Method for modifying fluoropolymer fibers

Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step

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156629, 156668, 252 795, 427307, 428236, 428359, 428364, B44C 122, B29C 3700

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047448571

ABSTRACT:
The present invention provides etched fluoropolymer fibers and a method for etching fluoropolymer fibers, which are then capable of being boned either together or with other materials to form composite materials. In particle, the present invention relates to a method for chemically etching chopped, natural polytetrafluoroethylene fiber by immersing the fibers in an alkai metal polyaryl hydrocarbon etching solution with increased temperatures ranging from 50.degree. C. to 110.degree. C. and high shearing agitation until at least 98% of the fibers are sufficiently hydrophilic to sink when placed in water. This produces etched fiber material which may then be bonded together to form composite fluoropolymer products.

REFERENCES:
patent: 2789063 (1957-10-01), Purvis et al.
patent: 2809130 (1957-10-01), Rappaport
patent: 3471207 (1969-10-01), McCloskey
patent: 3516239 (1970-06-01), Fukuda et al.
"Sodium Naphthalene, I. A New Method for the Preparation of Additional Compounds of Alkali Metals and Polycyclic Aromatic Hydrocarbons," by Scott et al, 58.
"Fluoropolymer Surface Studies" by Dwight and Riggs, 47 J. Colloid and Interface Science, 650-660 (1974).

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