Drywall tape and joint

• US 7,141,284 B2
• Filed: 03/20/2002
• Issued: 11/28/2006
• Est. Priority Date: 03/20/2002
• Status: Expired due to Term

• Current Assignee: Saint-Gobain Adfors Canada Ltd.
• Original Assignee: Saint-Gobain Technical Fabrics Canada Limited (Compagnie de Saint-Gobain SA)
• Inventors: Newton, Mark Joseph, Roberts, David Geraint
• Primary Examiner(s): Pyon, Harold
• Assistant Examiner(s): Nordmeyer, Patricia L.
• Application Number:
  US10/102,061
• Publication Number:
  US 20030181114A1
• Time in Patent Office: 1,714 Days
• Field of Search: 428/40.1, 428/40.4, 428/40.5, 428/343
• US Class Current: 428/40.1
• CPC Class Codes: C09J 2400/263 in the substrate
• CPC Class Codes: C09J 7/21 Paper; Textile fabrics
• CPC Class Codes: E04F 13/04 Bases for plaster sub-ceilings with plaster-carrying means E04B9/06
• CPC Class Codes: E04F 13/042 Joint tapes
• CPC Class Codes: E04F 13/047 Plaster carrying meshes
• CPC Class Codes: Y10T 428/14 Layer or component removable to expose adhesive
• CPC Class Codes: Y10T 428/1419 Wax containing
• CPC Class Codes: Y10T 428/197 with noncoplanar reinforcement
• CPC Class Codes: Y10T 428/28 Web or sheet containing structurally defined element or component and having an adhesive outermost layer
• CPC Class Codes: Y10T 442/2738 Coating or impregnation intended to function as an adhesive to solid surfaces subsequently associated therewith

Abstract

Drywall tapes, drywall joints and methods for their construction are provided by this invention. The drywall tape of this invention includes a web of glass fibers and a coating disposed over a portion of the glass fibers. The coating includes a resinous binder which is at least partially soluble or dispersible in joint compound. The resinous binder is capable of forming an adhesive bond with the joint compound when set.

Claims

1. A drywall joint comprising:

a seam region formed by drywall;

a drywall tape covering said seam region, said drywall tape comprising a web of high strength fibers having a resinous coating thereon, wherein said resinous coating faces toward a water containing joint compound and is soluble therein, and wherein said resinous coating forms an adhesive bond with said joint compound when dried;

wherein said fibers are embedded in said joint compound, and said resinous coating is solubilized by said joint compound;

wherein said joint compound is dried; and

wherein an adhesive bond is formed by said resinous coating with said joint compound which resists pull out of said fibers from said joint compound.

2. The drywall joint of claim 1 wherein said resinous coating comprises one or more of the group selected from:

polyvinyl alcohol, polyvinyl acetate, polystyrene, polyvinylchloride, polyacrylate, ethylene vinyl acetate co-polymer, vinyl-acrylic co-polymer, styrene butadiene, acrylic polymer, starch, protein glues, soy protein, animal glue, gelatin, vegetable-based glue, gum, mucilage, inorganic compound, cementitious material and copolymers and combinations thereof.

3. The drywall joint of claim 1 wherein said web of fibers comprises;

a non-woven fabric, woven fabric, knitted fabric, mat or scrim.

4. The drywall joint of claim 1 further comprising:

a pressure sensitive adhesive on said drywall tape adhering said drywall tape to said drywall.

5. The drywall joint of claim 1 wherein said resinous coating comprises polyvinyl acetate and a water vapor resistant blocking agent dispersible when contacted with liquid water in the joint compound.

6. The drywall joint of claim 5 wherein said blocking agent comprises a waxy substance.

7. The drywall joint of claim 1 wherein a tensile strength of said adhesive bond is greater than a tensile strength of the joint compound itself.

8. The drywall joint of claim 1 wherein said drywall joint has an average load to first crack according to a test under industry specification ASTM C 474, which is at least 16% greater than that for a drywall joint without said resinous coating.

9. The drywall joint of claim 1, further comprising:

a feathering portion of said joint compound.

10. A finished drywall seam region or repair region, comprising:

an unfinished seam region or repair region formed by drywall;

a drywall tape comprising a web of high strength fibers having thereon a resinous coating, wherein the resinous coating is separate from a water containing joint compound and, further wherein, the resinous coating is soluble in water, and faces toward a water containing joint compound and forms an adhesive bond with the water containing joint compound when dried;

wherein said fibers are embedded in said water containing joint compound, and said resinous coating is solublized by said water containing joint compound;

wherein said resinous coating is dried, together with the water containing joint compound; and

wherein an adhesive bond is formed by said resinous coating with said joint compound which resists pull out of said fibers from said joint compound.

11. The finished drywall seam or repair region of claim 10, wherein said resinous coating comprises polyvinyl acetate and wax as a blocking agent.

12. The finished drywall seam region or repair region of claim 10 further comprising:

a pressure-sensitive adhesive on said web to adhere said drywall tape to the drywall.

13. The finished drywall seam region or repair region of claim 10 wherein said resinous coating comprises one or more of the group selected from:

polyvinyl alcohol, polyvinyl acetate, polystyrene, polyvinylchloride, polyacrylate, ethylene vinyl acetate co-polymer, vinyl-acrylic co-polymer, styrene butadiene, acrylic polymer, starch, protein glues, soy protein, animal glue, gelatin, vegetable-based glue, gum, mucilage, inorganic compound, cementitious material and copolymers and combinations thereof.

14. The finished drywall seam region or repair region of claim 10 wherein said web of fibers comprises;

a non-woven fabric, woven fabric, knitted fabric, mat or scrim.

15. The finished drywall seam region or repair region of claim 10 further comprising:

a pressure sensitive adhesive on said drywall tape to adhere said drywall tape to said drywall.

16. The finished drywall seam region or repair region of claim 10 wherein said resinous coating comprises polyvinyl acetate and a water vapor resistant blocking agent dispersible when contacted with liquid water in the water containing joint compound.

17. The finished drywall seam region or repair region of claim 16 wherein said blocking agent comprises wax.

18. The finished drywall seam region or repair region of claim 10 wherein a tensile strength of said adhesive bond is greater than that of the joint compound itself.

19. A method of making a drywall joint comprising:

applying a water containing joint compound to embed a drywall tape covering a seam region formed by drywall;

said drywall tape comprising, a web of high strength fibers having thereon a resinous coating facing toward said water containing joint compound, wherein said resinous coating and said fibers are embedded in said water containing joint compound, and wherein said resinous coating is solublized by said water containing joint compound, to form an adhesive bond with said joint compound when dried; and

drying said joint compound and said resinous coating to form an adhesive bond between said resinous coating and said joint compound resisting pull out of said fibers from said joint compound.

20. The method of claim 19 wherein said drywall joint has an average load to first crack according to a test under industry standard specification ASTM C 474, which is at least 16% greater than that for a drywall joint without said resinous coating.

21. The method of claim 19 further comprising:

adhering said drywall tape to said drywall by a pressure sensitive adhesive, prior to applying the water containing joint compound to embed the drywall tape.

22. The method of claim 19, further comprising:

applying a feathering portion of said joint compound.

23. The method of claim 19 wherein said resinous coating comprises one or more of the group selected from:

polyvinyl alcohol, polyvinyl acetate, polystyrene, polyvinylchloride, polyacrylate, ethylene vinyl acetate co-polymer, vinyl-acrylic co-polymer, styrene butadiene, acrylic polymer, starch, protein glues, soy protein, animal glue, gelatin, vegetable-based glue, gum, mucilage, inorganic compound, cementitious material and copolymers and combinations thereof.

24. The method of claim 19 wherein said web of fibers comprises:

a non-woven fabric, woven fabric, knitted fabric, mat, or scrim.

25. The method of claim 19 wherein said resinous coating comprises polyvinyl acetate and a vapor resistant blocking agent.

26. The method of claim 19 wherein a tensile strength of said adhesive bond is greater than a tensile strength of the joint compound itself.