Tape joint compound

Patent metadata

Field	Value
Publication number	US-9683094-B2
Application number	US-201213718085-A
Country	US
Kind code	B2
Filing date	Dec 18, 2012
Priority date	Dec 20, 2011
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

An aqueous tape joint compound including: an inorganic filler; an emulsion polymer binder; cellulose ether thickener; water; and from 0.01 to 1.3% by weight based on the weight of the aqueous joint compound, water-soluble polymer or salts thereof, the water-soluble polymer selected from the group consisting of (a) polymer consisting essentially of, as polymerized units, from 50% to 100%, by weight based on the weight of the polymer, acrylic acid, and from 0% to 50%, by weight based on the weight of the polymer, second monoethylenically unsaturated acid monomer, (b) diisobutylene-maleic anhydride polymer, and (c) mixtures thereof; the water-soluble polymer having a weight average molecular weight of from 1500 to 75,000 and a calculated Tg of from 80° C. to 250° C.; the aqueous tape joint compound being substantially free from calcium sulfate hemihydrate is provided.

First claim

What is claimed is:

1. An aqueous tape joint compound comprising: an inorganic filler; from 0.5 to 4% by weight as solid polymer based on the weight of said aqueous joint compound of an emulsion polymer binder; cellulose ether thickener; water; and from 0.01 to 1.3% by weight based on the weight of said aqueous joint compound, water-soluble polymer or salts thereof, said water-soluble polymer selected from the group consisting of (a) polymer consisting essentially of, as polymerized units, from 50% to 100%, by weight based on the weight of said polymer, acrylic acid, and from 0% to 50%, by weight based on the weight of said polymer, second monoethylenically unsaturated acid monomer, (b) diisobutylene-maleic anhydride polymer, and (c) mixtures thereof;
said water-soluble polymer having a weight average molecular weight of from 1500 to 75,000 and a calculated Tg of from 80° C. to 250° C.; and
wherein said aqueous tape joint compound is substantially free from calcium sulfate hemihydrate.

2. The aqueous tape joint compound of claim 1 wherein said water-soluble polymer has a weight average molecular weight of from 1700 to 50,000.

3. The aqueous tape joint compound of claim 1 wherein said water-soluble polymer consists essentially of polyacrylic acid.

4. The aqueous tape joint compound of claim 1 having a Braebender viscosity of from 400 to 800 BU.

5. A method for forming an aqueous tape joint compound comprising admixing an inorganic filler; from 0.5 to 4% by weight as solid polymer based on the weight of said aqueous joint compound of an emulsion polymer binder; cellulose ether thickener; water; and from 0.01 to 1.3% by weight based on the weight of said aqueous joint compound, water-soluble polymer or salts thereof, said water-soluble polymer selected from the group consisting of (a) polymer consisting essentially of, as polymerized units, from 50% to 100%, by weight based on the weight of said polymer, acrylic acid, and from 0% to 50%, by weight based on the weight of said polymer, second monoethylenically unsaturated acid monomer, (b) diisobutylene-maleic anhydride polymer, and (c) mixtures thereof;
said water-soluble polymer having a weight average molecular weight of from 1500 to 75,000 and a calculated Tg of from 80° C. to 250° C.; and
wherein said tape joint compound is substantially free from calcium sulfate hemihydrate.

6. The method of claim 5 wherein said water-soluble polymer is provided in solid powder form.

7. A method for providing a monolithic surface comprising
(a) providing a first planar substrate having a first edge;
(b) abutting a second edge of a second planar substrate, thereby forming a joint;
(c) applying the aqueous tape joint compound of any of claims 1 - 4 to the joint; and
(d) allowing the aqueous tape joint compound to dry.

8. The method according to claim 7 further comprising applying a joint tape to said joint prior to step (c) or embedded into the aqueous tape joint compound prior to step (d).

Assignees

• Rohm & Haas
• Dow Global Technologies Llc

Inventors

• Heulings Iv Harry R
• Hyman Larry N

Classifications

• C08L33/02

  Homopolymers or copolymers of acids; Metal or ammonium salts thereof · CPC title

• C08L1/28 Primary

  Alkyl ethers · CPC title

• C04B2111/1018

  Gypsum free or very low gypsum content cement compositions · CPC title

• C04B2111/00672

  Pointing or jointing materials · CPC title

• C04B2103/0065

  Polymers characterised by their glass transition temperature (Tg) · CPC title