DPR-35        DPR-40        DPR-75        DPR-400

 
 

Liquid Natural Rubber

 

 

Rubber Compounding

Industries Served      
 
 
 
Specialty Guides
 

 

 

DPRŽ Liquid Natural Rubber

DPR Industries markets liquid natural rubber products for use in rubber compounding and tire manufacturing.

DPRŽ is particularly useful as a general rubber compounding ingredient because it is natural rubber-based and can be reacted over the entire cure spectrum of natural rubber. It is employed by the grinding wheel and friction product industries for the same reasons. DPR has an affinity to wet large amounts of dry ingredients and can be cured to a very hard matrix. These attributes are ideally suited for components such as grinding wheels and brake linings that must be processed with a high percentage of dry ingredients and ultimately fashioned into very hard products.

DPRŽ can be used as reactive processing aids and as reactive vehicles for rubber chemicals that must be dustless, pre-dispersed and/or pre-measured. The benefit is the liquid rubber is easy to process and becomes non-fugitive once the rubber article is cured.

The tire industry takes advantage of these inherent characteristics in two particular components of tire construction. The first is in the bead insulation/apex area where very stiff compounds are desired. One way to achieve this is to use a highly loaded carbon black compound with DPR as a reactive plasticizer so that processability can be achieved without sacrificing permanence of the compound once it is cured. Likewise, “skim-coat” compounds may require several Banbury passes before they are soft enough for application. Compound adhesion is critical and large amounts of plasticizer must be avoided. DPR can be used because of its reactivity. Once cured, it will not migrate over time as typical oils do.
 

DPRŽ based sealants make an important contribution to the construction, insulated glass, and sound damping markets. These compounds bring the permanence of butyl rubber to the end user in a single-component, easy to use tape or pre-shaped profile. In sound damping areas where application of solids is restricted, DPRŽ can be formulated for application as multi-component thermosets.
 

Typical Properties
Liquid Polymers
Polymer Structure
Unsaturation, mole %
Color
Glass Transistion Temp., °C
Viscosity, cps @ Temperature, °C
Flash point, °C
Avg.Molecular Weight
Volatiles, %
DPRŽ 35
natural polyisoprene
98
dark brown
-65
35,000 @ 38
240
30000
0.46
DPRŽ 40
natural polyisoprene
98
dark brown
-65
40,000 @ 38
246
32000
0.25
DPRŽ 75
natural polyisoprene
98
dark brown
-65
75,000 @ 38
255
40000
0.22
DPRŽ 400
natural polyisoprene
98
dark brown
-65
400,000 @ 38
271
60000
0.16
             
 
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