Method for producing dihydroxynaphthalene condensate and dihydroxynaphthalene condensate

Patent metadata

Field	Value
Publication number	US-11267937-B2
Application number	US-201816225275-A
Country	US
Kind code	B2
Filing date	Dec 19, 2018
Priority date	Dec 26, 2017
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

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.

First claim

The invention claimed is:

1. A method for producing a dihydroxynaphthalene condensate, the method comprising:
treating a dihydroxynaphthalene with neutral alumina particles having a particle size distribution in which 80% or more of the neutral alumina particles have a size in a range of from 63 μm to 250 μm, and less than 10% of the neutral alumina particles have a size of less than 63 μm, wherein the treated dihydroxynaphthalene has a sulfur element content of 100 ppm or less in terms of mass among constituent elements, and
condensing the treated dihydroxynaphthalene and a condensation agent in presence of an acid or a base to produce the dihydroxynaphthalene condensate.

2. The method for producing a dihydroxynaphthalene condensate according to claim 1 , wherein the condensation agent is used in an amount of 0.01 to 5.0 moles relative to 1 mole of the dihydroxynaphthalene.

3. The method for producing a dihydroxynaphthalene condensate according to claim 1 , wherein the dihydroxynaphthalene is 1,5-dihydroxynaphthalene or 2,7-dihydroxynaphthalene.

4. The method for producing a dihydroxynaphthalene condensate according to claim 2 , wherein the dihydroxynaphthalene is 1,5-dihydroxynaphthalene or 2,7-dihydroxynaphthalene.

5. The method for producing a dihydroxynaphthalene condensate according to claim 1 , wherein the treated dihydroxynaphthalene has a sulfur element content of 50 ppm or less in terms of mass among the constituent elements.

6. The method for producing a dihydroxynaphthalene condensate according to claim 2 , wherein the treated dihydroxynaphthalene has a sulfur element content of 50 ppm or less in terms of mass among the constituent elements.

7. The method for producing a dihydroxynaphthalene condensate according to claim 3 , wherein the treated dihydroxynaphthalene has a sulfur element content of 50 ppm or less in terms of mass among the constituent elements.

8. The method for producing a dihydroxynaphthalene condensate according to claim 4 , wherein the treated dihydroxynaphthalene has a sulfur element content of 50 ppm or less in terms of mass among the constituent elements.

9. The method for producing a dihydroxynaphthalene condensate according to claim 1 , wherein the condensation agent is formaldehyde, paraformaldehyde, acetaldehyde, benzaldehyde, hydroxybenzaldehyde, or hydroxynaphthaldehyde.

10. The method for producing a dihydroxynaphthalene condensate according to claim 2 , wherein the condensation agent is formaldehyde, paraformaldehyde, acetaldehyde, benzaldehyde, hydroxybenzaldehyde, or hydroxynaphthaldehyde.

11. The method for producing a dihydroxynaphthalene condensate according to claim 3 , wherein the condensation agent is formaldehyde, paraformaldehyde, acetaldehyde, benzaldehyde, hydroxybenzaldehyde, or hydroxynaphthaldehyde.

12. The method for producing a dihydroxynaphthalene condensate according to claim 4 , wherein the condensation agent is formaldehyde, paraformaldehyde, acetaldehyde, benzaldehyde, hydroxybenzaldehyde, or hydroxynaphthaldehyde.

13. A dihydroxynaphthalene condensate, produced by the method according to claim 1 , wherein a sulfur element content among constituent elements contained in the dihydroxynaphthalene condensate is 100 ppm or less in terms of mass.

14. The dihydroxynaphthalene condensate according to claim 13 , wherein the dihydroxynaphthalene condensate has a weight average molecular weight of 500 to 500,000.

15. The dihydroxynaphthalene condensate according to claim 13 , wherein the dihydroxynaphthalene is 1,5-dihydroxynaphthalene or 2,7-dihydroxynaphthalene.

16. The dihydroxynaphthalene condensate according to claim 14 , wherein the dihydroxynaphthalene is 1,5-dihydroxynaphthalene or 2,7-dihydroxynaphthalene.

17. The dihydroxynaphthalene condensate according to claim 13 , wherein the condensation agent is formaldehyde, paraformaldehyde, acetaldehyde, benzaldehyde, hydroxybenzaldehyde, or hydroxynaphthaldehyde.

18. The dihydroxynaphthalene condensate according to claim 14 , wherein the condensation agent is formaldehyde, paraformaldehyde, acetaldehyde, benzaldehyde, hydroxybenzaldehyde, or hydroxynaphthaldehyde.

19. The dihydroxynaphthalene condensate according to claim 15 , wherein the condensation agent is formaldehyde, paraformaldehyde, acetaldehyde, benzaldehyde, hydroxybenzaldehyde, or hydroxynaphthaldehyde.

20. The dihydroxynaphthalene condensate according to claim 16 , wherein the condensation agent is formaldehyde, paraformaldehyde, acetaldehyde, benzaldehyde, hydroxybenzaldehyde, or hydroxynaphthaldehyde.

Assignees

• Shinetsu Chemical Co

Inventors

• Kori Daisuke
• Tachibana Seiichiro
• Ogihara Tsutomu
• Kitano Satoru
• Abe Yukio
• Hatakeyama Fumihiro
• Kobayashi Taiki

Classifications

• C08G10/04 Primary

  Chemically-modified polycondensates · CPC title

• C08G65/34 Primary

  from hydroxy compounds or their metallic derivatives {(C08G65/26 takes precedence)} · CPC title

• B01J20/08

  comprising aluminium oxide or hydroxide; comprising bauxite · CPC title

• C08L61/06

  of aldehydes with phenols · CPC title

• B01D15/08 Primary

  Selective adsorption, e.g. chromatography · CPC title