Polyurethane foam for shoe soles

Details Polyurethane foam for shoe soles Polyurethane foam for shoe soles

2000-06-06

2001-12-11

Cooney, Jr., John M. (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

C521S134000, C521S159000, C521S170000, C521S174000

Reexamination Certificate

active

06329441

ABSTRACT:

This application is the national phase under 35 U.S.C. § 371 of PCT International Application No. PCT/JP98/05935 which has an International filing date of Dec. 24, 1998, which designated the United States of America.
TECHNICAL FIELD
The present invention relates to a polyurethane foam for shoe soles, which can be desirably used, for instance, for shoe soles for sport shoes, particularly for low-density soles.
BACKGROUND ART
Polyether polyurethane has excellent antibacterial property and excellent flexural strength at low temperatures, and particularly excellent hydrolysis resistance, as compared to polyester polyurethane. However, the polyether polyurethane has poor mechanical properties such as abrasion resistance and flexural strength at ambient temperature, and there are some defects in that peeling of a skin layer and molding shrinkage are likely to take place during foaming.
In order to improve the mechanical properties of the polyether polyurethane, there has been proposed to substitute a part or whole of the polyoxypropylene polyol used as a polyol component for polyoxytetramethylene glycol. A usual polyurethane can be practically used as soles having a high density ranging from 0.5 to 1.3 g/cm
3
, but it would be difficult to use the polyurethane as soles having a low density ranging from 0.15 to 0.5 g/cm
3
, even if the polyoxytetramethylene glycol is used.
An object of the present invention is to provide a polyurethane foam for shoe soles having excellent appearance without any peeling of a skin layer or molding shrinkage in the average density of 0.15 to 0.5 g/cm
3
, which is made of a polyether polyurethane having excellent hydrolysis resistance.
The above and other objects of the present invention will be apparent from the following description.
DISCLOSURE OF INVENTION
The present invention is directed to a polyurethane foam for shoe soles having an average density of 0.15 to 0.5 g/cm
3
, prepared by reacting polyol components comprising:
(A) a polyether-polyol A having two or more hydroxyl groups;
(B) a polymer-polyol B comprising a polyether-polyol having two or more hydroxyl groups as a base material and fine polymer particles; and
(C) a chain extender,
with a polyisocyanate compound in the presence of a blowing agent and a catalyst, wherein the amount of the fine polymer particles is 10 to 30 parts by weight, based on 100 parts by weight of the total amount of the polyether-polyol A and the polymer-polyol B.


REFERENCES:
patent: 5510054 (1996-04-01), Mussini
patent: 5840782 (1998-11-01), Limerkens et al.
patent: 2457726 (1976-06-01), None
patent: A1582385 (1994-02-01), None
patent: A1677543 (1995-10-01), None
patent: A1-9744374 (1997-11-01), None

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