IP Library › Granted Patent US 12703776
Granted Patent B2
US 12703776 · App. 18/281,897 · Granted Aug 11, 2026

Foamed particles of aromatic polyester resin, production method therefor, molded foam, and member for vehicle

Inventor: Yusuke Kuwabara (Osaka, JP)
Assignee: SEKISUI KASEI CO., LTD.
C08J9/228B29B9/065B29C48/0012B29C48/0022B29C48/022B29C48/397B29C48/919C08J9/141C08J9/18B29K2067/003C08J2201/03C08J2203/14C08J2367/02
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Quick Facts
Patent No.
US 12703776
App. No.
18/281,897
Granted
Aug 11, 2026
Kind
B2
Abstract

An object of the present invention is to provide an aromatic polyester-based resin foam molded product having excellent mechanical properties, foamed aromatic polyester-based resin particles for producing the foam molded product, or a method for producing the foamed particles. The present invention relates to foamed aromatic polyester-based resin particles, wherein crystallinity (A) in a particle central portion and crystallinity (B) in a particle surface layer are both 10% or less, and a ratio of the crystallinity in the surface layer to the crystallinity in the central portion (B/A) is 0.3 to 1.4.

Claims (8)

1 . Foamed aromatic polyester-based resin particles, wherein crystallinity (A) in a particle central portion and crystallinity (B) in a particle surface layer are both 10% or less, and a ratio of the crystallinity in the surface layer to the crystallinity in the central portion (B/A) is 0.30 to 1.40.

2 . The foamed aromatic polyester-based resin particles according to claim 1 , wherein a resin layer of the particle surface has a thickness of 5 μm to 40 μm.

3 . The foamed aromatic polyester-based resin particles according to claim 1 , wherein an average cell diameter (C) in the particle central portion and an average cell diameter (D) in the particle surface layer are both 50 μm to 300 μm, and a ratio of the average cell diameter in the surface layer to the average cell diameter in the central portion (D/C) is 0.75 to 0.95.

4 . The foamed aromatic polyester-based resin particles according to claim 1 , wherein the ratio of the crystallinity in the surface layer to the crystallinity in the particle central portion (B/A) is 0.30 to 1.30.

5 . The foamed aromatic polyester-based resin particles according to claim 1 , wherein the crystallinity (A) in the particle central portion and the crystallinity (B) in the particle surface layer are both 1 to 10%.

6 . A foam molded product of the foamed aromatic polyester-based resin particles according to claim 1 .

7 . The foam molded product according to claim 6 , which has a density of 0.05 g/cm 3 to 0.7 g/cm 3 .

8 . An automobile component comprising the foam molded product according to claim 6 .