Shaping and stretching aqueous formic acid solutions of polypyrr

Details Shaping and stretching aqueous formic acid solutions of polypyrr Shaping and stretching aqueous formic acid solutions of polypyrr

1977-06-08

1980-01-22

Tillman, Murray

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

260 292N, 264203, 2642106, 264178F, 264205, 528326, 264212, 2642893, 2642884, C08G 6924, D01D 512

Patent

active

041850637

ABSTRACT:
A method of preparing shaped polypyrrolidone articles having a high degree of tensile strength comprising forming said articles from solutions of polypyrrolidone in hydrous formic acid and drawing said articles while impregnated with said hydrous formic acid. The invention also includes the step of enhancing the tenacity of shaped polypyrrolidone articles by impregnation thereof with hydrous formic acid and drawing said impregnated articles.

REFERENCES:
patent: 2360406 (1944-10-01), Dreyfus et al.
patent: 2611929 (1952-09-01), Hoxie
patent: 2711398 (1955-06-01), Barnes et al.
patent: 2980641 (1961-04-01), Cox
patent: 3060141 (1962-10-01), Black
patent: 3060153 (1962-10-01), Follett
patent: 3269970 (1966-08-01), Epstein et al.
patent: 3324061 (1967-06-01), Tanquary et al.

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