Acetalized polyvinyl alcohol barrier coatings
AssigneeSun Chemical Corporation
InventorSafraz Khan
Life of this patent
Estimating the term…
Abstract
An in situ method of preparing modified polyvinyl acetals is described with the aim of improving the alcohol tolerance while retaining barrier properties of the base polymer.
Claims20
An in situ method for preparing a resin solution comprising:
- (a) providing a solution comprising polyvinyl alcohol homopolymer or copolymer with ethylene groups, alcohol, and a C1-C3 aldehyde in order to achieve an acetalization of under 25 mol %;
- and
- (b) adjusting solids content of the solution to about 20 to about 35 wt %;
- wherein, said method does not comprise any step selected from the group consisting of:
- an isolation step, a washing step and a precipitation step, and the alcohol is adjusted to be at least 40 wt % and up to 60 wt %.
A solution comprising a non-isolated, non-washed, and non-precipitated polyvinyl acetal resin comprised of acetalized polyvinyl alcohol polymer, said resin having a saponification degree of at least 90% and a degree of acetalization of less than 25 mol %, wherein the water content of the solution is less than 40 wt %.
An ink or coating composition comprising a solution comprising a non-isolated, non-washed, and non-precipitated polyvinyl acetal resin comprised of acetalized polyvinyl alcohol polymer, said resin having a saponification degree of at least 90% and a degree of acetalization of less than 25 mol %, and the water content of the solution is less than 40 wt %.
An ink or coating composition comprising a solution comprising a non-isolated, non-washed, and non-precipitated polyvinyl acetal resin comprised of acetalized polyvinyl alcohol polymer, said resin having a saponification degree of at least 90% and a degree of acetalization of less than 25 mol %, wherein the water content is less than 50 wt %.
An ink or coating composition comprising a solution comprising more than 40 wt % lower alcohol and a non-isolated, non-washed, and non-precipitated polyvinyl acetal resin comprised of acetalized polyvinyl alcohol polymer, said resin having a saponification degree of at least 90% and a degree of acetalization of less than 25 mol %.
The ink or coating composition of claim, 13, comprising more than 50 wt % lower alcohol.
Dependencies are inferred from the claim text.