Paper making and fiber liberation – Processes and products – Including solid non-waterlaid preform
Patent
1973-08-16
1976-06-01
Van Balen, William J.
Paper making and fiber liberation
Processes and products
Including solid non-waterlaid preform
162108, 428256, 428421, B32B 1502
Patent
active
039606511
ABSTRACT:
An air-pervious sheet predominantly of polytetrafluoroethylene, the sheet being reinforced by being fused to a liquid-pervious reinforcing material layer which is capable of retaining its original form even when heated to a temperature of 270.degree. to 280.degree. C. The sheet preferably consists of a polytetrafluoroethylene fibrous powder having an average fiber length of 100 to 5,000 microns, an average shape factor of not less than 10, and an anisotropic expansion factor of 1.30 to 7.00 adhered by means of molten polytetrafluoroethylene having an average particle diameter of 0.05 to 0.5 microns to a liquid-pervious reinforcing material layer which is capable of retaining its original form even when heated to a temperature of 270.degree. C. to 380.degree. C.
REFERENCES:
patent: 2710991 (1955-06-01), Squires
patent: 2772444 (1956-12-01), Burrows et al.
patent: 2936301 (1960-05-01), Thomas et al.
patent: 3003912 (1961-10-01), Harford
patent: 3015604 (1962-01-01), Hochberg
patent: 3186897 (1965-06-01), Hochberg
patent: 3528879 (1970-09-01), Kometani et al.
Koizumi Shun
Kometani Yutaka
Kubota Kazuo
Nawazima Takeaki
Daikin Kogyo Co. Ltd.
Epstein Henry F.
Van Balen William J.
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