Shoe having a midsole of polyurethane and a walking sole of...

Details Shoe having a midsole of polyurethane and a walking sole of... Shoe having a midsole of polyurethane and a walking sole of...

A - Human Necessities

43

B

18/82, 36/84

A43B 13/02 (2006.01) B29D 35/08 (2010.01) A43B 13/12 (2006.01)

Patent

CA 1270613

ABSTRACT A shoe has an injection-moulded midsole of polyurethane and an injection-moulded walking sole of elastomer. The midsole and walking sole are connected by chemical bonds between the isocyanate and reactive terminal groups of substances added to the elastomer. In order to make the shoe, a catalyst is added to the polyol and isocyanate mixture which reacts to form polyurethane to influence the speed of reaction and substances having reactive terminal groups are added to the elastomer. The walking sole is formed and the mixture for the midsole is introduced into a space between the walking sole and an upper. The reaction speed of the mixture and the temperature of the elastomer are controlled so that the chemical bonds are formed. An apparatus for making the shoe has separate appliances for moulding the walking sole and the midsole.

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