CN104684432A - Foam for footwear midsole and the like - Google Patents

Foam for footwear midsole and the like Download PDF

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Publication number
CN104684432A
CN104684432A CN201380033063.0A CN201380033063A CN104684432A CN 104684432 A CN104684432 A CN 104684432A CN 201380033063 A CN201380033063 A CN 201380033063A CN 104684432 A CN104684432 A CN 104684432A
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CN
China
Prior art keywords
eva
foam
performance foam
performance
block copolymers
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Pending
Application number
CN201380033063.0A
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Chinese (zh)
Inventor
J·F·斯威加特
韦毅江
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Columbia Sportswear North America Inc
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Columbia Sportswear North America Inc
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Publication of CN104684432A publication Critical patent/CN104684432A/en
Pending legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B13/00—Soles; Sole-and-heel integral units
    • A43B13/02—Soles; Sole-and-heel integral units characterised by the material
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B13/00—Soles; Sole-and-heel integral units
    • A43B13/02—Soles; Sole-and-heel integral units characterised by the material
    • A43B13/04—Plastics, rubber or vulcanised fibre
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B13/00—Soles; Sole-and-heel integral units
    • A43B13/02—Soles; Sole-and-heel integral units characterised by the material
    • A43B13/12—Soles with several layers of different materials
    • A43B13/125—Soles with several layers of different materials characterised by the midsole or middle layer
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/08—Copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2400/00—Characterised by the use of unspecified polymers
    • C08J2400/26—Elastomers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2453/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2453/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
    • C08J2453/02—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers of vinyl aromatic monomers and conjugated dienes

Abstract

Embodiments herein provide high performance foam formulations and processing methods that address issues with traditional ethylene vinyl acetate (EVA) foams. In various embodiments, when used in midsoles, the high performance foam formulations may provide superior impact energy absorption per given load during compression, improved energy recovery during expansion, and reduced compression set over repeated impact cycles. In various embodiments, the high performance foam formulations may include a mixture of no more than about 75 PHR EVA foam and at least 15 PHR polyolefin foam.

Description

For the foam of midsole and analog
The cross reference of related application
This application claims the U.S. Provisional Patent Application the 61/662nd submitted on June 21st, 2012, No. 826, be entitled as the priority of " foam for midsole and analog ", its whole disclosure is included in this description by reference.
Technical field
Embodiment herein relates to the field for footwear interlayer and other similar application.
Background technology
Ethane-acetic acid ethyenyl ester (EVA) as polymer is used as polymer usually in the foam chemistry of sport footwear cushioning midsole.New EVA is light, relatively cheap and has good buffering property.But in use, described buffering property is tending towards quick disappearance.
Some footwear manufacturer uses more durable polymer (as polyolefin elastomer) and EVA mixing or substitutes EVA completely, to reduce compression set and to improve resilience and durability.But specific elastic foam is expensive, and the scope of performance is limited to a certain extent.Polyolefin has excellent chemical resistance, makes it be difficult to solvent cement bonding, and the surface of expanded polyolefin has when touching and very large becomes cunning trend.Some manufacturers are bonded to polyolefinic amount (being usually less than 15%) in whole midsole by restriction and solve this problem.Other manufacturers use expanded polyolefin at local place, such as, below heel center, then use standard foam in all the other positions of midsole.
Brief description of drawings
By description detailed as follows and by reference to the accompanying drawings and claims, embodiment will be easy to be understood.Embodiment illustrates the present invention in an exemplary fashion but is not restricted to the figure in accompanying drawing.
Fig. 1 is a form, according to various embodiment, describe of a kind of high-performance foam compared with conventional eva foam concrete, the composition of nonrestrictive example.
Fig. 2 is a form, according to various embodiment, describes the multiple character of the high-performance foam of the Fig. 1 compared with the eva foam of routine.
The detailed description of open embodiment
In following detailed description, reference wherein accompanying drawing, and by implementing shown in exemplary.This also can be understood to utilize other embodiments, and the change of structure or logic does not exceed scope of the present invention.Therefore, following detailed description does not limit the present invention, and the scope of embodiment is defined by appended right and its equivalence.
Various operation can be described to discontinuous operation sequentially, contributes to a kind of the mode understanding embodiment; But the order of explanation should not be understood to that described operation is sequentially independently.
Described invention can use the description based on visual angle, as up/down, rear/front and top/bottom.This explanation is only discussed for helping, and is not intended to limit the open embodiment of application.
Term " combination " and " connection " can be used, and their derivative words.Should be appreciated that these terms are not synonym each other.More rightly, in particular embodiments, " connection " can be used to represent the direct physical contact each other of two or more component." combination " can refer to that two or more component direct physical contacts.But " combination " also means that two or more component does not directly contact each other, but still coordinate each other or effect.
For the object illustrated, the phrase of " A/B " or " A and/or B " form is meant to (A), (B) or (A and B).For the object illustrated, the phrase of " at least one of A, B and C " form is meant to (A), (B), (C), (A and B), (A and C), (B and C) or (A, B and C).For the object illustrated, the phrase of " (A) B " form is meant in (B) or (AB), and A is optional component.
Term used in this manual " embodiment (embodiment) " and " embodiment (embodiments) ", they all can refer to one or more identical or different embodiments.In addition, term used in embodiment " comprises (comprising) ", " comprising (including) ", " having (having) " etc. are synonym, and they are as " open (open) " term, and (namely term " comprises (including) " and should be interpreted as " including, but are not limited to ", term " has " and should be interpreted as " at least having ", term " comprise (includes) " should be interpreted as " including but not limited to " etc.).
For any plural number used herein and/or singular references, in this article and/or application in, what those skilled in the art can be suitable is interpreted as odd number and/or odd number is interpreted as plural number by plural number.In this article, for the sake of clarity, various singular/plural can clearly be replaced.
Embodiment herein solves the problem of conventional eva foam and provides high-performance foam preparation and processing method.In various embodiments, when high-performance foam preparation is used in midsole, for the load given between compression period at every turn, described high-performance foam preparation can provide excellent impact energy to absorb, improve energy between the phase of expansion to recover, and reduce repeated impacts and to circulate the compression set brought.
In various embodiments, high-performance foam preparation can utilize block copolymer to realize stability.When not reducing the cementitiousness to footwear parts, compare usual foam, some embodiment can use the polyolefin of higher concentration.Such as, use described high-performance foam in various embodiments, compare with known foam, the polyolefin of higher percentage amounts can be used, and in embodiments, can keep being easier to bonding, there is provided without cunning sensation, and/or bring better buffering effect and durability.In various embodiments, compare single use EVA and/or EVA/ expanded polyolefin, one or more polyolefin buffer bodies and/or olefin block copolymers can combine with ethane-acetic acid ethyenyl ester (EVA), create a kind of foam having excellent restoring force, better tensile strength, reduce contraction, reduce compression set and/or raising adhesion.
In various embodiments, the suitable olefin polymer for the preparation of high-performance foam preparation disclosed herein can comprise linear high-density polyethylene (HDPE), LLDPE (LLDPE; Trade mark as produced by The Dow Chemical Company, Midland, M l is DOWLEX tMlLDPE) and ultralow linear density polyethylene (ULDPE; Trade mark as produced by The Dow Chemical Company is ATTANE tMuLDPE) etc.; Even branching, (trade mark as produced by Mitsui Petrochemicals Company Limited is TAFMER to linear ethylene/alpha olefin copolymer tMcopolymer, and Exxon Chemical Company produce trade mark be EXACT tMcopolymer), even branching, (trade mark as produced by Dow Chemical Company is AFFINITY for the ethylene/alpha-olefin copolymer of substantially linear tM, ENGAGE tMand INFUSE tMcopolymer), and high pressure, radical polymerization ethylene copolymer, such as EAA is (as the PRIMACOR that Dow Chemical Company produces tMpolymer) and the EVA (ESCORENE produced by Exxon Chemical Company tMpolymer, the ELVAX produced by E.I.du Pont de Nemours & Co. tMcopolymer).
In particular embodiments, olefin polymer can comprise even branched linear and substantially linear ethylene copolymer, and its density (testing according to ASTM D-792) scope is about 0.85 to about 0.92g/cm 3, particularly from about 0.85 to about 0.90g/cm 3be that (measuring according to ASTM D-1238 (190/2.16)) about 0.1 is to about 10g/10 minute with melt index.In various embodiments, EVA can containing have an appointment 0.5 to about 50 % by weight the EVA derived from vinylacetate, and the EVA polymer that one or more melt index had (ASTM D-1238 (190/2.16)) are 0.5 to about 10g/10 minute can be comprised.Although disclosed high-performance foam is described as comprising EVA usually, it will be understood to those of skill in the art that, in certain embodiments, EAA (containing having an appointment 0.5 to about 25 % by weight, derived from propylene acid) and the similar polymer containing ethylenic unsaturated carboxylic acid also alternative.
As described herein, the various embodiments of open foam can comprise polyolefin elastomer and/or olefin block copolymers.Term as used herein " polyolefin elastomer " can relate to ethene and other alpha-olefins, such as propylene and octene, copolymer.In various embodiments, metallocene catalyst selective polymerisation ethene and comonomer sequence can be used, and along with the increase of co-monomer content, can prepare and there is more elastomeric polymer, because the poly crystallization of the decohesion of described polymerization single polymerization monomer.In various embodiments, the molecular weight of copolymer can contribute to working properties and the final use performance of determining polyolefin elastomer, and higher molecular weight can improve toughness of polymers.
In various embodiments, use refining metallocene catalyst to prepare polyolefin copolymer, described metallocene catalyst is commonly referred to unit point or constrained geometry catalyst.Described catalyst can have limited transition metal (being generally 4B race metal such as Ti, Zr or Hf) and is clipped between one or more cyclopentadienyl group ring structure and forms steric hindrance polymerization site.In various embodiments, described catalyst can provide single polymerization site, instead of the multidigit point of conventional catalyst, and can provide the ability of the molecular structure of customization ethylene copolymer.
As described herein, term " olefin block copolymers " can refer to the polymer of the chain of the alternating block with " firmly " (high degree of rigidity) fragment and " soft " (high flexibility) fragment, and it is standby and assembling by legal system of shuttling back and forth.In various embodiments, because alternating block type provides the material character of the difference in height alienation along chain, conventional relationship that is flexible and heat resistance is broken and obtains beneficial effect in the polymer.Meanwhile, compare other polyolefin plastomers and elastomer, described material can improve compression set and elastic recovery character.In various embodiments, olefin block copolymers has the heat resistance of polyolefin plastomers and elastomeric flexibility and high density polyethylene (HDPE) simultaneously.
As mentioned above, in various embodiments, high-performance foam can contain EVA, polyolefin elastomer (as ENGAGE tM) and/or olefin block copolymers (as INFUSE tM) mixture.In various embodiments, described mixture can be used for preparing high-performance foam, and described high-performance foam compares the restoring force that conventional eva foam has increase.Such as, in various embodiments, high-performance foam has the restoring force of 48-52% (such as, use the DIN 53512 measuring rubber resilience restoring force to test, described test uses the Schob pendulum announced by International Organization for standardization (IOS); Standard is minimum 45%), compared to about 45% restoring force (standard is minimum 40%) of eva foam.In some embodiments, restoring force refers to the percentage that the energy used for compression foam regains as mechanical power during Foam Expansion.In some embodiments, restoring force falls to foam by making a missile from known height, then tests the height of missile resilience.
In various embodiments, compared with conventional eva foam, high-performance foam also can reduce compression set.Such as, in various embodiments, use ASTM D-395 (B) standard method of test of the compression set character being used for rubber, or use the SATRA TM64 compression set-constant stress method announced by SATRA technique center, the compression set of high-performance foam is maximum is about 45%, but the compression set the most about 60% of eva foam.In various embodiments, compression set can be used as the percentage of the original thickness of sample and tests, and can refer to because permanent deformation causes sample to lose the degree of its part original size.
In various embodiments, compare eva foam, high-performance foam also can reduce shrinkage factor.Such as, in various embodiments, the shrinkage factor of high-performance foam can be about 1% (70Asker C, one hour), but the shrinkage factor of eva foam about 1.5% (comparative example 1:70Asker C, 15 minutes; Comparative example 2:50Asker C, 24 hours).Shrinkage factor can measure with various ways.In one embodiment, sample can be heated to 70 DEG C, keep 15 minutes, be cooled to room temperature, and original size compares Len got and width.In another embodiment, sample can be heated to 50 DEG C, keeps 24 hours, then tests its length and width.
Fig. 1 is a form, according to various embodiment, describe of a kind of high-performance foam compared with conventional eva foam concrete, the composition of nonrestrictive example.In the concrete nonrestrictive example described in FIG, high-performance foam has the EVA (such as about 66-74PHR, about 67-73PHR, about 68-72PHR or about 69-71PHR) of about 65-75PHR (every hundred parts of resins); The polyolefin elastomer of about 15-25PHR is (as ENGAGE tM) (such as, about 16-24PHR, about 17-23PHR, about 18-22PHR or about 19-21PHR); The olefin block copolymers of about 5-20PHR is (as INFUSE tM) (e.g., about 7-18PHR, about 9-16PHR or about 11-14PHR).Term " PHR " and " every hundred parts of resins " refer to the weight portion of described component as used herein, relative to the gross weight of plastics in preparation with other polymer.Such as, the foam of the polyolefin elastomer containing 350g and 650g EVA has whole " resin " weight of 1000g, and wherein polyolefin elastomer is 35PHR and EVA is 65PHR.Term " resin " as used herein does not comprise other compositions, such as pigment, filler, foaming agent and/or crosslinking agent, and the various amounts of described composition do not change the total weight resin for calculating PHR object.
In various embodiments, also a small amount of pigment, filler, foaming agent and/or crosslinking agent can be comprised according to high-performance foam disclosed by the invention.Such as, according to content disclosed by the invention, one concrete, in unrestricted example, high-performance foam can comprise the ZnO of about 1.25 to about 1.75PHR (such as, about 1.3-1.6PHR or about 1.1-1.4PHR), the STA (stearic acid) (such as, about 0.4-0.6PHR) of about 0.3-0.7PHR, the TiO of the filler of about 5-15PHR, about 1.25-1.75PHR 2(such as, about 1.4-1.6PHR), the crosslink agent DCP (cumyl peroxide of the foaming agent (such as, about 2.4-2.6PHR) of about 2.25-2.75PHR and/or about 0.4-0.7PHR; Such as, about 0.5 to about 0.6PHR).
Also illustrate in FIG, can containing the EVA18% of about 70PHR according to high-performance foam disclosed by the invention, the polyolefin elastomer of about 20PHR is (as ENGAGE tM, such as ENGAGE tM8200) and the olefin block copolymers of about 10PHR (as INFUSE tM, such as INFUSE tM9107).Concrete at another, in non-limiting embodiments, still can comprise the ZnO of about 1.5PHR, the TiO of the filler of the STA of about 0.5, about 10PHR, about 1.5PHR according to high-performance foam disclosed by the invention 2, the foaming agent of about 2.5PHR and/or about 0.5PHR DCP (crosslinking agent).In some embodiments, olefin block copolymers up to about 20PHR can be used (as INFUSE tM).Such as, concrete at another, in non-limiting embodiments, high-performance foam can comprise the EVA of about 70PHR, the polyolefin elastomer of about 10PHR is (as ENGAGE tM) and the olefin block copolymers of about 20PHR (as INFUSE tM).Another is concrete, unrestricted embodiment can comprise the polyolefin elastomer of EVA, the about 20PHR of about 60PHR (as ENGAGE tM) and the olefin block copolymers of about 20PHR (as NFUSE tM).In some embodiments, in order to be applicable to special application, rigidity and/or other performance components of footwear can be changed.Such as, in order to increase resilience, olefin block copolymers (such as, INFUSE can be increased in the formulation tM) amount, but, if need more rigid midsole, harder EVA and/or olefin block copolymers (such as, INFUSE) preparation can be selected.
Fig. 2 is a form, according to various embodiment, describes the multiple character of the high-performance foam of the Fig. 1 compared with the eva foam of routine.In various embodiments, in order to obtain required restoring force, density, hardness, tensile strength, shrinkage factor or other character, selected polyolefin and the use amount in high-performance foam can be changed.Of Fig. 2 concrete, in non-limiting embodiments, the character that foam prepared by high-performance foam preparation has is better than conventional eva foam.Such as, example foam has the hardness (Asker C) of 53 and the hardness of eva foam is 55; Density is 0.22g/cm 3and eva foam is 0.23g/cm 3; Restoring force is 48% and eva foam is 43%.The tensile strength that example foam also has is 31.1kg/cm 2and the tensile strength of eva foam is 30kg/cm 2foam, and both example foam and eva foam are greater than 25N/cm with the bonding strength of substrate, all by the test of Ross flex cracking (such as, ASTM D1052) carry out more than 50000 times and do not damage, described example foam has the compression set of 43%, the compression set of eva foam is 55% by comparison, described example foam have 0.8% shrinkage factor and eva foam have 1.2% shrinkage factor.
Although example foam in fig 1 and 2 comprises more than a kind of polyolefin, those skilled in the art can understand and can use single polyolefin.Such as, in one embodiment, high-performance foam can comprise the polyolefin elastomer of 25-50PHR or more (as ENGAGE tM), and without olefin block copolymers (as INFUSE tM).Similarly, in another embodiment, high-performance foam can comprise 25-50PHR or even more olefin block copolymers (as INFUSE tM), and without polyolefin elastomer (as ENGAGE tM).
Although some embodiment has proved in this article and described, persons skilled in the art have been appreciated that a large amount of to substitute and/or equivalent embodiments can replace shown embodiment and description and obtain identical effect, and it does not exceed scope of the present invention.Those skilled in the art the variation pattern of relative broad range can implement described embodiment by easy understand.The application is intended to contain any reorganization and the change of described embodiment herein.Therefore, obvious embodiment is by means of only claim and the restriction of its equivalents.

Claims (21)

1., for a high-performance foam for midsole, comprising:
The polyolefin elastomer of at least 15 parts/hundred parts resins (PHR);
At least olefin block copolymers of 5PHR; With
The ethane-acetic acid ethyenyl ester (EVA) of no more than 75PHR.
2. the high-performance foam of claim 1, it comprises:
The polyolefin elastomer of 15-25PHR;
The olefin block copolymers of 5-20PHR; With
The EVA of 65-75PHR.
3. the high-performance foam of claim 1, it comprises the polyolefin elastomer of 18-22PHR.
4. the high-performance foam of claim 1, it comprises the olefin block copolymers of 9-16PHR.
5. the high-performance foam of claim 1, it comprises the EVA of 68-72PHR.
6. the high-performance foam of claim 1, it comprises
The polyolefin elastomer of 18-22PHR;
The olefin block copolymers of 9-16PHR; With
The EVA of 68-72PHR.
7. the high-performance foam of claim 1, it comprises:
The polyolefin elastomer of 20PHR;
The olefin block copolymers of 20PHR; With
The EVA of 60PHR.
8. the high-performance foam of claim 1, it comprises:
The polyolefin elastomer of 20PHR;
The olefin block copolymers of 10PHR; With
The EVA of 70PHR.
9. the high-performance foam of claim 1, wherein EVA is EVA18%.
10. the high-performance foam of claim 1, the compression set that wherein high-performance foam has is less than 45%, and restoring force is greater than 45%, and bonding strength is greater than 25N/cm.
11. 1 kinds of high-performance foams for midsole, it comprises:
Ethane-acetic acid ethyenyl ester (EVA); With
The ethylene/alpha-olefin polymer of the even branching of 25-50PHR, linear or substantially linear, the density that wherein said even branching, linear or substantially linear ethene/alpha-olefine polymers has is 0.85-0.92g/cm 3, and melt index is 0.1-10g/10 minute.
The high-performance foam of 12. claims 11, wherein evenly branching, linear or substantially linear ethene/alpha-olefine polymers comprises polyolefin elastomer and/or olefin block copolymers.
The high-performance foam of 13. claims 11, the compression set that wherein high-performance foam has is less than 45%.
The high-performance foam of 14. claims 11, the restoring force that wherein high-performance foam has is greater than 45%.
The high-performance foam of 15. claims 11, the bonding strength that wherein high-performance foam has is greater than 25N/cm.
The high-performance foam of 16. claims 11, the compression set that wherein high-performance foam has is less than 45%, and restoring force is greater than 45%, and bonding strength is greater than 25N/cm.
17. 1 kinds of high-performance foams for midsole, it comprises:
At least polyolefin of 15PHR; With
Be not more than the ethane-acetic acid ethyenyl ester (EVA) of 75PHR, the compression set that wherein high-performance foam has is less than 45%, and restoring force is greater than 45%, and bonding strength is greater than 25N/cm.
The high-performance foam of 18. claims 17, it comprises:
The polyolefin of 15-50PHR.
The high-performance foam of 19. claims 17, wherein polyolefin comprises polyolefin elastomer and/or olefin block copolymers.
20. 1 kinds of methods for the preparation of high-performance midsole, it comprises:
Mixed ethylene-vinyl acetate (EVA), polyolefin elastomer and olefin block copolymers are to form EVA/ polyolefin blend; With
EVA polyolefin blend described in compression molding and form midsole.
The method of 21. claims 20, wherein mixes the polyolefin elastomer of EVA, 15-25PHR and the olefin block copolymers of 5-20PHR that EVA, polyolefin elastomer and olefin block copolymers comprise mixing 65-75PHR.
CN201380033063.0A 2012-06-21 2013-06-21 Foam for footwear midsole and the like Pending CN104684432A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US201261662826P 2012-06-21 2012-06-21
US61/662,826 2012-06-21
PCT/US2013/047167 WO2013192581A1 (en) 2012-06-21 2013-06-21 Foam for footwear midsole and the like

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