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Powdered Nitrile rubbers because of their polarity,
act as plasticizers for many polymeric systems like PVC, Phenolics
etc. An improved grade of pre-crosslinked Nitrile Elastomer has
been developed, the handling of which is better due to easy flow.
This Nitrile Elastomer (rubber) with 38% Acrylonitrile content has
excellent flow characteristics due to its partition agent - Calcium
Carbonate. This new grade, when blended as modifier in Phenolic
based brakeliners allows faster braking without creating loud sound.
It would therefore help to enhance the performance of brake liners
and increase the comfort level for the driver as well as passengers
by eliminating the screeching sound while applying sudden brakes.
This new grade from Bayer Chemical is called Baymod® N VP KA
8641 and is similar to Baymod® N XL 38.20, a product which has
already set a new benchmark in powdered nitrile rubbers. In the
new grade Calcium Carbonate has replaced talc as a partition agent.
Baymod® N VP KA 8641 increases the abrasion coefficients so
that activating the brake has an immediate effect even at low temperatures.
There is no delay while the brake linings heat up. The new modifier
increases both the flexibility of friction and brake linings and
resistance to oils and automotive fuels, while also improving wear
properties. A particular advantage lies in the reduction of braking
noise. Baymod® N VP KA 8641 is used to bind fibers, fillers
and phenol formaldehyde resins. Production of these types of resin
mixtures usually involves mixing the solid components in a high-speed
mixer. The very small particle size of the new modifier enables
the rubber to be optimally dispersed even without the use of solvent.
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