Open-cell shaped article made of acetalized polyvinyl alcohol an

Details Open-cell shaped article made of acetalized polyvinyl alcohol an Open-cell shaped article made of acetalized polyvinyl alcohol an

1980-11-26

1981-10-20

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 65, 521107, 521141, C08V 930

Patent

active

042962102

ABSTRACT:
The acetalization of polyvinyl alcohol in an acidic aqueous medium in the presence of a wetting agent yields an open-cell, solid foam when the reaction medium contains gas bubbles which are preferably produced by stirring air into the reaction mixture. By carrying out the acetalization in the presence of a nucleic acid a porous shaped article is obtained in which the cells are uniformly distributed. The dried shaped article absorbs a multiple of its weight of water. It can be used for household and industrial purposes.

REFERENCES:
patent: 2609347 (1952-09-01), Wilson
patent: 2653917 (1953-09-01), Hammon
patent: 2846407 (1958-08-01), Wilson
patent: 3492250 (1970-01-01), Deyrup

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