US4151661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shoe soles and method for manufacturing the same
Assignee: Nihon Soflan Chemical and Engineering Co Ltd
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Filing: 1977-09-19
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Granted: 1979-05-01
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Expires: 1997-09-19
Abstract
Abstract A method of manufacturing non-yellowing polyurethane shoe soles which comprises coating a non-yellowing polyurethane composition on the inner surface of a mould for shaping soles, subsequently casting a foamable polyurethane composition into the mould, and curing the compositions, whereby a non-yellowing polyurethane outer layer and a foamed polyurethane sole base are formed and integrally united together to give the shoe sole; and non-yellowing shoe soles thus obtained.
Inventors
- 👤 Junji Namba
- 👤 Shizuo Kageyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:26
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29C44/14; A; A43; A43B; A43B13/00; A43B13/02; A43B13/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
127 words
A non-yellowing polyurethane shoe sole, comprising; a non-yellowing polyurethane outer layer forming the lower surface of the shoe sole and a foamed polyurethane sole base integrally united by curing to said outer layer, said sole base having been made by casting directly onto the upper surface of a preformed outer layer a foamable liquid mixture consisting essentially of an isocyanate-terminated prepolymer liquid and a resin liquid containing polyurethane-forming hydroxyl material, a catalyst and a foaming agent, and reacting the ingredients of said mixture to cause same to foam into the shape of said sole base and to cure the foamed polyurethane into a solid state while in contact with said preformed outer layer whereby said foamed sole base is integrally united by curing to said outer layer.
Claim 2
Dependent Claim
127 words
A non-yellowing polyurethane shoe sole, comprising; a non-yellowing polyurethane outer layer forming the lower surface of the shoe sole and a foamed polyurethane sole base integrally united by curing to said outer layer, said sole base having been made by casting directly onto the upper surface of a preformed outer layer a foamable liquid mixture consisting essentially of an isocyanate-terminated prepolymer liquid and a resin liquid containing polyurethane-forming hydroxyl material, a catalyst and a foaming agent, and reacting the ingredients of said mixture to cause same to foam into the shape of said sole base and to cure the foamed polyurethane into a solid state while in contact with said preformed outer layer whereby said foamed sole base is integrally united by curing to said outer layer.
Claim 3
Dependent Claim
43 words
A shoe having a non-yellowing polyurethane shoe sole as claimed in claim 1, in which a shoe last having a shoe upper mounted thereon is integrally united to said foam sole base by curing said foamed polyurethane while in contact with said last.
Claim 4
Dependent Claim
70 words
A shoe sole according to claim 1 wherein said non-yellowing polyurethane composition is obtained by the reaction of (a) a polyhydroxy compound having a molecular weight of 500 to 3,000 and a low molecular hydroxy compound, with (b) a non-yellowing diisocyanate selected from the group consisting of hexamethylene diisocyanate, metaxylene diisocyanate, hydrogenated diphenylmethane diisocyanate, hydrogenated tolylene diisocyanate and isophorone diisocyanate, in a ratio of (a):(b) of about 1:1 by equivalent.
Claim 5
Dependent Claim
45 words
A shoe sole according to claim 1 wherein said non-yellowing polyurethane composition is a two-component system and said foamable polyurethane composition is cast into the mould while the non-yellowing polyurethane layer is tacky in the mould or after the non-yellowing polyurethane layer has been cured.
Claim 6
Dependent Claim
37 words
A shoe sole according to claim 1 wherein said non-yellowing polyurethane composition is a solvent composition and said foamable polyurethane composition is cast into the mould after the solvent of the non-yellowing polyurethane layer has been evaporated.
Claim 7
Dependent Claim
43 words
A non-yellowing shoe sole according to claim 1, wherein the cross section of the shoe sole has an interface between the foamed polyurethane sole base and the non-yellowing polyurethane outer layer which can be discriminated by a discoloring test using ultraviolet ray irradiation.
References Cited (Backward Citations)
US3596381A
Cited
US4020569A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-30 | 1982-10-30 | 1983-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-30 | 1986-10-30 | 1987-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-30 | 1990-10-30 | 1991-05-01 | $7700.00 | Window Closed / Lapsed |