Abstract: Stainproofing properties are imparted to a cellulose fiber by 1) esterifying a part of hydroxyl groups of the cellulose fiber in a heterogeneous reaction system and 2) subjecting the partially esterified cellulose fiber to a stainproofing treatment with an aqueous solution or emulsion of a copolymer having repeating units derived from a fluroalkyl group-containing polymerizable compound and a compound represented by the general formula:CH.sub.2 .dbd.CR.sup.1 COO--(XO).sub.m --(YO).sub.n --R.sup.2( 1)wherein X is --CH(CH.sub.3)--CH.sub.2 -- or --CH.sub.2 --CH(CH.sub.3)--; Y is --CH.sub.2 CH.sub.2 --; R.sup.1 is a hydrogen atom or a methyl group; R.sup.2 is a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; and each of m and n is an integer of 0 to 50, provided that the total of m and n is an integer of 1 to 70.

Abstract: A method of producing a composition for coating fibrous sheet products includes adding a surface treatment agent in an aqueous emulsion or solution form to an aqueous suspension of a dispersed inorganic particulate material comprising kaolin to improve the coating composition, e.g., rheology, and the rotogravure printing process, e.g. runnability. The dispersing agent is polycarboxylate. The surface treatment agent is in a substantially free state, has a hydrophobic group, and is selected from the group consisting of: (i) a long chain fatty acid; (ii) a long chain fatty alcohol; or (iii) an anionic surfactant having a long chain hydrophobic group and a polar group. A hydrophilic adhesive is added to the dispersed aqueous suspension during or while the surface treatment agent is added to the dispersed aqueous suspension. This method is used to produce a coated and a printed coated cellulosic sheet member.

Abstract: An aqueous, curable, composition comprising (1) a pre-polymer of a styrene-butadiene copolymer and (2) TiO.sub.2 , the composition, when applied to a liner board substrate, forming a waterproof coating.

Abstract: A decorative laminate surface layer composition is prepared by selectively applying dissimilar thermoset or thermoplastic polymers to a decorative laminate facing sheet to achieve a brillant visual or pearlescent appearance.

Abstract: A decorative laminate surface layer composition is prepared by selectively applying dissimilar thermoset or thermoplastic polymers to a decorative laminate facing sheet to achieve a brillant visual or pearlescent appearance.

Abstract: A decorative laminate surface layer composition is prepared by selectively applying dissimilar thermoset or thermoplastic polymers to a decorative laminate facing sheet to achieve a brillant visual or pearlescent appearance.

Abstract: The toner image receiver sheet of the invention, which is useful for digital offset printing, comprises a resin-coated paper substrate on which is formed an image-receiving layer comprising an imino-functionalized polymer and a gelatin. In a process for making the receiver sheet, a composition, preferably an aqueous solution containing the imino-functionalized polymer and gelatin, is applied to a resin-coated surface of a paper substrate, thereby forming an image-receiving layer on the substrate. The image-receiving layer provides the receiver sheet with a glossy, non-tacky surface having excellent toner transfer and adhesion characteristics.

Abstract: Paper coating slips contain an emulsion copolymer, comprising overallfrom 0 to 60% by weight of a vinylaromatic,from 40 to 95% by weight of a C.sub.1 -C.sub.10 -alkyl (meth)acrylate,from 5 to 40% by weight of an alkenylnitrile,from 0 to 10% by weight of an ethylenically unsaturated acid andfrom 0 to 20% by weight of further monomersas a binder, wherein the emulsion copolymer is a mixture of at least two polymers or an emulsion copolymer comprising at least two stages, one polymer or one stage whose content in the emulsion copolymer is from 10 to 75% by weight containing at least 90% by weight of the total amount of alkenylnitrile (alkenylnitrile-rich polymer or stage).

Abstract: The inkjet recording sheet of the present invention comprises a cellulosic sheet support, e.g., paper, bearing on at least one surface thereof an inkjet coating comprising a co-binder system of water soluble and water insoluble binders which are cross-linked during the coating drying process for fixing the images printed with inkjet inks, and a combination of pigment components having a high absorption capacity for absorbing the vehicle of the inkjet inks.

Abstract: Aqueous dispersions containing a polyurethane built up froma) diisocyanates having 4 to 30 carbon atoms,b) diols, of whichb.1) from 10 to 100 mol %, based on the total amount of the diols (b), have a molecular weight of from 500 to 5000 and are built up fromb1.1) (C.sub.4 - to C.sub.30 -alkyl)succinic acid and/or (C.sub.4 - to C.sub.30 -alkenyl)succinic acid,b1.2) from 0 to 60 mol %, based on component (b1.1), of a dicarboxylic acid which is different from component (b1.1), andb1.3) a diol having a molecular weight of from 60 to 500 g/mol,b.2) from 0 to 90 mol %, based on the total amount of the diols (b), have a molecular weight of from 60 to 500 g/mol, andb.

Abstract: Sheets to be coated with water-based coating material, for example a primer and a low adhesion backsize, are supplied from a feeder (1), in end-to-end overlapping relationship, to a dual coater (3) in which the sheets are coated individually on both sides. A sheet inserter (2) is provided, upstream of the dual coater, to insert sheets from a second supply into the sheets from the feeder (1). The dual coated sheets are dried as individual sheets or as a pseudo-web of overlapped sheets. The sheets are then overlapped, unless previously overlapped, and the direction of overlap changed, if necessary, to provide the trailing edge of each sheet on top of the leading edge of each succeeding sheet. The overlapped sheets are conveyed through an adhesive transfer station (7) where stripes (236) of at least partially dried adhesive are coated onto the dual coated sheets from a transfer belt (71).

Abstract: The methods of forming a chemically adsorbed film by contacting a substrate with a solution mixture containing an alkoxysilane surface active agent, a non-aqueous solvent and a silanol-condensing catalyst to form a film covalently bonded to the substrate via siloxane bonds. These methods do not generate hydrochloric acid gas in forming the films and allow practical reaction rates.

Abstract: Methine dyes of the formula ##STR1## where K is a carbocyclic or heterocyclic radical,X is nitrogen or a radical of the formula C--Q.sup.1, andQ.sup.1, Q.sup.2 and Q.sup.3 are hydrogen, substituted or unsubstituted C.sub.1 -C.sub.6 -alkyl, C.sub.3 -C.sub.8 -cycloalkyl, substituted or unsubstituted phenyl, C.sub.1 -C.sub.6 -alkoxy, benzyloxy, substituted or unsubstituted phenoxy, C.sub.1 -C.sub.6 -alkylthio, halogen, cyano, formylamino or a radical of the formula R.sup.3, --CO--OR.sup.1, --CO--NHR.sup.1, --CO--NH--CO--R.sup.1, --CO--NH--CO--R.sup.3, --CO--NH--SO.sub.2 R.sup.3, --NH--CO--R.sup.1, --NH--CO--OR.sup.1, --NH--CO--NR.sup.1 R.sup.2, NH--CS--OR.sup.1, --NH--CS--NR.sup.1 R.sup.2, --NH--CO--R.sup.3, --NH--SO.sub.2 --R.sup.1, --NH--SO.sub.2 --R.sup.3 or --NH--SO.sub.2 --NR.sup.1 R.sup.2, wherein R.sup.1 and R.sup.2 are substituted or unsubstituted C.sub.1 -C.sub.13 -alkyl, C.sub.3 -C.sub.8 -cycloalkyl or substituted or unsubstituted phenyl, or else --NR.sup.1 R.sup.2 is amino, and R.sup.

Abstract: A printing paper, especially a newsprint base paper, comprising a base paper, suitably lightweight acid base paper, and a coating layer for improving surface strength of the coated paper and releasing-property when two sheets of the coated paper are stacked, which coating layer is formed on the base paper by using a coating-transcription system such as a gate-roll coating system, which coating layer comprises low-molecular anionic polyacrylamide in a coating weight of from 0.01 g/m.sup.2 to 0.2 g/m.sup.2, wherein the anionic polyacrylamide have a weight average molecular weight ranging from 10,000 to 150,000, thereby improving not only surface strength but also releasing-property in a printing paper, especially in a newsprint paper having a basis weight less than 46 g/m.sup.2.

Abstract: Process for the production of structurally strong papers (or paper-like materials) which have a terminable strength by treatment of paper in the pulp or of finished paper in the surface with 0.0001 to 50% by weight, preferably 0.01-25% by weight (based on the pulp), of a mixture of isocyanates which contain on average at least two isocyanate groups and of which at least 20% by weight (preferably at least 50%) are those in which the NCO groups are bonded via an organic radical which contains at least one ester and/or amide group in the main chain.

Abstract: A lining material for forming a tight barrier coating on a base material. The lining includes a thermoplastic polymer that does not cross-link in an aqueous dispersion. The thermoplastic polymer is 65%-85% of lining by dry matter weight. The lining also includes an additive including at least one particulate material having barrier-forming properties and in an aqueous dispersion. The additive is 15%-35% of the lining by dry matter weight. At least 95% of the particles of at least one particulate material fulfill the condition that the ratio between the largest and the smallest dimension of a particle of the particulate material is greater than 5:1.

Abstract: A substrate such as a woven or nonwoven fabric bound with a light-activated dye alone or in combination with additional conventional antimicrobial agents. The substrate is impregnated with a light-activated non-leachable dye having antimicrobial and/or antiviral characteristics which can be imparted to the substrate. The dye is bound by a cationic or anionic binder such as a water soluble polymer or carrageenan. Upon exposure to normal light, the dye generates singlet oxygen that kills microorganisms and viruses.

Abstract: A process for manufacturing a material from a greaseproof paper used as support. At least one face of the support is coated with water or at least one aqueous solution. The support thus becomes a pliable support, The surface of the pliable support is treated by depositing one or more pigmented layers on the surface. This treatment improves the qualities of metallization or of printing or of both of the paper, relative to uncoated greaseproof paper. The pliable support thus becomes a pliable coated support. The pliable coated support is then calendared.

Abstract: An aqueous coating composition having low VOC is provided. The invention provides excellent hardness and resistance properties in films formed from binders having glass transition temperatures below ambient temperature. The improvement in film properties comes from the binding of functionalized polyvinyl alcohol to a complementary functionalized latex binder. The low VOC compositions of this invention are useful for a variety of coatings including paints, stains, varnishes, mastics and adhesives.

Abstract: Casting paper of a desired surface texture or finish for use in the manufacture of artificial leather is produced by heating the polymer coating 1 of a polymer-coated paper 2 to a temperature sufficient to melt the polymer and then cooling the polymer coating from its molten state to a solid state as it passes through a nip between an embossing roll 3 having a surface configuration corresponding to said desired surface texture or finish and a backing roll 4, thereby to impart the surface configuration of the embossing roll to the polymer-coated paper. The polymer is preferably polyolefinic, for example poly (4-methyl-1-pentene) or a polypropylene/polyethylene blend. An anti-curl back-coat, for example of polyvinyl alcohol, can be applied after the embossing operation.

Abstract: The invention provides an improved method of coating mediumweight and heavyweight papers in a size press by applying a paper coating composition comprising a binder wherein the binder comprises a stable aqueous dispersion comprising a water insoluble component and a water soluble component such that the water insoluble component comprises coalescable polymer particles which have a T.sub.g less than 55.degree. C. and a majority of which have a particle size less than 1 micron; and the water soluble component comprises a water soluble polymer capable of inhibiting coalescence of said polymer particles, or a water soluble polymer and a component capable of inhibiting coalescence of said polymer particles; and wherein said water insoluble component comprises greater that 3% and less than 75% by weight of the binder solids and said water soluble component comprises greater than 25% and less than about 97% of said solids.

Abstract: A surface sizing composition is provided for nonwoven substrates comprising a hydrophobic waxy material and a surfactantless vinyl polymer or copolymer emulsion containing as the sole emulsifying agent an alkali soluble, acid containing copolymer.

Abstract: A process for manufacturing a coated paper for use in printing is characterized in that the coated paper for printing is produced by coating a color consisting mainly of pigment and a water-soluble binder made of starch or starch derivatives to the surface of a base paper, then drying and finishing it. Steam or an aqueous penetrant solution having a penetrating force of less than 50 seconds is sprayed or applied over the dry coated layer surface of the coated paper, prior to it being finished with a calender, for redistributing the water-soluble binder in the coated layer in order to correct its uneven distribution, which is the cause of printing mottle during the offset printing operation.

Abstract: An improved coated paperboard or plate stock useful for forming substantially rigid food containers such as plates, bowls, trays and the like and a process from producing the improved coated paperboard are provided. A base coat comprising a styrene acrylic latex and a pigment is applied directly to the paperboard, and a top coat comprising a styrene acrylic polymer latex and a pigment is applied directly to the base coat to form the coated plate stock. The improved coated plate stock is characterized by improved grease, oil and cut resistance, improved varnish gloss, enhanced smoothness, and improved printing quality.

Abstract: Binders for papercoating slips which permit uniform printability contain a polymer prepared by the seed procedure and comprisingfrom 1 to 49% by weight of a polymer seed A) having a glass transition temperature of from -80.degree. to +25.degree. C. and based on esters of acrylic acid or methacrylic acid, andfrom 51 to 99% by weight of ethylenically unsaturated monomers B), from 10 to 100% by weight of which monomers are butadiene,the polymer seed A being added before or during the polymerization of the ethylenically unsaturated monomers.

Abstract: The present invention is a method of fabricating a printing medium that is suitable for use with ink jet printing. The method includes preparing a polymeric dope solution. The polymeric dope solution is metered onto a substrate. A porous coating layer is formed on the substrate from the polymeric dope solution using a phase inversion technique. At least one component of an ink solution placed upon the porous coating layer is drawn into the porous coating layer to cause the ink solution to dry on the porous coating layer.

Abstract: An ink jet recording sheet comprising a support, at least one ink-receiving layer formed on the support, and a gloss-providing layer formed on the ink-receiving layer, said ink-receiving layer consisting essentially of a pigment and a binder, and said gloss-providing layer consisting essentially of a pigment and a synthetic polymer latex as a binder and having a glossy surface with a 75.degree. specular gloss of at least 25% as stipulated in JIS-Z8741, wherein at least 70 parts by weight in 100 parts by weight of the pigment in the gloss-providing layer are constituted by colloidal particles having an average particle size of at most 300 nm.

Abstract: The present invention relates to coating and printing methods for the deposition of aqueous compositions. The composition may be adapted to any method without the need to change its chemical content. Viscosity is determined and adjusted by raising and lowering the temperature. High gloss value, increased film integrity and enhanced mar resistance result.

Abstract: A method of coating paper with a paper coating composition having a solids concentration of at least 45% by weight, consisting essentially of an aqueous cationic dispersion of a particulate calcium carbonate pigment and a nonionic or cationic adhesive, wherein the pigment has a particle size distribution such that no more than 1% by weight of the particles have an equivalent spherical diameter larger than 10 microns, at least 65% by weight of the particles have an equivalent spherical diameter smaller than 2 microns and not more than 10% by weight of the particles have an equivalent spherical diameter smaller than 0.25 micron, and wherein said pigment is dispersed with a combination of a cationic polyelectrolyte and an anionic polyelectrolyte, with the amount of cationic polyelectrolyte being in the range of about 0.01% to about 1.5% by weight, based on the weight of the dry pigment, and with the amount of anionic polyelectrolyte being in the range of about 0.01% to about 0.5% by weight.

Abstract: The present invention provides:an aqueous surface-treating agent used for surface treatment of reinforcing material, which includes a carbodiimide compound as a main component, a reinforcing material surface-treated with the above aqueous surface-treating agent, and a composite material comprising a matrix and the above reinforcing material. The aqueous surface-treating agent has good storage stability, gives no bad effect on human health owing to no use of organic solvent and, when used for the surface treatment of a reinforcing material, can provide a surface-treated reinforcing material which can produce a composite material comprising a matrix, the surface-treated reinforcing material having high adhesivity between the two components.

Abstract: Process for the production of optionally wood-containing cellulose-containing sheet-like structures, such as paper, pasteboard and card, which have been given a dry strength and/or wet strength treatment and have improved whiteness, using water-dispersible isocyanates, wherein the water-dispersible isocyanates:a) are aliphatic, cycloaliphatic, araliphatic or aromatic isocyanates having an NCO functionality of 1.8 to 4.2, mixed with polyether-modified aliphatic, cycloaliphatic, araliphatic or aromatic isocyanates having an average NCO functionality of 0.8 to 3.2,b) the isocyanate mixtures a) contain 1 to 25% by weight of isocyanate groups,c) have a content of ethylene oxide units, arranged in the form of polyether chains of average molecular weight 10 to 3500 (number-average), of 20 to 60% by weight, based on the isocyanate mixture, and if appropriated) have a content of tertiary amino groups and/or ammonium groups of 1 to 500 milliequivalents per 100 g of isocyanate mixture a).

Abstract: The invention relates to the use of coating compositions to prepare coatings having water vapor permeabilities of at least 2500 g/m.sup.2 per day (DS 2109 TM1 method) containing(A) a polyurethane containing (1) 0.1 to 75 meq/100 g of ionic groups and (2) 11 to 50% by weight of --(CH.sub.2 CH.sub.2 O).sub.

Abstract: The present invention relates to thermoplastic and biodegradable polysaccharide esters/polysaccharide ether esters, which are characterised in that they can be represented by the general structure ##STR1## wherein Polysaccharide-O represents the substituted OH groups of a polymeric saccharide unit and wherein A is a linear polyether chain of the following structureA=(E--O)nwherein E signifies a linear aliphatic or aromatic branched or unbranched chain having 2 to 11 C atoms, n is an integer equal to or greater than 0 and both B and D are a maleic acid addition product of the following structure ##STR2## wherein F is an aliphatic, saturated, monounsaturated or polyunsaturated carbon skeleton, which may optionally be provided with further substituents and wherein C can be a hydrogen atom, one or more substituents from the group dihydroxyethyl, hydroxypropyl, hydroxybutyl, methyl, ethyl, benzyl, dihydroxypropyl, carboxyalkyl, sulphoalkyl or cyanoethyl.

Abstract: This invention provides compositions suitable for treating fibrous substrates to render them durably resistant to dry soil and durably repellent to water and oil. One composition is an aqueous emulsion comprising: a dry soil resistant and water and oil repellent fluorochemical treatment and an effective amount of one or more fluorochemical surfactants wherein the surfactants comprising one or two fluorochemical groups and one or two water-solubilizing polar groups. Another composition is an aqueous emulsion comprising: a dry soil resistant and water and oil repellent fluorochemical treatment; an effective amount of one or more fluorochemical surfactants wherein the surfactants comprising one or two fluorochemical groups and one or two water-solubilizing polar groups; and one or more non-fluorinated additives.

Abstract: The substitution of a water-based phenolic thermosetting resin for a phenolic thermosetting resin in an organic solvent provides a safer and environmentally improved method for making honeycomb core. Improved processing characteristics in components manufactured from such honeycomb core are observed.

Abstract: A process is disclosed for strengthening and sizing paper which comprises the step of applying a composition comprising (a) an isocyanate and (b) an isocyanate-reactive component comprising at least one polyol having an ethylene oxide content of at least 1%, wherein said composition does not contain water to the paper by means of an electrostatic spraying device having a linear orifice.

Abstract: Hot melt wax compositions are described that render fibrous products such as paper, paperboard and corrugated paper containers water-resistant at room temperature, but enable such articles to be repulped and recycled when the coated articles are repulped in a heated nearly neutral to alkaline aqueous medium. The compositions comprise from about 20% to 97.5% by weight of a water-repellent wax that is a solid at 20.degree. C.; from about 2.

Abstract: This invention relates to a method for preparing wood composition board, such as hard board, fabricated consolidating fibers or chips under heat and pressure to form an integral board material. More particularly, this invention relates to an improved method for applying a clear or pigmented prepress coating, also known as a prepress sealer, to the surface of a fibrous mat by converting the prepress sealer into foam prior to subjecting the mat to a temperature and pressure press treatment.

Abstract: A moisture-proof paper sheet comprising a moisture-proof coating layer formed on a paper sheet substrate and comprising (a) a moisture-proof, film-forming synthetic resin (for example, carboxyl-modified SBR resin), (b) plate crystalline phyllosilicate compound particles with an average size of 5 to 50 .mu.m and an aspect ratio of 5 or more and (c) a moisture-proofness-enhancing agent, for example, urea-formaldehyde condensation reaction products, organoalkoxysilane compounds, or polyamidepolyurea compounds, has an enhanced resistance to water vapor permeation and, after use, the waste moisture-proof paper sheet can be easily re-pulped and recycled.

Abstract: A method of forming a polymer-reinforced paper which includes preparing an aqueous suspension of fibers, at least about 50 percent, by dry weight, of which are cellulosic fibers; distributing the suspension on a forming wire; removing water from the distributed suspension to form a paper; and treating the paper thus formed with a polymer-reinforcing medium which contains a bulking agent to give the polymer-reinforced paper. The treatment of the paper is adapted to provide in the polymer-reinforced paper from about 15 to about 70 percent, by weight, of bulking agent, based on the dry weight of the cellulosic fibers in the paper. Alternatively, the bulking agent can be added to a polymer-reinforced paper after it has been formed. In certain embodiments, the bulking agent is a polyhydric alcohol. In other embodiments, the bulking agent is a polyethylene glycol having a molecular weight in the range of from about 100 to about 1,500.

Abstract: An aqueous treating coating composition suitable for coating a middle corrugated layer of a double-faced liner board, the composition comprising: (A) an emulsion of wax particles, and (B) a binder that is (1) an alkali metal alginate, or (2) a solvent soluble styrene/acrylic copolymer, or (3) a mixture of the styrene/acrylic copolymer with a water-soluble melamine/formaldehyde prepolymer.

Abstract: The invention relates to sealable and peelable polymer composition which comprises 5-35 weight-% styrene modified ethylene copolymer and 95-65 weight-% ethylene butyl acrylate copolymer. Ethylene copolymer is preferably ethylene butylacrylate copolymer (E/BA) or ethylene vinyl acetate copolymer (E/VA).

Abstract: A process for the preparation of recording materials for inkjet printers by applying aqueous coating compositions to one or both sides of a sheet of paper which has been treated with size, where the coating compositions contain from 20 to 200 g/l of starch and from 1 to 50 g/l of a copolymer which is obtainable by emulsion copolymerization of 100 parts by weight of a monomer mixture comprising(a) from 10 to 65 parts by weight of styrene, .alpha.-methylstyrene, acrylonitrile and/or methacrylonitrile,(b) from 30 to 85 parts by weight of acrylic and/or methacrylic esters of alcohols having 1 to 18 carbon atoms,(c) from 5 to 25 parts by weight of monomers containing tertiary and/or quaternary amino groups, and(d) from 0 to 20 parts by weight of other monoethylenically unsaturated monomersin an aqueous medium in the presence of from 12 to 300% by weight, based on the monomers, of at least one natural or synthetic protective colloid.

Abstract: The present invention relates to melamine-formaldehyde resins comprising a guanamine, to processes for their preparation and to their use for the production of melamine resin films and edgings.

Abstract: A soft tissue product is disclosed having uniformly distributed surface deposits of a solidified composition having a melting point of from about 30.degree. C. to about 70.degree. C. The solidified composition is applied to the outer surfaces of the tissue product in melted form, preferably by rotogravure printing. The solidified composition contains an oil, a wax, and preferably a fatty alcohol.

Abstract: A lactide polymer coating resulting in a strong, repulpable, high gloss, paper coating. The lactide polymer comprises a plurality of poly(lactide) polymer chains, residual lactide in concentration of less than about 5 percent and water in concentration of less than about 2000 parts-per-million. A process for coating paper with the lactide polymer composition is also disclosed.

Abstract: Di-, tri- and poly-perfluoroalkyl-substituted alcohols and acids and derivatives thereof are described which are prepared from perfluoroalkyl iodides and di-, tri- or polyallyl alcohols or acids. These compounds contain two or more perfluoroalkyl-iodoalkyl or perfluoroalkyl-alkenyl groups and one or two alcohol or acid groups or derivatized alcohol or acid functions. They can be reacted with isocyanates, epoxy compounds, anhydrides, acids or acid derivatives to prepare a great variety of oil- and water-repellent compositions which are useful for oil- and water-repellent treatment of textiles, glass, paper, leather and other substrates.

Abstract: The invention relates to a method for protecting lignocellulosic material against yellowing caused by light or heat. The invention further concerns brightness stabilizing compositions intended for treatment of lignocellulosic materials. According to the invention, polytetrahydrofuran (PTHF) is used as the brightness stabilizing agent. Preferably PTHF having a molar mass of about 150 to 1500 is used. The invention provides a good stabilization of lignocellulosic pulp and of products containing such pulp, whereby the amount of PTHF required can be extremely small, e.g., 0.05-5% of the weight of the material.

Abstract: Recyclable and compostable coated paper stock comprising a substrate coated on at least one surface with a primer coat and a top coat both of which are water based dispersions. The primer coat comprises a water based dispersion of a polymer selected from the group comprising acrylic polymers, acrylic copolymers, polyvinyl acetate, polyvinyl alcohol, poly-ethylene vinyl acetate, poly-ethylene vinyl chloride, styrene butadiene copolymers, polyvinylidiene chloride or starch. The top coat comprises a water based dispersion of a polymer selected from the group comprising acrylic polymers, acrylic copolymers, styrene butadiene copolymers or polyvinylidiene chloride. In another embodiment the top coat further includes a wax component comprising 15-90 wt. % of the polymer and 5-85 wt. % of the wax. The substrate is coated with a primer coat prior to the application of the top coat to seal the substrate surface.

Abstract: An improved thermal ink jet recording paper, incorporating heat aged precipitated calcium carbonate ("PCC") and a binder, is disclosed. Heat aging the PCC in the presence of an organophosphonate produces discrete particles of PCC with a surface morphology and chemistry that enhances the ability of the PCC to bind to ink jet ink without binding so strongly that the color of the ink is changed. Ink jet recording papers incorporating the PCC and binders of the present invention have reduced feathering, spreading, and penetration or backside showthrough, as well as improved optical density, dry time, and water fastness.