Shock absorbing insole construction
First Claim
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1. An insole construction comprising an upper layer of plastic material having a storage modulus of between about 500 and 2,000 psi/cycle and a lower layer of viscoelastic polyurethane material having a storage modulus of between about 10 and 85 psi/cycle and a specific gravity of between about 0.95 and 1.10.
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Abstract
A shock absorbing insole construction including an upper layer of plastic material having a storage modulus which is about 100 times the storage modulus of a lower layer of material and both materials having a relatively high loss factor. In its more particular aspects, the upper layer is a poly(ethylene-vinyl acetate) and the lower layer is a viscoelastic polyurethane polymer.
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15 Claims
- 1. An insole construction comprising an upper layer of plastic material having a storage modulus of between about 500 and 2,000 psi/cycle and a lower layer of viscoelastic polyurethane material having a storage modulus of between about 10 and 85 psi/cycle and a specific gravity of between about 0.95 and 1.10.
- 11. An insole construction comprising a lower layer of viscoelastic polyurethane polymer having a specific gravity of between about 0.95 and 1.10 and an upper layer of microporous poly(ethylene-vinyl acetate).
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14. A pad for installation as the insole of a shoe comprising an upper layer of plastic material having a storage modulus of between about 500 and 2,000 psi/cycle and a lower layer of viscoelastic polyurethane material having a storage modulus of between about 10 and 85 psi/cycle and a specific gravity of between about 0.95 and 1.10.
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15. An insole construction comprising a lower layer of viscoelastic polyurethane having a specific gravity of between about 0.95 and 1.10 and an upper layer selected from the group of microporous poly(ethylene-vinyl acetate) and foamed semirigid polyurethane and foamed polypropylene and foamed polyethylene.
Specification