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EP-4735552-A1 - ADHESIVE COMPOSITION

EP4735552A1EP 4735552 A1EP4735552 A1EP 4735552A1EP-4735552-A1

Abstract

The present disclosure provides a composition. In an embodiment, the composition is an adhesive composition. The adhesive composition includes an acrylic emulsion, a tackifier, and a rheology modifier. The present adhesive composition can be an adhesive layer disposed between a first substrate and a second substrate in a laminate structure, the first substrate and the second substrate selected from roof substrate and/or roofing membrane.

Inventors

  • WU, JIE
  • HU, YUSHAN
  • GUO, YINZHONG

Assignees

  • DOW GLOBAL TECHNOLOGIES LLC

Dates

Publication Date
20260506
Application Date
20240410

Claims (9)

  1. 1. An adhesive composition comprising: an acrylic emulsion; a tackifier; and a rheology modifier.
  2. 2. The adhesive composition of claim 1 wherein the acrylic emulsion comprises an acrylic-based polymer comprising one or more acrylic-based monomers selected from the group consisting of butyl acrylate (BA), ethylhexyl acrylate (2-EHA), ethyl acrylate (EA), methyl acrylate (MA), butyl methacrylate (BMA), 2-hydroxylethyl methacrylate (2-HEMA), allyl acrylate, methacrylic acid, acrylic acid, and combinations thereof.
  3. 3. The adhesive composition of claim 2 wherein the acrylic-based polymer comprises 2- ethylhexyl acrylate monomer, ethylene vinyl acetate comonomer, styrene, acrylic acid, itaconic acid, and sodium vinyl sulfonate monomer.
  4. 4. The adhesive composition of any of claims 1-3 wherein the tackifier is a rosin resin.
  5. 5. The adhesive composition of any of claims 1-4 wherein the rheology modifier is selected from the group consisting of a hydrophobically modified, alkali swellable emulsion (HASE) rheology modifier, a hydrophobically-modified ethylene oxide urethane (HEUR) rheology modifier, and combinations thereof.
  6. 6. The adhesive composition of any of claims 1-5 wherein the adhesive composition comprises (1) from 65 wt% to 94 wt% of the acrylic emulsion, (2) from 5 wt% to 35 wt% of the tackifier, (3) from 0.2 wt% to 3 wt% of the rheology modifier, (4) from 0 wt% to 0.5 wt% of a defoamer.
  7. 7. The adhesive composition of any of claims 1-6 wherein the adhesive composition has a pH from 7.5 to 9.5.
  8. 8. The adhesive composition of any of claims 1-7 wherein the adhesive composition has a viscosity from 15,000 cP to 200,000 cP.
  9. 9. A laminate structure comprising: a first substrate; a second substrate; and an adhesive composition disposed between the first substrate the second substrate, the adhesive composition comprising an acrylic-based polymer; a tackifier; and a rheology modifier.

Description

ADHESIVE COMPOSITION BACKGROUND [001] Roofing membrane is a sheet-like structure, usually single-ply, with moisture barrier properties and is composed of a polymeric material such as ethylene-propylene-diene terpolymer (EPDM), butyl rubber, neoprene, polyvinyl chloride (PVC), chlorinated polyethylene, thermoplastic polyolefin (TPO) and/or modified bitumen/asphalt. Roofing membrane is typically overlapped and/or spliced together with an adhesive to form a continuous, water-tight sheet for covering a roof area. One way to attach roofing membrane to other structural substrate(s) is by way of an adhesive composition. Adhesive composition finds favor as the adherent for roofing membrane (as opposed to rivets or fusion bonds, for example), because adhesive composition is easy to apply as a continuous layer, and adhesive composition provides even and uniform adhesion compared to rivets or fusion bonds which provide point bonding. [002] The adhesive composition requires appropriate bond strength to adhere the roofing membrane to other industrial substrates such as steel, wood, concrete, roof boards, and insulation. As roofing membrane is exposed to stresses such as roof movement, heavy winds, freeze-thaw cycles and thermal cycles, so too must the adhesive composition be resilient and capable to withstand these same stresses. To meet these demands, conventional adhesive composition for roofing membrane is typically solvent-based and utilizes organic solvents such as toluene and xylene. Use of these solvents poses environmental, health and fire hazards, making solvent-based adhesive compositions undesirable. [003] Thus, the art recognizes the need for an adhesive composition for roofing membrane, that reduces, or eliminates, the use of harmful organic solvents, yet maintains, or exceeds the bond strength of conventional solvent-based roofing adhesives. SUMMARY [004] The present disclosure provides a composition. In an embodiment, the composition is an adhesive composition. The adhesive composition includes an acrylic emulsion, a tackifier, and a rheology modifier. [005] The present disclosure provides a laminate structure. In an embodiment, the laminate structure includes a first substrate and a second substrate. An adhesive composition is disposed between the first substrate and the second substrate. The adhesive composition is composed of an acrylic emulsion, a tackifier, and a rheology modifier. [006] In an embodiment, the first substrate and the second substrate are selected from roof substrate and/or roofing membrane. DEFINITIONS [007] 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. [008] 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 US 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) and general knowledge in the art. [009] The numerical ranges disclosed herein include all values from, and including, the lower and upper value. For ranges containing explicit values (e.g., 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.). [0010] 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. [0011] An "acrylic-based monomer," as used herein, is a monomer containing the Structure (A) below: Structure (A) wherein Ri is H or a Ci-Cis alkyl group, and R2 is H or CH3. Acrylic-based monomers include acrylic acid, methacrylic acid, acrylates, and methacrylates. [0012] The terms "blend" or "polymer blend," as used herein, is a blend of two or more polymers. Such a blend may or may not be miscible (not phase separated at molecular level). Such a blend may or may not be phase separated. Such 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. [0013] 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. [0014] 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 ad