Composition for manufacturing lightweight footwear having improved heat-resistance and lightweight footwear manufactured using the same
AssigneesNanotech Ceramics Co., Ltd., Korea Institute of Footwear & Leather Technology
InventorsSang Ok Jeong, Sang Young Park, Dong Hun Han, Young Min Kim, Dan Bi Lee
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Abstract
The lightweight footwear of the present invention maintains excellent durability and improves heat resistance, so that contraction percentage due to a change with the passage of time is significantly low, rarely causing deformation, and thus, the lightweight footwear may be used in a high temperature and sanitary environment. In addition, the present invention solves the problem of the occurrence of premature foaming due to injection molding and a pattern on the appearance due to dispersion failure, thereby facilitating injection molding.
Claims10
A composition for manufacturing lightweight footwear having improved heat resistance, the composition comprising:
- a thermoplastic polymer mixture including:
- a first polymer comprising at least one selected from the group consisting of an ethylene vinyl acetate copolymer, an ethylene octene copolymer, and an ethylene butene copolymer;
- and
- a second polymer having a melting point ranging from 100° C. to 140° C.;
- a filler;
- a foaming agent;
- a crosslinking agent;
- and
- a reactive additive that is configured to react with the filler to disperse the filler,
- wherein the second polymer is at least one selected from among low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and high density polyethylene (HDPE),
- wherein the filler is contained in an amount of 12 to 35 parts by weight with respect to 100 parts by weight of the thermoplastic polymer mixture and has a particle diameter less than 10 μm,
- wherein the reactive additive is contained in an amount of 3 to 12 parts by weight with respect to 100 parts by weight of the thermoplastic polymer mixture,
- wherein the reactive additive is at least one selected from the group consisting of a silane coupling agent, polyethylene glycol, polypropylene glycol, and itaconic acid,
- wherein the composition further comprising an ethylene vinyl acetate copolymer having a melting index of 15 g/10 min to 400 g/10 min to prevent the occurrence of premature foaming during footwear manufacturing using the composition for manufacturing lightweight footwear having improved heat resistance,
- wherein the ethylene vinyl acetate copolymer having the melting index of 15 g/10 min to 400 g/10 min is contained in an amount of 5 to 15 parts by weight with respect to 100 parts by weight of the thermoplastic polymer mixture, and
- wherein a weight ratio of the first polymer to the second polymer included in the thermoplastic polymer mixture is 3:7 to 6:4.
Dependencies are inferred from the claim text.