* Coloring of KEPITAL

 

1. Outline of colorants

  (1) Many articles made of plastics around us are colored.

        Our visual color perception is dependent on the object modifying the light from the source.

        Crystal grains of colorants are diffused in the material(for example, orange) and the light comes to the surface

        while repeating reflection, refraction, scattering, and transmission.

        We will see this refl­ected or transmitted orange light and we say that the object appears orange.

  (2) Colorants can be roughly divided into pigments and dyes.

  (3) It’s not recommended to apply dye to a highly crystalline polymer like polyacetal resin.

  (4) There is a migration problem with dye because it is insoluble in the crystalline region.

  (5) Characteristics of pigments varies according to chemical structure, surface property,

        crystal form/modification, particle size, and particle size distribution.

 

2. Guideline of choosing colorants for KEPITAL
  (1) Colorants can be roughly divided into pigments and dyes. It is not recommended to apply dye to

        polyacetal resin because there are many problems like mold deposits and thermal degradation during processing.

  (2) However, dye can be applied to some specific parts. Dye must have at least some heat stability.

  (3) Polyacetal resin can decompose when using Anatase type(titanium dioxide(TiO₂)), channel type(carbon black)

        and chelate type complex colorants due to their acidity and metal composition.

  (4) One should consider the effects of Phthalocyanine type on polyacetal dimension.

  (5) When using inorganic colorants with organic things, it is recommended to use inorganic colorants under 0.5 wt%, inorganic things 0.1 wt%.

  (6) We recommend using little dispersing agent and stabilizer(under 0.2 wt%) if blending polyacetal and colorants.

  (7) One should use suitable colorants when coloring KEPITAL.

 

* Please refer to attached file below.