Sumitomo Chemical Company, Limited

Tatsuhiro Nagamatsu

Katsuhiro Yamada

Akinobu Sakamoto

Takeo Kitayama

Shigeyoshi Matsubara

Yuki Iseki

Takanori Kume

Tadashi Sakurai

Kaori Tsubouchi

Kazuki Wakamatsu

Ryuma Kuroda

Takashi Chinuki

Haruyuki Suzuki

Hiroki Nakata

Tsuyoshi Moriguchi

Hiroshi Nozawa

Shizuto Yamakoshi

Seiji Shiromoto

Sakae Yamamoto

Tomomi Satoh

Shigehumi Takuno

Miya Nakayama

The present invention relates to a polymer composition comprising 100 parts by weight of an olefin-based polymer, and 0.01 to 100 parts by weight of a branched fatty acid and 0.01 to 200 parts by weight of a releasable active compound per 100 parts by weight of said olefin-based polymer.

Polymer composition and molded articles shaped of the same

A resin composition for pressure-foam molding, which comprises an ethylene-based copolymer and a foaming agent, wherein the ethylene-based copolymer has monomer units derived from ethylene and monomer units derived from an a-olefin having 3 to 20 carbon atoms, has a melt flow rate of 0.01 to 0.7 g/10 minutes, a molecular weight distribution of 5 or more determined by a gel permeation chromatography, an activation energy of flow of 40 kJ/mol or more, and inflection points of 3 or less on a melting curve within temperature range from 25&#xb0; C. to the end point of melting obtained by a differential scanning calorimetry; a foam obtained by press foaming; and a process for producing the foam.

Resin composition for press foaming, foam and process for producing the foam

A copolymer having monomer units derived from ethylene and monomer units derived from an &#x3b1;-olefin of 3 to 20 carbon atoms, a density of 906 to 970 kg/mand an activation energy of flow of 50 kJ/mol or more, and satisfying specific relations among a melt complex viscosity, a melt flow rate and a characteristic relaxation time.

Ethylene-&#x3b1;-olefin copolymer

An ethylene-&#x3b1;-olefin copolymer having monomer units derived from ethylene and monomer units derived from an &#x3b1;-olefin of 3 to 20 carbon atoms, a density of 906 to 970 kg/m, an activation energy of flow of 50 kJ/mol or more and a heat quantity of fusion of a cold xylene soluble part of 30 J/g or more, and satisfying specific relations among a rate of the cold xylene soluble part in the copolymer, the density, a melt flow rate and a characteristic relaxation time.

Ethylene-alpha-olefin copolymer

The invention provides, as a method for producing a multi-layer foamed sheet whose scale-like appearance has been improved by means of a multi-layer circular die coextrusion method, a method for producing a multi-layer foamed sheet having foam layers and non-foam layers by a multi-layer circular die coextrusion method which is a method for producing a multi-layer foamed sheet wherein the shear stress at the interface of each layer is 5000 Pa or higher and not higher than 50000 Pa, a method for producing a multi-layer foamed sheet wherein the resin of said non-foam layer is a linear propylenic resin having a melt flow rate of 5 to 30 g/10 minutes, and a method for producing a multi-layer foamed sheet wherein the resin of said foam layer is a propylenic resin whose melt tension (MT) at 190&#xb0; C. and melt flow rate (MFR) at 230&#xb0; C. satisfy the following equation A:&#x2267;7.52&#xd7;(&#x2212;0.576)&#x2003;&#x2003;[Equation A]

Methods for producing multi-layer foamed sheets

Foamed thermoplastic resin sheet and manufacturing method of the same

An indicator comprising a porous resin material, and a liquid retained in the pores of the porous resin material, in which the whiteness of the porous resin material is at least 80, and the whiteness of the porous resin material is at least 20 larger than that of the indicator. This indicator displays information such as a period through the change of a color tone, and the like, well maintains the displaying properties, and suffers from less variation of displayed periods.

Indicator

A foamed thermoplastic resin sheet manufacturing device is provided with (i) an extruder for melting and kneading a thermoplastic resin and a foaming agent to form a melted/kneaded mixture and extruding the melted/kneaded mixture, (ii) a die which is provided at a front end of said extruder and forms the melted/kneaded mixture into a sheet-like foamy thermoplastic resin material, (iii) a vacuum chamber in which the foamy thermoplastic resin material extruded through said die expands under a reduced pressure, and (iv) a facing-wall section composed of a pair of walls of said vacuum chamber which face each other in a thickness direction of the foamy thermoplastic resin material, at least one of the walls in pair being a movable wall provided so as to move in directions in which said walls approach and separate each other. By this arrangement, foamed thermoplastic resin sheets with various thicknesses can be produced.

Manufacturing device of foamed thermoplastic resin sheet

The present invention relates to a method for producing a foamed article by which a foamed article having a high expansion ratio, having uniform fine cells in a high closed cell ratio and capable of being recycled, which is utilizable as heat insulating materials for construction, cushioning materials for wrapping, cushioning floats for ships, floats for sports and leisure and the like, can be obtained readily and safely using a clean inorganic gas as a foaming agent, and to a foamed article obtained by the method. That is, the present invention provides a method for producing a foamed resin article comprising a melting step of feeding a thermoplastic resin into an extruder and heating it to melt, a kneading step of mixing an inorganic gas with the thermoplastic resin in the extruder to produce a kneaded material, and a foaming step of discharging the kneaded material from a mold having a tubular channel mounted to the end of the extruder to form the foamed article.

Method for producing foamed resin article

Process for producing uncrosslinked polypropylene-based resin foam sheets and uncrosslinked polypropylene-based resin foam sheets

Propylene based resin composition

Laminated sheet

A propylene-based polymer composition obtained by polymerizing a propylene monomer in the presence of a stereoregular olefin polymerization catalyst system in the first stage to produce a crystalline propylene-based polymer(A) having an intrinsic viscosity of 5 dl/g or more, and successively polymerizing a propylene monomer in the second stage to produce a crystalline propylene-based polymer(B) with an intrinsic viscosity of less than 3 dl/g, wherein the content of the (A) is in the range of 0.05% by weight or more and less than 35% by weight in the total of the polymers(A) and (B), and the total of the polymers(A) and (B) has an intrinsic viscosity of less than 3 dl/g and a Mw/Mn of less than 10, and the foamed article thereof.

Propylene-based polymer composition and foamed article thereof

Provided are a resin composition improved in utilization of active compound by controlling the bleeding of the active compound low in vaporizability and a molded product obtained from the resin composition. The resin composition comprises 100 parts by weight of a resin, 0.01-200 parts by weight of an active compound and 0.1-100 parts by weight of a vaporizable plasticizer having a vapor pressure of 0.001 mmHg or higher at 20.degree. C., and the vapor pressure (P1) of the vaporizable plasticizer at 20.degree. C. and the vapor pressure (P2) of the active compound at 20.degree. C. satisfy the formula: P1/P2.gtoreq.2.

Resin composition having active compound and vaporizable plasticizer,

Disclosed in this invention are the slow-releasing medicated resin moldings which are the porous bodies obtained by stretching 1.1-10 times the resin compositions comprising 100 parts by weight of a thermoplastic resin, 50 to 400 parts by weight of a filler and a drug(s) in an amount not less than the saturation dissolution rate for the thermoplastic resin, and a process for producing such slow-releasing medicated resin moldings.

Growing community of inventors

Chiba, Japan

Tatsuhiro Nagamatsu