text: the process for the production of the bituminous polymer emulsion is detailed as follows : the asphalt is heated to 250 ° f . and optionally a high melting point wax ( 165 ° f .) is added to the melt . the emulsion polymer at 50 - 55 % solids is either cooled from the emulsion polymerization process to approximately 145 ° f . or heated in batch quantities from previous production to approximately 145 ° f . a defoaming agent such as &# 34 ; dow corning - h - 10 &# 34 ; silicone emulsion may be added at 0 . 2 to 0 . 5 by wt . of polymer emulsion . the asphalt / wax blend is passed simultaneously with the polymer emulsion at 40 p . s . i . air pressure through a colloid mill at about 3500 rpm with a mix ratio of asphalt blend / polymer emulsion of 70 - 20 / 30 - 80 , respectively , producing an emulsion of asphalt within the water phase of the polymer emulsion . the product emulsion exits the mill at a temperature of 160 °- 170 ° f . and is immediately cooled to approximately 120 ° f . using heat exchangers . slow agitation must be provided to maintain uniform temperatures while cooling and prevent localized over heating . the resultant emulsion is approximately 70 % solids and exhibits dilatant flow properties . the emulsions produced are of fine particle size microscopically sized at 2 to 10 microns . the polymer particles range from 0 . 1 - 0 . 25 microns . the emulsions are brown in color when in the wet state but dry black . addition of carbon black at 1 - 3 % by wt . of total emulsion solids will produce a black color in the wet state . the ph of the ethylene / vinyl acetate based emulsions is normally 4 . 0 - 5 . 0 and should be maintained below 7 . 0 . other emulsions , e . g ., styrene butadiene , may require alkaline ph . the emulsions so produced exhibit excellent package stability at 120 ° f . for six months . asphaltic materials are normally selected on the basis of physical properties such as penetration , viscosity and ductility . hardness as measured by penetration values is a major limiting factor in the use of these materials due to reduced or insufficient flexibility and inability to resist cracking due to substrate movement . softening points range of the asphaltic / coal tar pitch must be maintained above 120 ° f . since the material remains thermoplastic and use areas of high ambient air temperature will require high softening points to avoid migration or deformation of the dried coating material . a monomer mixture consisting of 65 % vinyl acetate , 20 % ethylene , 15 % acrylic ( 2 ethylhexyl acrylate ) was polymerized in water using normal technique and using surfactant blend of nonionic and anionic surfactants typically and protective colloid ( hydroxyl ethyl cellulose ). ______________________________________1 . tensile strength 420 psi2 . elongation 500 % 3 . % solids 554 . ph 4 . 05 . clarity white / opaque______________________________________ the emulsion was cooled to room temperature and stored for seven days . a defoamer was added such as &# 34 ; dow corning h - 10 &# 34 ; silicone emulsion at 0 . 27 . the emulsion mixture was then heated to approximately 145 ° f . and pumped through a colloid mill at 40 psi air pressure concurrently with an asphalt heated to 250 ° f . the ratio of asphalt to polymer emulsion entering the colloid mill was 1 to 2 by weight of solid polymer and asphalt . the exit temperature was 160 °- 170 ° f . the solids were 70 % by weight and the color was dark brown . the resultant emulsion exhibited good storage stability and the film showed good flexibility , extensibility and resistance to moisture . upon air drying it formed a continuous film , free from mudcracking . it was capable of more elongation than an asphalt emulsion without the polymer . the above emulsion was processed with an asphalt / wax blended at a proportion of 90 / 10 % by weight . the ratio of asphalt / wax to polymer emulsion entering the colloid mill was 1 to 1 by weight of solid polymer and asphalt . the resultant emulsions exhibited the same characteristics as in example 1 with improved flow characteristics and moisture resistance . commercial emulsion &# 34 ; elvace 1877 &# 34 ; manufactured and sold by reichhold was heated to 145 ° f . and the same process and ratios were followed as in example 2 . the resultant polymer / asphalt emulsion had the same characteristics as in example 2 . &# 34 ; elvace 1877 &# 34 ; is manufactured by the emulsion polymer division , reichhold , dover del ., and is ethylene / vinyl acetate having the structure : ## str2 ## stability data for selected samples above are shown in table 1 . table 1______________________________________ viscosity ( centipoise ) temp 77 ° f . example 1 day 1 week 2 weeks 6 months______________________________________2 2000 3000 3000 40003 4500 4400 4500 4900______________________________________viscosity ( centipoise ) temp 120 ° f . example 1 day 1 week 1 month 6 months______________________________________2 3000 3000 3300 39003 4000 4500 4400 5000______________________________________ 2 . add &# 34 ; aristowax 165 &# 34 ; ( a fully refined parafin wax with a melting point of 156 °- 165 ° f . manufactured by union oil of california ), 15 % on asphalt solids 3 . add 1 % by weight oleic acid and 1 % by weight emulsifier such as an amine long - chain alcohol sulfate manufactured by dupont de nemours company and sold under the trademark &# 34 ; duponol w . s .&# 34 ; 4 . preheat &# 34 ; elvace 1877 &# 34 ; reichhold polymer emulsion to 145 ° f . under agitation 5 . add 8 lbs ./ 100 gallons &# 34 ; dow corning h - 10 &# 34 ; defoamer ( dow corning ) to &# 34 ; elvace 1877 &# 34 ; 6 . emulsify by means of a colloid mill at 3500 rpm with mix ratio by volume : 40 % asphalt to 60 % &# 34 ; elvace 1877 &# 34 ; emulsion the resultant emulsion is : 72 % solids and exhibits dilatant flow properties . this vehicle system has shown very good early water resistance and low moisture vapor transmission . the addition of the &# 34 ; aristowax 165 &# 34 ;, refined parafin reduces the viscosity of the &# 34 ; ar 8000 &# 34 ; asphalt and allows emulsification at lower temperatures . &# 34 ; ar 8000 &# 34 ; asphalt is sold by huntway refining company of northern california of benecia , calif . and has a soft point of 115 , a viscosity of 55 cst at 350 ° f ., a flash point of 530 ° f . and original penetration at 77 ° f . of 53 . the emulsions produced are of small particle size when viewed microscopically at 1oox and the procedure for producting small particle size emulsions must be standardized for production batches to ensure control . ______________________________________ ( a ) &# 34 ; ar 8000 &# 34 ; asphalt cement 32 . 5 lbs . ( huntway refining company ) graded by vis - cosity according to astm d 3381 ( b ) &# 34 ; aristowax 165 &# 34 ; ( union oil company ) 2 . 6 lbs . ( c ) &# 34 ; elvace 1877 &# 34 ; eva emulsion ( reichhold ) 4 gals . ( d ) &# 34 ; dow corning h 10 &# 34 ; defoamer 20 gms . ( e ) basf wyandotte &# 34 ; pluronic l61 &# 34 ; surfactant 20 gms . ( f ) aqueous carbon black dispersion - various 200 gms . suppliers ( g ) water 1 gal . ______________________________________ ( b ) break up wax and add to asphalt with agitation , heat to 220 °- 230 ° f . ( d ) add water to &# 34 ; elvace 1877 &# 34 ; eva ( reichhold ) emulsion and heat in a closed container to 120 °- 130 ° f . ( f ) add &# 34 ; pluronic l61 &# 34 ; ( basf wyandotte ) which is a surfactant having an average moleculr weight of 2000 , a liquid having a brookfield viscosity of 325 cps , a specific gravity of 1 . 01 at 25 ° c ., a cloud point of 24 ° c . in a 1 % aqueous solution and a pour point of - 29 ° c . ( g ) add carbon black - mix 5 - 10minutes then pour emulsion mixture into preheated pressure pot . preheat the pressure pot with hot ( 120 ° f . water ) and drain just prior to adding latex mixture ( j ) open valve from latex pressure pot and start colloid mill ( k ) open valve from asphalt pot slowly until viscous dark brown product emulsion emerges . ( 1 ) continously agitate the product emulsion while it cools to prevent its surface from skinning . ( m ) continue agitation until mixture is below 110 ° f . and seal in lined cans . the product emulsion should be agitated at exit to prevent localized exposure to elevated temperature since in bulk the central area will tend to cool very slowly and tend to destabilize the emulsion and create lumps or agglomerates . it has been found that the preparation of emulsion polymers with particle size of 0 . 1 - 0 . 3 microns prepared with anionic and nonionic surfactants at very low levels -- 1 - 3 % based on total monomer solids with optionally 0 . 2 - 0 . 5 % protective colloid such as hydroxylethyl cellulose -- can be used to co - emulsify coal tar pitch or asphalt to produce stable emulsions of polymer / asphalt / coal tar which consist of from 20 - 70 % asphalt solids and from 80 - 30 % polymer solids . the resultant emulsion may have up to 75 % total solids in the above proportions of polymer / bitumen . the optional use of crystalline hydrocarbon waxes such as &# 34 ; aristowax 165 &# 34 ; ( union oil co .) melted into the liquid asphalt at levels of 10 - 15 % based on wt . of asphalt has also provided improved water resistance in the polymer / asphalt films produced . the addition of wax to the asphalt mixture tends to lower the melt viscosity with resultant improved processing time . the emulsions produced by mixing molten asphalt with latex generally exhibit dilatant flow properties ( good penetration into porous substrates but difficult to atomize through an airless spray ) which are advantageous in their use as horizontal roof coatings and horizontal surface sealers . the emulsion exhibits superior water resistance , excellent resistance to re - emulsification and very low moisture vapor transmission rates . depending on the polymer type , molecular weight , particle size distribution , and the physical properties of the bituminous material , the resultant dry film will vary in cohesive or adhesive strength , elongation and tensile properties , and solvent or chemical resistance properties . alternatives to asphalt to be used in conjunction with or instead of , may include coal tars , lignite or gilsonite . commercially typical asphalts might be huntway ar - 4000 and ar - 8000 . the asphaltic material used ranged in physical properties with ring and ball softening points of 110 °- 160 ° f . ( the american society for testing and materials , astm d36 - 76 ), ductility + 100 cm ( astm d113 - 79 ) and penetration ranges of 20 - 70 at 77 ° f . ( astm d5 - 73 ; reapproved 1978 ) the physical properties of the polymer eaulsion should complement those of the bituminous material ( i . e .) low glass transition temperature with high distensibility and elongation . polymer emulsions used herein as preferred embodiments of the invention and cited herein but not excluded hereto were produced from vinyl acetate , ethylene and acrylic monomer combinations exhibiting dry film properties as follows : alternative emulsion copolymers that may be considered include : acrylics , acrylic - methaacrylic copolymers , styrene butadiene copolymers , butadiene - acrylonitrile , butyl rubber emulsions , vinyl chloride copolymers , vinyl acetate copolymers and vinylidene chloride copolymers . these bituminous emulsion / polymer emulsion combinations are found to be extremely water resistant after dying . in addition , they possess other advantageous physical , mechanical and rheological characteristics which cold blends of like materials lack .