Open-pore molded article based on polyvinyl acetals, and a proce

Details Open-pore molded article based on polyvinyl acetals, and a proce Open-pore molded article based on polyvinyl acetals, and a proce

1982-09-30

1984-02-07

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 70, 521 82, 521 87, 521134, 521141, C08J 930

Patent

active

044304471

ABSTRACT:
When polyvinyl alcohol and vinyl acetate/ethylene copolymers are acetalized in an acid aqueous medium in the presence of a wetting agent, an open-pore solid foam is formed, if the reaction mixture contains gas bubbles. These gas bubbles are produced, in particular, by stirring in air. The molded articles obtained are porous, and the pores are uniformly distributed. The dried molded article absorbs many times its weight of water. It is employed as a sponge for household use and in industry.

REFERENCES:
patent: 2609347 (1952-09-01), Wilson
patent: 2664367 (1953-12-01), Wilson
patent: 4098728 (1978-07-01), Rosenblatt
patent: 4246357 (1981-01-01), Hobes et al.

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