Pressure-sensitive adhesives including expandable graphite

Patent metadata

Field	Value
Publication number	US-9688887-B2
Application number	US-201514615482-A
Country	US
Kind code	B2
Filing date	Feb 6, 2015
Priority date	Nov 7, 2012
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

A building material comprising a substrate layer and a pressure-sensitive adhesive layer, where the pressure-sensitive adhesive layer includes expandable graphite.

First claim

What is claimed is:

1. A composite comprising:
i. a polymeric sheet;
ii. a layer of pressure-sensitive adhesive, where the layer of pressure-sensitive adhesive includes first and second planar surfaces, and where the first planar surface of the pressure-sensitive adhesive layer is fixedly attached to the polymeric sheet;
iii. concentrated region of expandable graphite, where the concentrated region of expandable graphite is at or proximate to the second planar surface of the pressure-sensitive adhesive, and where the concentrated region of expandable graphite is discontinuous to thereby allow the pressure-sensitive adhesive to be exposed; and
iv. a release liner or film removably attached to the second planar surface of the pressure-sensitive adhesive.

2. The composite of claim 1 , where said layer of pressure-sensitive adhesive includes a planar region that is substantially devoid of expandable graphite.

3. The composite of claim 1 , where said concentrated planar region of expandable graphite has a thickness of from about 10 μm to about 3 mm.

4. The composite of claim 1 , where said concentrated planar region of expandable graphite is proximate to the release film relative to the polymeric sheet.

5. The composite of claim 1 , where the polymeric sheet includes a thermoplastic sheet.

6. The composite of claim 1 , where the polymeric sheet includes a thermoset sheet.

7. The composite of claim 1 , where the concentrated region of expandable graphite is formed by dropping expandable graphite on to the second planar surface of the pressure-sensitive adhesive.

8. The composite of claim 7 , where the expandable graphite is at least partially embedded within the pressure-sensitive adhesive layer.

9. The composite of claim 8 , where the concentrated region of expandable graphite is partially dispersed within said pressure-sensitive adhesive layer to form a concentration gradient whereby the concentration of the expandable graphite within the pressure-sensitive adhesive layer moves from a region of maximum concentration proximate to the second planar surface of the adhesive layer to a region of minimum concentration at the first planar surface of the adhesive layer.

10. A composite prepared by a process comprising:
i. providing a layer of pressure-sensitive adhesive; and
ii. dropping expandable graphite on to the layer of pressure-sensitive adhesive to thereby form a composite comprising
a polymeric sheet;
b. the layer of pressure-sensitive adhesive, where the layer of pressure sensitive adhesive includes first and second planar surfaces, and where the first planar surface of the pressure-sensitive adhesive layer is fixedly attached to the polymeric sheet;
c. the dropped expandable graphite in a concentrated region, where the concentrated region of expandable graphite is at or proximate to the second planar surface of the pressure-sensitive adhesive, and where the concentrated region of expandable graphite is discontinuous to thereby allow the pressure-sensitive adhesive to be exposed; and
d. a release linear or film removably attached to the second planar surface of the pressure-sensitive adhesive.

11. The composite of claim 10 , where adhesive forces from the pressure-sensitive adhesive fixedly secure the polymeric sheet thereby sandwiching the expandable graphite between the polymeric sheet and the pressure-sensitive adhesive.

Assignees

• Firestone Building Prod Co Llc

Inventors

• Zhou Wensheng
• Hubbard Michael J
• Carr Joseph

Classifications

• Y10T442/2648

  Coating or impregnation is specified as an intumescent material · CPC title

• Y10T428/30

  Self-sustaining carbon mass or layer with impregnant or other layer · CPC title

• Y10T428/2883

  including addition polymer of diene monomer [e.g., SBR, SIS, etc.] · CPC title

• Y10T428/2878

  including addition polymer from unsaturated monomer · CPC title

• Y10T428/2848

  Three or more layers · CPC title