Borate solution soluble polyvinyl alcohol films

Details Borate solution soluble polyvinyl alcohol films Borate solution soluble polyvinyl alcohol films

C - Chemistry, Metallurgy

11

D

134/4.2

C11D 17/04 (2006.01)

Patent

CA 1240231

- 1 - Abstract Conventional polyvinyl alcohol envelopes will not readily dissolve in wash water which has a significant borate concentration and a pH frequently encountered in wash liquors. Herein, such films are rendered sufficient- ly soluble in such solutions. In the preferred embodiment this is done by utilizing a polyvinyl alcohol film having an acid having an acid dissociation constant of 10-9M or larger or a polyvinyl alcohol film containing mixtures thereof with a polyvinyl alcohol having a number average molecular weight below about 50,000.

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