Process for the manufacture of films and coatings containing pol

Details Process for the manufacture of films and coatings containing pol Process for the manufacture of films and coatings containing pol

1976-12-16

1978-08-29

Lusignan, Michael R.

Coating processes

With post-treatment of coating or coating material

Heating or drying

260 4251, 427391, 526 10, C08F 4504

Patent

active

041104943

ABSTRACT:
Polyvinyl alcohol containing films and coatings having a reduced water solubility are prepared from polyvinyl alcohol having an ester number of at most 200 mg of KOH/g. This polyvinyl alcohol being readily soluble in water is submitted in aqueous phase to an after saponification with alkali metal or alkaline earth metal hydroxide rendering it insoluble at elevated temperature. The alkali or alkaline earth metal ions then are precipitated in the form of compounds difficultly soluble in water by additions of substances containing corresponding anions. The precipitate remains as inert filler in the suspension of polyvinyl alcohol thus prepared. The suspension is applied in form of films or coatings and dried.

REFERENCES:
patent: 3087920 (1963-04-01), Suzumara et al.
patent: 3829402 (1974-08-01), Zimmerman et al.

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