Hydrophobic crosslinkable acetoacetylated lactam/vinyl alcohol copolymers
View Patent ↗This invention relates to lactam/vinyl alcohol copolymers, and more specifically, to hydrophobic cross-linkable acetoacetylated lactam/vinyl alcohol copolymers suitable for use in a variety of applications including printing, inks, membranes, coatings, adhesives, oil treatment chemicals (such as gas and kinetic hydrate inhibitors), and fiber/textile treatments.
1. An inkjet recording medium comprising a support and the hydrophobic crosslinkable acetoacetylated lactam/vinyl alcohol copolymer wherein the copolymer is formed by:
a) polymerizing vinylpyrrolidone and vinyl acetate monomers to produce a poly(vinylpyrrolidone/vinyl acetate) copolymer, wherein the resulting poly(vinylpyrrolidone/vinyl acetate) copolymer is between 30% and 70% vinylpyrrolidone monomers by weight and between 30% and 70% vinyl acetate monomers by weight;
b) at least partially hydrolyzing the vinyl acetate of the poly(vinylpyrrolidone/vinyl acetate) copolymer to produce a poly(vinylpyrrolidone/vinyl alcohol) copolymer optionally comprising vinyl acetate depending on degree of hydrolyzation; and
c) in an acetoacetylation step, at least partially acetoacetylating the vinyl alcohol of the poly(vinylpyrrolidone/vinyl alcohol) copolymer with a diketene to obtain the hydrophobic, crosslinkable acetoacetylated lactam/vinyl alcohol copolymer.
2. The inkjet recording medium of claim 1 which has enhanced dye fade stability.
3. The inkjet recording medium of claim 1 wherein the poly(vinylpyrrolidone/vinyl acetate) copolymer comprises from about 50 to 70% by weight vinylpyrrolidone.
4. The inkjet recording medium of claim 3 wherein the poly(vinylpyrrolidone/vinyl acetate) copolymer is 50% by weight vinylpyrrolidone and 50% by weight vinyl acetate.
5. The inkjet recording medium of claim 1 wherein the poly(vinylpyrrolidone/vinyl acetate) copolymer is 70% by weight vinylpyrrolidone and 30% by weight vinyl acetate.