Friction material comprising aramid
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United States of America Patent
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Sep 15, 2020
Grant Date -
Jul 11, 2019
app pub date -
Aug 22, 2017
filing date -
Aug 24, 2016
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Abstract
A friction paper including filler, para-aramid pulp, and resin, characterised in that the para-aramid pulp includes 0.1 to 10 wt. % of polyvinyl pyrrolidone (PVP), the paper having a grammage in the range of 100 to 800 g/m2. It has been found that the use of a PVP-containing para-aramid pulp leads to improved friction performance as compared to the use of para-aramid pulp not containing PVP. Effects obtained include improved friction properties, improved strength properties, and improved filler retention.
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