Hot polymerized emulsion styrene butadiene rubber

Ashland is the leading provider of crosslinked and non-crosslinked hot polymerized emulsion styrene butadiene rubber (eSBR) polymers for the adhesives and sealant industry.

Our non-crosslinked polymers are recommended for a variety of adhesive and sealant applications. When incorporated in a solvent along with appropriate tackifier, these polymers produce tacky cements for bonding, coating and sealing applications, including tapes and labels.

Our terpolymers partially crosslinked with divinylbenzene produce adhesives and sealants with a non-stringy, buttery consistency. They are particularly useful for caulking compounds, mastics and sprayable adhesives. Adhesives produced with polymers such as SBR 10090C, SBR 1009AF and SBR 4503 provide a clean breakaway when caulked or troweled. When used in expandable sealants, these polymers offer controlled expansion. These polymers produce extruded profiles with excellent dimensions (low die swell).

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Processability and FormulationSee the versatility of our polymers

Non-crosslinked eSBR rubbers can be handled by most mixers, although the efficiency will depend on mixer design, solvent solubility parameters and order of addition. An exception is SBR 1012; because it is a high molecular-weight polymer it requires high-shear mixing. Because of their structure, crosslinked polymers usually require greater shear energy to achieve a satisfactory blend.

For this reason, mixers with high-shear impellers circulating with high peripheral speed are recommended; good agitation is achieved even in high-viscosity solutions. Using our crumb rubbers simplifies mixing. as the resin and solvent can be added directly to the mixer. Because of the large surface area of the crumbs, incorporation of rubber and other ingredients is faster with milled or ground bale rubber.

The same mixers can be used with bale rubber, however milling or grinding is usually required first.

Sample formulations for adhesives and sealants

The following starting formulations demonstrate the versatility of our polymers. The final choice of polymers is dependent on the end-use application and its property requirement. Additional information on our hot and cold SBR polymers can be obtained by calling +1 800 962 8324.

Pressure-Sensitive Adhesive   Pressure-Sensitive Adhesive   Pressure-Sensitive Adhesive
Ingredients, PHR     Ingredients, PHR     Ingredients, PHR  
ISP SBR 1006 100   ISP SBR 1006 100   ISP SBR 1011 100
Piccolyte A 135 100   Piccolyte A 135 100   Zonatac NG98 100
Irganox 1520 2   Irganox 1520 2   Irganox 1520 2
Toluene 100   Toluene 100   Tolulene 100
Hexane 900   Heptanes 900   Heptanes 900
Total 1202   Total 1202   Total 1202
               
% Solids 16.81   % Solids 16.81   % Solids 16.81
Brookfield Viscosity cP 210   Brookfield Viscosity cP 135   Brookfield Viscosity cP 95
PSTC 180° Peel, lbs/in 5.41   PSTC 180° Peel, lbs/in 4.8   PSTC 180° Peel, lbs/in 4.06
Loop Tack-PSTC 16A 0.75   Loop Tack-PSTC 16A, lb/in 1.56   Loop Tack-PSTC 16A, lb/in 2.83
               
Pressure-Sensitive Adhesive   Pressure-Sensitive Adhesive   Floor and Wall Tile Mastic
Ingredients, PHR     Sprayable Ingredients, PHR   Ingredients, PHR  
ISP SBR 1011 100   SBR 1009AF 100   ISP SBR 1013 25
Zonatac NG98 100   ISP SBR 1009OC 25   ISP SBR 1009OC 75
Irganox 1520 2   Pentalyn H 95   Calcium Carbonate 40
Toluene 100   Irganox 1520 1   Dixie Clay 120
Hexanes 900   Cyclohexane 300   Coumarone Indene Resin 45
Total 1202   Naphtha (Benzine) 450   Piccolyte A 135 50
      Total 971   Antioxidant 2246 2
% Solids 16.81         Hexane 200
Brookfield Viscosity cP 80   % Solids 22.76   Total 557
PSTC 180° Peel, lbs/in 4.5   Brookfield Viscosity cP 4960      
Loop Tack-PSTC 16A , lb/in 3.5   PSTC 180° Peel, lbs/in 1.02      
      Loop Tack-PSTC 16A 0.7      
               
Caulking (Sealing) Cement   Floor and Wall Tile Mastic   Construction Mastic
Ingredients, PHR     Ingredients, PHR   Ingredients, PHR  
ISP SBR 1013 25   ISP SBR 4503 100   ISP SBR 4503 50
ISP SBR 1009OC 75   CaCO3 40   SBS 1102 50
Agerite Superlite* 3   Dixie Clay 120   Kaolin Clay 130
White Mineral Oil 35   Coumarone Indene Resin 45   Calcium Carbonate 130
Atomite 150   Piccolyte A 135 50   Pentalyn H 123
Camel CARB 75   Antioxidant 2246 2   Antioxidant 2246 2
Solka Floc SW 40 5   Hexane 200   Heptanes 157
Stabelyte Ester 10 20   Total 557   Toluene 104
TiO2 5         Total 746
Cyclohexane 75            
Xylene 50         Total Solids ~65%
Heptanes 75            
Total 593            
               
Starting Formulation  

Mixing process

Aerosol spray adhesive    

1) Load 90 percent of the solvent and mix well.
2) Add the antioxidant and stir until well mixed.
3) Add all the tackifier and mix using medium shear until completely dissolved.
4) Add half the rubber under shear; mix until it is well wetted and is starting to disperse.
5) Add the remaining rubber and mix under high shear until smooth.
6) Adjust the viscosity as desired using the remaining solvent.

ISP SBR 1009AF2a 100  
Pentalyn* Hb 75  
Hexanec 800  
Irganox* 1520d 1.5  
Total 976.5  
   
Final solids approximately
18%
 
Specific Gravity 0.72            

 

a) SBR 1009 AF2 is a crosslinked crumb SBR with 23.5 percent bound styrene; this product contains between 3 to 5 wt % calcium carbonate as a partitioning agent to prevent the crumb blocking during storage and transport. The very high level of crosslinking in SBR 1009 AF2 makes this rubber particularly suited to aerosol spray applied adhesive formulations. The high gel content results in a clean cobweb-free spray pattern. SBR 4503 can also be substituted for 1009 AF if higher bond strength is required. The lower level of crosslinking in 4503 may also result in a greater tendency to cobweb when sprayed.

b) Pentalyn* H is a pentaerythritol ester based tackifier resin available with a ball and ring softening point of 94 to102 °C. If this is not available, then any pentaerythritol ester-based tackifier with a similar melting point should provide similar performance.

c) Pure n-hexane, free of cyclo-aliphatics, may not dissolve 1009 AF2 well. The best choice is a blend containing at least 10 percent cyclohexane

d) Irganox* 1520 is an antioxidant available from Ciba.

 

Related ProductsOther products Ashland offers that might be of interest.

Products
Applications
Product Types or Functions
Adhesives and sealants
Crosslinked and Non-crosslinked SBR Polymers

Additional InformationNeed more information about this product?

Hot SBR polymers, non-crosslinked

SBR 1006 -- This light-color, low-gel polymer is recommended for general-purpose pressure-sensitive adhesives or as laminating adhesives.

SBR 1011 -- Similar to ISP SBR 1006, 1011 is emulsified with rosin acid and has excellent green tack. It exhibits a good balance of adhesion, cohesion and tack. SBR 1011 is an excellent polymer for pressure-sensitive adhesives.

SBR 1011AC – Has a lower solution viscosity than 1011.

SBR 1011AE – Provides high tack, for pressure-sensitive tape adhesives and tire bead wire.

SBR 1012 -- A high molecular weight product featuring high viscosity and high cohesive strength. It is particularly useful as a binder for fibrous materials. Its high Mooney viscosity and solution viscosity lend increased cohesive strength when added to an adhesive/sealant mixture.

SBR 1013 -- This high bound styrene (43.5 percent) polymer is recommended for paper saturation or as a barrier coat prior to the application of pressure sensitive adhesive. It is useful in blending with other elastomers to increase cohesive strength to provide higher green strength. It yields a stiffer adhesive film.

Hot SBR polymers, crosslinked

SBR 1009 – An adhesive grade, for automobile sealants and caulking.

SBR 1009OC -- Partially crosslinked with divinylbenzene, it produces smooth, non-stringy adhesives that break clean when gunned or troweled in place. The cohesive strength of 1009OC can be improved by blending with SBR 1013. SBR 1009OC offers well-controlled expansion and sag resistance when used with other low molecular weight polymers.

SBR 1009AF -- Contains much higher crosslinking than 1009OC. The result is that it is a workhorse for misting spray adhesives.

SBR 4503 -- This polymer is polymerized to the same degree of crosslinking as SBR 1009OC, but it contains higher bound styrene (30.0 percent). It is emulsified with rosin-acid and offers excellent cohesive strength and green tack.

Crumb polymers, non-crosslinked

1006, 1012 and 1013 -- Crumb rubber is produced in free flowing form which eliminates the need for milling, cutting or grinding equipment. The crumb particles retain the porous nature of the coagulated rubber and can be dissolved in a solvent faster than milled or pelletized bale rubber.

Crumb polymers, crosslinked

1009, 1009AF and 4503 -- Crumb rubber is produced in free flowing form which eliminates the need for milling, cutting or grinding equipment. The crumb particles retain the porous nature of the coagulated rubber and can be dissolved in a solvent faster than milled or pelletized bale rubber.

Manufacturing

Ashland elastomers are manufactured to the highest standards at our plant in Port Neches, Texas, USA, where we continually turn out high volumes of products to meet customer demand. Significant investments in equipment, process improvements and staff have been made over the years, and we are committed to the continued production of quality SBR, using modern quality-control techniques. We have designed products specifically for the adhesives and sealant industry, efforts reflective of our commitment to the elastomer business.