Nippon Oil Company

Nippon Petrochemicals Company, Limited

Polymer Processing Research Institute Ltd.

Other

Seizo Kobayashi

Takashi Mizoe

Yoshimu Iwanami

Shigeki Yokoyama

Kazuo Matsuura

Kazuhiko Kurihara

Hiroshi Yazawa

Katumi Usui

Akira Sano

Noboru Yamaoka

Takeshi Kamiya

Sumio Yoshida

Kazutosi Nomiyama

Osamu Otsu

Takeichi Shiraishi

Saburo Matsubara

Yoshiyuki Shimo

Hirofumi Kamiishi

Seiju Kezuka

Mihoko Okada

Yoshihiro Gohshi

Katsumi Usui

Keizi Jimbo

Toshiharu Hirayama

Hidesuke Takeuchi

A polyethylene article such as film or fiber having high strength and high elastic modulus is produced by orienting an ultra-high molecular weight polyethylene having an intrinsic viscosity at 135.degree. C. in decalin of 5 to 50 dl/g, said ultra-high molecular weight polyethylene being prepared by homo- or copolymerizing ethylene in the presence of a catalyst system and hydrogen, said catalyst system comprising (1) a solid catalyst component containing at least magnesium, titanium and/or vanadium, (2) an organometallic compound and (3) a compound represented by the following general formula �I!: ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each hydrogen or a hydrocarbon residue, with the proviso that any two of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 may conjointly form a cyclic hydrocarbon residue.

Process for producing polyethylene material of high strength and high

The present invention provides a prepreg obtained by stretching a material including, as a main component, an ultra-high-molecular-weight polyethylene having an intrinsic viscosity of 5-50 dl/g as measured at 135.degree. C. in decalin, to a total draw ratio of at least 20, subjecting the resulting stretched polyethylene material to a splitting treatment, and impregnating the resulting material with a thermosetting resin. The split stretched polyethylene material has improved adhesion to the impregnant resin and can be used as a good base material for prepreg.

Prepreg of ultra-high-molecular-weight polyethylene

The present invention discloses a colored stretched polyethylene material which comprises an ultra-high-molecular-weight polyethylene having an intrinsic viscosity of 5-50 dl/g in decalin at 135.degree. C. and 0.001-50 parts by weight, per 100 parts by weight of the polyethylene, of a dye and/or a pigment and which has been stretched at a temperature lower than the melting point of the polyethylene, and a process for producing said polyethylene material. This colored stretched polyethylene material has a tensile modulus of 120 Gpa or more and a tensile strength of 1.5 GPa or more.

Colored stretched polyethylene material and process for producing the

The present invention provides a prepreg obtained by stretching a material including, as a main component, an ultra-high-molecular-weight polyethylene having an intrinsic viscosity of 5-50 dl/g as measured at 135.degree. C. in decalin, to a total draw ratio of at least 20, subjecting the resulting stretched polyethylene material to a splitting treatment, and impregnating the resulting material with a thermosetting resin, and a process for producing said prepreg. The split stretched polyethylene material has improved adhesion to the impregnant resin and can be used as a good base material for prepreg.

Process for producing prepreg

The present invention provides a split polyethylene stretched material having a tensile strength of at least 0.7 GPa when twisted in the range of 50-500 times/m, which material is produced by subjecting a polyethylene having an intrinsic viscosity of 5-50 dl/g as measured at 135.degree. C. in decalin, i.e. an ultra-high-molecular-weight polyethylene to stretching and then subjecting the stretched polyethylene to splitting, as well as a process for producing said material. The split polyethylene stretched material according to the present invention has a large surface area and accordingly can be easily laminated to other materials, and has a high strength and flexibility.

Split polyethylene stretched material and process for producing the same

An anisotropy-free laminate having much higher strength and stiffness as compared with conventional articles is here disclosed which can be prepared by laminating an orientated ultra-high-molecular-weight polyethylene onto an adhesive layer obtained by modifying an olefin polymer with an unsaturated carboxylic acid and/or its derivative at a temperature lower than the melting point of the orientated ultra-high-molecular-weight polyethylene. The anisotropy-free material having high strength and high stiffness of the present invention can be substituted for various materials such as metals, lumber and FRP, and is also lightweight and excellent in water resistance.

Laminate

According to the present invention, a polyolefin sheet, film or fiber having a high strength and a high modulus can be continuously produced by:

Process for continuous production of polyolefin material

A process is provided for the continuous production of a high-strength and high-modulus polyethylene material having excellent properties. According to the process, powder composed of ultra-high-molecular-weight polyethylene powder as a principal component is subjected to compression molding, rolling and stretching. The polyethylene powder has an intrinsic viscosity of 5-50 dl/g as measured at 135.degree. C. in decalin. The compression molding is carried out by feeding the polyethylene powder between endless belts arranged in an opposing up-and-down relation, and conveying the polyethylene powder while holding the same between the endless belts and at the same time, continuously compression molding the polyethylene powder at a temperature lower than its melting point by a compressing means provided inside of the endless belts. In at least one of the compression molding step and rolling step, an olefin polymer having a molecular weight lower than the polyolefin polymer is concurrently processed.

Process for the continuous production of high-strength and high-modulus

A high-strength and high-modulus polyolefin material can be continuously produced from a polyolefin in a powder form by feeding the polyolefin powder between a combination of endless belts disposed in an up-and-down opposing relation, compression-molding the polyolefin powder at a temperature lower than the melting point of the polyolefin powder by means of a pressing device while holding the polyolefin powder between the endless belts and conveying the same, and then rolling and stretching the resultant compression-molded polyolefin. The pressing device is constructed of pressing platens and corresponding sets of rollers, which are all accommodated within the respective endless belts. The rollers in each set are connected together, and the sets of rollers are arranged movably in an endless fashion between the respective platens and the endless belts associated therewith.

Continuous production process of high-strength and high-modulus

A process for producing a polyethylene material for use in products requiring high mechanical strength and high elastic modulus is disclosed. The process involves the use of a specific class of particulate polyethylenes having an intrinsic viscosity of 5-50 dl/g in decalin at 135.degree. C. and the steps of compression molding, solvent immersing, solid-phase extruding or rolling and finally drawing the material in that order.

Process for the production of polyethylene materials

A method for the preparation of masterbatch compositions for use in thermoplastic resin modification by blending polybutene with an ethylene..alpha.-olefin copolymer which is obtained by copolymerizing ethylene and .alpha.-olefin in the presence of specific catalysts and has specific characteristics such as a density of exceeding 0.910 g/cm.sup.3 and 0.940 g/cm.sup.3 or less, and successively by kneading and extruding the blend in the temperature range from the maximum peak temperature (Tm) to (Tm-45.degree. C.) in accordance with differential scanning calorimetry (DSC).

Preparation method of masterbatch composition for thermoplastic resin

A thermoplastic elastomer composition prepared by crosslinking a composition comprising the following components (A), (B) and (C) by using a phenolic curing agent:

Thermoplastic elastomer compositions

A process for producing polyethylene materials is disclosed in which particulate polyethylene is drawn at lower temperatures than its melting point, the polymer having an intrinsic viscosity of 5-50 dl/g at 135.degree. C. in decalin and resulting from the polymerization of ethylene at temperatures below the above melting point and with use of a selected catalyst. The polyethylene materials excel in mechanical strength and elastic modulus.

A thermoplastic elastomer composition prepared by partially crosslinking a composition comprising the following components (A), (B) and (C):

A thermoplastic elastomer composition prepared by partially crosslinking a composition comprising the following components (A), (B), (C) and (D):

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Yokohama, Japan

Seizo Kobayashi