PVOH-based coating solutions
AssigneeExxonMobil Oil Corporation
InventorRobert E. Touhsaent
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Abstract
An improved PVOH-based coating solution for application to a polymeric substrate. The coating solution includes poly(vinyl alcohol), a formaldehyde-containing crosslinking agent and a crosslinking-promoting acid catalyst which lowers the pH of the solution to about 3.5 or less and, preferably, to about 3 or less. The coating solution exhibits improved viscosity stability, particularly with the addition of a second acid catalyst. The coating solution also provides improved crosslinking and oxygen barrier characteristics upon drying.
Claims11
A polymeric film structure having an enhanced oxygen barrier produced by the process comprising:
- coating at least one side of a polymeric substrate adapted for receipt of an oxygen barrier with a solution of poly(vinyl alcohol), formaldehyde-containing crosslinking agent and crosslinking-promoting acid catalyst, said solution having a pH of about 3.5 or less, and
- wherein said acid catalyst is selected from the group consisting of phosphoric acid nitric acid and hydrochloric acid.
A method of producing a film structure having an enhanced oxygen barrier layer adhered thereto, comprising:
- coating at least one side of a polymeric substrate adapted for receipt of an oxygen barrier with a solution of poly (vinyl alcohol), formaldehyde-containing crosslinking agent and crosslinking-promoting acid catalyst, said solution having a pH of about 3.5 or less and
- wherein said acid catalyst is selected from the group consisting of phosphoric acid, nitric acid and hydrochloric acid.
Dependencies are inferred from the claim text.