Mitsui Chemicals, Inc.

Junji Tan

Seiji Ota

Yasuhiro Mutou

Norio Kashiwa

Tadahito Nobori

Tomoaki Matsugi

Satoru Moriya

Ryoji Mori

Shinichi Kojoh

Shoji Obuchi

Hideyuki Kaneko

Taku Koda

Toyoaki Sasaki

Shuichi Murakami

Kazuo Wakimura

Shunichi Hama

There is provided by the present invention a polyester resin composition containing a copolyester having hydroxy carboxylic acid units as constituent units or a polyoxycarboxylic acid, wherein hydroxy carboxylic acid units of 5 or less carbon atoms are contained in amounts of 2 to 75% by mol based on 100% by mol of all the constituent units contained in the composition, and a molar ratio Sof hydroxy carboxylic acid units both of whose neighboring units are hydroxy carboxylic acid units to all the hydroxy carboxylic acid units contained and a molar ratio Sof hydroxy carboxylic acid units neither of whose neighboring units is a hydroxy carboxylic acid unit to all the hydroxy carboxylic acid units contained satisfy the following formula:0.03&#x3c;&#x3c;30. In the present invention, the amount (% by mol) of the hydroxy carboxylic acid contained in the polymer is in the specific range, and a molar ratio S/Sof continuously bonded hydroxy carboxylic acid units to isolated hydroxy carboxylic acid units is in the specific range, and hence, a resin composition having excellent gas barrier properties and a good balance among mechanical properties, heat resistance, transparency and hue can be provided. The resin composition can be favorably used for packaging materials requiring gas barrier properties, for example, food packaging materials, such as films and blown contains, and electronic part packaging materials.

Polyester resin composition

A resin modifier (C) obtained by reacting a polyolefin (A) having a group which reacts with a carbodiimide group, and a carbodiimide group-containing compound (B), wherein the content of the carbodiimide group is from 1 to 200 mmol per 100 g of the resin modifier, and a polar group-containing polymer composition (F) comprising from 1 to 30% by weight of the resin modifier (C), from 99 to 20% by weight of a polar group-containing polymer (D), and from 0 to 80% by weight of an olefin polymer (E). The modifier can provide improved low-temperature impact resistance of a polymer alloy including a polar group-containing polymer and an olefin polymer (such as polylactic acid and polypropylene), and can provide a molded article with smooth surface when the polymer alloy is molded. A polar group-containing polymer composition is also set forth.

Resin modifier and polar group-containing polymer composition containing the same

Olefin block copolymers (A-1) are disclosed represented by the formula (I) PO-g-B. . . (I) wherein POis a segment comprised of repeating units derived from an olefin having 2 to 20 carbon atoms, gis an ester, ether, amide, imide, urethane, urea, silylether or carbonyl linkage, and Bis a segment containing an unsaturated hydrocarbon or a hetero atom. The olefin block copolymers are suitable for uses in adhesives, various molded articles such as construction and civil engineering materials, automobile interior and exterior materials, gasoline tanks, electric and electronic parts, medical care and sanitation materials, materials of miscellaneous goods, resin materials having environmental degradation properties, films and sheets, modifiers and dispersions.

Olefin block copolymers, processes for producing the same and uses thereof

The present invention provides a polyester resin which comprises (a-1) 45 to 99% by mole of an oxycarboxylic acid unit having 5 carbon atoms or less, (a-2) 0.5 to 27.5% by mole of an aromatic dicarboxylic acid unit, and (a-3) 0.5 to 27.5% by mole of an aliphatic diol unit having 4 carbon atoms or less, and containing (a-1) to (a-3) in a total amount of 95% by mole or greater, wherein the relationship between the content of the oxycarboxylic acid, expressed as M % by mole, and the density &#x3c1; (kg/m) of the polyester resin, satisfies the formula &#x3c1;&#x2267;1349+M&#xd7;0.85.

Polyester resin and polyester resin laminate container

Resin composition and use thereof

Growing community of inventors

Sodegaura, Japan

Junji Tan