl or alkenyl group; and Z.sub.1 and Z.sub.

Abstract: An optical recording medium having at least a recording layer and a reflective layer on a substrates, the said recording layer contains a dipyrromethene metal chelate compound obtained from a dipyrromethene compound represented by the general formula (1) and a metal ion: ##STR1## wherein R.sup.1 to R.sup.7 are defined in the specification.

Abstract: An optical recording medium having at least a recording layer and a reflective layer on a substrate. The recording layer contains a dipyrromethene metal chelate compound obtained from a dipyrromethene compound represented by the general formula (1) and a metal ion: ##STR1## wherein R.sup.1 to R.sup.7 are defined in the specification.

Abstract: An optical information recording medium is here disclosed which comprises a transparent substrate, a recording layer comprising an organic dyestuff on which information can be written by a laser beam, a reflective layer and a protective layer formed in this order on the substrate, the aforesaid optical information recording medium being characterized by containing a pit.multidot.edge control agent for the formation of recording pits, particularly a dyestuff thermal decomposition accelerator in the recording layer. By the addition of the pit.multidot.edge control agent, deviation properties and jitter properties can be remarkably improved, whereby a CD-R medium having a low error rate and good recording properties can be provided. In consequence, stable compatibility with a commercial CD player can be secured.

Abstract: An optical recording medium comprising a recording layer, a light interference layer, a reflective layer and a protective layer that are laminated on a substrate, characterized in that said recording layer and said light interference layer comprise at least one organic dye, and that a light absorbent and/or a thermal decomposition promoter are/is added to said light interference layer, wherein the optical recording medium has compatibility that allows good recording and/or reproduction by using lasers of different two wavelength ranges and has good recording properties.

Abstract: An optical information recording medium is here disclosed which comprises a transparent substrate, a recording layer comprising an organic dyestuff on which information can be written by a laser beam, a reflective layer and a protective layer formed in this order on the substrate, the aforesaid optical information recording medium being characterized by containing a pit-edge control agent for the formation of recording pits, particularly a dyestuff thermal decomposition accelerator in the recording layer. By the addition of the pit-edge control agent, deviation properties and jitter properties can be remarkably improved, whereby a CD-R medium having a low error rate and good recording properties can be provided. In consequence, stable compatibility with a commercial CD player can be secured.