Compound for flex sole
AssigneeBBC International, Ltd.
InventorHomar Hernandez
Life of this patent
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Abstract
The present invention discloses a compound and a method for a cushion pad that is bonded to an outsole without the need for glue or other adhesives. This cushion pad can be softer and more flexible then the outsole but can be similar enough in composition to be recyclable without having to separate it from the outsole. The compound can consist of a styrene-butadiene-styrene triblock copolymer, ethyl-vinyl-acetate, peroxide, a filler agent, and a blowing agent. The combination of these materials will form a high rubber content foam sheet that is very soft and shock adsorbing. This process can use the above compound to manufacture a rubber outsole with an integrated cushioning pad that can be manufactured in one step.
Claims35
A shoe sole comprised of a cushion pad and an outsole;
- said cushion pad composition consists of:
- a styrene-butadiene-styrene triblock copolymer in the range of about 50 to about 100 parts per hundred parts of rubber (“phr”);
- an ethyl vinyl acetate in the range of about 0 to about 50 phr;
- a curing agent in the range of about 0.5 to about 1.0 phr;
- a filler agent in the range of about 0 to about 10 phr;
- a blowing agent in the range of about 3 to about 5 phr.
A method of manufacturing a shoe sole comprising the steps:
- (a) forming the compound for the cushion pad by mixing a styrene-butadiene-styrene triblock copolymer, ethyl vinyl acetate, a curing agent, a filler agent, and a blowing agent in a kneader;
- (b) kneading said cushion pad compound;
- (c) rolling said cushion pad compound into a sheet approximating 2.5 millimeters in thickness;
- (d) heating a cushion pad mold to a range of temperatures of about 160° Centigrade to about 180° Centigrade;
- (e) clamping said cushion pad mold;
- (f) injecting said cushion pad compound into the said heated cushion pad mold;
- (g) raising the pressure in the cushion pad mold from about 140 kg/cm2 to about 160 kg/cm2;
- (h) curing said cushion pad compound in said cushion pad mold;
- (i) removing a cured cushion pad;
- (j) forming a compound for said outsole by mixing a dry styrene-butadiene-styrene triblock copolymer, ethyl vinyl acetate, a curing agent, a filler agent, a blowing agent and a processing oil;
- (k) placing said cushion pad in the outsole mold;
- (l) changing said outside mold;
- (m) injecting said outsole compound into the outsole mold;
- (n) curing said outsole/cushion pad combination;
- and
- (o) removing said outsole/cushion pad combination.
A shoe comprising:
- an upper;
- and
- an outsole affixed to said upper, said outsole having cushion pad therein;
- said cushion pad composition consisting of:
- a styrene-butadiene-styrene triblock copolymer in the range of about 50 to about 100 parts per hundred parts of rubber (“phr”);
- an ethyl vinyl acetate in the range of about 0 to about 50 phr;
- a curing agent in the range of about 0.5 to about 1.0 phr;
- a filler agent in the range of about 0 to about 10 phr;
- and
- a blowing agent in the range of about 3 to about 5 phr.
A method of manufacturing a shoe comprising the steps:
- (a) forming the compound for the cushion pad by mixing a styrene-butadiene-styrene triblock copolymer, ethyl vinyl acetate, a curing agent, a filler agent, and a blowing agent in a kneader;
- (b) kneading said cushion pad compound;
- (c) rolling said cushion pad compound into a sheet approximating 2.5 millimeters in thickness;
- (d) heating a cushion pad mold to a range of temperatures from about 160° Centigrade to about 180° Centigrade;
- (e) clamping said cushion pad mold;
- (f) injecting said cushion pad compound into the said heated cushion pad mold;
- (g) raising the pressure in the cushion pad mold from about 140 kg/cm2 to about 160 kg/cm2;
- (h) curing said cushion pad compound in said cushion pad mold;
- (i) removing a cured cushion pad;
- (j) forming a compound for said outsole by mixing a dry styrene-butadiene-styrene triblock copolymer, ethyl vinyl acetate, a curing agent, a filler agent, a blowing agent and a processing oil;
- (k) placing said cushion pad in the outsole mold;
- (l) changing said outside mold;
- (m) injecting said outsole compound into the outsole mold;
- (n) curing said outsole/cushion pad combination;
- and
- (o) removing said outsole/cushion pad combination.
Dependencies are inferred from the claim text.