Stock material or miscellaneous articles – Ink jet stock for printing – Particles present in ink receptive layer
Reexamination Certificate
2002-09-30
2003-12-09
Shosho, Callie (Department: 1714)
Stock material or miscellaneous articles
Ink jet stock for printing
Particles present in ink receptive layer
C428S032290, C428S032370, C428S032380, C524S492000, C524S493000, C524S503000
Reexamination Certificate
active
06660348
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an aqueous ink jet coating composition that comprises a blend of silicas, a blend of super and/or fully and partially hydrolyzed polyvinyl alcohols and a cationic resin. The present invention further relates to an ink jet recording material prepared from such a composition that demonstrates a balance of properties including improved imaging performance and good water resistance.
BACKGROUND ART
Performance requirements for ink jet recording papers are quite stringent. Such papers, for example, are required to be fast drying while allowing for ink jet printing with good image density and good color fidelity. In addition, these papers must be capable of being economically produced.
Various attempts have been made in the prior art to achieve an ink jet recording paper which satisfies each of these performance requirements. For example, U.S. Pat. No. 4,780,356 discloses a recording sheet comprising a sheet of paper and porous particles provided on the paper surface. The porous particles have an average pore size of from 10 to 5000 Å, a pore volume of from 0.05 to 3.0 cc/g and an average particle size of from 0.1 to 50 &mgr;m. Such particles may be coated on a paper surface by means of a binder such as polyvinyl alcohol.
U.S. Pat. No. 4,830,911 discloses a recording sheet for ink jet printers capable of forming water-resistant images by the use of an aqueous ink containing a water-soluble dye. The recording sheet is coated with a coating material containing at least one water-soluble cationic polymer, synthesized silica and polyvinyl alcohol.
U.S. Pat. No. 4,944,988 discloses an ink jet recording sheet having a coating formed on a surface thereof that comprises a pigment such as silica and various water-soluble cationic polymeric substances mixed into a water-insoluble or water-soluble resinous binder.
U.S. Pat. No. 5,013,603 discloses an ink jet recording element which comprises a paper substrate and a layer of a filler coated on the surface of the substrate. The filler comprises amorphous silica having a pore volume of more than 1.30 cc/g, and water-soluble binders.
U.S. Pat. No.5,165,973 discloses an ink jet recording sheet which comprises an ink receptive layer of a coating material comprising both an ultra-fine anhydrous silica and a cationic polymer.
U.S. Pat. No. 5,213,873 discloses an aqueous ink jet recording sheet comprising: a substrate sheet and an aqueous ink image-receiving layer comprising (a) fine silica particles, (b) a binder consisting of at least one member selected from the group consisting of polyvinyl alcohol resins and silanol-modified polyvinyl alcohol resins, and (c) a cationic polymeric material.
U.S. Pat. No. 5,320,897 discloses an ink jet recording paper comprising a paper substrate which has been calendered and an ink receptive image-receiving layer thereon. The image receiving layer is formed by coating or saturating the substrate with an aqueous composition comprising a porous pigment such as silica, water soluble binder and/or cationic resin.
U.S. Pat. No. 5,541,002 discloses a printing paper comprising a paper substrate and a coating layer formed on at least one side of the substrate. The coating layer is formed from a coating composition comprising a white pigment such as amorphous silica and a water-soluble resin such as fully saponified polyvinyl alcohol and partially saponified polyvinyl alcohol.
U.S. Pat. No. 5,660,622 discloses a coating composition for ink jet recording sheets which includes a combination of hydrated amorphous synthetic silica, a synthetic binder, a cationic agent, a leveling-flow modifier, a dispersing agent, an optical brightener, remainder water.
U.S. Pat. No.5,747,146 discloses a printing medium comprising a base material and an ink-receiving layer which comprises inorganic fine particles such as silica and a resin such as polyvinyl alcohol or modified polyvinyl alcohol.
U.S. Pat. No. 5,753,082 discloses a coating composition for ink jet recording which comprises a pigment such a synthetic silica, a water-base binder and a water-soluble cationic polymer.
U.S. Pat. No. 5,804,293 discloses a coating composition for recording paper that comprises (a) composite particulate amorphous precipitated silica, (b) aqueous solvent, and (c) water-soluble organic polymeric binder dissolved in the aqueous solvent.
U.S. Pat. No. 5,856,001 discloses an ink jet recording medium comprising a substrate and an ink receiving layer formed on the substrate. The ink receiving layer comprises porous xerogel pigment particles such as amorphous silica, a binder such as polyvinyl alcohol and cationic polymer, and further contains lubricants.
In addition, ink jet recording papers prepared from coating compositions made up of a blend of silicas and a super hydrolyzed polyvinyl alcohol binder have been sold by Kanzaki Specialty Papers Inc. under the trade designation KS-JET PREMIUM® ink jet recording papers.
Although some of these ink jet recording papers perform satisfactorily in terms of functional performance requirements, improvement in the area of imaging performance (e.g., intercolor bleeding and optical density) is still needed.
A need therefore exists for an ink jet recording material that demonstrates a balance of properties including improved imaging performance.
It is therefore an object of the present invention to provide such an ink jet recording material.
It is a more specific object of the present invention to provide an ink jet coating composition that allows for improved imaging performance.
It is a further object to provide an ink jet recording material prepared from such a coating composition that demonstrates a balance of properties including improved imaging performance and good water resistance.
SUMMARY OF THE INVENTION
The present invention therefore provides an aqueous ink jet coating composition that demonstrates a balance of properties including improved imaging performance and good water resistance and that comprises a blend of silica particles, a blend of super and/or fully and partially hydrolyzed polyvinyl alcohols, and a cationic resin.
Preferably, the inventive coating composition comprises:
a. from about 40 to about 95 percent by weight (% by wt.) (dry basis) (based on the total weight (dry basis) of pigment composition and water-soluble binder) of a pigment composition comprising a blend of silica particles,
wherein a first quantity of silica particles has a pore volume ranging from about 1.4 to about 3.0 cubic centimeters per gram (cc/g) and an average particle size ranging from about 1 to about 17 microns (&mgr;), and wherein a second quantity of silica particles has a pore volume ranging from about 0.6 to about 1.3 cc/g and an average particle size ranging from about 1 to about 17&mgr;;
b. from about 60 to about 5% by wt. (dry basis) (based on the total weight (dry basis) of pigment composition and water-soluble binder) of a water-soluble binder comprising a blend of super and/or fully and partially hydrolyzed polyvinyl alcohols; and
c. from about 1 to about 30% by wt. (dry basis) (based on the total weight (dry basis) of the coating composition) of a cationic resin.
The present invention further provides an ink jet recording material having an ink receptive layer on a substrate, said ink receptive layer being the aqueous ink jet coating composition identified above.
The foregoing and other features and advantages of the present invention will become more apparent from the following description.
BEST MODE FOR CARRYING OUT THE INVENTION
An ink jet recording material according to the present invention is characterized by having an ink receptive layer on a substrate, said ink receptive layer being an aqueous composition containing a pigment composition, a water-soluble binder and a cationic resin as its main components.
As a result of various studies concerning the ink receptive layer (aqueous composition), the present inventors have found that recorded images that have or demonstrate high image densities, low intercolor bleeding and good water resistance are produ
Cuch Simon R.
Stevens, Jr. George R.
Waite Brian R.
Bonzagni, Esq. Mary R.
Holland & Bonzagni, P.C.
Kanzaki Specialty Papers, Inc.
Shosho Callie
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