Process for coloring expandable polystyrene beads

Details Process for coloring expandable polystyrene beads Process for coloring expandable polystyrene beads

1989-03-24

1990-12-25

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Nontextile, dyeing process or product, including inorganic...

Olefin polymer substrate or rubber

8475, 8513, C08J 320, C08J 922, C08L 2504

Patent

active

049799630

ABSTRACT:
This invention provides a process for coloring expandable beads of polystyrene resins which comprises suspending expandable beads of a polystyrene resin and a dye in water in a closed vessel and heating this aqueous suspension at a temperature above the softening point of the expandable beads, wherein the closed vessel is filled up almost completely with the aqueous suspension and heating is conducted without further addition of any blowing agent, whereby the expandable beads are impregnated uniformly with the dye. According to this process, uniformly colored expandable beads of polystyrene resins are obtained at a high efficiency of dye impregnation without using any impregnation aid or the like, the expandable beads being capable of forming beautiful molded foams of uniform color.

REFERENCES:
patent: 4950303 (1990-08-01), Ishii

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