Brevet FR3135726A1 — publié le 20231124

The present disclosure provides an article. In an embodiment, the article includes a first substrate and an adhesive layer in contact with the first substrate. The adhesive layer contains an adhesive composition. The adhesive composition includes (i) an acrylic polymer composed of polymerized units of (a) a first monomer that is a C 4 -C 18 alkyl acrylate and (b) a second monomer selected from acrylic acid, methacrylic acid, and a C 1 -C 3 alkyl acrylate optionally containing a hydroxyl group. The adhesive composition also includes (ii) at least one inorganic neutralizer, and (iii) at least one surfactant. The article includes a second substrate in contact with the adhesive layer. ARTICLE CONTAINING A WASHABLE ADHESIVE COMPOSITION BACKGROUND Articles containing labels, such as labeled plastic containers, have created difficulty in recycling the article. The adhesive and/or the label facestock typically remains on the article during the recycling process which then requires additional energy and processing steps to make the plastic container clean from the adhesive and label contaminants. The art recognizes the need for labeled plastic articles with improved recyclability. Specifically, a need exists for labeling the plastic articles with an adhesive layer that provides suitable adhesion performance; the adhesive layer simultaneously being readily separable from the plastic article—thereby enabling the plastic article to be recycled. SUMMARY The present disclosure provides an article. In an embodiment, the article includes a first substrate and an adhesive layer in contact with the first substrate. The adhesive layer contains an adhesive composition. The adhesive composition includes (i) an acrylic polymer composed of polymerized units of (a) a first monomer that is a C 4 -C 18 alkyl acrylate and (b) a second monomer selected from acrylic acid, methacrylic acid, and a C 1 -C 3 alkyl acrylate optionally containing a hydroxyl group. The adhesive composition also includes (ii) at least one inorganic neutralizer, and (iii) at least one surfactant. The article includes a second substrate in contact with the adhesive layer. DEFINITIONS Any reference to the Periodic Table of Elements is that as published by CRC Press, Inc., 1990–1991. Reference to a group of elements in this table is by the new notation for numbering groups. For purposes of United States patent practice, the contents of any referenced patent, patent application or publication are incorporated by reference in their entirety (or its equivalent U.S. version is so incorporated by reference) especially with respect to the disclosure of definitions (to the extent not inconsistent with any definitions specifically provided in this disclosure). The numerical ranges disclosed herein include all values from, and including, the lower and upper value. For ranges containing explicit values (e.g., from 1 or 2, or 3 to 5, or 6, or 7), any subrange between any two explicit values is included (e.g., the range 1-7 above includes subranges of from 1 to 2; from 2 to 6; from 5 to 7; from 3 to 7; from 5 to 6; etc.). Unless stated to the contrary, implicit from the context, or customary in the art, all parts and percents are based on weight and all test methods are current as of the filing date of this disclosure. An "acrylic polymer" is a polymer that contains polymerized acrylic monomer and, optionally, may contain at least one comonomer. An "acrylic monomer," as used herein, is a monomer with the Structure (I) below: Structure (I) wherein R 1 is a H or a C 1 -C 18 alkoxy group and R 2 is H or CH 3 . Non-limiting examples of acrylic monomers include acrylic acid, methacrylic acid, acrylates, and methacrylates. The term "alkyl" is a univalent hydrocarbon. A "hydrocarbon" is a compound composed of only hydrogen atoms and carbon atoms and containing straight chains and/or branched chains. The terms "amine" and "amino" refer to both unsubstituted amine ( e.g. NH 3 and NH 4 + ) and substituted amines ( e.g. , mono-substituted amines or di-substituted amines), wherein substituents may include, for example, alkyl, cycloalkyl, heterocyclyl, alkenyl, and aryl. The terms “blend” or “polymer blend,” as used, refers to a mixture of two or more polymers. A blend may or may not be miscible (not phase separated at molecular level). A blend may or may not be phase separated. A blend may or may not contain one or more domain configurations, as determined from transmission electron spectroscopy, light scattering, x-ray scattering, and other methods known in the art. The blend may be effected by physically mixing the two or more polymers on the macro level (for example, melt blending resins or compounding), or the micro level (for example, simultaneous forming within the same reactor). The term "composition" refers to a mixture of materials which comprise the composition, as well as reaction products and decomposition products formed from the materials of the composition. The terms "comprising," "including," "having" and their derivatives, are not intended to exclude the presence of any additional component, step or procedure, whether or not the same is specifically disclosed. In order to avoid any doubt, all compositions claimed through use of the term "comprising" may include any additional additive, adjuvant, or compound, whether polymeric or otherwise, unless stated to the contrary. In contrast, the term "consisting essentially of" excludes from the scope of any succeeding recitation any other component, step, or procedure, excepting those that are not essential to operability. The term "consisting of" excludes any component, step, or procedure not specifically delineated or listed. The term "or," unless stated otherwise, refers to the listed members individually as well as in any combination. Use of the singular includes use of the plural and vice versa. An "ethylene-based polymer" or "ethylene polymer" is a polymer that contains a majority amount of polymerized ethylene based on the weight of the polymer and, optionally, may comprise at least one comonomer. Ethylene-based polymers typically comprise at least 50 mole percent (mol%) units derived from ethylene (based on the total amount of polymerizable monomers). An "olefin-based polymer" is a polymer that contains a majority mole percent polymerized olefin monomer (based on total amount of polymerizable monomers), and optionally, may contain at least one comonomer. Nonlimiting examples of olefin-based polymers include ethylene-based polymer and propylene-based polymer. The term “polymer” or a “polymeric material,” as used herein, refers to a compound prepared by polymerizing monomers, whether of the same or a different type, that in polymerized form provide the multiple and/or repeating "units" or "mer units" that make up a polymer. The generic term polymer thus embraces the term homopolymer, usually employed to refer to polymers prepared from only one type of monomer, and the term copolymer, usually employed to refer to polymers prepared from at least two types of monomers. It also embraces all forms of copolymer, e.g., random, block, etc. The terms "ethylene/α-olefin polymer" and "propylene/α-olefin polymer" are indicative of copolymer as described above prepared from polymerizing ethylene or propylene respectively and one or more additional, polymerizable α-olefin monomer. It is noted that although a polymer is often referred to as being "made of" one or more specified monomers, "based on" a specified monomer or monomer type, "containing" a specified monomer content, or the like, in this context the term "monomer" is understood to be referring to the polymerized remnant of the specified monomer and not to the unpolymerized species. In general, polymers herein are referred to has being based on "units" that are the polymerized form of a corresponding monomer. A "propylene-based polymer" is a polymer that contains a majority amount of polymerized propylene based on the weight of the polymer and, optionally, may comprise at least one comonomer. Propylene-based polymers typically comprise at least 50 mole percent (mol%) units derived from propylene (based on the total amount of polymerizable monomers). The terms "propylene-based polymer" and "polypropylene" may be used interchangeably. TEST METHODS Adhesion. Samples are typically tested according the FINAT method no.2 characterizing the adhesive peel strength at 90° peel angel from stainless steel ("SS"), Glass or high density polyethylene (“HDPE”) plates after 20 minutes and 24 hours dwell time. All measurements are typically performed in climatized room temperature 23°C ± 2°C and 50% RH ± 5% RH. The FINAT (Féderation Internationale des fabricants et transformateurs d' Adhésifs et Thermocollants ) organization is the European association for the self-adhesive label industry (Laan van Nieuw-Oost Indië 131-G, 2593 BM The Hague, P.O. Box 85612, 2508 CH The Hague, The Netherlands). Coating Weight. The adhesive coat weight is expressed as the weight of adhesive on a standard area of material - in grams per square meter (gsm or g/m 2 ). In the product assembly, an adequate amount of s emulsion based adhesive (liquid stage) was coated on the pre-siliconized carrier (called liner) and dried for 2 min at 105°C to remove the water from wet adhesive dispersion. This way the 18gsm dry adhesive sample film was prepared and then laminated to the label facestock (film or paper). Cohesion/Shear. To measure the cohesive strength of the adhesive the FINAT Test Method No. 8 is used where test sample of 1 inch x 1 inch size is applied to the stainless steel panel according to the method described in FINAT test method no.8 and then exposed to 1 kg hanging weight. The measurement is performed on the stainless steel plate but other substrates as glass can be considered. The measurement is performed in climatized room temperature 23°C ± 2°C and 50% RH ± 5% RH and the sample cohesion failure is recorded in "hours." Loop Tack. The standard FINAT method no. 9 was used to characterize the initial adhesion (adhesive tack) when the adhesive comes in contact with the substrate (glass, HDPE, SS). Testing was conducted after the adhesive coated laminate was conditioned in a controlled environment (23°C ± 2°C and 50% RH ± 5% RH relative humidity) for at least 4 hours. A strip 2.54 cm (1 inch) wide was cut and folded over to form a loop, exposing the adhesive side. It was then placed in between the jaws of the INSTRON (TM) tensile tester, and the lower jaw was lowered at a rate of 300 mm per minute to the substrate such that a square area of the adhesive of 2.54 cm by 2.54 cm (1 inch x 1 inch) comes in contact with the substrate for 1 second. Then the adhesive was pulled away and the peak force to pull the adhesive away from the substrate was recorded. An article comprising: A. a first substrate; and B. an adhesive layer in contact with the first substrate, the adhesive layer comprising an adhesive composition comprising (i) an acrylic polymer comprising polymerized units of (a) a first monomer that is a C 4 -C 18 alkyl acrylate; and (b) a second monomer selected from the group consisting of acrylic acid, methacrylic acid, and a C 1 -C 3 alkyl acrylate optionally containing a hydroxyl group; (ii) at least one inorganic neutralizer; and (iii) at least one surfactant; and C. a second substrate in contact with the adhesive layer. The article of claim 1 comprising (D) a primer layer located between the adhesive layer and the second substrate. The article of any of claims 1-2, wherein the C 4 -C 18 alkyl acrylate is selected from the group consisting of butyl acrylate, butyl methacrylate, ethylhexyl acrylate, octyl acrylate, isooctyl methacrylate, decyl methacrylate, isodecyl methacrylate, lauryl methacrylate, pentadecyl methacrylate, and stearyl methacrylate. The article of any of claims 1-3, wherein the C 1 -C 3 alkyl acrylate optionally containing a hydroxyl group is selected from the group consisting of methyl acrylate, ethyl acrylate, propyl acrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, and hydroxypropyl methacrylate. The article of any one of claims 1-4, wherein the acrylic polymer is a 2-ethylhexyl acrylate/ethyl acrylate/acrylic acid terpolymer. The article of any one of claims 1-5, wherein the terpolymer comprises, based on the total weight of the terpolymer (i) from 50 wt% to 71 wt% of ethylhexyl acrylate; (ii) from 25 wt% to 40 wt% of ethyl acrylate; and (iii) from 1 wt% to 10 wt% of acrylic acid. The article of any one of claims 1-6, wherein the at least one inorganic neutralizer is sodium hydroxide. The article of any one of claims 1-7, wherein the at least one surfactant comprises a fatty alcohol ether sulfate. The article of any one of claims 1-8, wherein the adhesive composition comprises, based on the total weight of the adhesive composition from 80 wt% to 99 wt% of the acrylic polymer; from 0.05 wt% to 5 wt% of the at least one inorganic neutralizer; and from 0.1 wt% to 5 wt% of the at least one surfactant. The article of any one of claims 1-9, wherein the first substrate is selected from the group consisting of a plastic container and a plastic film and the second substrate is a label. A process comprising: (1) providing a batch comprising an article and a wash solution, the article comprising A. a first substrate; and B. an adhesive layer in contact with the first substrate, the adhesive layer comprising an adhesive composition comprising (i) an acrylic polymer comprising polymerized units of (a) a first monomer that is a C 4 -C 18 alkyl acrylate; and (b) a second monomer selected from the group consisting of acrylic acid, methacrylic acid, and a C 1 -C 3 alkyl acrylate optionally containing a hydroxyl group; (ii) at least one inorganic neutralizer; and (iii) at least one surfactant; and C. a second substrate in contact with the adhesive layer; and the wash solution comprising water, a surfactant, and a base; (2) contacting the article with the wash solution under conditions sufficient to separate the second substrate from the first substrate. The process of claim 11, wherein the contacting step comprises immersing the article in the wash solution and agitating the article and the wash solution in temperature below 65°C. The process of claim 11 or 12, wherein the base is sodium hydroxide. The process of any of claims 11-13, wherein the surfactant comprises a non-ionic secondary alcohol ethoxylate. The process of any one of claims 11-14, wherein the wash solution has from 0.1 wt% to 5 wt% of the base, based on the total weight of the wash solution.