US3961124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shoe-stiffener material of latex saturated flexible fabric
Assignee: Individual
•
Filing: 1974-11-04
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Granted: 1976-06-01
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Expires: 1994-11-04
Abstract
Abstract A shoe-stiffening material useful as a stock material to stiffen selected parts of a shoe, which material comprises: a flexible fabric material saturated with a latex composition comprising a natural or synthetic elastomeric polymer, such as styrene-butadiene rubber, and a cross-linking system comprising a peroxide agent, a vinyl polymeric activator and a metal oxide catalyst, which system is adapted to effect cross-linking of the polymer at a temperature and in a time period employed in the shoe-manufacturing process, the sheet material optionally coated on one or both sides with an adhesive thermoplastic polymer, whereby the flexible sheet material may be employed between an outer leather and an inner shoe liner, and forms a bonded, stiff stock material as a box toe stiffener or shoe counter.
Inventors
- 👤 George Matton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:35
CPC Classifications
C; C08; C08L; C08L21/00; C09; C09J; C09J7/00; C09J7/20; C09J7/205; C09J7/21; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31801; Y10T428/31804; Y10T428/31855; Y10T428/31909; Y10T428/31928; Y10T428/31931; Y10T442/00; Y10T442/20; Y10T442/2361
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
178 words
A shoe-stiffening material which comprises an absorbent fibrous flexible sheet material impregnated with: a. a natural or synthetic elastomer subject to cross-linking to a thermosetting condition by a peroxide cross-linking agent; b. a cross-linking amount of a peroxide-curing system which comprises i. a peroxide cross-linking agent having an activation temperature of above 150°C, and which has no toxic residue products on activation, ii. a metal oxide selected from the group consisting of sodium oxide, potassium oxide, barium oxide, calcium oxide and magnesium oxide in an amount of from 0.01 to 1.0 phr to lower the activation temperature of the peroxide to below 150°C and more than 70°C, and iii. a thermoplastic vinyl polymer is an amount of from 0.001 to 0.1 phr to promote the efficiency of the peroxide on activation; and c. the material being soft, limp, ductile and flexible, but which material is converted on heating to a stiff and resilient material in a shoe mold having a temperature of from about 135° to 150°C for a period of time for about 5 to 30 seconds.
Claim 2
Dependent Claim
178 words
A shoe-stiffening material which comprises an absorbent fibrous flexible sheet material impregnated with: a. a natural or synthetic elastomer subject to cross-linking to a thermosetting condition by a peroxide cross-linking agent; b. a cross-linking amount of a peroxide-curing system which comprises i. a peroxide cross-linking agent having an activation temperature of above 150°C, and which has no toxic residue products on activation, ii. a metal oxide selected from the group consisting of sodium oxide, potassium oxide, barium oxide, calcium oxide and magnesium oxide in an amount of from 0.01 to 1.0 phr to lower the activation temperature of the peroxide to below 150°C and more than 70°C, and iii. a thermoplastic vinyl polymer is an amount of from 0.001 to 0.1 phr to promote the efficiency of the peroxide on activation; and c. the material being soft, limp, ductile and flexible, but which material is converted on heating to a stiff and resilient material in a shoe mold having a temperature of from about 135° to 150°C for a period of time for about 5 to 30 seconds.
Claim 3
Dependent Claim
12 words
The material of claim 1 wherein the elastomer is a butadiene-styrene copolymer.
Claim 4
Dependent Claim
11 words
The material of claim 1 wherein the peroxide is dicumyl peroxide.
Claim 5
Dependent Claim
16 words
The material of claim 1 wherein the vinyl polymer is polyvinyl acetate or ethylene vinyl acetate.
Claim 6
Dependent Claim
30 words
The material of claim 1 wherein the elastomer is a butadiene-styrene copolymer, the peroxide is dicumyl peroxide, the metal oxide is calcium oxide, and the vinyl polymer is polyvinyl acetate.
Claim 7
Dependent Claim
13 words
The material of claim 1 wherein the sheet is a woven cotton sheet.
Claim 8
Dependent Claim
20 words
The material of claim 1 wherein the sheet contains from about 10 to 20 ounces per yard of the elastomer.
Claim 9
Dependent Claim
30 words
The material of claim 1 wherein the sheet includes a layer of 2 to 20 mils of a thermoplastic adhesive layer on one or both surfaces of the sheet material.
Claim 10
Dependent Claim
26 words
The material of claim 1 wherein the cross-linking agent is present in an amount of from about 0.5 to 10 parts per 100 parts of elastomer.
Claim 11
Dependent Claim
19 words
The material of claim wherein the material has a moisture level of from about 2 to 8% by weight.
Claim 12
Dependent Claim
33 words
The material of claim 1 which contains an adhesive layer on one or both surfaces thereof, the adhesive layer comprising a thermoplastic vinyl acetate resin, a hydrocarbon resin and wax or combinations thereof.
Claim 13
Dependent Claim
170 words
A shoe-stiffening material which comprises: a. an absorbent woven cotton sheet material having a moisture level of less than about 10% and impregnated with an amount of from about 20 to 50% by weight of a styrene butadiene peroxide cross-linkable elastomer which contains a cross-linking amount of a peroxide-curing system which comprises: i. from about 0.5 to 10 parts per hundred parts of elastomer of dicumyl peroxide, ii. from about 0.01 to 1.0 phr of calcium oxide, and iii. from about 0.01 to 0.1 phr of polyvinyl acetate or ethylene vinyl acetate, b. the cotton sheet material having on one or both surfaces a thermoplastic adhesive layer which comprises polyvinyl acetate, ethylene vinyl acetate, hydrocarbon resin and wax or combinations thereof; and c. the material being soft, limp, ductile and flexible, but which material is converted on heating to a stiff and resilient material when heated in a shoe mold having a temperature of from about 135° to 150°C for a period of time for about 5 to 30 seconds.
Claim 14
Dependent Claim
170 words
A shoe-stiffening material which comprises: a. an absorbent woven cotton sheet material having a moisture level of less than about 10% and impregnated with an amount of from about 20 to 50% by weight of a styrene butadiene peroxide cross-linkable elastomer which contains a cross-linking amount of a peroxide-curing system which comprises: i. from about 0.5 to 10 parts per hundred parts of elastomer of dicumyl peroxide, ii. from about 0.01 to 1.0 phr of calcium oxide, and iii. from about 0.01 to 0.1 phr of polyvinyl acetate or ethylene vinyl acetate, b. the cotton sheet material having on one or both surfaces a thermoplastic adhesive layer which comprises polyvinyl acetate, ethylene vinyl acetate, hydrocarbon resin and wax or combinations thereof; and c. the material being soft, limp, ductile and flexible, but which material is converted on heating to a stiff and resilient material when heated in a shoe mold having a temperature of from about 135° to 150°C for a period of time for about 5 to 30 seconds.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |