Micro powder and method for producing the same
AssigneeSumitomo Chemical Company, Limited
InventorsSatoshi Okamoto, Manabu Hirakawa
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Abstract
An object of the present invention is to provide a micro powder capable of producing a thin film with precision thickness. This object is achieved by a micro powder having an average particle size of from 0.5 to 50 μm, obtained by grinding a liquid crystalline polyester having a flow beginning temperature of from 200° C. to 270° C.
Claims16
A micro powder having an average particle size of from 0.5 to 50 μm, obtained by grinding a liquid crystalline polyester having a flow beginning temperature of from 200° C. to 270° C., wherein said liquid crystalline polyester is at least one selected from the group consisting of:
- (i) a polymer consisting essentially of a repeating unit derived from aromatic hydroxycarboxylic acids, a repeating unit derived from aromatic dicarboxylic acids and a repeating unit derived from aromatic diols,
- (ii) a polymer consisting essentially of repeating units derived from different aromatic hydroxycarboxylic acids,
- (iii) a polymer prepared by reaction of polyethylene terephthalate with aromatic hydroxycarboxylic acids, and
- (iv) at least one polymer according to (i), (ii), or (iii) provided that in place of said aromatic hydroxycarboxylic acids, aromatic dicarboxylic acids and aromatic diols, ester derivatives thereof are used.
A method for producing a micro powder having an average particle size of from 0.5 to 50 μm comprising grinding a liquid crystalline polyester having a flow beginning temperature of from 200° C. to 270° C. and obtaining the micro powder, wherein said liquid crystalline polyester is at least one selected from the group consisting of:
- (i) a polymer consisting essentially of a repeating unit derived from aromatic hydroxycarboxylic acids, a repeating unit derived from aromatic dicarboxylic acids and a repeating unit derived from aromatic diols,
- (ii) a polymer consisting essentially of repeating units derived from different aromatic hydroxycarboxylic acids,
- (iii) a polymer prepared by reaction of polyethylene terephthalate with aromatic hydroxycarboxylic acids, and
- (iv) at least one polymer according to (i), (ii), or (iii) provided that in place of said aromatic hydroxycarboxylic acids, aromatic dicarboxylic acids and aromatic diols, ester derivatives thereof are used.
Dependencies are inferred from the claim text.