Abstract: A resin composition for optical fiber loose tubes contains (A) 100 parts by weight of polybutylene terephthalate having a terminal carboxyl group concentration of 10 eq/ton or less and an intrinsic viscosity of 1.0 to 1.2. and (B) 0.005 to 0.1 part by weight of polyethylene wax. The optical fiber loose tube is produced by extrusion molding at a haul-off speed of 200 m/min or more a resin composition for optical fiber loose tubes. The resin composition containing (A) 100 parts by weight of polybutylene terephthalate having a terminal carboxyl group concentration of 10 eq/ton or less and an intrinsic viscosity of 1.0 to 1.2, and (B) 0.005 to 0.1 part by weight of polyethylene wax.

Abstract: The present invention relates to a silicon wafer carrier consisting of a composition composed of (a) 100 parts by weight of a polyester, (b) 5 to 100 parts by weight of a polyether ester amide, (c) 10 to 2,500 ppm (based on the polyether ester amide) of an alkaline metal and (d) 0 to 40 parts by weight of a modified polyolefin, generating not more than 10 ppm of volatile gas by the heat-treatment at 150° C. for 60 minutes and eluting not more than 10 ppm of the alkaline metal by the immersion treatment in pure water at 80° C. for 120 minutes. The silicon wafer carrier has the generation of volatile gas and the elution of metal suppressed to an extent not to essentially cause the surface contamination of a silicon wafer and is provided with excellent permanent antistaticity and high mechanical properties and heat-resistance.

Abstract: The present invention relates to a silicon wafer carrier consisting of a composition composed of (a) 100 parts by weight of a polyester, (b) 5 to 100 parts by weight of a polyether ester amide, (c) 10 to 2,500 ppm (based on the polyether ester amide) of an alkaline metal and (d) 0 to 40 parts by weight of a modified polyolefin, generating not more than 10 ppm of volatile gas by the heat-treatment at 150° C. for 60 minutes and eluting not more than 10 ppm of the alkaline metal by the immersion treatment in pure water at 80° C. for 120 minutes. The silicon wafer carrier has the generation of volatile gas and the elution of metal suppressed to an extent not to essentially cause the surface contamination of a silicon wafer and is provided with excellent permanent antistaticity and high mechanical properties and heat-resistance.

Abstract: A thermoplastic resin composition having laser marking ability, which comprises a thermoplastic resin and at least two kinds of metal oxides, the content of total metal oxides being 0.001 to 10 parts by weight per 100 parts by weight of said thermoplastic resin; and a keyboard having keys composed of the above composition.

Abstract: The arylene sulfide ketone copolymers according to the present invention have mainly recurring units which are represented by formulas (I) and (II), ##STR1## The arylene sulfide ketone copolymers have a high glass transition point and excellent moldability and can be produced with industrial advantage.

Abstract: A gas separation film comprising a perm-selective layer which is formed by reaction in situ of a Schiff base metal complex compound represented by the following formula (I) ##STR1## wherein rings A and B each represent an o-phenylene or o-naphthylene group which may be substituted by at least one group selected from the class consisting of halogen atoms and groups of the formula --X-R in which R represents a saturated or unsaturated aliphatic hydrocarbon group having not more than 22 carbon atoms and X represents a direct bond or a binding member between R and ring A or B, selected from the class consisting of --O--, --COO--, --NHCO-- and --S--, R.sub.o represents a hydrocarbon group having not more than 6 carbon atoms in which adjacent carbon atoms or adjacent carbon atoms via one carbon atom are bound to bonds a and b, and M represents a metal selected from the group consisting of Fe, Co, Cu, Ni, Mn, Cr and Zn,with a polymeric ligand.

Abstract: A Schiff base metal complex compound represented by formula (I) ##STR1## wherein rings A and B each denote an o-phenylene or o-naphthylene group having at least one long-chain hydrocarbon group represented by formula --X--C.sub.n H.sub.m (14.ltoreq.n.ltoreq.22, 21.ltoreq.m.ltoreq.45) in which X denotes a binding group between --C.sub.n H.sub.m and the ring A or B, such as --O--, --COO--, --NHCO-- or --S--,R.sub.0 denotes a hydrocarbon group having not more than 6 carbon atoms, whose adjacent carbon atoms or adjacent carbon atoms via one carbon atom are bound to bonds a and b, andM denotes a metal selected from the group consisting of Fe, Co, Cu, Ni, Mn, Cr and Zn,an organometallic ultrathin film composed mainly of said compound, an oxygen separation film having a layer composed mainly of said compound and a process for producing the same.

Abstract: The present invention relates to low alloy steel and specifically to nickel-chrome-molybdenum steel.A low alloy steel having excellent stress corrosion cracking resistance containing C:.ltoreq.0.40%, Si:.ltoreq.0.15%, Mn:.ltoreq.0.20%, P:.ltoreq.0.010%, S:.ltoreq.0.030%, Ni: 0.50 to 4.00%, Cr: 0.50 to 2.50%, Mo: 0.25 to 4.00% and V:.ltoreq.0.30%, said Si, Mn and P being fulfilled with relationship of Si+Mn+20P.ltoreq.0.30%, the remainder comprising Fe and unavoidable impurities, the prior austenite crystal grain size being in excess of 4 of ASTM crystal grain size number.

Abstract: A module comprising a plurality of members for obtaining a gas having a specified gas concentrated therein from a mixture of at least two gases, each of said members comprising (a) a solid support plate and (b) a composite film comprised of a porous sheet-like material and one or a plurality of ultrathin solid membranes supported on the porous sheet-like material with a thickness of about 50 to about 5000 .ANG..

Abstract: High Mn-Cr non-magnetic steel having good resistance to stress corrosion cracking, which consists essentially of the following elements in percentage by weight:0.05-0.18% of carbon;up to 1.0% of silicon;16-25% of manganese;14-17% of chromium;0-0.8% of vanadium0.3-0.6% of nitrogen;0.06-0.3% of nickel; andthe balance of iron and inevitable impurities.

Abstract: A process for producing ultrathin solid membranes from a solvent solution of an addition polymer derived from an ethylenically unsaturated hydrocarbon monomer or a conjugated unsaturated hydrocarbon monomer in a solvent composed mainly of a volatile, substantially water-immiscible organic liquid medium capable of dissolving the addition polymer and another organic compound having a distribution coefficient k, which is the ratio of the concentration of the other organic compound in the organic liquid medium to that in water, of from 0.5 to 35. The solvent satisfies the equationc.sub.1 -(a.sub.1 +b.sub.1).gtoreq.25wherein c.sub.1 is the surface tension (dynes/cm) of water, a.sub.1 is the surface tension (dynes/cm) of the solution of the addition polymer in the solvent, and b.sub.1 is the interfacial tension (dynes/cm) between the solvent solution and water.

Abstract: An ultrathin solid membrane is composed substantially of a silicon-containing copolymer consisting substantially of recurring units derived from a silicon-containing allyl monomer and an ethylenically unsaturated monomer and/or a diene monomer. The ultrathin solid membrane is useful for obtaining a specified gas, such as oxygen, in a concentrated state, from a mixture of two or more gases, such as air.

Abstract: A novel composition comprising 100 parts by weight of an aromatic polyester, 5 to 150 parts by weight of powdery feldspar and optionally 5 to 120 parts by weight of a plate-like inorganic filler such as glass flakes and/or 1 to 100 parts by weight of a rubbery elastomer such as acrylic rubber. Up to a half of the powdery feldspar may be replaced by another pulverulent inorganic filler such as talc. The composition is useful as engineering plastics because it gives molded articles having high impact strength and heat distortion temperatures and reduced warping.