Abstract: The present invention provides a prepreg comprising: a primary pre-pregnant made of a reinforced fiber substrate and an epoxy resin composition containing at least epoxy resin and thermoplastic resin impregnated into the reinforcing fiber that forms the reinforced fiber substrate; and a surface layer made of epoxy resin composition containing at least an epoxy resin and an epoxy resin-soluble thermoplastic resin that dissolves in the epoxy resin, the surface layer being formed on one or both surfaces of the primary prepreg; the prepreg being characterized in that only one of either the epoxy resin composition of the primary prepreg or the epoxy resin composition of the surface layer contains a hardening agent for an epoxy resin.

Abstract: The present invention provides a prepreg comprising: a primary pre-pregnant made of a reinforced fiber substrate and an epoxy resin composition containing at least epoxy resin and thermoplastic resin impregnated into the reinforcing fiber that forms the reinforced fiber substrate; and a surface layer made of epoxy resin composition containing at least an epoxy resin and an epoxy resin-soluble thermoplastic resin that dissolves in the epoxy resin, the surface layer being formed on one or both surfaces of the primary prepreg; the prepreg being characterized in that only one of either the epoxy resin composition of the primary prepreg or the epoxy resin composition of the surface layer contains a hardening agent for an epoxy resin.

Abstract: The present invention discloses a resin composition and a prepreg produced using the resin composition. The resin composition comprises, as essential components: 100 parts by mass of a component (A) which is an epoxy resin; 41 to 80 parts by mass of a component (B) which is thermoplastic resin particles; and 20 to 50 parts by mass (in terms of diaminodiphenylsulfone) of a component (C) which is diaminodiphenylsulfone microencapsulated with a coating agent. The thermoplastic resin particles (B) comprise at least thermoplastic resin particles (B1) having an average particle diameter of 1 to 50 ?m and thermoplastic resin particles (B2) having an average particle diameter of 2 to 100 ?m at a mass ratio of 3:1 to 1:3. The average particle diameter ratio D2/D1 of the average particle diameter D2 of the thermoplastic resin particles (B2) to the average particle diameter D1 of the thermoplastic resin particles (B1) is 2 or more.

Abstract: Provided are a thermosetting resin composition suitable for forming a composite material that has excellent mechanical characteristics, such as wet heat resistance and toughness, and also a prepreg using the same. The thermosetting resin composition includes at least a component [A] including thermoplastic resin particles and a thermosetting resin [B]. The component [A] includes a melt blend of at least the components [A-1] and [A-2] given below. In the particles, the component [A-1] and the component [A-2] may be in a non-compatibilized state or a compatibilized state.

Abstract: The present invention discloses: a resin composition comprising, as essential components, 100 parts by mass of a component (A) which is an epoxy resin, 41 to 80 parts by mass of a component (B) which is thermoplastic resin particles, and 20 to 50 parts by mass (in terms of diaminodiphenylsulfone) of a component (C) which is diaminodiphenylsulfone microencapsulated with a coating agent, in which resin composition the thermoplastic resin particles (B) comprise at least thermoplastic resin particles (B1) having an average particle diameter of 1 to 50 ?m and thermoplastic resin particles (B2) having an average particle diameter of 2 to 100 ?m at a mass ratio of 3:1 to 1:3 and the average particle diameter ratio D2/D1 of the average particle diameter D2 of the thermoplastic resin particles (B2) to the average particle diameter D1 of the thermoplastic resin particles (B1) is 2 or more, and a prepreg produced using the resin composition.

Abstract: The present invention provides novel compounds of formula I 1

Abstract: The invention relates to a liquid-crystalline medium based on a mixture of polar compounds having positive dielectric anisotropy, characterized in that it comprises one or more compounds of the general formula I in which R, Y and L1 are as defined therein.

Abstract: The invention relates to a liquid-crystalline medium based on a mixture of polar compounds having positive dielectric anisotropy, characterized in that it comprises one or more compounds of the general formula I in which R, Y and L1 are as defined in claim 1.

Abstract: An electromagnetic control valve is composed of a spool section for switching fluid passages on or off, a solenoid section for driving the spool in one direction, a magnetic moving core slidably disposed in the stator, a nonmagnetic shaft fixed to the moving core, and a spring member for biasing the spool in the direction opposite to the one direction. The spool section includes a spool and a sleeve. The solenoid section is connected to the spool section and includes a cylindrical magnetic stator, cylindrical magnetic yoke disposed to surround the stator and a magnetic coil disposed between the stator and the yoke. The stator is fixed to the sleeve at one end and having a bottom at the other end thereof. The shaft has one end to be in contact with the end of the sleeve thereby positioning the moving core in a longitudinal direction in the stator.

Abstract: A nematic liquid crystal mixture having a birefringence .increment.n of at least 0.20, comprising at least one fluorinated terphenyl of formula I and at least one fluorinated terphenyl of formula II ##STR1## wherein R and R' are each independently of one another or alkyl of up to 12 C atoms, optionally substituted by halogen, CH.sub.2 group optionally replaced, in each case independently of one another, by --O--, ##STR2## in such a manner that oxygen atoms are not linked directly to one another,X and X.sup.1 are each independently F, Cl, CF.sub.3, OCF.sub.3 or OCHF.sub.2, andL.sup.1 -L.sup.4 are each independently H or F.

Abstract: In a synchronization stabilizing circuit and a television signal receiver, the follow-up range (TX) of the synchronizing signal (SH) is changed based on the judged result (J1) that it is judged whether or not the synchronizing signal (SH) itself exists and the judged result (J2) that it is judged whether or not the input signal exists in a follow-up range (TX), so that the signal can be synchronized easily in a short period even if the frequency of the synchronizing signal (SH) is deviated.

Abstract: In a vertical synchronizing signal stabilizing circuit, an integrated circuit and a television signal processing device, a vertical synchronizing signal of which period is stabilized can be output with a small number of elements and a simple constitution, without being influenced by the state of the television signal. On the basis of a first distinguish signal which indicates whether there is a separated signal separated from the television signal as the vertical synchronizing signal or not and of a second distinguish signal which indicates whether the period of the separated signal is the standard period or not, the plural states of the separated signal are discriminated, and the processing mode of the separated signal processing circuit is switched on the basis of the result of the discrimination to process the separated signal.

Abstract: Liquid-crystalline medium based on a mixture of polar compounds having positive dielectric anisotropy, characterized in that it contains one or more compounds of the general formula I ##STR1## in which, R, A.sup.1, Z.sup.1, Y, ring B and m are as defined in claim 1.

Abstract: A nematic liquid-crystal composition for active matrix displays with high voltage holding ratio, an optical birefringence an in the range from 0.12 to 0.13 and a low threshold voltage.

Abstract: The invention relates to improved STN displays of which the nematic liquid crystalline medium comprises compounds of formulae I1, I2, II1 and/or III1 ##STR1## wherein R.sup.3 and R.sup.4 are each independently alkyl with 1 to 8 C atoms, ##STR2## wherein R.sup.1 is alkyl or alkoxy with 1 to 8 C atoms, ##STR3## wherein R2 is oxaalkyl, alkenyl with up to 8 C atoms.

Abstract: The invention relates to a liquid-crystalline medium based on a mixture of polar compounds having positive dielectric anisotropy, characterized in that it contains one or more compounds of the general formula I ##STR1## in which X is fluorine, chlorine, CF.sub.3, OCF.sub.3 or OCHF.sub.2, ring A is trans-1,4-cyclohexylene or 1,4-phenylene, and R is alkyl, oxaalkyl, fluoroalkyl or alkenyl, in each case having up to 7 carbon atoms.

Abstract: The invention relates to a nematic liquid-crystal composition for active matrix displays with high voltage holding ratio and extremely good low temperature stability.

Abstract: Supertwist liquid-crystal displays having excellent properties are obtained using a nematic liquid-crystal mixture based on component A which containsone or more compounds of the formula IIa or IIb: ##STR1## one or more compounds of the formulae IIc to IIe: ##STR2## and one or more compounds of the formulae IIf to ##STR3## in which R, L.sup.1 and L.sup.2 and X are as defined herein.

Abstract: The invention relates to a nematic liquid-crystal composition for active matrix displays with high voltage holding ratio and extremely good low temperature stability.

Abstract: The invention relates to a nematic liquid-crystal composition for active matrix displays with high voltage holding ratio and extremely good low temperature stability.