Idemitsu Petrochemical Co., Ltd.

Idemitsu Kosan Company, Limited

Mitsubishi Plastics, Inc.

Masato Kijima

Yutaka Minami

Hideo Funabashi

Takuji Okamoto

Tsuyoshi Ota

Noriyuki Tani

Takashi Kashiwamura

Yasushi Seta

Yasuhiro Mogi

Shuji Machida

Masami Kanamaru

Minoru Sugawara

Tomio Tatsumi

Koki Hirano

Koji Kakigami

Mitsugu Kanzawa

Masayuki Shinohara

Yasuhiro Goto

Shinichi Yukimasa

Masahiko Endo

Takayuki Nakagawa

Kouichirou Mitsubishi Plastics Inc Taniguchi

Hideki Mitsubishi Plastics Inc Sasaki

A propylenic polymer according to the present invention or a composition thereof have an excellent melt flowability and contains a less amount of stickiness-causing components, and also has a low modulus and is pliable, and is capable of providing a transparent molded article, thus being useful as a substitute for a pliable vinyl chloride resin. In addition, a molded article made therefrom exhibits an excellent heat seal performance at a low temperature, and is excellent in terms of transparency and rigidity. Specifically, it has an isotactic pentad fraction (mmmm), which indicates a stereoregulariry, of 30 to 80%, a molecular weight distribution (Mw/Mn) of 3.5 or less and an intrinsic viscosity [&#x3b7;] of 0.8 to 5 dl/g.

Propylene polymer and composition containing the same, molded object and laminate comprising these, and processes for producing propylene polymer and composition containing the same

The present invention relates to a soft polypropylene resin having a melt index falling in a specific range, prepared by melting and kneading a substantial propylene homopolymer or a propylene copolymer composition each having specific properties in the presence of a radical-generating agent. According to the present invention, capable of being provided at a good productivity is a soft polypropylene resin which is useful as an alternative for a polyvinyl chloride resin in the fields of films, sheets, construction materials and the like and which is excellent in fluidity.

Flexible polypropylene resin

Long-chain, branched, propylene-based polymers, of which the melt index and the molecular weight distribution and the melt tension and the limiting viscosity both satisfy specific requirements, have good physical properties that are comparable to or better than those of conventional propylene-based polymers. They have good melt workability and are favorable to large-size blow molding and extrusion foaming. They are favorably used as miscibility improvers for propylene homopolymers and propylene-based copolymers.

Olefin-based polymer

The present invention provides a polyolefin resin for hot melt adhesives containing &lsqb;I&rsqb; a propylene polymer in an amount of 20 to 99 mass %, and &lsqb;II&rsqb; an adhesive capacity applying resin in an amount of 80 to 1 mass %, wherein &lsqb;I&rsqb; the propylene polymer satisfies the requirements of (1) a meso pentad fraction (mmmm) is from 0.2 to 0.6; and (2) a racemic pentad fraction (rrrr) and (1&minus;mmmm) satisfy the relation: &lsqb;rrrr/(1&minus;mmmm)&rsqb;&lE;0.1. The polyolefin resin for hot melt adhesives is superior in thermostability or flowing ability at high-temperature, easy for coating, environmentally friendly with little fear of generating toxic gas in the disposal and incineration, superior in adhesive property to lowly polar substances and in heat resistance of the adhesion face.

Polyolefin resin for hot-melt adhesive

The present invention provides a resin composition for calender formation containing &lsqb;I&rsqb; a propylene polymer in an amount of 1 to 99 mass %, and &lsqb;II&rsqb; an olefin-based polymer in an amount of 99 to 1 mass %, wherein &lsqb;I&rsqb; the propylene polymer satisfies the following requirements of: (1) a meso pentad fraction (mmmm) is 0.2 to 0.6, and (2) a racemic pentad fraction (rrrr) and (1&minus;mmmm) satisfy the following relation: &lsqb;rrrr/(1&minus;mmmm)&rsqb;&lE;0.1. A material for polyolefin-based leather tone product containing a polyolefin resin layer by the use of the resin composition for calender formation is also proposed. According to the resin composition of the present invention, a resin composition for calender formation, a material for polyolefin-based leather tone product being superior in molding ability, being environmentally friendly, with little sticking and being superior in flexibility and transparency are achieved.

Resin composition for calendering and polyolefin material for leather-like article

Olefinic polymer

The invention relates to a propylene-based copolymer and its moldings which are transparent and have good ordinary impact resistance, good cold impact resistance, and well-balanced flexibility and blocking resistance. The propylene-based copolymer comprises from 50 to 90% by weight of a propylene-ethylene copolymer &lsqb;A&rsqb; of such that (1) its ethylene content (&agr;) falls between 0.2 and 10% by weight, (2) the amount of its fraction (Wp) eluted within the temperature range between (Tp&minus;5)&deg; C. and (Tp&plus;5)&deg; C. is at least 20% by weight, with Tp (&deg;C.) being the peak temperature for essential elution in temperature-programmed fractionation chromatography of the copolymer, and (3) the amount of its fraction (W0) eluted within the temperature range not higher than 0&deg; C. in temperature-programmed fractionation chromatography of the copolymer, and &agr; satisfy a relation of W0&lE;(3&plus;2&agr;)/4, and from 10 to 50% by weight of a propylene-ethylene copolymer &lsqb;B&rsqb; having an ethylene content of from 10 to 25% by weight.

Propylene copolymer and molded object obtained by molding the copolymer

There are provided a highly rigid propylenic resin which has a melt index MI in the range of 0.1 to 1.2 g/10 minutes as determined at 230.degree. C. under 2.160 kg load and also satisfies a relationship between the MI and the elongational viscosity �Y(Pa.s)!, said relationship being represented by the expression

Highly rigid propylenic resin and blow molded article made therefrom

Growing community of inventors

Chiba, Japan

Masato Kijima