EP4511538A1 - Method for preparing a polyolefin coating for a paper substrate - Google Patents

Method for preparing a polyolefin coating for a paper substrate

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Publication number
EP4511538A1
EP4511538A1 EP23735561.5A EP23735561A EP4511538A1 EP 4511538 A1 EP4511538 A1 EP 4511538A1 EP 23735561 A EP23735561 A EP 23735561A EP 4511538 A1 EP4511538 A1 EP 4511538A1
Authority
EP
European Patent Office
Prior art keywords
fatty amide
range
primary fatty
particles
alkyl primary
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP23735561.5A
Other languages
German (de)
French (fr)
Inventor
Hanze YING
David L. Malotky
Ray E. Drumright
Jonathan F. MASON
Luqing QI
Bernhard U. Kainz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dow Global Technologies LLC
Original Assignee
Dow Global Technologies LLC
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 Dow Global Technologies LLC filed Critical Dow Global Technologies LLC
Publication of EP4511538A1 publication Critical patent/EP4511538A1/en
Pending legal-status Critical Current

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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
    • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/22—Polyalkenes, e.g. polystyrene
    • 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
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/07—Nitrogen-containing compounds
    • 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
    • D21H17/35—Polyalkenes, e.g. polystyrene
    • 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
    • D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
    • 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
    • D21H17/71—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes
    • D21H17/72—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes of organic material
    • 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
    • D21H19/12—Coatings without pigments applied as a solution using water as the only solvent, e.g. in the presence of acid or alkaline compounds
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • 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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04—Physical treatment, e.g. heating, irradiating
    • 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
    • D21H27/10—Packing paper

Definitions

  • the present invention relates to a method for preparing a thin polyolefin coating for a paper substrate.
  • the coated paper has been found to have useful moisture vapor transmission rate properties.
  • ultra-thin coatings can be prepared by applying a waterborne polyolefin emulsion onto the paper substrate, followed by curing; nevertheless, meeting targets for moisture vapor transmission rate (MVTR) and coefficient of friction (CoF) remain elusive. Accordingly, it would be an advance in the field of coated paper substrates to prepare a thin coating that meets the application requirements for MVTR and provides a recyclable package.
  • MVTR moisture vapor transmission rate
  • CoF coefficient of friction
  • the present invention addresses a need in the art by providing a method comprising the steps of a) applying onto paper a composition comprising an aqueous dispersion of poly-Ca-Cs-olefin particles, a dispersant, and a Cs-Cze-alkyl primary fatty amide; and b) drying the composition to form a coating having a coat weight in the range of from 1 g/m 2 to 20 g/m 2 .
  • the method of the present invention can be used to provide ultra-thin coatings on a paper substrate with advantageous moisture vapor transmission rate and coefficient of friction properties.
  • the present invention is a method comprising the steps of a) applying onto paper a composition comprising an aqueous dispersion of poly-C2-C3-olefin particles, a dispersant, and a Cs-C26-alkyl primary fatty amide; and b) drying the composition to form a coating having a coat weight in the range of from 1 g/m 2 to 20 g/m 2 .
  • poly-C2-C3-olefin particles refer to polyethylene particles, polypropylene particles, and poly(ethylene-propylene) copolymers particles.
  • the polyethylene may be an ethylene-C4-Cio-a-olefin copolymer (i.e., linear low-density polyethylene) such as an ethylene- 1 -butene copolymer, an ethylene- 1— hexene copolymer, and an ethylene- 1 -octene copolymer.
  • linear low-density polyethylene is AFFINITY PL1280 LLDPE Ethylene-Octene Copolymer (A Trademark of The Dow Chemical Company or its affiliates).
  • the polyethylene may also be a high-density polyethylene, commercially available, for example, as DOWTM DMDA-8940 NT 7 HDPE Resin; or a low-density polyethylene.
  • a commercially available ethylene-propylene copolymer is VERSIFYTM 4200 Propylene-Ethylene Copolymer (Trademarks of The Dow Chemical Company or its affiliates), and a commercially available polypropylene is Braskem 6D43 Random Copolymer.
  • the particles which are believed to contain the C2-C3-polyolefin and some amount of the dispersant and the primary fatty amide associated therewith, preferably have a volume mean particle size in the range of from 200 nm or from 300 nm to 5 pm or to 3 pm or to 1.5 pm, as measured by dynamic light scattering.
  • the dispersant is a copolymer of ethylene and a carboxylic acid monomer or a salt thereof.
  • suitable dispersants include ethylene- acrylic acid copolymers, ethylene-methacrylic acid copolymers, and ethylene-itaconic acid copolymers, and lithium, sodium, and potassium salts thereof.
  • the weight-to-weight ratio of structural units of ethylene to carboxylic acid monomer or salt thereof is preferably in the range of from 95:5, more preferably from 90: 10, and most preferably from 85:15; to 70:30, more preferably to 75:25.
  • structural unit of the named monomer refers to the remnant of the monomer after polymerization.
  • a structural unit of methacrylic acid is as illustrated: structural unit of methacrylic acid where the dotted lines represent the points of attachment of the structural unit to the polymer backbone.
  • Examples of commercially available dispersants include PRIMACORTM 5980i Ethylene- Acrylic Acid Copolymer and NUCREL 960TM Ethylene- Methacrylic Acid Copolymer (Trademarks of The Dow Chemical Company or its affiliates).
  • the C.5-C26-alkyl primary fatty amide may be linear or branched and may be saturated or partially unsaturated with one or two or three double bonds.
  • the fatty amide may also be a Cio--C24-alkyl primary fatty amide or a Ci6-C22-alkyl primary fatty amide.
  • suitable fatty amides include linear and branched Cis -alkyl mono-unsaturated fatty amides; linear and branched Cis-alkyl saturated fatty amides; linear and branched C22-alkyl mono-unsaturated fatty amides; and linear and branched C22-alkyl saturated fatty amides.
  • the Cs-C26-alkyl primary fatty amide preferably has a melting point in the range of from 50 °C or from 65 °C to 115 °C or to 100 °C or to 90 °C.
  • the concentration of the poly-C2-C3-olefin particles less any associated dispersant or primary fatty amide is preferably in the range of from 40 or from 60 or from 70 weight percent, to 95 or to 90 weight percent, based on the weight of the polyolefin, the dispersant, and the Cs-C26-alkyl primary fatty amide.
  • the concentration of the dispersant is preferably in the range of from 4 or from 9, or from 15 weight percent, to 50, or to 40, or to 30 weight percent, based on the weight of the polyolefin particles, the dispersant, and the C5-C26 -alkyl fatty amide.
  • the concentration of the Cs-C26-alkyl primary fatty amide is preferably in the range of from 0.5 or from 1 to 5 or to 4 or to 3 weight percent, based on the weight of the polyolefin particles, the dispersant, and the C5-C26-alkyl fatty amide.
  • the pH of the composition is preferably in the range of from 8 to 11.
  • a neutralizing agent such as KOH is advantageously used to adjust the pH to the desired level.
  • the composition advantageously further comprises a stabilizing amount of an anionic surfactant such as a C10-C24 linear or branched alkyl or aralkyl carboxylate, sulfate, or phosphate; or a nonionic surfactant such as a secondary alcohol ethoxylate or an ethylene oxide propylene oxide block copolymer surfactant.
  • an anionic surfactant such as a C10-C24 linear or branched alkyl or aralkyl carboxylate, sulfate, or phosphate
  • a nonionic surfactant such as a secondary alcohol ethoxylate or an ethylene oxide propylene oxide block copolymer surfactant.
  • coat weights in the range of 1 g/m 2 or from 2 g/m 2 or from 5 g/m 2 to 20 g/m 2 or to 12 g/m 2 or to 10 g/m 2 can be achieved with desirable moisture vapor transmission rate (MVTR) and coefficient of friction (CoF) properties.
  • MVTR moisture vapor transmission rate
  • CoF coefficient of friction
  • UPM Brilliant 62 Glassine Paper (basis wt. 62 g/m 2 ) was coated with the polyolefin dispersion using a drawdown bar and dried in a forced air oven for 2 min at 100° C to a final coating areal density (coat weight) of 8 g/m 2 ( ⁇ 8 to 9 pm coating thickness). Coat weights were measured by punching holes in coated and uncoated UPM paper with a circular die to form discs having a specified diameter (D cm). The coated discs (Wl) were weighed against the uncoated disc (W2) and the coat weights were calculated by the formula:
  • Moisture Vapor Transmission Rates were determined in accordance with
  • ASTM E96/E96M A coated paper sample was sealed to the open end of a permeability cup followed by exposure of the sample to a controlled temperature and humidity environment (typically, a humidity chamber). MVTR was determined based by measuring mass uptake for the cup as a function of time.
  • the dynamic coefficients of friction were measured using a Texture Analyzer with a sliding friction rig in accordance with TAPPI T549.
  • a piece of coated paper was affixed to the bottom of a sled weighing 200 g with the coated side facing down.
  • Another piece of coated paper was affixed to a plane with coated side facing up.
  • a string was attached to the sled and pulled so that the sled traversed the plane at the speed of 2.5 mm/s for at least 100 mm.
  • the plateaued force Fd (unit: gram force) for the constant moving of the sled was recorded.
  • the degree of neutralization of the polyolefin dispersions was determined by the following equation:
  • DoN 100 where W is the weight of the base added in g, EB is the equivalent weight of the base, Ai is the acid number of the ith component in units of mg KOH/g and the CD i is the weight fraction of the ith component in POD dispersion solid.
  • Table 1 illustrates the components and feed rates used to prepare Examples 1-4 and Comparative Examples 1 -5. Feed rates are shown parenthetically. The general procedure is shown following Table 1.
  • PO refers to the polyolefin
  • Amide refers to the fatty amide
  • ITO. refers to the initial water rate
  • ILOd refers to the dilution water rate
  • Solids refers to the wt.% solids of the polyolefin the dispersant, the fatty amide, and the anionic surfactant in the dispersion
  • PS refers to the particle size of the particles in microns as determined by dynamic light scattering.
  • OA Oleamide, m.p. 70 °C
  • EA Esuracamide, m.p 80 °C
  • BA behenamide, m.p.
  • 112 C° is a C22-alkyl saturated primary fatty amide
  • EBS ethylene bis-stearamide, m.p. 145° C
  • OPA oleyl palmitamide, m.p. 60-66 °C
  • SEA stearyl euracamide, m.p. 70-75 °C
  • C4o-alkyl secondary fatty amide is a C4o-alkyl secondary fatty amide.
  • the PO, N960, and the Amide were fed into a 25-mm diameter twin screw extruder using separate controlled rate feeders.
  • the anionic surfactant (Oleic acid) was pumped into the melt zone of the extruder as a liquid using an Isco syringe pump at a feed rate of 3.4 mL/min.
  • the PO, N960, and the Amide were forwarded through the extruder and melted to form an intermediate liquid melt material.
  • the extruder temperature profile was ramped up to 150 °C. Water and 30% aq. KOH were mixed and fed to the extruder at an initial water introduction site after a uniform polymer melt was formed; then, dilution water was fed into the extruder.
  • the extruder speed was 450 rpm for all samples except Comparative Example 5, where the extruder speed was 400 rpm.
  • a backpressure regulator was used to adjust the pressure inside the extruder barrel to a pressure adapted to reduce steam formation, generally in the range of 2 MPa to 4 MPa. Each aqueous dispersion exited from the extruder and was filtered first through a 200-pm filter.
  • the solids content of dispersions was measured using an infrared solids analyzer, and the volume mean particle size of the polymer particles was measured using a COULTERTM LS-230 particle size analyzer (Beckman Coulter Corporation, Fullerton, CA). Table 2 illustrates the MVTR and CoF for the examples and comparative examples.
  • the coating thicknesses for each sample was 8 gsm.
  • PO:N960:Amide refers to the w/w/w ratios of the polyolefin, the dispersant, and the fatty amide.
  • the data show an improvement in MVTR for coatings containing primary fatty amides when compared with coatings containing either no amide additive or coatings containing secondary fatty amides.
  • dynamic CoFs of 0.3 or less are acceptable; for other applications, CoFs of less than 0.2 are required.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The present invention relates to a method comprising the steps of a) applying onto paper a composition comprising an aqueous dispersion of poly-C2-C3-olefin particles, a dispersant, and a C5-C26-alkyl primary fatty amide; and b) drying the composition to form a coating having a coat weight in the range of from 1 g/m2 to 20 g/m2. The method of the present invention is useful for preparing coatings on paper with desirable moisture vapor transition rate and coefficient of friction properties.

Description

Method for Preparing a Polyolefin Coating for a Paper Substrate
Background of the Invention
The present invention relates to a method for preparing a thin polyolefin coating for a paper substrate. The coated paper has been found to have useful moisture vapor transmission rate properties.
Consumer demand for sustainable paper used in packaging is fueling interest in improving barrier properties and recyclability of coated paper. Barrier performance of paper is known to be enhanced with polyolefin coatings, which also provide heat-seal properties; still, attaining a coating areal density (coat weight) of < 10 g/m2 by application of an extruded polyolefin layer onto a paper substrate has been elusive. Achieving these ultra-low coat weights is especially important in flexible packaging applications, where paper substrates have a paper areal density (basis weight) of < 60 g/m2, and where the market requires > 85 wt% fiber recycling based on the mass of the article.
As disclosed in US 10,612,193 B2 (col. 2, Table 2) ultra-thin coatings can be prepared by applying a waterborne polyolefin emulsion onto the paper substrate, followed by curing; nevertheless, meeting targets for moisture vapor transmission rate (MVTR) and coefficient of friction (CoF) remain elusive. Accordingly, it would be an advance in the field of coated paper substrates to prepare a thin coating that meets the application requirements for MVTR and provides a recyclable package.
Summary of the Invention
The present invention addresses a need in the art by providing a method comprising the steps of a) applying onto paper a composition comprising an aqueous dispersion of poly-Ca-Cs-olefin particles, a dispersant, and a Cs-Cze-alkyl primary fatty amide; and b) drying the composition to form a coating having a coat weight in the range of from 1 g/m2 to 20 g/m2. The method of the present invention can be used to provide ultra-thin coatings on a paper substrate with advantageous moisture vapor transmission rate and coefficient of friction properties. Detailed Description of the Invention
The present invention is a method comprising the steps of a) applying onto paper a composition comprising an aqueous dispersion of poly-C2-C3-olefin particles, a dispersant, and a Cs-C26-alkyl primary fatty amide; and b) drying the composition to form a coating having a coat weight in the range of from 1 g/m2 to 20 g/m2.
As used herein, “poly-C2-C3-olefin particles” refer to polyethylene particles, polypropylene particles, and poly(ethylene-propylene) copolymers particles. The polyethylene may be an ethylene-C4-Cio-a-olefin copolymer (i.e., linear low-density polyethylene) such as an ethylene- 1 -butene copolymer, an ethylene- 1— hexene copolymer, and an ethylene- 1 -octene copolymer. A commercially available linear low-density polyethylene is AFFINITY PL1280 LLDPE Ethylene-Octene Copolymer (A Trademark of The Dow Chemical Company or its Affiliates). The polyethylene may also be a high-density polyethylene, commercially available, for example, as DOW™ DMDA-8940 NT 7 HDPE Resin; or a low-density polyethylene. An example of a commercially available ethylene-propylene copolymer is VERSIFY™ 4200 Propylene-Ethylene Copolymer (Trademarks of The Dow Chemical Company or its Affiliates), and a commercially available polypropylene is Braskem 6D43 Random Copolymer. The particles, which are believed to contain the C2-C3-polyolefin and some amount of the dispersant and the primary fatty amide associated therewith, preferably have a volume mean particle size in the range of from 200 nm or from 300 nm to 5 pm or to 3 pm or to 1.5 pm, as measured by dynamic light scattering.
The dispersant is a copolymer of ethylene and a carboxylic acid monomer or a salt thereof. Examples of suitable dispersants include ethylene- acrylic acid copolymers, ethylene-methacrylic acid copolymers, and ethylene-itaconic acid copolymers, and lithium, sodium, and potassium salts thereof.
The weight-to-weight ratio of structural units of ethylene to carboxylic acid monomer or salt thereof is preferably in the range of from 95:5, more preferably from 90: 10, and most preferably from 85:15; to 70:30, more preferably to 75:25. As used herein, the term “structural unit” of the named monomer refers to the remnant of the monomer after polymerization. For example, a structural unit of methacrylic acid is as illustrated: structural unit of methacrylic acid where the dotted lines represent the points of attachment of the structural unit to the polymer backbone.
Examples of commercially available dispersants include PRIMACOR™ 5980i Ethylene- Acrylic Acid Copolymer and NUCREL 960™ Ethylene- Methacrylic Acid Copolymer (Trademarks of The Dow Chemical Company or its Affiliates).
The C.5-C26-alkyl primary fatty amide may be linear or branched and may be saturated or partially unsaturated with one or two or three double bonds. The fatty amide may also be a Cio--C24-alkyl primary fatty amide or a Ci6-C22-alkyl primary fatty amide. Examples of suitable fatty amides include linear and branched Cis -alkyl mono-unsaturated fatty amides; linear and branched Cis-alkyl saturated fatty amides; linear and branched C22-alkyl mono-unsaturated fatty amides; and linear and branched C22-alkyl saturated fatty amides. The Cs-C26-alkyl primary fatty amide preferably has a melting point in the range of from 50 °C or from 65 °C to 115 °C or to 100 °C or to 90 °C.
The concentration of the poly-C2-C3-olefin particles less any associated dispersant or primary fatty amide is preferably in the range of from 40 or from 60 or from 70 weight percent, to 95 or to 90 weight percent, based on the weight of the polyolefin, the dispersant, and the Cs-C26-alkyl primary fatty amide. The concentration of the dispersant is preferably in the range of from 4 or from 9, or from 15 weight percent, to 50, or to 40, or to 30 weight percent, based on the weight of the polyolefin particles, the dispersant, and the C5-C26 -alkyl fatty amide. The concentration of the Cs-C26-alkyl primary fatty amide is preferably in the range of from 0.5 or from 1 to 5 or to 4 or to 3 weight percent, based on the weight of the polyolefin particles, the dispersant, and the C5-C26-alkyl fatty amide. The pH of the composition is preferably in the range of from 8 to 11. A neutralizing agent such as KOH is advantageously used to adjust the pH to the desired level.
The composition advantageously further comprises a stabilizing amount of an anionic surfactant such as a C10-C24 linear or branched alkyl or aralkyl carboxylate, sulfate, or phosphate; or a nonionic surfactant such as a secondary alcohol ethoxylate or an ethylene oxide propylene oxide block copolymer surfactant. The composition is advantageously applied to a paper substrate with a drawdown bar, followed by removal of water, preferably at advanced temperatures as described in the next section.
It has been discovered that coat weights in the range of 1 g/m2, or from 2 g/m2 or from 5 g/m2 to 20 g/m2 or to 12 g/m2 or to 10 g/m2 can be achieved with desirable moisture vapor transmission rate (MVTR) and coefficient of friction (CoF) properties.
Method for Preparing Coated Substrates and Measuring Coat Weights
UPM Brilliant 62 Glassine Paper (basis wt. 62 g/m2) was coated with the polyolefin dispersion using a drawdown bar and dried in a forced air oven for 2 min at 100° C to a final coating areal density (coat weight) of 8 g/m2 (~ 8 to 9 pm coating thickness). Coat weights were measured by punching holes in coated and uncoated UPM paper with a circular die to form discs having a specified diameter (D cm). The coated discs (Wl) were weighed against the uncoated disc (W2) and the coat weights were calculated by the formula:
Moisture Vapor Transmission Rate Measurements
Moisture Vapor Transmission Rates (MVTRs) were determined in accordance with
ASTM E96/E96M. A coated paper sample was sealed to the open end of a permeability cup followed by exposure of the sample to a controlled temperature and humidity environment (typically, a humidity chamber). MVTR was determined based by measuring mass uptake for the cup as a function of time.
Dynamic Coefficient of Friction Measurements
The dynamic coefficients of friction (CoFs) were measured using a Texture Analyzer with a sliding friction rig in accordance with TAPPI T549. A piece of coated paper was affixed to the bottom of a sled weighing 200 g with the coated side facing down. Another piece of coated paper was affixed to a plane with coated side facing up. A string was attached to the sled and pulled so that the sled traversed the plane at the speed of 2.5 mm/s for at least 100 mm. The plateaued force Fd (unit: gram force) for the constant moving of the sled was recorded.
Dynamic CoFs were calculated as Fd/200. Calculation of Degree of Neutralization
The degree of neutralization of the polyolefin dispersions was determined by the following equation:
56000 x W
DoN = 100 where W is the weight of the base added in g, EB is the equivalent weight of the base, Ai is the acid number of the ith component in units of mg KOH/g and the CD i is the weight fraction of the ith component in POD dispersion solid.
Examples
Table 1 illustrates the components and feed rates used to prepare Examples 1-4 and Comparative Examples 1 -5. Feed rates are shown parenthetically. The general procedure is shown following Table 1. PO refers to the polyolefin; Amide refers to the fatty amide; ITO., refers to the initial water rate; ILOd refers to the dilution water rate; Solids refers to the wt.% solids of the polyolefin the dispersant, the fatty amide, and the anionic surfactant in the dispersion; and PS refers to the particle size of the particles in microns as determined by dynamic light scattering.
PL1280 refers to AFFINITY™ PL 1280 LLDPE Ethylene- Octene Copolymer; V4200 refers to VERSIFY™ Ethylene-Propylene Copolymer; N960 refers to NUCREL™ N960 Ethylene- Methacrylic Acid Copolymer. OA (Oleamide, m.p. 70 °C) is a Cis-alkyl mono-unsaturated primary fatty amide; EA (Euracamide, m.p 80 °C) is a C22-alkyl mono-unsaturated primary fatty amide; BA (behenamide, m.p. 112 C°) is a C22-alkyl saturated primary fatty amide; EBS (ethylene bis-stearamide, m.p. 145° C) is a Css-alkyl secondary fatty amide; OPA (oleyl palmitamide, m.p. 60-66 °C) is a C34-alkyl secondary fatty amide; SEA (stearyl euracamide, m.p. 70-75 °C) is a C4o-alkyl secondary fatty amide.
The degree of neutralization for Comparative Examples 1-4 and Examples 1-6 was 75% and the degree of neutralization for Comparative Example 5 and Example 7 was 80%. Table 1 - Components and Feed Rates for Examples
General Procedure for Preparation of Aqueous Dispersions of Polyolefin Dispersions Aqueous dispersions were prepared by the following general procedure:
The PO, N960, and the Amide (except for Comparative Examples 1 and 5) were fed into a 25-mm diameter twin screw extruder using separate controlled rate feeders. The anionic surfactant (Oleic acid) was pumped into the melt zone of the extruder as a liquid using an Isco syringe pump at a feed rate of 3.4 mL/min. The PO, N960, and the Amide were forwarded through the extruder and melted to form an intermediate liquid melt material.
The extruder temperature profile was ramped up to 150 °C. Water and 30% aq. KOH were mixed and fed to the extruder at an initial water introduction site after a uniform polymer melt was formed; then, dilution water was fed into the extruder. The extruder speed was 450 rpm for all samples except Comparative Example 5, where the extruder speed was 400 rpm. At the extruder outlet, a backpressure regulator was used to adjust the pressure inside the extruder barrel to a pressure adapted to reduce steam formation, generally in the range of 2 MPa to 4 MPa. Each aqueous dispersion exited from the extruder and was filtered first through a 200-pm filter.
The solids content of dispersions was measured using an infrared solids analyzer, and the volume mean particle size of the polymer particles was measured using a COULTER™ LS-230 particle size analyzer (Beckman Coulter Corporation, Fullerton, CA). Table 2 illustrates the MVTR and CoF for the examples and comparative examples. The coating thicknesses for each sample was 8 gsm. PO:N960:Amide refers to the w/w/w ratios of the polyolefin, the dispersant, and the fatty amide.
Table 2 - MVTR and CoF of Samples
The data show an improvement in MVTR for coatings containing primary fatty amides when compared with coatings containing either no amide additive or coatings containing secondary fatty amides. For certain applications, dynamic CoFs of 0.3 or less are acceptable; for other applications, CoFs of less than 0.2 are required.

Claims

Claims:
1. A method comprising the steps of a) applying onto paper a composition comprising an aqueous dispersion of poly-C2-C3-olefin particles, a dispersant, and a Cs-C26-alkyl primary fatty amide; and b) drying the composition to form a coating having a coat weight in the range of from 1 g/m2 to 20 g/m2.
2. The method of Claim 1 wherein, based on the weight of the poly-C2-C3-olefin particles, the dispersant, and the C5-C26-alkyl primary fatty amide in the composition, the concentration of the polyolefin particles is in the range of from 40 to 95 weight percent; the concentration of the dispersant is in the range of from 4 to 50 weight percent; and the concentration of the C5-C26- alkyl primary fatty amide is in the range of from 0.5 to 5 weight percent.
3. The method of Claim 2 wherein the dispersant is an ethylene- acrylic acid copolymer or a salt thereof, or an ethylene-methacrylic acid copolymer or a salt thereof; and the Cs-C26-alkyl primary fatty amide is a Cw/C24-alkyl primary fatty amide; and wherein the composition is dried to form a coating with a coat weight in the range of from 5 g/m2 to 10 g/m2.
4. The method of Claim 3 wherein the Cio-C.24-alkyl primary fatty amide is a Ci6-C.22-alkyl primary fatty amide having a melting point in the range of from 50 °C to 115 °C, and the poly-C2-C3-olefin particles are ethylene-C4-Cio-a-olefin copolymer particles.
5. The method of Claim 4 wherein the ethylene-C4-Cio-a-olefin copolymer particles are ethylene- 1 -octene copolymer particles.
6. The method of Claim 3 wherein the Cio-C24-alkyl primary fatty amide is a Ci6-C22-alkyl primary fatty amide having a melting point in the range of from 50 °C to 115 °C, and the poly-C2-C3-olefin particles are polypropylene particles.
7. The method of 3 wherein the Cio-C24-alkyl primary fatty amide is a Ci6-C22-alkyl primary fatty amide having a melting point in the range of from 50 °C to 115 °C, and the poly-C2-C3-olefin particles are poly(ethylene-propylene) copolymers particles.
8. The method of Claim 2 wherein, based on the weight of the poly-C2-C3-olefin particles, the dispersant, and the Cs-C26-alkyl primary fatty amide, the concentration of the poly-C2-C3-olefin is in the range of from 60 to 90 weight percent; the concentration of the dispersant is in the range of from 9 to 40 weight percent; and the concentration of the Cs-C26-alkyl primary fatty amide is in the range of from 1 to 4 weight percent.
9. The method of any of Claims 4 to 7 wherein, based on the weight of the poly-C2-C3-olefin particles, the dispersant, and the Ci6-C.22-alkyl primary fatty amide, the concentration of the poly-C2-C3-olefin is in the range of from 60 to 90 weight percent; the concentration of the dispersant is in the range of from 9 to 40 weight percent; and the concentration of the Ci6-C22-alkyl primary fatty amide is in the range of from 1 to 4 weight percent.
EP23735561.5A 2022-06-09 2023-06-02 Method for preparing a polyolefin coating for a paper substrate Pending EP4511538A1 (en)

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