Crosslinked expanded beads and molded expanded-bead object

Patent metadata

Field	Value
Publication number	US-10435530-B2
Application number	US-201615572873-A
Country	US
Kind code	B2
Filing date	Mar 28, 2016
Priority date	May 14, 2015
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

An object of the present invention is to provide expanded beads capable of producing an expanded beads molded article that is excellent in in-mold moldability and is excellent with good balance in lightweight property, flexibility, repulsion, restorability, and tensile characteristics, and an expanded beads molded article using the expanded beads. The expanded beads molded article of the present invention is produced by subjecting the crosslinked expanded beads of the present invention, to in-mold molding. The expanded beads molded article of the present invention may have an apparent density of from 40 to 150 g/L.

First claim

The invention claimed is:

1. Crosslinked expanded beads produced by crosslinking and expanding particles comprising a multi-block copolymer comprising a polyethylene block and an ethylene-α-olefin copolymer block, the multi-block copolymer having a melt flow rate of from 2 to 10 g/10 min at 190° C. and a load of 2.16 kg, a Shore A hardness of from 65 to 90 measured according to ASTM D2240, and a flexural modulus of from 10 to 30 MPa, the crosslinked expanded beads having a gel fraction of from 30 to 60% by a hot xylene extraction method, an apparent density of from 50 to 280 g/L, and an average particle diameter of from 0.5 to 10 mm.

2. An expanded beads molded article produced by subjecting the crosslinked expanded beads according to claim 1 , to in-mold molding, having a tensile breaking elongation of 100% or more.

3. The expanded beads molded article according to claim 2 , wherein the molded article has an apparent density of from 40 to 150 g/L.

Assignees

• Jsp Corp

Inventors

• Takagi Shota
• Oikawa Masaharu

Classifications

• C08J2205/06

  Flexible foams · CPC title

• C08J2207/00

  Foams characterised by their intended use · CPC title

• C08J9/224

  Surface treatment · CPC title

• C08J2353/00

  Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers · CPC title

• C08J9/122

  Hydrogen, oxygen, CO2, nitrogen or noble gases · CPC title