Patent ID: 7476701

Claim:
An adhesive composition comprising an aqueous solution of (i) a polyvinyl alcohol polymer with a degree of polymerization of about 1,600 to about 2,600, a number average molecular weight of about 70,000 to about 116,000, and being about 95 mole % to about 99.9 mole % hydrolyzed; (ii) a neutralized amine corrosion inhibitor present in an amount such that about 0.25 wt % to about 1 wt % of the solids content of the adhesive formulation is derived from the neutralized amine corrosion inhibitor; (iii) about 0.2 wt % to about 1.7 wt % of fumaric acid; and (iv) about 4.0 wt % to about 7.0 wt % boric acid, based on the total weight of the polyvinyl alcohol polymer.