Foamable composition

Patent metadata

Field	Value
Publication number	US-9416242-B2
Application number	US-201314407171-A
Country	US
Kind code	B2
Filing date	Sep 27, 2013
Priority date	Sep 28, 2012
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

The foamable composition according to the present invention comprises a copolymer of ethylene, an α-olefin and a non-conjugated diene, a blowing agent, a crosslinking agent, a catalyst and a reaction suppressor, wherein in the foamable composition, the storage elastic modulus at 23° C. as measured by a viscoelasticity measuring apparatus is 2×10 4 Pa or lower, and the storage elastic modulus after the foamable composition is held at 115° C. for 200 seconds is 5×10 4 Pa or higher; thereby, a foam body having a low expansion ratio, a low compression strength and a high cushioning property can be produced.

First claim

The invention claimed is:

1. A foamable composition, comprising: a copolymer of ethylene, an α-olefin and a non-conjugated diene; a blowing agent; a crosslinking agent; a catalyst; and a reaction suppressor,
wherein the foamable composition has a storage elastic modulus at 23° C. as measured by a viscoelasticity measuring apparatus of 2×10 4 Pa or lower, and a storage elastic modulus after the foamable composition is held at 115° C. for 200 seconds of 5×10 4 Pa or higher,
wherein the foamable composition comprises an organic solvent being liquid at 23° C. as the blowing agent, and
wherein the blowing agent is an organic solvent having a relative evaporation rate of 0.5 to 3.7 in the case where the evaporation rate of n-butyl acetate at 25° C. is taken to be 1.0.

2. The foamable composition according to claim 1 , wherein the crosslinking agent is a crosslinking agent having at least 2 SiH groups per molecule thereof.

3. The foamable composition according to claim 1 , wherein the foamable composition comprises, relative to 100 parts by mass of the copolymer, 3 to 25 parts by mass of the crosslinking agent, 0.01 to 3.0 parts by mass of the catalyst, and 0.01 to 5.0 parts by mass of the reaction suppressor.

4. A foam body, being formed by blowing and crosslinking, at a temperature of 100 to 200° C., a foamable composition comprising a copolymer of ethylene, an α-olefin and a non-conjugated diene, a blowing agent, a crosslinking agent, a catalyst and a reaction suppressor, wherein the foamable composition has a storage elastic modulus at 23° C. as measured by a viscoelasticity measuring apparatus of 2×10 4 Pa or lower, and a storage elastic modulus after the foamable composition is held at 115° C. for 200 seconds of 5×10 4 Pa or higher,
wherein the foamable composition comprises an organic solvent being liquid at 23° C. as the blowing agent, and
wherein the blowing agent is an organic solvent having a relative evaporation rate of 0.5 to 3.7 in the case where the evaporation rate of n-butyl acetate at 25° C. is taken to be 1.0.

5. The foam body according to claim 4 , wherein the foam body contains foam having an average foam cell diameter of 10 μm to 250 μm.

6. The foam body according to claim 4 , wherein the foam body has thickness of 0.07 mm to 0.5 mm.

Assignees

• Sekisui Chemical Co Ltd

Inventors

• Yahara Kazuyuki
• Toei Yozo
• Tanikawa Yuji
• Hamada Masahiro
• Dohi Akihito

Classifications

• C08J9/142 Primary

  Compounds containing oxygen but no halogen atom · CPC title

• C08J2203/12

  Organic compounds only containing carbon, hydrogen and oxygen atoms, e.g. ketone or alcohol · CPC title

• C08L23/16

  Ethylene-propylene or ethylene-propylene-diene copolymers · CPC title

• C08J2203/14

  Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons · CPC title

• C08J2201/026

  Crosslinking before of after foaming · CPC title