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AssigneeShin-Etsu Chemical Co., Ltd.
InventorsDaisuke KORI, Seiichiro TACHIBANA, Tsutomu OGIHARA, Satoru KITANO, Yukio ABE, Fumihiro HATAKEYAMA, Taiki KOBAYASHI
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The invention provides: a dihydroxynaphthalene condensate which suppresses soft particle generation and is suitably usable for a composition excellent in filterability; and a method for producing the dihydroxynaphthalene condensate, in the method for producing a dihydroxynaphthalene condensate, dihydroxynaphthalene to be used has a sulfur element content of 100 ppm or less in terms of mass among constituent elements. The dihydroxynaphthalene and a condensation agent are condensed in presence of an acid or a base to produce the dihydroxynaphthalene condensate.
A method for producing a dihydroxynaphthalene condensate, wherein
A dihydroxynaphthalene condensate, which is a condensate of dihydroxynaphthalene and a condensation agent, wherein a sulfur element content among constituent elements contained in the dihydroxynaphthalene condensate is 100 ppm or less in terms of mass.
The dihydroxynaphthalene condensate according to claim wherein the condensation agent is formaldehyde, paraformaldehyde, acetaldehyde, benzaldehyde, hydroxybenzaldehyde, or hydroxynaphthaldehyde.
Dependencies are inferred from the claim text.