Water-resistant sealing layer for sealing microcells of electro-optic devices
AssigneeE Ink Corporation
InventorsYuriy Borisovich Matus, Chandra Bikram Kc, Saemi Oh Poelma, Haiyan Gu, Donald A. Schultz, Abraham Berhane
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Abstract
The present invention is directed to a sealing layer that comprises a combination of polyurethane and poly(vinyl alcohol), the poly(vinyl alcohol) containing an acetoacetate functional group in its molecular structure. The sealing layer is formed from an aqueous sealing composition and shows water resistance and good barrier properties to non-polar fluids. The sealing layer can be used to seal microcells of electro-optic displays.
Claims21
A water-resistant sealing layer comprising:
- a. from 40 to 95 weight percent of a poly(vinyl alcohol) by weight of the sealing layer excluding solvents, the poly(vinyl alcohol) containing an acetoacetate functional group in its molecular structure, the poly(vinyl alcohol) having a degree of hydrolysis of from 90 to 99 percent;
- and
- b. from 5 to 60 weight percent of a polyurethane by weight of the sealing layer excluding solvents.
A water-resistant sealing layer comprising:
- a. from 40 to 95 weight percent of a poly(vinyl alcohol) by weight of the sealing layer excluding solvents, the poly(vinyl alcohol) containing an acetoacetate functional group in its molecular structure;
- and
- b. from 5 to 60 weight percent of a polyurethane by weight of the sealing layer excluding solvents;
- wherein the sealing layer is formed from an aqueous sealing composition, and wherein the aqueous sealing composition has a pot life longer than 1 day.
A water-resistant sealing layer comprising:
- a. from 40 to 95 weight percent of a poly(vinyl alcohol) by weight of the sealing layer excluding solvents, the poly(vinyl alcohol) containing an acetoacetate functional group in its molecular structure;
- and
- b. from 5 to 60 weight percent of a polyurethane by weight of the sealing layer excluding solvents, wherein the polyurethane has Peak Melting Temperature of 115° C. and higher and Index of Crystallinity of 8% and higher.
Dependencies are inferred from the claim text.