Abstract: A composition is disclosed, comprising(1) a polyamide as a dispersed phase and(2) a polyarylene sulfide as a continuous phase, wherein at least a part of the polyarylene sulfide has at least one modifying group directly bonded to the aromatic ring thereof, where the modifying group is selected from the group consisting of a carboxyl group, an alkali metal salt of a carboxyl group, and an alkaline earth metal salt of a carboxyl group, and where the modifying group is present at a ratio of 10 or more millimoles of the modifying group per kilogram of the polyamide. The composition has improved mechanical strength.

Abstract: A pair of tubular products of polyarylene sulfide having end faces to be welded are welded to each other by heating the end faces by a hot plate in no contact with the end faces to a surface temperature which is at least the melting heat-absorption peak temperature and at most 80.degree. C. above the melting initiation temperature of the polyarylene sulfide, and abutting the end faces under a pressure of 50-1500 kPa when the end faces are at a surface temperature which is at least 10.degree. C. above the melting initiation temperature and not exceeding the melting heat-absorption peak temperature of the polyarylene sulfide. As a result, a welded tubular structure having a weld with a small inside bead but having a sufficiently large weld strength can be obtained with substantially no thermal degradation and at a good operating efficiency.

Abstract: A heat-resistant stretched film is obtained by stretching a resin composition comprising 100 parts by weight of a poly(arylene sulfide) of a substantially linear structure and 5 to less than 100 parts by weight of a melt-stable poly(arylene thioether-ketone). The poly(arylene sulfide) has a melt viscosity of at least 1,000 poises as measured at 310.degree. C. and a shear rate of 200 sec.sup.-1. The poly(arylene thioether-ketone) has predominant recurring units of the formula ##STR1## wherein the --CO-- and --S-- groups are bonded in the para position to each other through the benzene ring, and has the following physical properties (a)-(c):(a) a melting point, Tm being 310.degree.-380.degree. C.;(b) a melt crystallization temperature, Tmc (420.degree. C./10 min) being at least 210.degree. C. and a residual melt crystallization enthalpy, .DELTA.Hmc (420.degree. C./10 min) being at least 10 J/g; and(c) a reduced viscosity being 0.3-2 dl/g at 25.degree. C. and a polymer concentration of 0.

Abstract: Disclosed herein is a resin composition of high heat resistance, comprising 100 parts by weight of at least one arylene thioether ketone polymer and 0.05-30 parts by weight of strontium carbonate.

Abstract: Disclosed herein are a poly(arylene thioether) block copolymer alternately comprising (A) at least one poly(arylene thioether-ketone) block having predominant recurring units of the formula ##STR1## wherein the --CO-- and --S-- are in the para position to each other and (B) at least one poly(arylene thioether) block having predominant recurring units of the formula ##STR2## (a) the ratio of the total amount of the poly(arylene thioether) block (B) to the total amount of the poly(arylene thioether-ketone) block (A) being within a range of 0.05-5 by weight, (b) the average polymerization degree of the poly(arylene thioether) block (B) being at least 10, and (c) said block copolymer having a melt viscosity of 2-100,000 poises as measured at 350.degree. C. and a shear rate of 1,200/sec as well as a production process the poly(arylene thioether) block copolymer.

Abstract: Disclosed herein are a poly(arylene thioether) block copolymer alternately comprising (A) at least one poly(arylene thioether-ketone) block having predominant recurring units of the formula ##STR1## wherein the --CO-- and --S-- are in the para position to each other and (B) at least one poly(arylene thioether) block having predominant recurring units of the formula ##STR2## (a) the ratio of the total amount of the poly(arylene thioether) block (B) to the total amount of the poly(arylene thioether-ketone) block (A) being within a range of 0.05-5 by weight, (b) the average polymerization degree of the poly(arylene thioether) block (B) being at least 10, and (c) said block copolymer having a melt viscosity of 2-100,000 poises as measured at 350.degree. C. and a shear rate of 1,200/sec as well as a production process the poly(arylene thioether) block copolymer.

Abstract: Disclosed herein are a poly(arylene thioether) block copolymer alternately comprising (A) at least one poly(arylene thioether-ketone) block having predominant recurring units of the formula ##STR1## wherein the --CO-- and --S-- are in the para position to each other and (B) at least one poly(arylene thioether) block having predominant recurring units of the formula ##STR2## (a) the ratio of the total amount of the poly(arylene thioether) block (B) to the total amount of the poly(arylene thioether-ketone) block (A) being within a range of 0.05-5 by weight, (b) the average polymerization degree of the poly(arylene thioether) block (B) being at least 10, and (c) said block copolymer having a melt viscosity of 2-100,000 poises as measured at 350.degree. C. and a shear rate of 1,200/sec as well as a production process the poly(arylene thioether) block copolymer.

Abstract: Disclosed herein are a polymer alloy prepared by polymerizing 0.1 to 100 parts by weight of at least one radically polymerizable monomer to 100 parts by weight of polyarylene thioether having a repeating unit of ##STR1## as a main constituent and at least a part of said radically polymerizable monomers is polymerized within inner pores of the polyarylene thioether particles and a process for producing the polymer alloy.The polymer alloy of polyarylene thioether according to the present invention has the fine particles of the radically polymerized monomer uniformly dispersed in the said polymer alloy, and accordingly, the polymer alloy of polyarylene thioether according to the present invention is excellent in various physical properties, such as, good impact strength and improved anti-flash property.

Abstract: Disclosed herein are a poly(arylene thioether) block copolymer alternately comprising (A) at least one poly(arylene thioether-ketone) block having predominant recurring units of the formula ##STR1## wherein the --CO-- and --S-- are in the para position to each other and (B) at least one poly(arylene thioether) block having predominant recurring units of the formula ##STR2## (a) the ratio of the total amount of the poly(arylene thioether) block (B) to the total amount of the poly(arylene thioether-ketone) block (A) being within a range of 0.05-5 by weight, (b) the average polymerization degree of the poly(arylene thioether) block (B) being at least 10, and (c) said block copolymer having a melt viscosity of 2-00,000 poises as measured at 350.degree. C. and a shear rate of 1,200/sec as well as a production process the poly(arylene thioether) block copolymer.

Abstract: Disclosed herein is a melt-stable poly(arylene thioether-ketone) prepreg, which comprises in integral combination (A) 20-90 wt. % of a fibrous reinforcing material which comprises long fibers and/or at least one shaped long fiber body, said fibers and/or body being formed of inorganic fibers and/or organic fibers; and (B) 10-80 wt. % of a a thermoplastic matrix material composed principally of a melt-stable poly(arylene thioether-ketone) having predominant recurring units of the formula ##STR1## and having 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 0.2-2 dl/g. A melt-stable molded or formed product can also be obtained by shaping the above prepreg or an arrangement or laminate of prepregs of the same type as the above prepreg at 140.degree.-450.degree. C. under stresses.

Abstract: Disclosed herein is a process for the preparation of a poly(arylene thioether-ketone) improved in melt stability, which comprises subjecting a poly(arylene thioether-ketone) (PTK) to a heat treatment for 5-5.times.10.sup.3 minutes in a powdery state and a temperature range of 200.degree.-350.degree. C. The PTK has predominant recurring units of the formula ##STR1## and has a melting point, Tm of 310.degree.-380.degree. C., a melt crystallization temperature, Tmc (420.degree. C./10 min) of at least 210.degree. C., a residual melt crystallization enthalpy, .DELTA.Hmc (420.degree.C./10 min) of at least 10 J/g and a reduced viscosity of 0.2-2.0 dl/g. PTKs improved in melt stability and prepared in accordance with the above-described preparation process are also disclosed.

Abstract: Disclosed herein are a polymer alloy prepared by polymerizing 0.1 to 100 parts by weight of at least one radically polymerizable monomer to 100 parts by weight of polyarylene thioether having a repeating unit of ##STR1## as a main constituent and at least a part of said radically polymerizable monomers is polymerized within inner pores of the polyarylene thioether particles and a process for producing the polymer alloy.The polymer alloy of polyarylene thioether according to the present invention has the fine particles of the radically polymerized monomer uniformly dispersed in the said polymer alloy, and accordingly, the polymer alloy of polyarylene thioether according to the present invention is excellent in various physical properties, such as, good impact strength and improved anti-flash property.

Abstract: Disclosed herein is a process for the preparation of a poly(arylene thioether-ketone) improved in melt stability, which comprises subjecting a poly(arylene thioether-ketone) (PTK) to a heat treatment for 5-5.times.10.sup.3 minutes in a powdery state and a temperature range of 200.degree.-350.degree. C. The PTK has predominant recurring units of the formula ##STR1## and has a melting point, Tm of 310.degree.-380.degree. C., a melt crystallization temperature, Tmc (420.degree. C./10 min) of at least 210.degree. C., a residual melt crystallization enthalpy, .DELTA.Hmc (420.degree. C./10 min) of at least 10 J/g and a reduced viscosity of 0.2-2.0 dl/g. PTKs improved in melt stability and prepared in accordance with the above-described preparation process are also disclosed.

Abstract: The present invention discloses a polyarylene thioether composition prepared by blending a polyarylene thioether and a polyisobutylene as an impact modifier having a compatibility with polyarylene thioether and capable of withstanding a high processing temperature for the polyarylene thioether. The composition can be processed into a molded product excellent in toughness and impact resistance.

Abstract: A film having high lubricity and excellent dielectric strength characteristics and containing few fish eyes is obtained by biaxially-stretching a resin composition which has been obtained by radical polymerization of 0.5-80 parts by weight of a monomer component composed principally of a styrene monomer in the presence of 100 parts by weight of particles of a substantially straight-chain poly(arylene sulfide) having a melt viscosity of at least 1,000 poises.

Abstract: Disclosed herein are stretched poly(arylene thioether) block copolymer films and a 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 melt-stable thermoplastic resin compositions comprising (A) 100 parts by weight of a particular poly(arylene thioether) block copolymer, (B) --400 parts by weight of at least one of thermoplastic resins, and (C) 0-400 parts by weight of at least one filler per 100 parts by weight of the resin components. At least either one of Component (B) and Component (C) is contained in a proportion of at least 0.1 part by weight per 100 parts by weight of Component (A). The poly(arylene thioether) block copolymer alternately comprise at least one poly(arylene thioether-ketone) block having predominant recurring units of the formula ##STR1## wherein the --CO-- and --S-- are in the para position to each other and at least one poly(arylene thioether) block having predominant recurring units of the formula ##STR2## Also disclosed are compositions obtained by stabilizing by the melt-stable thermoplastic resin compositions with a basic compound and products molded or formed product from these compositions.

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: 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.