Teijin Limited

Toshitsugu Matsuki

Noritsugu Saiki

Toshihiro Santa

Shingo Emi

Tsutomu Kiriyama

Jiro Sadanobu

Masaaki Tsukioka

Masayuki Hayashi

Kazumi Ohkawa

Osamu Makino

Thermoplastic resin composition containing amorphous polyimide

An aromatic polyamide filament includes extremely fine inorganic material having a high refractive index of 2.0 or more and an extremely fine average particle size of 0.3 .mu.m or less and dispersed, in an amount of 0.1 to 5% based on the total weight of the filament, in at least a surface portion of an aromatic polyamide filament matrix; has an individual filament thickness of 0.5 to 50 deniers, a tensile strength of 18 g/d or more, an ultimate elongation of 3.5% or more and an initial modulus of 450 g/d; and exhibits an enhanced weathering resistance derived from the high ultraviolet ray-reflecting, shielding and absorbing properties of the extremely fine inorganic particles dispersed in the filament matrix.

Aromatic polyamide filament having an enhanced weathering resistance

An aromatic o-hydroxyamide compound of the formula (I) ##STR1## wherein the formula: ##STR2## is a divalent aromatic group the formula: ##STR3## R.sup.1 =H, halogen, C.sub.1-10 alkyl group, or C.sub.1 -alkoxyl group, Ar.sub.1, Ar.sub.2, Ar.sub.3 =a divalent aromatic groups, X, Y=O or S, and n=0 or 1, has an excellent ultraviolet ray-absorption and heat-resistance and is useful for enhancing an ultraviolet ray-resistance of polymeric materials, for example, wholly aromatic polyamide fibers.

Ultraviolet ray-absorbing aromatic compound and polymeric composition

A polyester block copolymer having an inherent viscosity of at least 0.6, which comprises (A) 30 to 90% by weight of polyester segments comprising a benzenedicarboxylic acid as the main acid component and a diol having 5 to 12 carbon atoms between the hydroxyl groups as the main glycol component and (B) 70 to 10% by weight of polyester segments comprising an aromatic dicarboxylic acid as the main acid component and ethylene glycol, trimethylene glycol, tetramethylene glycol or 1,4-cyclohexane dimethanol as the main glycol component, wherein (i) when a polyester having an inherent viscosity of at least 0.6 is formed by polycondensation of the components constituting the polyester segments (A), the melting point of the obtained polyester is lower than 50.degree. C. or the obtained polyester is amorphous, and (ii) when a polyester having an inherent viscosity of at least 0.6 is formed by polycondensation of the components constituting the polyester segments (B), the melting point of the polyester is higher than 180.degree. C. This polyester block copolymer provides an elastic yarn having a high elastic recovery and a high heat resistance.

Polyester block copolymer and elastic yarn composed thereof

A phosphazene polymer carrier is prepared that has functional groups capable of binding a biologically active substance such as an enzyme or antibody and groups which are non-reactive and hydrophilic. A bifunctional aldehyde is reacted with primary amino groups of a shaped phosphazene polymer to form side chains having aldehyde groups, an amino group-containing compound is reacted with a portion of the aldehyde groups to produce the groups that are non-reactive and hydrophilic, and aldehyde groups not reacted are capable of binding a biologically active substance. The phosphazene polymer may be crosslinked prior to reacting with the bifunctional aldehyde. In another embodiment, a protecting agent is reacted with a portion of the aldehyde groups to block the aldehyde groups, imino bonds are reduced, a compound having an amino group is reacted with aldehyde groups not blocked to form the groups which are non-reactive and hydrophilic, and the protecting agent is removed to provide aldehyde groups capable of binding a biologically active substance. The non-reactive and hydrophilic groups may also be formed by reacting primary amino groups with formaldehyde or by diazotizing primary amino groups of the polymer followed by hydrolysis to form hydroxyl groups. A biologically active substance immobilized on the polymer can be used to separate a substance that has affinity for the immobilized biologically active substance.

Immobilization of biologically active substances with a polyphosphazene

A light-resistant wholly aromatic polyamide resin composition comprises a light-resisting agent blended to a wholly aromatic polyamide resin and comprising at least one naphthalene ring structure-containing compound of the formula (I): ##STR1## wherein Ar.sub.1, Ar.sub.2, Ar.sub.3 =a divalent organic group, X=an amide bond group (--CONH), Y=an amide bond group or an imide bond group ##STR2## A and B=a monovalent organic group when Y=an amide bond group, or =a divalent organic group when Y=an imide bond group, n=1 to 10, and at least one of Ar.sub.1, Ar.sub.2, Ar.sub.3, A and B has a naphthalene ring structure.

Wholly aromatic polyamide resin composition having enhanced light

A phosphazene polymer for immobilizing biologically active substances such as enzymes is prepared that does not lower activity originally possessed by the biologically active substance and does not contain a functionality which can adsorb undesired substances. The polymer has organic radicals having a functional group capable of binding a biologically active substance and organic radicals which are non-reactive and hydrophilic. The non-reactive and hydrophilic organic radicals are preferably prepared by reacting a side chain of the polymer having a primary amino group with formaldehyde or by diazotizing the primary amino group followed by hydrolysis to form a hydroxyl group. A biologically active substance immobilized on the polymer can be used to separate a substance that has affinity for the immobilized biologically active substance.

Phosphazene polymer for immobilizing biologically active substances

A shaped polyphosphazene article having a modified surface portion thereof and exhibiting a desired property and/or performance comprises a polyphosphazene polymer having at least 50 molar % or more of repeating units of the formula (I): ##STR1## wherein R.sup.1 and R.sup.2 in the first and second side chains --OR.sup.1 and --OR.sup.2 respectively represent, independently from each other, an aliphatic, cycloaliphatic or aromatic radical, and having at least a portion of a surface portion thereof in which at least 5 molar % of the first and second side chains are converted to one or more types of third side chains --OR.sup.3 wherein R.sup.3 represents an aliphatic, cycloaliphatic or aromatic radical and which are different from --OR.sup.1 and --OR.sup.2.

Growing community of inventors

Matsuyama, Japan

Toshitsugu Matsuki