Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – Plural – intermittent pressure applying
Patent
1977-08-25
1979-05-08
Lowe, James B.
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
Plural, intermittent pressure applying
51295, 264122, 264127, 264175, B29D 2700, B29D 714, B29B 104
Patent
active
041536614
ABSTRACT:
A polytetrafluoroethylene composite sheet having a tensile strength of at least one megapascal and comprising particulate material distributed in a matrix of interentangled polytetrafluoroethylene fibrils. The composite sheet is prepared by blending the particulate material with polytetrafluoroethylene aqueous dispersion in the presence of sufficient lubricant water to exceed the absorptive capacity of the solids yet maintain a putty-like consistency, subjecting the putty-like mass to intensive mixing at a temperature between 50.degree. C. and 100.degree. C. to cause initial fibrillation of the polytetrafluoroethylene particles, biaxially calendering the putty-like mass to cause additional fibrillation of the polytetrafluoroethylene particles while maintaining the same water content and drying the resultant sheet.
REFERENCES:
patent: 2782180 (1957-02-01), Weidman
patent: 3010950 (1961-11-01), Thomas
patent: 3242246 (1966-03-01), Stand
patent: 3281511 (1966-10-01), Goldsmith
patent: 3890417 (1975-06-01), Vallance
patent: 4049396 (1977-09-01), Hiles
Errede Louis A.
Jefson Gary B.
Langager Bruce A.
Ree Buren R.
Alexander Cruzan
Francis Richard
Lowe James B.
Minnesota Mining and Manufacturing Company
Sell Donald M.
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