Forming clear gel and transparent film by reacting alumina hydra

Details Forming clear gel and transparent film by reacting alumina hydra Forming clear gel and transparent film by reacting alumina hydra

1987-07-27

1988-11-15

Lieberman, Allan M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

524430, 524437, 524557, C08K 322, C08L 2904

Patent

active

047850493

ABSTRACT:
A stable gel is formed by reacting alumina hydrate sol and a vinyl alcohol-vinyl acetate copolymer in an aqueous solution having pH less than about 7 to form a polymeric sol and then transforming the sol to a gel. The copolymer preferably comprises polyvinyl acetate that is about 85-99% hydrolyzed. The gel is drawn into a thin layer and water is removed to form a thin, substantially crack-free film. The film makes a stable, generally transparent insulating material.

REFERENCES:
patent: 3417028 (1968-12-01), Montgomery et al.
patent: 3839307 (1974-10-01), Schmifg
patent: 3993590 (1976-11-01), Andre et al.
patent: 4104208 (1978-08-01), Kido et al.

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