Crystalline polyester resin and flame-retardant sealing resin composition

Patent metadata

Field	Value
Publication number	US-11118007-B2
Application number	US-201716305488-A
Country	US
Kind code	B2
Filing date	Sep 11, 2017
Priority date	Sep 29, 2016
Publication date	Sep 14, 2021
Grant date	Sep 14, 2021

Abstract

The present invention aims to provide a crystalline polyester resin which satisfies both of a high melting point and a high fluidity, and a flame-retardant sealing resin composition using the same. A crystalline polyester resin (A) containing polycarboxylic acid components and polyhydric alcohol components as copolymerizing components, characterized in that a copolymerizing rate of a 2,6-naphthalenedicarboxylic acid component is from 40 to 100 molar % when a total of the polycarboxylic acid components in the crystalline polyester resin (A) is taken as 100 molar %, that a 1,4-butanediol component is copolymerized as a polyhydric alcohol component, and that a copolymerizing rate of the 1,4-butanediol component is 40 molar % or less when a total of the polyhydric alcohol components is taken as 100 molar %.

First claim

The invention claimed is:

1. A crystalline polyester resin (A) containing polycarboxylic acid components and polyhydric alcohol components as copolymerizing components,
wherein a copolymerizing rate of a 2,6-naphthalenedicarboxylic acid component is from 40 to 100 molar % when a total of the polycarboxylic acid components in the crystalline polyester resin (A) is taken as 100 molar %,
wherein a 1,4-butanediol component is copolymerized as a polyhydric alcohol component,
wherein a copolymerizing rate of the 1,4-butanediol component is 40 molar % or less when a total of the polyhydric alcohol components is taken as 100 molar %, and
wherein a melting point of the crystal is from 100° C. to 180° C.

2. The crystalline polyester resin (A) according to claim 1 , wherein a copolymerizing rate of a 1,4-cyclohexanedimethanol component is 60 molar % or more when the total of the polyhydric alcohol components in the crystalline polyester resin (A) is taken as 100 molar %.

3. The crystalline polyester resin (A) according to claim 1 , wherein a number-average molecular weight is from 5,000 to 50,000.

4. A flame-retardant sealing resin composition containing the crystalline polyester resin (A) according to claim 1 and a flame retardant agent (B).

5. The flame-retardant sealing resin composition according to claim 4 , wherein the flame retardant agent (B) is an ester of phosphoric acid or a metal salt of phosphinic acid.

6. The flame-retardant sealing resin composition according to claim 4 , wherein a ratio W(A)/W(B) which is a ratio of a weight fraction W(A) of the crystalline polyester resin (A) to a weight fraction W(B) of the flame retardant agent (B) is from 3 to 20.

7. The flame-retardant sealing resin composition according to claim 4 , wherein a sum of the weight fraction W(A) of the crystalline polyester resin (A) and the weight fraction W(B) of the flame retardant agent (B) to a total weight of the flame-retardant sealing resin composition is from 50 to 90% by weight.

Assignees

• Toyo Boseki

Inventors

• Murakami Yuki
• Hamasaki Ryo

Classifications

• C08G63/672

  Dicarboxylic acids and dihydroxy compounds · CPC title

• C08G63/199

  Acids or hydroxy compounds containing cycloaliphatic rings · CPC title

• C09J167/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds (C09J167/06 takes precedence) · CPC title

• C08G63/553

  Acids or hydroxy compounds containing cycloaliphatic rings, e.g. Diels-Alder adducts · CPC title

• C08K5/5313

  Phosphinic compounds, e.g. R2=P(:O)OR' · CPC title