Transparent liquid absorbent materials for use as ink receptive layers
AssigneeMinnesota Mining and Manufacturing Company
InventorsMohammad Iqbal, Alan G. Miller, John J. Stofko, Jr.
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Abstract
Semi-interpenetrating polymeric networks comprising a blend of hydrophilic and hydrophobic polymers wherein at least one of the polymeric components is crosslinked after blending to form a continuous network throughout the bulk of the material, and through which the uncrosslinked polymeric components are intertwined in such a way as to form a macroscopically homogeneous composition. The integrity of such networks persists even after absorption of solvent. These materials can be used to form durable, non-tacky, ink-absorbent, transparent coatings for graphical materials.
Claims18
An ink-receptive transparent sheet comprising a transparent polymeric film bearing on at least one major surface thereof a layer comprising a semi-interpenetrating network comprising a cross-linked polymeric matrix component and an uncross-linked polymeric liquid-absorbent component, said layer having been formed by uniformly blending a solution of:
- (a) at least one polymeric matrix component comprising a cross-linkable polymer derived from .alpha., .beta.-ethylenically unsaturated monomers,
- (b) at least one polymeric liquid-absorbent component, and
- (c) polyfunctional aziridine as a crosslinking agent, applying the solution to the transparent sheet and drying and effecting cross-linking within the applied layer.
Dependencies are inferred from the claim text.