Towa Corporation

Japan Fine Ceramics Center

Masato Yoshiya

Satoshi Kitaoka

Keiji Maeda

Takaki Kuno

Naoki Kawashima

Yoshinori Noguchi

Seiichi Suda

Norio Yamaguchi

A low-adhesion material containing a rare-earth element is formed as a layer or a film on a mold surface of a mold for molding a resin. A main component of the low-adhesion material is a rare-earth compound, and YOis used as an example. A content of the rare-earth compound in the low-adhesion material is not less than 40 percent by volume. Thereby, a mold for molding a resin having excellent releasability can be obtained.

Low-adhesion material, mold for molding resin using the same and contaminant adhesion preventing material

A mold surface of an upper mold with which a fluid resin comes into contact has an oxide therein. The oxide contains a metal cation and an ion. Field strength is calculated based on a valence of the metal cation and ionic radius of the ion. Based on predetermined relationship established between a value of the field strength and adhesion strength between a cured resin and the mold surface, releasability between the cured resin and the mold surface is evaluated. Thereby, a method of evaluating releasability between the cured resin and the mold surface is established. With this evaluation method, a material with high releasability can readily be provided. Further, if the material with high releasability is used for the mold surface of the upper mold, a mold for molding a resin having excellent releasability can be obtained.

Method of evaluating adhesion property, low-adhesion material, and mold for molding resin

Growing community of inventors

Nagoya, Japan

Masato Yoshiya