Poly(vinyl acetal) sheets exhibiting enhanced adhesion to inorganic surfaces

{
  "publication_number": "US9382355B2",
  "country": "US",
  "kind": "B2",
  "title": "Poly(vinyl acetal) sheets exhibiting enhanced adhesion to inorganic surfaces",
  "abstract": "Resin layers and interlayers exhibiting enhanced adhesion to inorganic surfaces, such as glass, are provided. In some cases, the layers and interlayers may comprise at least one adhesion stabilizing agent for improving adhesion to various surfaces, even in the presence of moisture. Such layers and interlayers may be useful, for example, in multiple layer panels, such as, for example, safety glass used in automotive and architectural applications.",
  "claims": [
    "1. An interlayer comprising: a layer comprising a poly(vinyl acetal) resin, wherein said resin layer exhibits a peel adhesion retention to glass of at least 25 percent after exposure to 95% relative humidity at 50° C. for 1 week.",
    "2. The interlayer of claim 1, wherein said layer exhibits a 90° peel adhesion of at least 8 N/cm after exposure to 95% relative humidity at 50° C. for 1 week.",
    "3. The interlayer of claim 1, wherein said interlayer exhibits a loss of peel adhesion of not more than 60 percent after exposure to 95% relative humidity at 50° C. for 1 week.",
    "4. The interlayer of claim 1, wherein said layer further comprises at least one silanol-containing adhesion stabilizing agent, wherein said layer comprises one or more surface-treated locations exhibiting a silanol concentration gradient that is characterized by a surface concentration of elemental silicon that is greater than a mid-thickness concentration of elemental silicon, and wherein said surface concentration of elemental silicon is in the range of from 0.1 to 15 atomic percent, measured by XPS.",
    "5. A multiple layer panel comprising at least one rigid substrate and said interlayer of claim 1.",
    "6. An interlayer comprising a poly(vinyl acetal) layer having a moisture content of at least 1 weight percent, and wherein said layer exhibits a 90° peel adhesion of at least 5 N/cm after exposure to 95% relative humidity at 50° C. for week.",
    "7. The interlayer of claim 6, wherein said interlayer exhibits a peel adhesion retention of at least 40 percent after exposure to 95% relative humidity at 50° C. for 1 week.",
    "8. The interlayer of claim 6, wherein said layer further comprises at least one silanol-containing adhesion stabilizing agent, wherein said layer comprises one or more surface-treated locations exhibiting a silanol concentration gradient that is characterized by a surface concentration of elemental silicon that is greater than a mid-thickness concentration of elemental silicon, and wherein the molar ratio of said surface concentration to said mid-thickness concentration at said surface-treated locations is at least 10:1.",
    "9. A multiple layer panel comprising at least one rigid substrate and said interlayer of claim 6, wherein said rigid substrate comprises a material selected from the group consisting of metal, ceramics, glass, and combinations thereof.",
    "10. An interlayer sheet comprising a poly(vinyl acetal) resin and at least one silanol-containing adhesion stabilizing agent, wherein said sheet comprises one or more surface-treated locations exhibiting a silanol concentration gradient characterized by a surface concentration of elemental silicon that is greater than a mid-thickness concentration of elemental silicon.",
    "11. The interlayer of claim 10, wherein said sheet comprises a perimeter region defined as the portion of said sheet located within 2 inches of the perimeter edges of said sheet, wherein at least a portion of said surface-treated locations are located within said perimeter region and wherein at least 10 percent of the total surface area of said perimeter region is made up of surface-treated locations.",
    "12. The interlayer of claim 10, wherein the molar ratio of said surface concentration to said mid-thickness concentration is at least 10:1.",
    "13. The interlayer of claim 10, wherein said surface concentration of elemental silicon is in the range of from 0.3 to 3 atomic percent, measured by XPS.",
    "14. The interlayer of claim 10, wherein said interlayer exhibits a peel adhesion retention of at least 40 percent after exposure to 95% relative humidity at 50° C. for 1 week."
  ],
  "description_excerpt": "1. Field of the Invention\n\nThis disclosure relates to polymer resins and, in particular, to adhesion stabilized polymer sheets suitable for use in polymer interlayers, including those utilized in multiple layer panels.\n\n2. Description of Related Art\n\nPolyvinyl butyral (PVB) is often used in the manufacture of polymer sheets that can be used as interlayers in multiple layer panels, including, for example, light-transmitting laminates such as safety glass. PVB is also used in photovoltaic solar panels to encapsulate the panels which are used to generate electricity for commercial and residential applications.\n\nThe term “safety glass” generally refers to a transparent laminate that includes at least one polymer sheet, or interlayer, disposed between two rigid substrates, such as, for example, two sheets of glass. Safety glass is often used as a transparent barrier in architectural and automotive applications, and one of its primary functions is to absorb energy resulting from impact and to prevent objects from passing through the laminate. Additionally, even when the applied force is sufficient to break the glass, the polymeric interlayer helps keep the glass bonded to the laminate, which prevents dispersion of sharp glass shards, thereby minimizing injury and damage to people or objects in the vicinity of the glass. Safety glass may also provide other benefits, such as a reduction in ultraviolet (UV) and/or infrared (IR) radiation, and it may also enhance the aesthetic appearance of window openings through addition of color, texture, and the like.",
  "cpc": [
    "B29D 7/01",
    "B05D 1/02",
    "B05D 1/18",
    "B29C 37/0025",
    "B29C 47/0004",
    "B29C 48/0021",
    "B29C 48/0022",
    "B29C 48/022",
    "B29C 48/08",
    "B29C 48/154",
    "B29C 48/21",
    "B29K 2031/04",
    "B32B 15/082",
    "B32B 17/10036",
    "B32B 17/10688",
    "B32B 17/10761",
    "B32B 27/08",
    "B32B 27/306",
    "B32B 27/365",
    "B32B 7/10",
    "B32B 9/005",
    "B32B 9/045",
    "C08F 118/10",
    "C08G 77/14",
    "C08G 77/26",
    "C08J 2329/14",
    "C08J 2483/06",
    "C08J 2483/08",
    "C08J 7/0427",
    "C08L 29/14",
    "C09D 183/00",
    "C09D 183/06",
    "C09D 183/08"
  ],
  "ipc": [
    "B05D 1/02",
    "B05D 1/18",
    "B29C 37/00",
    "B29D 7/01",
    "C08F 118/10",
    "C09D 183/00"
  ],
  "assignees": [
    "Solutia Inc"
  ],
  "inventors": [
    "Weihong Cui",
    "Steven V. Haldeman",
    "Francois Andre Koran",
    "Pu Zhang"
  ],
  "filing_date": "2014-12-08",
  "publication_date": "2016-07-05",
  "grant_date": "2016-07-05",
  "priority_date": "2014-12-08",
  "application_number": "US-201414562809-A",
  "family_id": "56093691",
  "cited_by_count": 15,
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}