Molded foam article, foamed sole, and shoe

Patent metadata

Field	Value
Publication number	US-10113045-B2
Application number	US-201214404407-A
Country	US
Kind code	B2
Filing date	May 31, 2012
Priority date	May 31, 2012
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

There is provided a molded foam article including a foam obtained by foaming a formation material wherein the formation material contains a resin component, an Asker C hardness of the foam is 10 degrees or more, and a ratio E40/E0 of the foam is 0.5 or more, the ratio E40/E0 being a ratio of an elastic coefficient E40 at a strain of 40% in relation to an elastic coefficient E0 at a strain of 0% of the foam.
The molded foam article has appropriate softness with a small change in hardness under compressive deformation.

First claim

What is claimed is:

1. A molded foam article comprising:
a foam obtained by foaming a formation material, wherein the formation material of the foam comprises (i) at least one resin component selected from a thermoplastic elastomer, a thermoplastic resin, and a rubber, and (ii) at least one softener selected from a vegetable oil and a mineral oil,
wherein an Asker C hardness of the foam is 10 degrees or more,
wherein the at least one resin component and the at least one softener are selected such that a ratio E40/E0 of the foam is (i) equal to or more than 0.5 and (ii) equal to or less than 3.5, the ratio E40/E0 being a ratio of an elastic coefficient E40 at a compressive strain of 40% in relation to an elastic coefficient E0 at a compressive strain of 0% of the foam, and
wherein a difference between (i) H1 as an Asker C hardness when a load of 0.1 MPa is applied and (ii) H0 as an Asker C hardness in a no load state, is within a range of ±20 degrees.

2. The molded foam article according to claim 1 , wherein the Asker C hardness of the foam is 60 degrees or less.

3. The molded foam article according to claim 1 , wherein a storage modulus of the formation material is 15 MPa or less at a frequency of 10 Hz at 23° C.

4. The molded foam article according to claim 1 , wherein the foam has a specific gravity of 0.7 or less.

5. A foamed sole having the molded foam article as defined in claim 1 .

6. A shoe having the foamed sole as defined in claim 5 .

7. The molded foam article according to claim 1 , wherein the thermoplastic elastomer includes a styrene-based elastomer.

8. The molded foam article according to claim 1 , wherein the thermoplastic resin includes a vinyl acetate-based resin.

9. The molded foam article according to claim 1 , wherein the resin component comprises rubber.

Assignees

• Tateishi Junichiro
• Harano Kenichi
• Yamada Keisuke
• Nasako Mitsuo
• Asics Corp

Inventors

• Tateishi Junichiro
• Harano Kenichi
• Yamada Keisuke
• Nasako Mitsuo

Classifications

• C08J2331/04

  Homopolymers or copolymers of vinyl acetate · CPC title

• A43B13/187

  Resiliency achieved by the features of the material, e.g. foam, non liquid materials · CPC title

• C08J2353/02

  of vinyl aromatic monomers and conjugated dienes · CPC title

• C08J2203/04

  N2 releasing, ex azodicarbonamide or nitroso compound · CPC title

• C08J2300/22

  Thermoplastic resins · CPC title