Manufacture of raw polyester master polymer

Abstract

Abstract PURPOSE:To enable to manufacture a polyester master polymer which is obtained by dispersing a pigment highly uniformly and has a high concentration of pigment, by kneading with rotational power of specific magnitude by limiting a scope of the mixture ratio between polyester and the pigment at a first step. CONSTITUTION:At the first kneading step, it is necessary to set the mixture ratio between polyester and pigment at a weight ratio of 60:40-40:60. Kneading is performed further at the second step; it is desirable to set the concentration of pigment at this time at 10-40wt%. With this construction, the dispersability of pigment can be improved and it is possible to lower the temperature of the polyester raised through shearing force at the time of kneading at the first step and to control thermal decomposition. It is necessary to make rotational power at the time of the kneading more than 0.03kW per 1kg of a kneading thing. With this construction, at the low rotational power, dispersion of the pigment becomes insufficient because of lack of shearing force. However, it is wastefulness in energy to raise the rotational power excessively and the rotational power to the extent of 0.07-0.2kW is desirable.

Inventors

• 👤 Masuo Murai
• 👤 益夫 村井
• 👤 Yu Amano
• 👤 天野　祐
• 👤 Yoshito Koike
• 👤 小池　義人

Bibliographic Details