Borate solution soluble polyvinyl alcohol films

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

1986-11-26

1989-05-09

Willis, Prince E.

Compositions

Electrolytes for electrical devices

2065247, 25217423, 252 92, 252174, 2523635, 524 58, 524321, 525 56, C11D 1700, C11D 1704

Patent

active

048287440

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 sufficiently soluble in such solutions. In the preferred embodiment this is done by utilizing a polyvinyl alcohol film wherein at least a portion of the polyvinyl alcohol has a number average molecular weight below about 50,000, or a polyvinyl alcohol film containing a polyhydroxy compound having a binding constant with borate of at least about 800M.sup.-2, or utilizing a polyvinyl alcohol film having an acid having an acid dissociation constant of 10.sup.-9 M or larger; or a polyvinyl alcohol film containing mixtures thereof.

REFERENCES:
patent: 3148166 (1964-09-01), Suzumura et al.
patent: 3220991 (1965-11-01), Martins
patent: 3366592 (1968-01-01), Beeman
patent: 3413229 (1968-11-01), Bianco et al.
patent: 3632786 (1972-01-01), Nickerson
patent: 3892905 (1975-07-01), Albert
patent: 4119604 (1978-10-01), Nysong
patent: 4176079 (1979-11-01), Guerry et al.
patent: 4323492 (1982-04-01), Zimmermann et al.

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