Abstract: Disclosed herein are stretched poly(arylene thioether) block copolymer films and production processes thereof, said block copolymer film comprising a thermoplastic material composed of (A) 100 parts by weight of a particular poly(arylene thioether) block copolymer, (B) up to 100 parts by weight of at least one other thermoplastic resin, and (C) up to 15 parts by weight of at least one filler.

Abstract: Disclosed herein are poly(arylene thioether) block copolymer fibers formed by melt-spinning a thermoplastic material composed of (A) 100 parts by weight of a particular poly(arylene thioether) block copolymer, (B) up to 50 parts by weight of at least one other thermoplastic resin and (C) up to 10 parts by weight of at least one filler.

Abstract: A high temperature wear resistant sintered alloy suitable for the material of a valve seat in an automotive vehicle engine. The matrix of the sintered alloy consists essentially of carbon ranging from 0.45 to 1.15% by weight, nickel ranging from 5.4 to 27% by weight, molybdenum ranging form 0.4 to 2.7% by weight, cobalt ranging from 4.2 to 7.2% by weight and balance being substantially iron. The matrix is formed of a mixture of at least one of sorbite structure and bainite structure and austenite structure. Furthermore, the matrix includes hard phase dispersed therein and containing at least silicon, molybdenum and cobalt. The sintered alloy of such a structure can exhibit high strength and wear resistance at high temperatures regardless of type of engine and kind of fuel in case of being used as the material of the valve seat, while maintaining production cost thereof lower.

Abstract: Disclosed herein are poly(arylene thioether-ketone) fibers obtained by melt-spinning a thermoplastic material which comprises 100 parts by weight of a melt-stable poly(arylene thioether-ketone) (PTK) and optionally, up to 50 parts by weight of at least one of thermoplastic resins. The PTK has predominant recurring units of the formula ##STR1## wherein the --CO-- and --S-- are in the para position to each other, and has a melting point, Tm of 310.degree.-380.degree. C., a residual melt crystallization enthalpy, .DELTA.Hmc (420.degree. C./10 min) of at least 10 J/g, a melt crystallization temperature, Tmc (420.degree. C./10 min) of at least 210.degree. C., and a reduced viscosity of 0.3-2 dl/g as determined by viscosity measurement at 25.degree. C. and a polymer concentration of 0.5 g/dl in 98 percent by weight sulfuric acid. The PTK fibers of this invention have high heat resistance and strength.

Abstract: Disclosed herein are poly(arylene thioetherketone) fibers obtained by melt-spinning a thermoplastic material which comprises 100 parts by weight of a melt-stable poly(arylene thioether-ketone) (PTK) and optionally, up to 50 parts by weight of at least one of thermoplastic resins. The PTK has predominant recurring units of the formula ##STR1## wherein the --CO-- and --S-- are in the para position to each other, and has a melting point, Tm of 310-380.degree. C., a residual melt crystallization enthalpy, .DELTA.Hmc (420.degree. C./10 min) of at least 10 J/g, a melt crystallization temperature, Tmc (420.degree. C./10 min) of at least 210.degree. C., and a reduced viscosity of 0.3-2 dl/g as determined by viscosity measurement at 25.degree. C. and a polymer concentration of 0.5 g/dl in 98 percent by weight sulfuric acid. The PTK fibers of this invention have high heat resistance and strength.

Abstract: A heat resistant and wear resistant iron-base sintered alloy to be used as the material of a valve seat and a valve face of an engine valve and a waste gate valve of a turbocharger for an internal combustion engine. The iron-base sintered alloy consists essentially of at least one of molybdenum and tungsten, ranging from 3 to 25% by weight, chromium ranging from 1 to 10% by weight, silicon ranging from 0.1 to 0.9% by weight, manganese ranging not more than 0.7% by weight, phosphorus ranging not more than 0.05% by weight, carbon ranging from 0.1 to 2.5% by weight, boron ranging from 0.5 to 2.0% by weight, intermetallic compound of TiAl ranging from 0.3 to 20% by weight, and balance including iron and impurities. In the sintered alloy, carbide, boride and/or carbide boride and TiAl are uniformly dispersed in the matrix, thereby strengthening grain boundary.

Abstract: A wear resistant iron-base sintered alloy consists essentially of at least one selected from the group consisting of molybdenum and tungsten, ranging from 5 to 20% by weight, chromium ranging from 2 to 10% by weight, silicon ranging from 0.1 to 0.9% by weight, manganese ranging not more than 0.7% by weight, phosphorus ranging not more than 0.05% by weight, carbon ranging from 0.1 to 0.8% by weight, boron ranging from 0.5 to 2.0% by weight, and balance including iron and an impurity, so that fine multiple carbide, multiple boride, and/or multiple carbide-boride can be homogeneously dispersed as hard grains in the structure of a matrix, thereby exhibiting excellent wear resistance, scuffing resistance and pitting resistance.

Abstract: An improved waveform generator used in an electronic musical equipment for reproducing musical sounds stored therein, in which the waveform of each musical sound is stored in a memory as a sequence of amplitudes sampled at specific sampling points on the waveform and reproduced therefrom by interpolating arithmetically any point between these sampling points.

Abstract: Wear-resistant, sintered iron alloys are provided. The alloys have a structure in which iron-based hard particles having a relatively high Cr content and copper or copper alloy particles are dispersed in an iron alloy matrix containing a relatively low content of Cr. The alloys are prepared by compression molding powders of the matrix alloy, the hard alloy, copper or copper alloy, an Fe-P alloy and graphite and sintering the obtained molding at a temperature of 980.degree. to 1130.degree. C.

Abstract: A ferro-sintered alloy having wear resistance at elevated temperatures comprising a matrix in which, on a weight basis, 25-75% of an alloying base A of the following composition is irregularly dispersed with 75-25% of an alloying base B of the following composition, the matrix having dispersed therein 3-15% of at least one of the following hard phases C and D, and optionally being impregnated in its pores with lead:______________________________________ Base A Base B ______________________________________ Cr 2-4% Co 5.5-7.5% Mo 0.2-0.4% Ni 0.5-3% V 0.2-0.4% Mo 0.5-3% C 0.6-1.2% C 0.6%-1.2% Fe the remainder Fe the remainder Hard phase C: 45-60% Co - 33-36% Mo. - and remainder Si Hard phase D: 45-60% Fe - 33-36% Mo - and remainder Si.

Abstract: A material, and a process for producing same, for fabricating components of valve-actuating mechanisms of internal combustion engines, the material comprising an iron-base sintered alloy, which comprises, by weight: 2-7% Cr (chromium); 0.1-1.5% Mo (molybdenum); 0.5-7% W (tungsten); 0.1-3% V (vanadium); and 0.5-3% C (carbon). Upon being subjected to a slide-contact with another member, the material exhibits a high degree of abrasion resistance and at the same time is capable of effectively protecting the material of a member operatively cooperating therewith in slide-contact. The material is thus highly suitable for very frequent slide-contact with a cam member or the like.

Abstract: A ferro-sintered alloy having wear-resistance at elevated temperatures, comprises a perlite matrix having a copper content of from 0.2 to 1.5% by weight. 10 to 50% by weight of a phase A rich in heat and corrosion resistance is dispersed in the matrix with phase A including 9 to 20% Cr, 6 to 15% Ni, 1.5 to 9.5% Mo, 1.5 to 9.5% W, 0.7 to 4.5 Cu and an Fe remainder. In addition, 2 to 15% by weight of an additional component is dispersed in the matrix which is selected from one of a group of components which are wear-resistant. The group of components comprises:50.about.70% Mo-Fe Alloy (by weight)50.about.70% Cr-Fe Alloy (by weight)45.about.60% Fe-33.about.36% Mo-Si Alloy (by weight)45.about.60% Co-33.about.36% Mo-Si Alloy (by weight).

Abstract: The invention provides improved composite and conjugate filaments to be used exclusively in in-water submerged purposes. Each of these filaments consists of a core of vinylidene fluoride resin consisting in turn of one or more filamentary element(s), while a sheath consists of polyamide resin. The composing ratio as measured between the cross-sections of these both resins is defined by a value extending from 1/99-to 40/60, preferably from 3/97 to 30/70, still more preferably between 3/97 and 20/80.

Abstract: An iron-based sintered sliding product having improved contact fitness and resistance to wear, in which 0.1 to 3 wt. % free graphite and Fe--P--C ternary alloy phase of hardness MHv 300 to 850 having over 3% to 20% of area are dispersed into an iron-based matrix containing either one selected from 0.1 to 1 wt. % Sn and 0.1 to 1 wt. % Zn, and 1 to 10 wt. % Cu and 0.3 to 1 wt. % C. As a modified embodiment of the present invention, an alloy containing Fe--Mo as a main component may be dispersed into the iron-based matrix in place of the aforesaid Fe--P--C ternary alloy phase. Said Fe--P--C ternary alloy phase may be prepared by mixing a single metal element, Fe, C and P into the powdered raw material of the iron-based matrix. Alternatively, said Fe--P--C ternary alloy phase may be prepared by mixing Fe--P--C alloy powder into the powdered raw material of the iron-based matrix.

Abstract: An improved polyvinylidene fluoride resin-made filament. It consists substantially of a blend of 99-wt. % of a first polyvinylidene fluoride resin component having an inherent viscosity higher than 1.30 dl/g on the one hand, and 1-60 wt. % of a second polyvinylidene fluoride component having an inherent viscosity lower than 1.20 dl/g on the other. The blend has a critical shearing stress lower than 2.8.times.10 dyne/cm.sup.2 and is subjected to melt-spinning and successively to a primary and a secondary stretching in a temperature region of 70.degree.-180.degree. C. The overall stretch factor is selected to be 4-10.