Teijin Limited

Other

Michikage Matsui

Makoto Yoshida

Sadamitsu Murayama

Kohichi Iohara

Kiyotaka Ozaki

Hiroshi Honna

Masanori Wada

Osamu Wada

Akio Kimura

Motoyasu Nakanishi

Mikio Tashiro

Norihiro Minemura

Ryoji Tsukamoto

Shoji Makino

Hiroyuki Mori

Nobuo Okawa

Osamu Makino

Shozaburo Hiratsuka

Yasuo Yamamura

Hideki Nitta

Satoshi Maeda

Shigeru Ishihara

Kazuhiro Morishima

A heat-resistant fiber paper sheet which is formed from staple fibers made from a heat-resistant organic polymer, undrawn or low ratio drawn para-aromatic polyamide staple fibers, and an organic resin binder and/or fibrids comprising a heat-resistant organic polymer as main components, wherein the amount of said staple fibers is 45 to 97 percent by weight based on the total amount of said heat-resistant fiber paper sheet; the total amount of said organic resin binder and/or said fibrids is 3 to 55 percent by weight based on the total amount of said heat-resistant fiber paper sheet; and said organic resin binder is cured, and/or said undrawn or low ratio drawn para-aromatic polyamide staple fibers and said fibrids are partially softened, deformed and/or melted to exhibit the actions of binders. The obtained heat-resistant fiber paper sheet has excellent heat resistance, excellent heat dimensional stability, excellent plybond strength, an excellent electric insulating property in a high humidity, and the like, has good resin impregnability in spite of having a high bulk density, and is especially suitable for use as a substrate for electric insulating materials or as a substrate for laminates used for electric circuits.

Heat-resistant fibrous paper

Nonwoven fabric made from filaments and artificial leather containing it

Water vapor-permeable, waterproof fabric

A wholly aromatic polyamide (aramid) fiber synthetic paper sheet includes 70-96 wt % of an aramid staple fiber component which includes 30 wt % or more of a para-type aramid staple fibers each having two or more annular projections spaced from each other and having an average ratio R/&ggr; of the largest diameter R of the annular projections to the smallest diameter &ggr; of the annular projection-free portions of the staple fiber, of 1.1 or more, and 4-30 wt % of a binder component, namely a resinous binder and/or heat resistant fibrids.

Wholly aromatic polyamide fiber synthetic paper sheet

A heat resistant fiber sheet composed of staple fibers consisting of a heat resistant organic high molecular polymer and fibrids consisting of a heat resistant organic high molecular polymer as main components, having excellent heat resistance, dimensional stability to heat, interlaminar peeling strength, electric insulation resistance under a high humidity, etc., and also good resin impregnating property in spite of having a high bulk density, and especially suitable for a base substrates for an electric insulating material and a laminate for an electric circuit, is obtained by setting the amount of the staple fibers occupying in the total amount of the sheet as 40 to 97% by weight and the amount of the fibrids as 3 to 60% by weight and partially softening and/or melting the fibrids so as to act as a binder.

Heat-resistant fiber paper

Aromatic polyamide fibers which have a crystalline structure having (1) crystal size (A) in a (110) plane of 7.5 nm, (2) crystal size (B) in a (200) plane of 8.2 nm and (3) a product A&times;B of 61.50 to 630.00, and exhibit a thermal linear expansion coefficient of &minus;1.0&times;10,/&deg; C. to &minus;7.5&times;10,/&deg; C. and thus a high dimensional stability even upon moisture-absorbing and desorbing, are useful for forming a resin-reinforcing fiber sheet, a pre-preg containing the fiber sheet, and a laminate for, for example, an electric insulating material or electric circuit board, having an excellent cutting, shaving, perforating or laser processability and capable of forming a smooth cut, shaved or perforated face.

Wholly aromatic polyamide fibers, a sheet comprising same and method of producing the sheet

A biodegradable cellulose acetate foam with a foam cell size of 0.001-0.8 mm and an apparent density of 0.01-0.27 g/cm,, and a biodegradable cellulose acetate foam wherein the foam is treated with a weak alkali solution, and has an acetylation degree of 45-60% and no acetic acid odor.

Biodegradable cellulose acetate foam and process for its production

Non-impregnated type substrate useful as base fabric for artificial

Aromatic polyamide flat yarn

Surface frictional characteristics of a wholly aromatic polyamide fiber are desirably modified by applying to the fiber at least 0.05% by weight, based on the fiber, of a reaction product of a polyoxyethylene adduct of glyceride having at least one hydroxyl group in the molecule with a dibasic acid and/or a dibasic anhydride. Preferably, prior to the application of the reaction product, at least 0.01% by weight of an inorganic compound powder is applied to the fiber.

Wholly aromatic polyamide fiber

An undrawn polyester yarn comprising 0.2 to 10% by weight of a polymer having a recurring unit structure represented by the following formula (1): ##STR1## wherein R.sub.1 and R.sub.2 stand for substituents consisting of optional atoms selected from C, H, N, O, S, P and halogen atoms, with the proviso that the sum of the molecular weights of R.sub.1 and R.sub.2 is equal to or more than 40, and n is a positive integer, and having a molecular weight equal to or more than 1000, the elongation increase ratio (I) of the undrawn polyester yarn, represented by the following formula (2), being equal to or more than 8%: ##EQU1## wherein EL.sub.b stands for the residual elongation (%) of the undrawn yarn and EL.sub.o stands for the residual elongation (%) of a corresponding undrawn polyester yarn substantially free of the polymer represented by the formula (1).

Undrawn polyester yarn and process for manufacturing

A high twist polyester multifilament yarn having a twist of a twist multiplier K within a range between 15,000 and 25,000, made from polyester filaments consisting essentially of a copolymer of two or more monomers selected from the group consisting of ethylene terephthalate, trimethylene terephthalate and tetramethylene terephthalate and/or a blend of two or more polymers of the respective monomers and having a breaking elongation of not more than 60% and a shrinkage in boiling water of not more than 6%. A woven or knitted crepe fabric obtained by employing such a high twist yarn has a desirable pebble configuration.

High twist polyester multifilament yarn and fabric made therefrom

A polyester multifilament consisting essentially of a filament groups (I) and (II). The filament group (I) is composed of a polyester selected from the group consisting of polyethylene terephthalate, polytrimethylene terephthalate and polytetramethylene terephthalate, and/or a blend and/or copolymer comprising at least two members selected from the polyesters. The filament group (II) is composed of a substrate composed of a polyester selected from the group consisting of polyethylene terephthalate, polytrimethylene terephthalate and polytetramethylene terephthalate, and/or a blend and/or a copolymer comprising at least two members selected from the polyesters and at least one polymer selected from the group consisting of styrene type polymers, methacrylate type polymers and acrylate type polymers, which is added to said substrate in an amount of 0.4 to 8% by weight based on the substrate.

Polyester multifilament yarn and a process for manufacturing the same

A polyester multifilament consisting essentially of filament groups (I) and (II). The filament group (I) is composed of a polyester selected from the group consisting of polyethylene terephthalate, polytrimethylene terephthalate and polytetramethylene terephthalate, and/or a blend and/or copolymer comprising at least two members selected from the polyesters. The filament group (II) is composed of a substrate composed of a polyester selected from the group consisting of polyethylene terephthalate, polytrimethylene terephthalate and polytetramethylene terephthalate, and/or a blend and/or a copolymer comprising at least two members selected from the polyesters and at least one polymer selected from the group consisting of styrene type polymers, methacrylate type polymers and acrylate type polymers, which is added to said substrate in an amount of 0.4 to 8% by weight based on the substrate.

Process for manufacturing a polyester multifilament yarn

A hollow polyester fiber with excellent antistatic properties composed of a single polymeric component and having a hollow extending along the longitudinal axis thereof and in which the hollow ratio is at most 15%, which fiber contains (a) a polyoxyalkylene glycol substantially non-reactive with said polyester and (b) an ionic antistatic agent, dispersed through the fiber in an amount of at most 3% by weight based on the weight of the fiber, and wherein the polyoxyalkylene glycol (a) is predominantly dispersed in a core portion of the fiber in a high density. The fiber also has excellent tensile strength, resistance to fibrillation and dyeing properties.

Growing community of inventors

Ibaraki, Japan

Michikage Matsui