Loading patent…
AssigneePolyplastics Co., Ltd.
InventorsAyako Migita, Kenji Hijikata
Estimating the term…
A fibrillar copolyester having excellent heat resistance, a reinforcing effect and a large aspect ratio is produced with high dimensional stability and efficiency. A specific fibrillar copolyester having an aspect ratio of at least 3.0 is produced by polymerizing with shearing specific hydroxy aromatic carboxylic acid monomers as starting materials in a nonpolar solvent having 10 or more carbon atoms. Such hydroxy aromatic carboxylic acid monomers preferably have acetylated hydroxyl groups when copolymerized. Additionally, substituents other than hydrogen atoms optionally may be present on the rings of the aromatic monomers when forming the fibrillar copolyester.
A process for producing a fibrillar copolyester having an aspect ratio of at least 3.0, comprising copolymerizing with shearing at least two different hydroxy aromatic carboxylic acid monomers selected from the group consisting of parahydroxybenzoic acid, 2-hydroxy-6-naphthoic acid, and 4'-hydroxy-4-biphenylcarboxylic acid wherein one or more of said monomers optionally possess hydroxyl groups that are acetylated while present in a nonpolar solvent having 10 or more carbon atoms.
A process for producing a fibrillar copolyester having an aspect ratio of at least 3.0, comprising copolymerizing with shearing at a stirrer rotation speed of at least 80 rpm at least two different hydroxy aromatic carboxylic acid monomers selected from the group consisting of parahydroxybenzoic acid, 2-hydroxy-6-naphthoic acid, and 4'-hydroxy-4-biphenylcarboxylic acid, while present in a nonpolar solvent selected from the group consisting of liquid paraffin and diphenyl ketone.
Dependencies are inferred from the claim text.