Title: Process for manufacturing ultrathin polymer membranes and products derived therefrom

Abstract: Unsupported ultrathin polymer film is made in bulk form by floating the film on a bath, transferring the floating film to a release substrate, drying the resulting film/substrate composite, separating the film from the substrate, and retrieving the unsupported film, e.g. in the form of a convoluted roll provided with anti-blocking agent in between the convolutions. The bulk product can be made into thermal insulating material, flake-like weather modifying agents, etc.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Larson, Roy E. (St. Paul, MN, US)
Forester, Jr., Ralph H. (Minneapolis, MN, US)

Application Number: 455059
Filing Date: 1974-03-27
Publication_date: 1976-01-20
Assignee: North Star Research Institute (Minneapolis, MN)
Primary Class(es): 156/246 55/528, 156/247, 156/249, 264/41, 264/130, 264/212, 264/298, 428/304.4
Other Classes:
US Patent Ref:

3073733	Jan, 1963	Mitchell	161/164.
3551244	Dec, 1970	Forester et al.	264/298.
3650880	Mar, 1972	Tieniber	156/246.
3687772	Aug, 1972	Klenk et al.	156/246.
3810814	May, 1974	Herrick et al.	161/159.
3843436	Oct, 1974	Yanagida et al.	156/246.

Other Refs:
Primary Examiner: Van Balen, William J.
Assistant Examiner:
Attorney: Meshbesher; Thomas M.