Method for preparation of colored porous polytetrafluoroethylene material
AssigneeSumitomo Electric Industries, Ltd.
InventorShin-ichi Kanazawa
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Abstract
A colored porous polytetrafluoroethylene material prepared by impregnating a colorant in a porous polytetrafluoroethylene material having a fine fiber structure consisting of fibers and nodes connected to one another through the fibers, and then heating the porous material at a temperature of at least a melting point of the porous material has porosity inherently possessed by the porous material and no distortion of a colored line.
Claims15
A method for preparing a colored porous polytetrafluoroethylene material which comprises the steps of:
- a) impregnating a porous polytetrafluoroethylene material with a colorant, said material having a structure comprising fibers and nodes connected to one another through the fibers;
- and
- b) heating at least a portion of the porous material impregnated with the colorant at a temperature of at least a melting point of the porous material to form convex regions and concave regions on the porous material, an amount of the nodes in the concave regions being greater than an amount of the nodes in the concave regions, wherein the colorant being substantially confined in the convex regions.
A method for preparing a colored porous polytetrafluoroethylene material which comprises the steps of:
- a) heating a porous polytetrafluoroethylene material having a structure comprising fibers and nodes connected to one another through the fibers to calcine the porous polytetrafluoroethylene material;
- b) impregnating the porous polytetrafluoroethylene material with a colorant;
- and
- c) heating at least a portion of the porous material impregnated with the colorant at a temperature of at least a melting point of the porous material.
Dependencies are inferred from the claim text.