Process for producing polymer foam and polymer foam
AssigneeNitto Denko Corporation
InventorsTomohiro Taruno, Takayuki Yamamoto
Life of this patent
Estimating the term…
Abstract
A process for producing a polymer foam, which comprises (I) a melting step of melting a thermoplastic resin composition by heating, (II) a gas feed step of quantitatively feeding an inert gas into the molten resin composition, (III) a kneading step of mixing and kneading the inert gas and the molten resin composition, (IV) a cooling step of cooling the kneaded material, and (V) a specific expansion step of expanding the cooled kneaded material.
Claims10
A process for producing a polymer foam, which comprises the following production steps:
- (I) a melting step of melting a thermoplastic resin composition by heating,
- (II) a gas feed step of quantitatively feeding an inert gas into the molten resin composition,
- (III) a kneading step of mixing and kneading the inert gas and the molten resin composition,
- (IV) a cooling step of cooling the kneaded material, and
- (V) an expansion step of expanding the cooled kneaded material, wherein the expansion step (V) comprises (V-a) a cell creating step of creating cells and (V-b) a foam forming step of performing growth of the formed cells and smoothening of the surfaces thereof.
A die used in producing a polymer foam, which comprises a cell creating section formed by drawing a resin passage and a foam forming section of performing growth of created cells and smoothening of the surfaces thereof.
Dependencies are inferred from the claim text.