Teijin Limited

Agency of Industrial Science and Technology

Teitin Limited

Teyin Limited

Takanori Urasaki

Hiroo Inata

Takeo Shima

Wataru Funakoshi

Yasuji Hirabayashi

Shoji Kawase

Takatoshi Kuratsuji

Seiichi Yokoyama

Michiyuki Tokashiki

Makoto Ogasawara

Tsuto Morinaga

Kazuyoshi Suzuki

Takayuki Kobayashi

Iwao Omae

Tugusi Yoshida

Hiroshi Fujimoto

Isao Oka

Polyglycidyl ethers of the formula ##STR1## wherein: G represents hydrogen, ##STR2## R.sup.1 represents a hydrogen atom, an aliphatic, alicyclic, or aromatic hydrocarbon group, or a 5- or 6-membered oxygen or sulfur atom containing heterocyclic group which groups, other than hydrogen, may be substituted by halogen or the group --OG,

Polyglycidyl ethers, process for production thereof, and cured products

A fiber- or film-forming wholly aromatic polyester having melt anisotropy, said polyester consisting essentially of

Melt-anisotropic wholly aromatic polyester and fibers or films thereof

A wholly aromatic copolyester composed mainly of isophthalic acid units and hydroquinone units, the total proportion of said isophthalic acid units and hydroquinone units being at least about 80 mole % based on the entire units, said wholly aromatic copolyester having a terminal carboxyl group concentration, measured by the method described in the specification, of not more than about 90 eq/10.sup.6 g and a reduced viscosity, determined at 35.degree. C. in a mixed solvent of phenol and tetrachloroethane in a weight ratio of 4:6 in a concentration of 1.2 g/dl of at least about 0.6 and being substantially linear and melt-shapable and substantially free from a halogen atom bonded to the molecular chain, and a film prepared therefrom by melt shaping.

Novel wholly aromatic copolyester, process for production thereof, and

A melt-molded film of a wholly aromatic polyester, said film having in its plane two perpendicularly crossing directions in each of which the Young's modulus and strength of the film at 25.degree. C. are at least about 200 kg/mm.sup.2 and at least about 5 kg/mm.sup.2 respectively, the product of the Young's moduli of the film in the two directions being at least 8.times.10.sup.4 (kg/mm.sup.2).sup.2, and said wholly aromatic polyester being substantially linear, having a melt viscosity at about its melting point of at least about 10000 poises, and being composed substantially of recurring units derived from p-hydroxybenzoic acid, recurring units derived from a m- or p-oriented aromatic dicarboxylic acid and recurring units derived from a m- or p-oriented aromatic dihydroxy compound, the proportion of said recurring units derived from p-hydroxybenzoic acid being about 30 to about 70 mole % based on the entire recurring units. This invention provides also a process for producing said film which comprises heating aforesaid wholly aromatic polyester to a temperature above a point at which the polyester is extrusion-moldable and extruding the heated polyester through a slit; and either (i) orienting the extruded film in the extruding direction or machine direction and a direction perpendicular thereto while the heated aromatic polyester resides in said slit or after it has left the slit but before it is cooled to the glass transition temperature of the polyester, of (ii) orienting the extruded film substantially only in the extruding direction or machine direction while the polyester heated at said temperature resides in the slit, or after it has left the slit but before it is cooled to the glass transition temperature of the polyester, and then re-heating the film to a temperature higher than the glass transition temperature of the polyester, and orienting the film in a direction perpendicular to the machine direction.

Biaxially oriented wholly aromatic polyester film

The present invention provides a substantially linear aromatic polyester carbonate consisting essentially of hydroxybenzoic acid unit, hydroquinone unit, and carbonate unit as well as, depending on the circumstances, aromatic carboxylic acid unit, and having an inherent viscosity of at least 0.5. The present invention also provides an industrially advantageous method for producing such linear aromatic polyester carbonate through the process steps of melt-polycondensation, and, if necessary, followed by a further polycondensation in solid phase. Such aromatic polyester carbonate which the present invention provides exhibits excellent melt-forming property and melt anisotropy, hence any shaped article obtained by melt-forming of this aromatic polyester carbonate exhibits superior mechanical properties, in particular, excellent Young's modulus of longitudinal elasticity, and so on, which is highly useful as the material for industrial applications. The present invention also provides shaped articles in fiber and film forms having such excellent Young's modulus of longitudinal elasticity as produced from the abovementioned aromatic polyester carbonate.

Aromatic polyester carbonate and method for producing the same

A process for preparing diesters of carboxylic acids by oxidative carbonylation of C.sub.2 -C.sub.20 olefins, C.sub.1 -C.sub.20 monohydric aliphatic alcohols and carbon monoxide in an atmosphere containing molecular oxygen at a temperature of from room temperature to about 350.degree. C. in the presence of a carrier-supported catalyst containing a platinum group metal, wherein said catalyst comprises, supported on a carrier, a post-reduced compound of a platinum group metal and a post-reduced compound of a metal having an atomic number of not less than 22 selected from the group consisting of metals of Groups Ib, IIb, III, IV, V, VI and VIIb of the periodic table.

Process for preparing diesters of carboxylic acids by catalytic

According to this invention, during the formation of a fiber-forming polyester by the reaction of a dicarboxylic acid or its functional derivative with a glycol, an aromatic ortho-ester such as hexaphenyl ortho terephthalate is added to the molten polyester whereby a fiber-forming polyester of a low content of free carboxyl groups and diethylene glycol units is prepared. Moreover, the reaction rate of the polycondensation is greatly increased by selecting and using a suitable aromatic ortho-ester and thus there can be obtained a fiber-forming polyester of a very high molecular weight.

Process for preparation of polyesters

A process for preparing 2,6-dimethylnaphthalene by the selective isomerization of an isomeric mixture of dimethylnaphthalenes(DMN), characterized in that

Process for preparing 2,6-dimethylnaphthalenes

A process for preparing alkenylbenzenes, which comprises reacting an alkylbenzene with 1,3-butadiene at elevated temperature in the presence of an alkali metal catalyst in the substantial absence of oxygen and moisture, characterized in that said catalyst is composed of 1. 0.0005 to 0.03% by weight, based on the alkylbenzene, of metallic potassium, and 2. metallic sodium in an amount expressed in percent by weight, based on the alkylbenzene, determined by the following relationship (i)

Growing community of inventors

Iwakuni, Japan

Takanori Urasaki