To suppress the generation of microbubbles owing to superior defoaming property and to prevent the occurrence of pattern defects in a formed water-soluble film by adding one or more kinds of specified water-soluble compds.
One or more kinds of water-soluble compds. selected from among polyhydric alcohol, monoalkyl ether of polyhydric alcohol, alkylene oxide adduct of monoalkyl ether of polyhydric alcohol, hydroxycarboxylic acid and alkyl ester of hydroxycarboxylic acid are added by 0.00001-30 pts.wt., especially 0.001-10 pts.wt. based on 100 pts.wt. water. In order to improve film forming property, various water-soluble high molecular compds. as well as an acetylene alcohol compd. are preferably added. The high molecular compds. include PVA, its ether deriv., polyacrylic acid and its ester deriv.
WATANABE SATOSHI
ISHIHARA TOSHINOBU
OKAZAKI SATOSHI
UMEMURA MITSUO
