WO1991005107A1 - Couchage par fusion de papier pouvant etre repulpe et procedes - Google Patents

Couchage par fusion de papier pouvant etre repulpe et procedes Download PDF

Info

Publication number
WO1991005107A1
WO1991005107A1 PCT/US1990/005599 US9005599W WO9105107A1 WO 1991005107 A1 WO1991005107 A1 WO 1991005107A1 US 9005599 W US9005599 W US 9005599W WO 9105107 A1 WO9105107 A1 WO 9105107A1
Authority
WO
WIPO (PCT)
Prior art keywords
wax
coating
paper
chemical compound
coated
Prior art date
Application number
PCT/US1990/005599
Other languages
English (en)
Inventor
John S. Michelman
Original Assignee
Michelman, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Michelman, Inc. filed Critical Michelman, Inc.
Publication of WO1991005107A1 publication Critical patent/WO1991005107A1/fr

Links

Classifications

    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/18—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising waxes

Definitions

  • the present invention relates generally to a hot melt wax coating composition containing at least one chemical compound which is either itself capable of acting as a latent dispersant for the coating or capable of being chemically modified so as to act as a dispersant for the coating, within an aqueous environment, thus rendering the hot melt coating more readily redispersable.
  • the present invention also relates to a coated paper product using such coating which renders the coated paper more readily repulpable (recyclable) with standard paper mill equipment.
  • Other related aspects of the present invention include a method of coating paper with the novel coating composition and a method of repulping such coated paper.
  • Paper and paperboard products are frequently coated in order to form a barrier against gases such as moisture; liquids such as water, oils or other solvents; and solids such as ice and greases. Should the paper be used as a container, it is advantageous to have a coating which acts as a barrier to both internally or externally sourced gases, liquids or solids such as those mentioned above.
  • coating paper Another benefit of coating paper is to render the paper relatively nonabraisive so as to prevent a container made from such paper from damaging, or being damaged by, the container contents or adjacent surfaces. This can occur for instance when a paper container and its contents are exposed to the vibration attendant to long distance travel such as by truck or train.
  • Another reason for coating paper is to increase the structural integrity of the paper by rendering it more rigid.
  • a container made of coated paper has more strength both under normal conditions and in more hostile environments, such as moisture-containing environments and/or corrosive environments.
  • the present invention relates to hot melt wax coatings which enjoy some advantages over other types of coatings including low cost, ease of application and not requiring the application and subsequent evaporation of greater amounts of solvent or water on and from the paper substrate.
  • hot melt coated papers suffer from one major disadvantage in that they cannot be easily recycled and must, therefore, be disposed of as waste (such as by burning) or used as landfill.
  • increased environmental awareness has made these alternatives increasingly less desirable, if not illegal, and impracticable.
  • the hot melt coating cannot be readily separated from the paper substrate, and the hot melt coating does not break down in aqueous environment of a pulping machine, such as those used in the recycling of paper products.
  • the hot melt coating contaminates and clogs the pulping and paper-making machinery.
  • the hot melt coated papers of the prior art have not been recyclable and have thus rendered a potentially valuable pulp resource a serious waste disposal problem.
  • Hot melt coating materials are, of course, well known and can be obtained in the form of molten liquids or thermoplastic slabs, flakes or pellets.
  • Typical examples of such materials include natural and/or synthetic plastics and waxes as set forth, for instance, in U.S. Patent No. 3,058,871 to Davis, U.S. Patent No. 2,859,110 to Sanford and U.S. Patent No. 3,021,252 to Hill.
  • thermoplastic materials include, for instance, paraffin, microcrystalline wax and other waxes, which may be used with additives such as hydrocarbon resins and synthetic polymers.
  • additives such as hydrocarbon resins and synthetic polymers.
  • Patent 2,703,754 to Myers the separation of pulp and coating material was made by a combination of emulsification and solvent extraction.
  • the most frequently suggested procedure for recycling hot melt coated paper involves suspending the coating particles in a hot aqueous system as suggested in U.S. Patent 3,822,178 to Von Koeppen et al, U.S. Patent 2,614,922 to Hope, U.S. Patent 2,859,110 to Sanford and U.S. Patent 2,959,513 to Savage.
  • Von Koeppen et al suggests charging a pulper or beater with hot melt coated or impregnated paper and combining this charge with water and certain nonionic emulsifiers at a temperature high enough to melt the hot melt coating.
  • a further object of the invention is to create a pulping mixture which does not require a physical separation between a hot melt coating and the paper in a pulper during a recycling process.
  • Yet another object of the invention is to provide a paper with a hot melt coating which may be readily and adequately emulsified during recycling in a conventional repulping process without deleteriously affecting the process equipment or resulting paper.
  • the type of pulper which may be used in repulping the coated paper of the present invention include any of those pulpers known in the art such as a Hydropulper, Hollander and the like.
  • the slurry can then be transferred to any type of processing equipment, whether Fourdrinier, cylinder, or other equipment.
  • Another object of the present invention is to provide a hot melt coating which can be readily emulsified or dispersed during a repulping process. Additional objects, advantages, and other novel features of the invention will be set forth in part in the description that follows and in part will become apparent to those skilled in the art upon examination of the following or may be learned with the practice of the invention. The objects and advantages of the present invention may be realized and attained by means of the compositions and methods particularly pointed out in the appended claims, including the functional equivalents thereof.
  • the present invention provides an improved hot melt coating comprising (a) at least one wax; and (b) at least one chemical compound incorporated in such at least one wax which is either itself capable of dispersing such at least one wax in a substantially aqueous environment, or capable of undergoing chemical modifications so as to be capable of dispersing such at least one wax in a substantially aqueous environment.
  • the hot melt wax coating of the present invention includes a latent dispersant, emulsifier or surfactant (or chemically modifiable precursor thereof) so that the hot melt coating of the present invention affords all of the advantages of other hot melt coatings while being more readily dispersable in a substantially aqueous environment.
  • hot melt coatings are defined, and shall include, compositions used to coat or _ ? _
  • paper substrates as paper, paperboard, corrugated liner board and medium, and the like used on panels, cartons, cups, plates, containers and miscellaneous packagings; and which are applied as liquids at temperatures above room temperature, normally between about 30°C to about 200°C, and which, upon cooling, form solid coatings on the paper.
  • emulsifier dispersant, surfactant, surface acting agent and detergent (and the corresponding verbs emulsify and disperse) are used interchangeably and mutually inclusive to mean substances which aid in rendering the wax portion of the hot melt coating (including optional resin or emulsifiable wax components thereof) more soluble or miscible in a substantially aqueous environment.
  • the first class comprises chemical compounds which are themselves soluble or miscible in the wax component of the hot melt coating composition of the present invention and are capable of undergoing chemical modification so as to be capable of dispersing the wax component of the hot melt coating composition (including any optional emulsifiable waxes and/or resins as described hereinbelow) .
  • the second general class of latent dispersants comprise those chemical compounds which are soluble or miscible within the wax component of the hot melt coating composition (including the above-mentioned optional ingredients) and which are themselves capable of dispersing such wax components and other optional ingredients without prior chemical modification.
  • Both first and second classes of latent dispersants may include any anionic, nonionic or cationic dispersants, emulsifiers or surfactants known in the art. Examples of such compounds can be found in McCutcheon's Emulsifiers and Detergents. North American Edition, The Manufacturing Confectioner Publishing Company, Glen Rock, New Jersey (1988), which is hereby incorporated herein by reference.
  • anionic dispersants include acids, esters, alcohols, sulfonates and soaps.
  • Cationic dispersants are exemplified by amines and amides and their reaction products.
  • Ethoxylated nonylphenols are examples of nonionic dispersants.
  • Such dispersants preferably contain between 10 and 30 carbon atoms.
  • the dispersant(s) in total are preferably present in the range of from about 10 to about 30 percent of the recyclable hot melt coating.
  • wax or waxes used in accordance with the present invention include a wide variety of waxes and resinous compositions which have been employed in paper coatings.
  • waxes include animal, vegetable and mineral waxes such as paraffin and microcrystalline wax, as well as synthetic waxes such as polyethylene.
  • wax shall include all such waxes and such resinous compositions used in hot melt coating compositions known in the art.
  • any such wax have a melting point in the range of from about 30°C to about 200°C and a softening point rendering it free-flowing within said temperature range, such as a viscosity of from about 5 to about 2000 CPS at 120°C.
  • the wax component is preferably present within a range from about 50 to 90 percent of the recyclable hot melt coating. It is also understood that mixtures of resins and/or waxes may also be applied in the hot melt coating of the present invention.
  • the hot melt coating of the present invention may also include optional resins which may be used to give the coating composition more pronounced characteristics, such as increased gloss or rigidity, as desired. Typical amounts of such resins are generally within the range of from about 0 to 30 percent.
  • optional resins include, for example thermoplastic polymeric materials such as hydrocarbon resins, ethylene vinylacetate, polyethylene and the like.
  • emulsifiable waxes can be generally described as functionalized waxes (such as those having an acid or ester number greater than zero) which increase the overall emulsifiability of the hot melt coating composition in a substantially aqueous environment.
  • emulsifiable wax is oxidized polyethylene.
  • Emulsifiable wax(es) in total may be present in the range of from about 0 to about 30 percent of the recyclable hot melt coating.
  • a latent dispersant of the first class is stearic acid which can be converted to an emulsifiable form by the addition of a strong base such as sodium hydroxide or potassium hydroxide.
  • Another aspect of the present invention is a method of coating paper with the hot melt coating of the present invention, and a coated paper resulting therefrom.
  • the hot melt coating composition is prepared by mixing at least one wax (together with any optional resin or emulsifiable wax) and at least one chemical compound which acts as a latent dispersant (or chemically modifiable precursor thereof) as described above. Such mixture is maintained at a temperature sufficient to render it liquid and may be applied by a variety of techniques known in the art including spraying, curtain coating, roller coating, cascading and dipping.
  • the coated paper product can then be repulped by placing the coated paper product in an aqueous environment and applying a sufficient amount of chemical and physical energy to convert the paper to a pulp form.
  • the repulping mixture must include a chemical agent capable of modifying such compound so as to render it capable of dispersing the wax portion of the coating composition (and any optional resin or emulsifiable wax) .
  • a strong base such as sodium hydroxide or potassium hydroxide
  • Sample A is an example of a hot melt coating composition containing paraffin wax as the major component of the coating composition with a dispersant of the above-described first class requiring chemical modification, (such as stearic acid) and an optional emulsifiable wax.
  • Sample B is a hot melt coating composition again with paraffin as the major coating composition component, a dispersant, an optional emulsifiable wax (such as polyethylene), and an optional hydrocarbon resin added to alter characteristics, such as rigidity, of the coating composition.
  • Sample C is the same paraffin-based coating composition using only the dispersant and the optional hydrocarbon resin component.
  • the preferred hot melt coating compositions described above may be applied using any of the methods described above.
  • the paper is placed in a substantially aqueous environment and if the first class dispersant is used, it is appropriately chemically modified so as to render it capable of acting as a dispersant for the hot melt coating.
  • Such chemical modification may be done according to methods known in the art and will, of course, vary with the type of first class dispersant used. For example, if stearic acid is used, an appropriate chemical modification may be treatment with a strong base (such as KOH and NaOH) .
  • the paper is further subjected to chemical and mechanical energy (such as in a repulping system) sufficient to render the paper into pulp form.

Landscapes

  • Paper (AREA)

Abstract

Composition de couchage en cire thermofusible contenant au moins un composé chimique soit capable d'agir comme dispersant latent de couchage soit pouvant être modifié chimiquement de manière à agir comme dispersant de couchage, dans un environnement aqueux, rendant ainsi le couchage thermofusible plus facilement redispersable. L'invention concerne également un produit de papier couché utilisant ledit couchage, lequel rend le papier couché plus facilement repulpable (recyclable) à l'aide d'un équipement de fabrique de papier classique. D'autres aspects associés de l'invention comprennent un procédé de couchage de papier à l'aide de la nouvelle composition de couchage, ainsi qu'un procédé de repulpage dudit papier couché.
PCT/US1990/005599 1989-10-03 1990-10-02 Couchage par fusion de papier pouvant etre repulpe et procedes WO1991005107A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US41652989A 1989-10-03 1989-10-03
US416,529 1989-10-03

Publications (1)

Publication Number Publication Date
WO1991005107A1 true WO1991005107A1 (fr) 1991-04-18

Family

ID=23650323

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1990/005599 WO1991005107A1 (fr) 1989-10-03 1990-10-02 Couchage par fusion de papier pouvant etre repulpe et procedes

Country Status (2)

Country Link
AU (1) AU6630590A (fr)
WO (1) WO1991005107A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0610101A1 (fr) * 1993-02-05 1994-08-10 The Mead Corporation Récipients recyclables recouverts de cire
WO1995003360A2 (fr) * 1993-07-22 1995-02-02 S. C. Johnson & Son, Inc. Compositions desintegrables d'acides gras et de polymeres thermofusibles pour produits fibreux
WO1995003135A1 (fr) * 1993-07-22 1995-02-02 S.C. Johnson & Son, Inc. Compositions a base de cire/polymer thermofusible desintegrable pour produits fibreux
US5414039A (en) * 1993-02-16 1995-05-09 Petrolite Corporation Repulpable hot melt adhesive for packaging materials containing an ethylene vinyl acetate copolymer having 40-60 weight percent of vinyl acetate units, a tackifier and a high molecular weight oxygen-containing polymer
US5436287A (en) * 1993-02-16 1995-07-25 Petrolite Corporation Repulpable laminating adhesive containing an ethylene vinyl acetate copolymer having 40-60 weight percent of vinyl acetate units, an oxygen-containing comound, a tackifier and a wax
US5441998A (en) * 1993-02-16 1995-08-15 Petrolite Corporation Repulpable hot melt adhesives
US5539035A (en) * 1994-10-12 1996-07-23 The Mead Corporation Recyclable wax-coated containers
WO1999047248A1 (fr) * 1998-03-16 1999-09-23 Nalco Chemical Company Dispersants de contaminants utiles dans le recyclage de contenants traites
US6113738A (en) * 1998-03-16 2000-09-05 Nalco Chemical Company Use of additives to breakdown and stabilize wax during fiber recycle
US6416620B1 (en) 1996-03-26 2002-07-09 The International Group, Inc. Method of repulping repulpable and recyclable moisture resistant coated articles

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE PAPERCHEM,NØ57-07877,Institute of Paper &JP-A-86047896 (OJI PAPER)Published 08-03-86,see whole abstract *

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0610101A1 (fr) * 1993-02-05 1994-08-10 The Mead Corporation Récipients recyclables recouverts de cire
US5414039A (en) * 1993-02-16 1995-05-09 Petrolite Corporation Repulpable hot melt adhesive for packaging materials containing an ethylene vinyl acetate copolymer having 40-60 weight percent of vinyl acetate units, a tackifier and a high molecular weight oxygen-containing polymer
US5436287A (en) * 1993-02-16 1995-07-25 Petrolite Corporation Repulpable laminating adhesive containing an ethylene vinyl acetate copolymer having 40-60 weight percent of vinyl acetate units, an oxygen-containing comound, a tackifier and a wax
US5441998A (en) * 1993-02-16 1995-08-15 Petrolite Corporation Repulpable hot melt adhesives
US5700516A (en) * 1993-07-22 1997-12-23 S. C. Johnson Commerical Markets, Inc. Repulpable hot melt polymer/wax compositions for fibrous products
WO1995003360A2 (fr) * 1993-07-22 1995-02-02 S. C. Johnson & Son, Inc. Compositions desintegrables d'acides gras et de polymeres thermofusibles pour produits fibreux
WO1995003135A1 (fr) * 1993-07-22 1995-02-02 S.C. Johnson & Son, Inc. Compositions a base de cire/polymer thermofusible desintegrable pour produits fibreux
WO1995003360A3 (fr) * 1993-07-22 1995-04-13 Johnson & Son Inc S C Compositions desintegrables d'acides gras et de polymeres thermofusibles pour produits fibreux
US5491190A (en) * 1993-07-22 1996-02-13 S. C. Johnson & Son, Inc. Repulpable hot melt polymer/fatty acid compositions for fibrous products
US5587202A (en) * 1993-07-22 1996-12-24 S. C. Johnson & Son, Inc. Repulpable hot melt polymer/fatty acid compositions for fibrous products
US5599596A (en) * 1993-07-22 1997-02-04 S. C. Johnson & Son, Inc. Repulpable hot melt polymer/fatty acid compositions for fibrous products
US5539035A (en) * 1994-10-12 1996-07-23 The Mead Corporation Recyclable wax-coated containers
US6416620B1 (en) 1996-03-26 2002-07-09 The International Group, Inc. Method of repulping repulpable and recyclable moisture resistant coated articles
WO1999047248A1 (fr) * 1998-03-16 1999-09-23 Nalco Chemical Company Dispersants de contaminants utiles dans le recyclage de contenants traites
US6113738A (en) * 1998-03-16 2000-09-05 Nalco Chemical Company Use of additives to breakdown and stabilize wax during fiber recycle
US6248793B1 (en) 1998-03-16 2001-06-19 Nalco Chemical Company Contaminant dispersants useful in recycling of treated containers
US6548558B2 (en) 1998-03-16 2003-04-15 Ondeo Nalco Company Contaminant dispersants useful in recycling of treated containers

Also Published As

Publication number Publication date
AU6630590A (en) 1991-04-28

Similar Documents

Publication Publication Date Title
US6273993B1 (en) Method of dispersing wax from a hot melt wax-coated paper
CA1327103C (fr) Methode de desencrage de papier de rebut
US4117199A (en) Process for producing moisture and water-proof paper
US5626945A (en) Repulpable, water repellant paperboard
US3822178A (en) Process for repulping waxed paper using a water soluble nonionic emulsifier
US20050123780A1 (en) Moisture resistant, repulpable paper products and method of making same
US5491190A (en) Repulpable hot melt polymer/fatty acid compositions for fibrous products
US6150452A (en) Methods and compositions for treating stickies
WO1991005107A1 (fr) Couchage par fusion de papier pouvant etre repulpe et procedes
US4676836A (en) Anionic Lubricant dispersions useful in paper coatings
CA2094421C (fr) Procedes pour inhiber les depots de contaminants organiques dans la pate a papier
US5587204A (en) Recyclable paperboard composites
EP0804505B1 (fr) Procede et composition pour realiser un revetement servant de barriere contre la vapeur, destine a des emballages flexibles et susceptible d'etre re-incorpore dans de la pate a papier
CA2126939A1 (fr) Recyclage de papier use de xerographie a l'aide de particules organiques
US5527383A (en) Lubricant additives for paper coating compositions
WO1994025672A1 (fr) Compositions liquides destinees a ameliorer la resistance et l'hydrophobicite de produits a base de filtres cellulosiques moulees
US6228212B1 (en) Method of removing wax from cellulosic fiber used in a fiber suspension for a paper-making machine
JPH09268492A (ja) 耐水剤及びそれを用いた耐水紙
US6150451A (en) Method and composition for providing repulpable moisture vapor barrier coating for flexible packaging
JPH06280190A (ja) 蝋組成物、その蝋組成物を被覆した紙容器およびその紙容器の再生方法
Cathie The effect of packaging adhesives on wastepaper recycling—a review
CA2099755A1 (fr) Procede de desencrage
Lancour Sticky control during pulping of secondary fibers
Onwuneme The Effect of Sizing and Wet-Strength Agents on the Ease of Ink Removal in Reclaiming of Ink Printed Waste Paper
JPH07316993A (ja) 裏カ−ボン複写紙の古紙パルプ製造方法

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AU BB BG BR CA DK FI HU JP KP KR LK MC MG MW NO RO SD SU

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE BF BJ CF CG CH CM DE DK ES FR GA GB IT LU ML MR NL SE SN TD TG

NENP Non-entry into the national phase

Ref country code: CA