Patent Number: 6,167,892

Title: Method for washing prefoamed particles

Abstract: A method of washing pre-expanded particles having a substantially water insoluble inorganic compound attached thereto by contacting the pre-expanded particles with an aqueous washing solution of a water soluble compound. The water soluble compound has a solubility with water of at least 1 g/100 g of water and has 1-500 surface bonding functional groups and 1-500 hydrophilic functional groups. At least one of the surface bonding functional groups of the water soluble compound attaches to the water insoluble inorganic compound.

Inventors: Iwamoto; Tomonori (Hyogo, JP), Yamaguchi; Takema (Hyogo, JP), Yamaguchi; Minori (Hyogo, JP)

Assignee: Kaneka Corporation

International Classification: B29C 44/34 (20060101); C08J 9/224 (20060101); C08J 9/00 (20060101); B08B 003/04 ()

Expiration Date: 01/02/2018