Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
  • B32B7/04—Interconnection of layers
  • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B29/00—Layered products comprising a layer of paper or cardboard
  • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B29/00—Layered products comprising a layer of paper or cardboard
  • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B29/00—Layered products comprising a layer of paper or cardboard
  • B32B29/06—Layered products comprising a layer of paper or cardboard specially treated, e.g. surfaced, parchmentised
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/20—Macromolecular organic compounds
  • D21H17/33—Synthetic macromolecular compounds
  • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • D21H17/36—Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/63—Inorganic compounds
  • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
  • D21H27/30—Multi-ply
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2255/00—Coating on the layer surface
  • B32B2255/12—Coating on the layer surface on paper layer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2255/00—Coating on the layer surface
  • B32B2255/26—Polymeric coating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2255/00—Coating on the layer surface
  • B32B2255/28—Multiple coating on one surface
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
  • B32B2260/02—Composition of the impregnated, bonded or embedded layer
  • B32B2260/028—Paper layer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
  • B32B2260/04—Impregnation, embedding, or binder material
  • B32B2260/046—Synthetic resin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/40—Properties of the layers or laminate having particular optical properties
  • B32B2307/406—Bright, glossy, shiny surface
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/40—Properties of the layers or laminate having particular optical properties
  • B32B2307/41—Opaque
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/726—Permeability to liquids, absorption
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/726—Permeability to liquids, absorption
  • B32B2307/7265—Non-permeable
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/728—Hydrophilic
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2554/00—Paper of special types, e.g. banknotes
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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  • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
  • Y10T428/254—Polymeric or resinous material
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
  • Y10T428/256—Heavy metal or aluminum or compound thereof
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
  • Y10T428/258—Alkali metal or alkaline earth metal or compound thereof
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
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  • Y10T428/259—Silicic material
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31511—Of epoxy ether
  • Y10T428/31515—As intermediate layer
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31652—Of asbestos
  • Y10T428/31663—As siloxane, silicone or silane
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31786—Of polyester [e.g., alkyd, etc.]
  • Y10T428/3179—Next to cellulosic
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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  • Y10T428/31855—Of addition polymer from unsaturated monomers
  • Y10T428/3188—Next to cellulosic
  • Y10T428/31895—Paper or wood
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31855—Of addition polymer from unsaturated monomers
  • Y10T428/3188—Next to cellulosic
  • Y10T428/31895—Paper or wood
  • Y10T428/31899—Addition polymer of hydrocarbon[s] only
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31855—Of addition polymer from unsaturated monomers
  • Y10T428/3188—Next to cellulosic
  • Y10T428/31895—Paper or wood
  • Y10T428/31899—Addition polymer of hydrocarbon[s] only
  • Y10T428/31902—Monoethylenically unsaturated
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31971—Of carbohydrate
  • Y10T428/31993—Of paper

Definitions

• the present invention refers to paper for sketches, art tracing, and graphic design applications, such paper being manufactured based on a lamination of at least two sheets of bond paper with at least one layer of intermediate emulsion with pigments which are non-transparent and waterproof to the passing of the ink.
• the paper produced in this way is non-transparent and prevents the seepage of inks and liquid materials, favors the drying of the inks, averts the running of the inks and accepts without problem the application of dry materials for drawings and sketches.
• pens with water-based ink, solvent base ink, gel inks, Chinese ink, oil-based ink and other black and varied-colored inks; water colors; inks for other drawing, sketching and writing instruments; ball-point pens; and dry materials such as carbon, charcoal, pastel colors, chalks, carbon pencil, graphite of different hardness, colored pencils, materials with a wax-base and other dry materials.
• a sketch paper is described for art and design applications, which allows the use of drawing, design or painting materials without fluid materials or inks seeping through to the other side of the paper. It possesses an optimal texture for drawing with solid materials.
• the paper is non-transparent, thus what is drawn on one side is not seen on the other side of the paper, allowing for the use of both sides of the paper.
• the present disclosure describes both the sketch paper itself and methods for creating it.
• the sketch paper of the present invention is suitable for drawing sketches with felt-tipped pens or markers, as well as water or solvent-based ink pens, gel inks, Chinese ink, oil-based inks, ball point pens, other inks, without the ink seeping through to the other side of the paper. It also prevents the image from being visible from one side of the paper to the other, i.e. the sketch paper is not transparent. With these properties sketches may be made on both sides of each sheet.
• the sketch paper also facilitates drying of the ink due to its absorbent qualities. Due to its texture and surface finish it permits sketching with dry materials, including charcoal, pastel colors, chalks, graphite and colored pencils, materials with a wax base and other dry materials.
• the sketch paper according to the present disclosure also permits the application of commonly-used fixatives for some dry materials. It possesses the novel property that liquid or dry materials are dried or cured and not transferred to adjacent papers.
• the opacity of the sketch paper according to the present disclosure is generally between 88% and 99.5% TAPPI (Technical Association for the Pulp and Paper Industry) T-425 and, in certain embodiments, between 90% and 99.5% TAPPI T-425, and it has a minimum brightness of 90% TAPPI T-425.
• TAPPI Technical Association for the Pulp and Paper Industry
• the sketch paper according to the present disclosure may comprise at least two base sheets of bond paper, which may be laminated together.
• the sketch paper may further comprise at least one intermediate layer of an emulsion containing non-transparent pigments, creating a waterproof barrier against migration of the inks and their solvents or vehicles.
• a sketch paper according to the present disclosure may have a minimum brightness of 90 on the TAPPI scale of brightness; may be acid-free and sulfites free; may have a high virgin alpha-cellulose fiber content above or equivalent to 78%; may possess a Gurley Hill porosity of 20-10 Sec/100 cc air suitable for receiving all kinds of inks such as water-base, solvent-base, gel, oils, or having mixed diluents which may be applied with felt-tipped pens, markers, pens, paint brushes, brushes, stylographic pens or other sketching, writing, painting or drawing instruments, this porosity ensuring that these inks dry well without allowing the lines and figures made thereon to run or blur; which may have a suitable finish or texture to fully accept the application of dry drawing and art materials such as carbon, charcoal, pastel colors, chalks, carbon pencils, graphite of different hardness, colored pencils, materials based on waxes and other dry materials; and which may even accept renderings based on watercolor and gouache.
• a sketch paper according to the present disclosure may achieve the unique result of allowing a suitable degree of ink absorption so as to provide fast and complete drying, preventing smears or running, while simultaneously providing a surface texture to which dry materials can be efficiently applied. This feature makes it novel as it facilitates the use of mixed techniques.
• a sketch paper may comprise at least two base sheets of bond paper of the same type and same weight of 68 g/m 2 , which are laminated together.
• a sketch paper according to this embodiment of the present disclosure may further comprise at least one intermediate layer inserted between the two base sheets.
• such intermediate layer may be an aqueous emulsion of opacifier components, such aqueous emulsion comprising: at least one chemical opacifier compound selected from among the pigments of carbon black, rutile titanium dioxide, anatase titanium dioxide, calcium carbonate, kaolin with laminar structure, calcined kaolin, white polymers, organic pigments, inorganic pigments; one or more adhesives; at least one styrene emulsion selected from among butadiene, acrylic emulsion, acetylated starch, oxidized starch and other compounds such as low viscosity highly hydrolyzed polyvinyl alcohols; and one or more viscosity and surface tension control agents to provide stability to the selected emulsion, such as acrylic polymers and non-ionic surfactants, selected from among the materials commercially known as the surfynoles family
• the sketch paper may further comprise one or more additional intermediate layers inserted between the two base sheets, such additional intermediate layers comprising one or more additional emulsions.
• emulsion or emulsions may be applied by impregnating equipment, and their thicknesses may be calculated by the use of jets or sprinklers, bound rods, scrapers, air blades or any other suitable means used in the state of the art. It will be understood by one having ordinary skill in the art that reference is made to these methods only as a means to accomplish the methods according to the present disclosure and do not represent the invention itself.
• the sketch paper may comprise one or more synthetic and/or natural resins which may be placed on the inside of each base sheet, i.e., the face of each base sheet which is to be laminated to the other base sheet, to prevent ink bleeding and to preserve fine lines and sketches in larger areas.
• the sketch paper may further comprise one or more synthetic and/or natural resins placed on the outside face of each base sheet (to remain after lamination) to provide additional protection against ink bleeding and the blurring of fine lines, etc.
• At least two sheets of greater weight may be used, such as 80 g/m 2 , 90 g/m 2 and up to 100 g/m 2 In still other embodiments, sheets of even higher weights may be used.
• the two base sheets may have different finishes or textures on the outside face to optimize their application for dry drawing materials, which may be achieved by covering the outside faces of one or both of the base sheets with one or more kaolins, adhesives or other additives.
• the two base sheets may be impregnated, prior to lamination, with a cationic wet strength additive together with carboxylated polyvinyl alcohols to provide a protective barrier.
• Suitable cationic polymers include polymers of polyamine-epichlorohydrine resin.
• Suitable commercially available resins include KYMENE 718 and POLYCUP LX manufactured by Hercules Inc, now part of Ashland Inc.
• the sketch paper may further comprise an intermediate layer of paper placed between the two base sheets, wherein this intermediate paper layer may be coated on one or both sides by resins, and wherein at least one resin is selected from the group of polyolefins, polyethylene, polypropylene, styrene acrylic resins, polyester resins or other polymers as well as waxes and silicones.
• resins such embodiments may be particularly useful for applications in which the user wishes to apply amounts of ink which would saturate, or almost saturate, the sketch paper with fluid water- or oil- or solvent-based inks
• At least one of the base sheets is applied with an aqueous emulsion using any suitable system used in the art for impregnating or covering base papers such as, but not limited to, air blade or color-dispensing bound rod, calibrated spray jets, rotogravure roller, or scraper.
• any suitable system used in the art for impregnating or covering base papers such as, but not limited to, air blade or color-dispensing bound rod, calibrated spray jets, rotogravure roller, or scraper.
• Table I depicts exemplary implementations of the first three embodiments described above.
• the aqueous emulsion was applied, and its thickness calibrated, using a color dispensing bound rod to give a dry thickness of between 3 and 8 grams per square meter (gsm) and, more specifically, of 4 to 5 g/m 2 .
• the opacity of the sketch paper is achieved by using an aqueous emulsion with one or more white pigments having a high refraction index.
• White pigments such as kaolins, calcined kaolins, calcium carbonate, synthetic polymers and titanium dioxide, due to their optic properties, are substances with a higher level of refraction (2.4, as a diamond). Even when pulverized or mixed with other loads, the average size of an 0.5 micron particle pigment provides a greater covering power and for this same reason is very opaque.
• the calcined kaolins are also an alternative to provide opacity due to the laminar form of the particles and because of the small particle size of onlyl to 2 microns also contributes to ink absorption.
• Table II shows exemplary implementations of the fourth embodiment according to the present disclosure, wherein the two base sheets may be impregnated, prior to lamination, with a solution of insolubilizing agents that absorb to the paper fibers, together with carboxylated polyvinyl alcohols to provide a protective barrier.
• base sheets having a porosity of between 20 and 10 sec/100 ml Gurley Hill may be used with previous priming in the paper machine. This may provide sufficient absorption to be receptive to the inks or emulsions.
• an aqueous emulsion containing white loads and an adhesive as described with respect to the embodiments shown in Table I, may be applied to the first base sheet by means of a rotogravure system.
• An emulsion promoting adhesion may be applied to the second base sheet.
• the two base sheets may be laminated together by means of a mechanism operated by steel cylinders.
• Table III shows exemplary implementations of the fifth embodiment according to the present disclosure, wherein the sketch paper further comprises an intermediate layer of paper placed between the two base sheets, and wherein this intermediate paper layer is coated on one or both sides by resins.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Inorganic Chemistry (AREA)
• Paper (AREA)
• Laminated Bodies (AREA)

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Citations (12)

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• 2013
  • 2013-01-10 MX MX2013000399A patent/MX357920B/es active IP Right Grant
  • 2013-06-17 US US13/919,355 patent/US20140193633A1/en not_active Abandoned
• 2017
  • 2017-10-06 US US15/727,383 patent/US10864703B2/en active Active

Patent Citations (13)

Non-Patent Citations (3)

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