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Excerpt From U.S. Patent No. 4,744,857 Granted on May 17, 1988
"Method for Modifying Fluoropolymer Fibers"
Kevin G. Nelson
Acton Technologies, Inc.
Pittston, PA 18640
ACLON® (HYDROPHILIC PTFE WHISKER)
"Composites of etched and unetched floc in polyurethane were made as follows:
Two batches of a rubbery polyurethane were made with chopped Teflon® fiber as a filler; one batch was made from the etched floc and one from unetched floc. Ten grams of floc were blended into 30 grams of diisocyanate, 60 grams of a poly diol, 20 grams of a triol and a trace of basic catalyst. The polymerization was carried out by heating to 60° C.
The Shore hardness of the composite containing unetched PTFE floc was 20 as compared to 60 for the composite with the etched PTFE. The increase in hardness illustrates the fact that the bond between the polyurethane matrix and the etched floc fibers was much stronger than was the case for the unetched floc, probably because the hydrophilic sites of the chopped fiber interact with the functional groups of the matrix polymer sufficiently to provide enhanced toughness, durability and frictional coefficient."
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