D - Textiles – Paper – 01 – D
Patent
D - Textiles, Paper
01
D
18/15
D01D 5/247 (2006.01) B01D 39/08 (2006.01) B01D 67/00 (2006.01) B01D 69/08 (2006.01) B01D 71/26 (2006.01) D01D 5/42 (2006.01) D01F 11/04 (2006.01)
Patent
CA 1315928
ABSTRACT Disclosed is a process for preparing porous fibers, filaments or strands of an olefin polymer having side-groups reactable with a reagent at a temperature below that at which thermal stess-relaxation of the oriented molecules is substantially encountered, said process comprising the steps of (a) treating the orientable olefin polymer with a chemical reagent which reacts with said reactive groups, thereby swelling the polymer while keeping the temperature below the thermal stress-relaxation temperature, (b) applying a shearing or crushing force to the so-swelled polymer so as to cause fibrillation of the polymer into separable parts, characterized in that said polymer is a polymer oriented at a temperature below that at which stess-relaxation is substantially encountered. The product of the present invention can be used in preparing woven materials or wrapping on a filter mandrel. The products provide benefits not found in ordinary melt-spun blown fiber because of the presence of fibrils along the surfaces. 32,486-F
516347
Vaughn Walter L.
Wing Milton S.
Smart & Biggar
The Dow Chemical Company
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