A step ahead

Voralast polyurethane systems

FOOTWEARfor thesystems

Polyurethane

industry

Polyurethane elastomersare widely used by thefootwear industry for theproduction of soles whichcan be molded as units ordirectly on the shoe. Dow has achieved in thisfield of application a know-how and experiencethat are recognized by theindustry. Dow successfullymarkets fully formulatedpolyurethane shoe solingsystems worldwide commercialized under thetrademark Voralast.Voralast systems are basedboth on ester or etherpolyol technologies. These technologies are suitable for different end-uses and performdifferent processing characteristics. Polyesterbased systems offer greaterchemical and abrasionresistance, while ethersystems exhibit superiorhydrolysis resistance.Among the differences between thetwo production techniquesis the processing temperature: polyetherbased systems are liquid atroom temperature, whilepolyesters require about45°C. Today polyether andpolyester systems are on anequal standing in the shoeindustry giving shoe soleproducers the right choicefor any different production requirement.

Design, performanceand productionBased on a clear understanding of the changing designneeds of the shoe industry,Voralast systems can offershoe-designers the capability to easily develop and produce a completerange of shapes and colors.Voralast systems offer thepossibility to successfullychannel the versatility ofpolyurethanes straight intothis fashion-consciousindustry. Apart from theirexcellent workability, theseversatile systems alsoprovide excellent comfort,light weight, resistance tooil and chemicals,outstanding flexuralfatigue and slip resistance.Voralast systems alsoperform a provenprocessability: being easyto handle, they have been formulated tomeet all different processors'requirements. Recognizedproduction advantagesinclude the flexibility oftheir processingparameters, demold times,and the easy cleaning ofthe molds.Furthermore, the recipe canbe further refined andcustomized to meet otherprocessing needs andenhance productivity, stillensuring quality andreliability.

Voralast “polyethersolution”In some footwearapplications in the pastpolyester systems werepreferred for some of theirperformance andproduction characteristics.Now this has changed: Dowafter extensive researchefforts has been able toproduce unique polyethersystems which offersignificant performanceimprovements.First of all these fully waterblown polyether basedsystems can now offermanufacturers substantiallyimproved elasticity andflexural resistance at verylow temperatures, as well ashydrolitic resistance andexcellent grip.These polyether systemshave dramatically enhancedthe molding process with acut in demold times,reduced frequencies ofcleaning and improveddegreasing. As for processenergy requirementsVoralast systems are alsoenergy-saving, as they canbe processed at roomtemperature. Thesepolyether solutions havebeen able to reduce moldeddensity - lowering them toequal or better thanpolyester - withoutmodifications in shrinkage.Voralast polyether systemsare a concrete alternativeto polyesters and Dow’s customers will alsobenefit from Dow'sproprietary polyethersystems technology.

Voralast water-blownpolyether systemsThanks to continuousresearch and developmentefforts, Dow has been ableto successfully producepolyether basedpolyurethane shoe solingsystems blown by CO2 -generated by the water-isocyanate reaction - whichare commercialized withthe trademark Voralast. To replacechlorofluorocarbons orother auxiliary blowingagents a soft-segmentprepolymer technology -that allowed the design ofa microcellular polymerusing water - wasdeveloped. That resultednot simply in animprovement inenvironmentalperformance, but also in anexcellent balance ofphysical and processingproperties.In a polyether based water-blown polyurethane shoesoling system the surfacehardness is lower than thatachieved with standardpolyether systems,

nevertheless the foam coredensity is higher so thatload-bearing is definitely superior.This end-use performanceis combined with excellentprocessing performance.The lower viscosity of thesepolyether systems improvesflow in the mold, givingbetter surface finish. The shoe soles molded withwater blown systems haveexcellent appearance, greatflexibility and a degree ofslip resistance to fulfillmany markets’requirements, especially incold weather environments.Flexural fatigue resistanceremains good at lowtemperatures, even downto -30°C.

VORALAST*polyurethanesystems

Voralast GF Low density systems to produce sandals and slippers

Voralast GS Formulations for the sport shoe market

Voralast GT Systems molded to produce safety shoes and boots

Voralast GB Systems for the production of business shoes

Voralast GL Systems for the production of leisure and recreation shoes

Series of polyurethane fullyformulated systems both polyetherand polyester for the footwearindustry.

Polyurethane elastomersare widely used by thefootwear industry for theproduction of soles whichcan be molded as units ordirectly on the shoe. Dow has achieved in thisfield of application a know-how and experiencethat are recognized by theindustry. Dow successfullymarkets fully formulatedpolyurethane shoe solingsystems worldwide commercialized under thetrademark Voralast.Voralast systems are basedboth on ester or etherpolyol technologies. These technologies are suitable for different end-uses and performdifferent processing characteristics. Polyesterbased systems offer greaterchemical and abrasionresistance, while ethersystems exhibit superiorhydrolysis resistance.Among the differences between thetwo production techniquesis the processing temperature: polyetherbased systems are liquid atroom temperature, whilepolyesters require about45°C. Today polyether andpolyester systems are on anequal standing in the shoeindustry giving shoe soleproducers the right choicefor any different production requirement.

Design, performanceand productionBased on a clear understanding of the changing designneeds of the shoe industry,Voralast systems can offershoe-designers the capability to easily develop and produce a completerange of shapes and colors.Voralast systems offer thepossibility to successfullychannel the versatility ofpolyurethanes straight intothis fashion-consciousindustry. Apart from theirexcellent workability, theseversatile systems alsoprovide excellent comfort,light weight, resistance tooil and chemicals,outstanding flexuralfatigue and slip resistance.Voralast systems alsoperform a provenprocessability: being easyto handle, they have been formulated tomeet all different processors'requirements. Recognizedproduction advantagesinclude the flexibility oftheir processingparameters, demold times,and the easy cleaning ofthe molds.Furthermore, the recipe canbe further refined andcustomized to meet otherprocessing needs andenhance productivity, stillensuring quality andreliability.

Voralast “polyethersolution”In some footwearapplications in the pastpolyester systems werepreferred for some of theirperformance andproduction characteristics.Now this has changed: Dowafter extensive researchefforts has been able toproduce unique polyethersystems which offersignificant performanceimprovements.First of all these fully waterblown polyether basedsystems can now offermanufacturers substantiallyimproved elasticity andflexural resistance at verylow temperatures, as well ashydrolitic resistance andexcellent grip.These polyether systemshave dramatically enhancedthe molding process with acut in demold times,reduced frequencies ofcleaning and improveddegreasing. As for processenergy requirementsVoralast systems are alsoenergy-saving, as they canbe processed at roomtemperature. Thesepolyether solutions havebeen able to reduce moldeddensity - lowering them toequal or better thanpolyester - withoutmodifications in shrinkage.Voralast polyether systemsare a concrete alternativeto polyesters and Dow’s customers will alsobenefit from Dow'sproprietary polyethersystems technology.

Voralast water-blownpolyether systemsThanks to continuousresearch and developmentefforts, Dow has been ableto successfully producepolyether basedpolyurethane shoe solingsystems blown by CO2 -generated by the water-isocyanate reaction - whichare commercialized withthe trademark Voralast. To replacechlorofluorocarbons orother auxiliary blowingagents a soft-segmentprepolymer technology -that allowed the design ofa microcellular polymerusing water - wasdeveloped. That resultednot simply in animprovement inenvironmentalperformance, but also in anexcellent balance ofphysical and processingproperties.In a polyether based water-blown polyurethane shoesoling system the surfacehardness is lower than thatachieved with standardpolyether systems,

nevertheless the foam coredensity is higher so thatload-bearing is definitely superior.This end-use performanceis combined with excellentprocessing performance.The lower viscosity of thesepolyether systems improvesflow in the mold, givingbetter surface finish. The shoe soles molded withwater blown systems haveexcellent appearance, greatflexibility and a degree ofslip resistance to fulfillmany markets’requirements, especially incold weather environments.Flexural fatigue resistanceremains good at lowtemperatures, even downto -30°C.

VORALAST*polyurethanesystems

Voralast GF Low density systems to produce sandals and slippers

Voralast GS Formulations for the sport shoe market

Voralast GT Systems molded to produce safety shoes and boots

Voralast GB Systems for the production of business shoes

Voralast GL Systems for the production of leisure and recreation shoes

Series of polyurethane fullyformulated systems both polyetherand polyester for the footwearindustry.

properties and thermalinsulation at lowtemperature down to -20° C results were betterthan expected. These innovativepolyether dual densitysystems perform a"rubber-like" touchcombined withoptimum wear-resistance. Key factorsfor polyether basedpolyurethane systemsare the bacteriologicand hydroliticresistance, that are acharacteristic of thistechnological innovation.Also thanks to the lowviscosity of polyether based

systems when compared topolyesters, a perfect fillingof the mold andconsequently a perfect copyof the design of the sole canbe achieved.The dual density "rubber-like" polyether systems canbe easily processed with theexisting equipment at atemperature around

25°C for bothcomponents.Thesesystems

are fully water blown. Dowcan also offer tailor madepolyether dual densitysystems to fulfill therequirements of thedifferent manufacturerswhile also providing highly qualified technical support.

Footwear with RIMtechnologyAdapted from theautomotive industry thistechnology produces atough, compactpolyurethane polyether withgood physical properties andvery fast curing, oftenrequiring a demolding timeof just 30 seconds. The main applications forthis technology are: dualdensity shoe soles, producedby injecting the compact

layer first,

followed by theexpanded layer shortlyafter; and multi-print injection in which 2, 4 or even 6 soles can

be molded ina singleoperation.

Dual densitypolyethersystems At Dow we have designed anew formulation based ondual density productiontechnology. Tests onsystems developed with thistechnology usingpolyurethane polyetherbased resins have beencompleted with excellentresults at Dow's FootwearTechnology & DevelopmentCenter in Correggio (Italy)in cooperation with well-known shoe manufacturers.Results were impressiveboth for direct injectionmolding, as well as pouringfor the production of bootsand shoe soles. In theseproducts theadhesionbetween thetwo layers -the compactlayer andthe foamedone - wasexcellent. Asfor slipresistance

Low density andhigh productivitysandals andslippersIn a market where qualityalso means productivity,Dow commercializes VoralastGF both polyether andpolyester based systemsthat can fulfill therequirements for lowmolding density and shortdemold times. Especially with thepolyether based systemsdensities can be reduced byup to 10-15% and demoldtimes can be brought downto 2 minutes.

The resulting sole is lighterand better looking and inthe meantime costs arereduced. The processing parametersare extremely flexible for both polyester and

polyether systems andconsequently all

fashion designchanges can beeasily met.Properties likepaintabilityhave beengreatlyimproved.

Voralast GS seriesfor sport shoesComfort, grip and durabilityare critical factors in thehighly specialized sportsshoe market, Voralast GSsystems meet all the moststringent requirementsoffering a suitable range ofmono, bi-densityformulations that areusually injected directly onto the upper. These systems can be usedfor the outsoles, as well asthe midsoles: the compactoutsoles perform atextremely high levels ofabrasion and flex fatigue

resistance; while thesoft, light and elastic

midsoles offeroptimum comfort.

A newapplication for

Voralast GS systems aretrekking, hiking andmountain shoes. Theseshoes need to be light butvery resistant performingwith superior gripcharacteristics at lowtemperatures even on icysurfaces. Voralast GS seriessystems are the right choicefor this demandingapplication, providingmaximum comfort anddurability coupled withgood flexibility andoptimum thermalinsulation.

A combination of comfort and protection forWellington andsafety bootsFor tough conditions inwhich protracted wearrequires a combination ofcomfort and protection,Dow has produced Voralastpolyurethane systemsespecially formulated forWellington and safetyboots. With the support ofmachine manufacturers, acomplementary technologyhas also been developed,enabling the boots to bemade in just one “shot”.The excellent tearresistance and the improvedinsulation properties aresome of the benefits gainedwith this new technique

and, at the same timethe light weight of

these boots, theirgrip andflexibility granthigh levels ofcomfort.

The anti-

static properties obtainedwith these boots meet thehighest standards andresistance to abrasion, flexfatigue, solvent and oilprove to be excellent. Gripproperties are morethansatisfactoryin mostconditions.

Voralast GT series: the right choicefor safety shoesVoralast GT systems can bemolded to produce a widerange of densities andhardness values for safetysoles, all conforming to therigorous specifications ofthe EN 344 standard forindustrial footwear. Injected directly ontothe upper, thesetough Voralastsystems are offeredas mono andbi-colorformulations,performing withexcellent abrasion,flex fatigue, aswell as solvent andoil resistance. Theanti-static propertiesmeet the higheststandards and grip isgood in mostconditions.

withstand even the mostsevere temperatures,

providing thequalitycomplement toa quality upper.These VoralastGB systems canbe molded at anew range ofdensities and

demold timeshave been

improved. Also asper physical andmechanicalproperties,particularly in terms of tensile

and tear strengths andelongation, these

systems perform withexcellent characteristics.Furthermore the level ofwear, slip and flex fatigueresistance is very high evenat very low temperatures.

Voralast GL seriesfor leisure and recreationWhen colors and comfortare keys to success, VoralastGL systems offer cost-effective solutions both inpolyether or polyester.The soft soles for leisureand recreation shoes arepoured or injected with orwithout the upper andthrough the addition of

suitable pigments allfashionable colors can

be easilyobtained. Good process

finishing, goodsoftness for

better comfort,improved elasticity forbetter flexibility, a highlevel of slip resistance alsoat low temperatures (-20°C)and excellent wear and flexresistance values are onlysome of the properties thatcharacterize Voralast GLsystems.

Stylish and longlasting businessshoes with VoralstGB seriesIn the segment of businessshoes the requirements arecomplex and theapplication conditions aretough, Voralast GB systemsmeet the need forcomfortable, stylish andlong lasting shoe soles.Based on polyethers oron traditionalpolyesters, Voralast GBsystems are perfectlysuitable for the

production ofsoles that

Notice: The information and data contained herein do not constitute sales specifications. The product properties maybe changed without notice. No liability, warranty or guarantee of product performance is created by this document. It is the Buyer’s responsibility to determine whether Dow products are appropriate for Buyer’s use and to ensure thatBuyer’s workplace and disposal practices are in compliance with applicable laws and regulations. No freedom from anypatents or other industrial or intellectual property rights is granted or to be inferred. (September, 2000)

Voracor*

Systems for rigid foamsused in theproduction ofinsulating material for prefabricatedpanels for theconstruction industry,commercialrefrigerators, water

heaters and otherapplications of rigid foams.

Voratec*

Systems for theproduction of expandedrigid foams for theinsulation of domesticappliances.

Voralux*

Systems for theproduction of integralskin and flexible foamsused in the furnitureindustry.

Specflex*

Systems for theproduction of flexible and integralskin foams for thetransportationindustry as steeringwheels, headrests anddashboards.

Spectrim*

Systems for componentsmolded with RIM(Reaction InjectionMolding) technology.

Voralast*

Systems for expandedmicrocellular foams, both ester and ether, for anytype offootwearsoling fromsafety to leisure and sport.

Voratron*

Systems for elastomersand casting resins forelectronic and electricinsulation.

Specfil*

Systems for filtergasketing, both for industry andautomobiles.

Voramer*

Polyurethane systems forelastomeric applicationsand for the production ofbinders, adhesives,coatings and sealants.

Vorastar*

Tailored liquidpolyurethane systems forhigh performancespecialized applications.

Hypol*

Polyurethane prepolymersspecially designed for themanufacture of hydrophilicpolyurethane foams,elastomers, coatings,adhesives or gels.

SYSTEMSpolyurethane

Dow

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Voralast polyurethane systems

* Trademark of The Dow Chemical Company