Hiroshima University

Sunallomer Ltd.

Bridgestone Corporation

Daikin Industries, Ltd.

Prospira Corporation

Masamichi Hikosaka

Takeshi Nakajima

Kiyoka Okada

Kaori Watanabe

Koji Yamada

Toshiyuki Fukushima

Akihiro Otsubo

Yoshitaka Tanaka

Ken Okanishi

Junichiro Washiyama

Hideharu Kimura

Kenichiro Iwasaki

Kyouhei Sawaki

Yasuyuki Yamaguchi

Kei Yasui

Shingo Ueno

Mai Ishikawa

Katsumi Nabeshima

Katsuomi Tanahashi

Yuka Akiyama

The present invention achieves higher performance (improvement in, for example, heat resistance, durability, and mechanical characteristics) of polyamide resin by a method which is not dependent on a combination with fibers. According to an embodiment of a polyamide resin member of the present invention, the polyamide resin member contains nano-oriented crystals of polyamide 66, and has a high heatproof temperature (T&#x2248;278&#xb0; C.) and a high melting point (T&#x2248;282&#xb0; C.).

Polyamide resin member and production method therefor

The polyester sheet in accordance with an aspect of the present invention contains crystals of polyester which is a polycondensate of polyvalent carboxylic acid and polyalcohol. The polyester sheet contains nano-oriented crystals which contain crystals of polyester in each of which a polymer chain is highly oriented and each of which has a crystal size of 50 nm or less. A heatproof temperature of the polyester sheet is higher than a temperature that is lower than an equilibrium melting point of the polyester by 80&#xb0; C., and a melting point of the polyester sheet is higher than a temperature that is lower than the equilibrium melting point of the polyester by 40&#xb0; C.

Highly heat-resistant polyester sheet

A method for secondary-molding a polymer nano oriented crystal material in accordance with an embodiment of the present invention includes the steps of: heating the polymer nano oriented crystal material so that the polymer nano oriented crystal material changes into a mobile phase or a melt having a dense entanglement network structure; molding the polymer nano oriented crystal material which changed into the mobile phase or the melt including the dense entanglement network in the step; and cooling the polymer nano oriented crystal material, which has undergone the step, until the polymer nano oriented crystal material changes into an ordered phase.

Method for secondary molding of polymer NANO oriented crystal material

A process and apparatus for manufacturing a crystalline resin film or sheet. This manufacturing apparatus includes: an extruder that melts crystalline resin while supplying it; a gear pump that is provided on the downstream side of the extruder; a die which is provided on the downstream side of the gear pump, and which has a slit-shaped aperture; a cooling apparatus which cools film-shaped or sheet-shaped crystalline resin (A) discharged in a melted state from the die to a temperature which is not less than the crystallization temperature but not more than the melting point; and a pair of pinch rolls that press-roll between them the film-shaped or sheet-shaped crystalline resin (B) which has passed through the cooling apparatus (), wherein the pair of guide rolls are positioned such that the thickness of the film-shaped or sheet-shaped crystalline resin (B) which has passed through the cooling apparatus is between 1.3 and 8.0 times the thickness of the film or sheet (C, D) after it has been press-rolled.

Process and apparatus for producing crystalline resin film or sheet

One embodiment of the present invention provides polymer crystalline materials containing crystals of the polymer and satisfying the following requirements (I) and (II) or the following requirements (I) and (III): (I) the polymer crystalline materials a crystallinity of 70% or greater; (II) the crystals are 300 nm or less in size; and (III) the crystals have a number density of 40 &#x3bc;mor greater. This allows an embodiment of the present invention to provide polymer crystalline materials which are excellent in properties such as mechanical strength, heat tolerance, and transparency or, in particular, polymer crystalline materials, based on a general-purpose plastic such as PP, which is excellent in properties such as mechanical strength, heat tolerance, and transparency.

Polymer crystalline materials

A polymer sheet according to at least one embodiment of the present invention is a polymer sheet whose main component is oriented nanocrystals of a polymer, and which satisfies the following conditions (I), (II), and (III): (I) having a crystallinity of not less than 70%; (II) having a tensile strength at break of not less than 100 MPa and a tensile modulus of not less than 3 GPa; and (III) having an average thickness of not less than 0.15 mm. According to at least one embodiment of the present invention, it is possible to provide a polymer sheet excelling in properties such as mechanical strength, heat tolerance, and transparency, particularly a polymer sheet having excellent properties such as mechanical strength, heat tolerance, and transparency in general-purpose plastics such as polypropylene.

Polymer sheet and method for producing same

A method and means for determining a critical elongation strain rate of a polymer melt, which make it possible to subject a polymer melt to elongation to prepare a bulk oriented melt, are established, and a process for producing bulk polymer oriented crystals and polymer oriented crystals are provided. In the critical elongation strain rate determination process or critical elongation strain rate determining method, a polymer melt () in a disc shape having a radius xand a thickness of &#x394;zis held between transparent plates (an upper transparent plate () and a lower transparent plate ()). The polymer melt () is cooled to a supercooled state and is press in a thickness direction at a constant rate v by using the transparent plates. The critical point radius x*, at which the polymer melt () is turned to an oriented crystal, is measured, and the critical elongation strain rate &#x3b5; is calculated by equation &#x3b5;*=ax*wherein &#x3b1;=v/(2&#x394;zx).

Process for producing polymer oriented crystal, polymer oriented crystal produced by said production process, and method for determining critical elongation strain rate of polymer melt

Growing community of inventors

Higashihiroshima, Japan

Masamichi Hikosaka