Abstract: A dark or black print article is ink-jet printed with a white ink composition comprising at least a white pigment having a particle size of less than 3 .mu.m, a solvent and a binder resin with a good print stability. The white ink composition has a good dispersion stability, a good redispersability, and no nozzle clogging.

Abstract: The disclosure is concerned with a photoconductive member useful for electrophotography wherein a charge generating layer containing a new metal-free phthalocyanine and a charge transport layer containing a nonionic compound of styrylic or oxazol dye base. The photosensitive member exhibits a high sensitivity to light having a long wavelength and therefore, it is properly used as photosensitive member for printers using semiconductor lasers.

Abstract: A thermosetting resin composition comprising (A) at least one dicyanamide compound and (B) at least one polyvalent imide having one or more unsaturated bonds and, if necessary (C) at least one polymerizable compound of epoxy compounds, phenolic compounds and triallyl isocyanurate compounds, and a prepolymer thereof obtained by subjecting the composition to a preliminary reaction with heating to the B stage can give a cured product having excellent heat resistance of class C and flexibility.

Abstract: A multi-layer printed circuit board produced by laminating a plurality of unit circuit sheets via prepreg resin sheets, the cured resin in said unit circuit sheet having a glass transition temperature Tg.sub.1, said prepreg resin sheets having been prepared by impregnating a reinforcing substrate with a resin composition which can be cured at a temperature equal to or lower than both the glass transition temperature of Tg.sub.1 and that of Tg.sub.2 of the resin in the prepreg resin sheet after cured, and binding the laminated sheets with heating under pressure at a temperature equal to or lower than both the temperatures of Tg.sub.1 and Tg.sub.2, has excellent dimensional stability, heat resistance and through-hole reliability.

Abstract: The disclosure is concerned with an electrophotographic recording medium having a layer of a photoconductive material containing at least one member selected from the group consisting of .tau., .tau.', .eta., and/or .eta.' form metal free phthalocyanine, the layer being formed on an electroconductive supporter.The recording medium of this invention is characterized in that the recording medium exhibits high sensitivity to longer wavelength light.

Abstract: This invention relates to a guest-host type liquid crystal composition and a color liquid crystal display device in which said composition has been sealed. This invention provides a liquid crystal composition containing a specific anthraquinone dye as a pleochroic dye which, as the guest dye, has a degree of orderness of the alignment (order parameter) in the host liquid crystal in the range from 0.5 to 1, shows remarkable contrast between the colored state and the uncolored state, and is excellent in stability to light, heat, and the like. Further, this invention provides a color guest-host type liquid crystal display device in which said liquid crystal composition has been sealed.

Abstract: A polymer which has excellent heat resistance and mechanical properties which is useful as a molding material, contains the structural units having the following formulae [I] and [II]: ##STR1## wherein A and B each represents an at least divalent organic group having at least one aromatic ring such as a diphenyl ring; and m and n each represents a number of at least 1. The polymer is used in the form of a solution or varnish as an impregnating, laminating, bonding or film-forming coating or prepreg-forming varnish. A resin composition for forming the polymer contains an aromatic cyanamide compound and an aromatic amine which are reacted to form a prepolymer which, upon heating, is converted into a cured polymer having the structural units of formulae [I] and [II].

Abstract: A thermosetting resin composition comprises (A) at least one dicyanamide compound and (B) at least one polyvalent imide having one or more unsaturated bonds and, if necessary (C) at least one polymerizable compound of epoxy compounds, phenolic compounds and triallyl isocyanurate compounds. A thermosetting prepolymer can be obtained by subjecting the composition to a preliminary reaction with heating to the B stage and this prepolymer can give a cured product having excellent heat resistance of class C and flexibility. An exemplary composition containing 60 parts by wt. of 4,4'-dicyanomidodiphenylmethane and 40 parts by wt. of N,N'-4,4'-diphenylmethane bismaleimide dissolved in methyl Cellosolve is reacted at 70.degree. to 110.degree. C. for about 40 minutes to obtain a prepolymer soluble in methyl ethyl ketone.

Abstract: When an alkaline earth metal carbonate powder is mixed with an adhesive and is formed into an adhesive layer in a conventional covering method, a problem of the transfer of catalyst for electroless plating during a masking step or later electroless plating step is solved. Further, blisters under plated film caused by a fire retardant contained in an insulating substrate is also overcome by the use of alkaline earth metal powder.

Abstract: In a complex type electrophotographic plate comprising an electroconductive support, superposed thereon a charge generating material (CGL) layer and a charge transport material layer superposed on the CGL layer when there is used as said charge transport material at least one compound of the formula:X--(CH.dbd.CH).sub.n --CH.dbd.Ywherein X is a heterocyclic group of the formula: ##STR1## Y is a heterocyclic group of the formula: ##STR2## these heterocyclic groups may be substituted by one or more lower alkyl groups, halogen atoms, or phenyl groups; Z is an oxygen, sulfur or selenium atom; R is an alkyl group having 1 to 7 carbon atoms; n is an integer of 1 or 2; and one hydrogen atom in the group of the formula --(CH.dbd.CH).sub.n -- may be substituted by an alkyl group having 1 to 4 carbon atoms, a halogen atom, a phenyl group, a styryl group or a group of the formula: ##STR3## electrophotographic characteristics such as light sensitivity, dark decay characteristics, repetition characteristics, etc.

Abstract: The disclosure is concerned with a maleimide-diamine resin composition which is well soluble to a low boiling point solvent and is excellent in heat resistance. The composition is featured by containing a maleimide-diamine adduct having the general formula: ##STR1## wherein A is a mono-, di-, tri- or tetravalent organic group containing at least two carbon atoms, R.sub.1 through R.sub.6 are hydrogen atom, a lower alkyl group, a lower alkoxy group, chlorine atom, bromine atom, trifluoromethyl group, or trichloromethyl group, and m is an integer of 0-4.

Abstract: Electrophotographic copying is carried out by electrostatically forming a latent image on a recording medium, supplying a magnetic toner of single component system containing at least a resin and fine particles of forromagnetic material on a non-magnetic sleeve provided with a permanent magnet roller having a plurality of magnetic poles therein, transporting the magnetic toner into a gap between the recording medium and the non-magnetic sleeve, attaching the magnetic toner to the recording medium, thereby developing the latent image into a visible image, electrostatically transferring the toner image thus formed on the recording medium onto a transfer sheet, and fixing the transferred image, thereby obtaining a final image, wherein the magnetic toner has a resistivity of more than 5.times.10.sup.15 .OMEGA.cm and a relative dielectric constant of less than 3.0.

Abstract: An electrophotographic photosensitive material having a long lifetime can be provided by forming an amorphous silicon layer having a thickness of 0.01-0.08 .mu.m on the photoconductive layer on the electrically conductive substrate in the said material without changing the characteristics of the photoconductive layer.

Abstract: In an electrophotographic plate comprising a substrate and a photoconductive layer formed on said substrate, when said substrate is made of an age-hardening type aluminum alloy and has a Vickers hardness of 60 Hv or higher, there can be produced electrophotographic plates high in dimensional accuracy, good in resistance to mechanical damages and impact, and very small in eccentricity when molded in the form of a drum. When the surface hardness of the selenium photoconductive layer is made 5 H or harder in pencil hardness, the resulting electrophotographic plate is excellent in printing performance and has a long life.

Abstract: A process for producing a fire retardant and heat resistant copper-clad laminated board, characterized in that a maleimide resin type varnish containing a small amount of a specific halogenated diphenyl ether compound is used for impregnation of base material therewith. Copper-clad laminated boards produced according to the present invention may be so improved in fire or flame retardant properties as to be classed 94 V-0 in accordance with UL 94 (vertical burning test), and, nevertheless, are not substantially downgraded in heat resisting properties as well as copper foil peel strength.

Abstract: A pleochroic color display device is provided which comprises a layer of guest-host type liquid crystal sandwiched between two transparent electrodes for driving the liquid crystal, the guest-host liquid crystal containing a dichroic dye as guest material, and a color filter disposed in front or rear of the layer of the guest-host type liquid crystal. High contrast pleochroic color displays can be obtained by selecting a blackish dye as the dichroic dye. Dichroic displays other than white ones can be produced by the use of a single liquid crystal cell and a single color filter (with one color).

Abstract: A process for preparing a thermosetting maleimide type prepolymer which comprises reacting (A) a polyfunctional maleimide compound, (B) a bis-maleimide, (C) a diamine and (D) an epoxy compound. The maleimide type prepolymer prepared according to the process of the present invention has rapid curability and excellent solubility in low boiling point solvents such as acetone, methyl ethyl ketone and methyl cellosolve, which are available at low cost. Accordingly, the prepolymer is advantageously used especially for the production of laminated boards having good heat resisting properties, low moisture absorption and good adhesion to various substrates such as a copper foil.

Abstract: A liquid crystal display element which may have a multi-layer structure comprising substrates having electrodes and liquid crystal orientation controlling films on the sides thereof facing a liquid crystal layer and one or more liquid crystal layers interposed between said substrates, characterized in that the liquid crystal orientation controlling film is made from a copolymer produced by reacting a dibasic acid dihydrazide, a diamine and a tetracarboxylic acid dianhydride, followed by ring closure and dehydration with heating, is excellent in transparency and the electrode (partially reflected) pattern is hardly observable.

Abstract: An electrostatic photographic method for reversal development using a magnetic brush, with the magnetic brush and photoconductive drum being grounded, and with the development being performed using a dry reversal developer comprising 100 parts by weight of a carrier having ferromagnetic properties and 1 to 10 parts by weight of a toner having a volume specific resistance falling within the range between 3.5.times.10.sup.9 and 1.times.10.sup.11 .OMEGA.-cm.

Abstract: A complex type electrophotographic plate comprising an electroconductive support and a charge generating layer and a charge transport layer characterized in that the charge generating layer contains at least a copper phthalocyanine and the charge transport layer contains at least a trinitrofluorenone, has excellent photosensitivity and adhesion to the support.