IP Library › Granted Patent US 7,070,648
Granted Patent B1
US 7,070,648 · App. 11/153,966 · Granted Jul 4, 2006

Preparation of gypsum compositions

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Quick Facts
Patent No.
US 7,070,648
App. No.
11/153,966
Granted
Jul 4, 2006
Kind
B1
Abstract

A gypsum composition containing a sulfonate-containing comb-branched copolymer is disclosed. The sulfonate-containing comb-branched copolymer comprises recurring units of a polyether macromonomer, an acrylic monomer, and a sulfonate monomer. The sulfonate-containing comb-branched copolymer not only increases the fluidity of gypsum slurry but also has reduced retardation on the gypsum setting.

Claims (15)

1. A gypsum composition comprising a gypsum and an aqueous solution of a sulfonate-containing comb-branched copolymer that comprises recurring units of a polyether macromonomer, an acrylic monomer, and a sulfonate monomer.

2. The composition of claim 1 wherein the gypsum is derived from calcium sulfate hemihydrate.

3. The composition of claim 1 wherein the polyether macromonomer is selected from the group consisting of poly(propylene glycol) acrylates and methacrylates, poly(ethylene glycol) acrylates and methacrylates, acrylates and methacrylates of oxyethylene and oxypropylene block and random copolymers, and mixtures thereof.

4. The composition of claim 1 wherein the polyether macromonomer is an acrylate or methacrylate of an oxyethylene and oxypropylene copolymer.

5. The composition of claim 1 wherein the polyether macromonomer has a number average molecular weight within the range of 500 to 10,000.

6. The composition of claim 1 wherein the polyether macromonomer has a number average molecular weight within the range of 1000 to 5000.

7. The composition of claim 1 wherein the macromonomer has a molecular weight distribution less than 2.

8. The composition of claim 1 wherein the acrylic monomer is selected from the group consisting of methacrylic acid and its sodium, potassium, and ammonium salts.

9. The composition of claim 1 wherein the sulfonate monomer is selected from the group consisting of 2-acrylamido-2-methylpropanesulfonic acid, styrene sulfonic acid, their sodium, potassium, and ammonium salts, and mixtures thereof.

10. The composition of claim 1 wherein the sulfonate-containing comb-branched copolymer is a copolymer of an acrylate or methacrylate of an oxyethylene and oxypropylene copolymer, methacrylic acid, and 2-acrylamido-2-methylpropanesulfonic acid.

11. The composition of claim 10 wherein the sulfonate-containing comb-branched copolymer is neutralized with a neutralizing agent selected from the group consisting of sodium hydroxide, ammonium, and calcium hydroxide.

12. The composition of claim 1 wherein the sulfonate-containing comb-branched copolymer is a copolymer of an acrylate or methacrylate of an oxyethylene and oxypropylene copolymer, methacrylic acid, and styrene sulfonic acid.

13. The composition of claim 12 wherein the sulfonate-containing comb-branched copolymer is neutralized with a neutralizing agent selected from the group consisting of sodium hydroxide, ammonium, and calcium hydroxide.

14. A method of for making the gypsum composition of claim 1 , said method comprising mixing water, a gypsum, and a sulfonate-containing comb-branched copolymer that comprises recurring units of a polyether macromonomer, an acrylic monomer, and a sulfonate monomer.

15. A gypsum wallboard made from the composition of claim 1 .

Assignments (10)
RELEASE OF SECURITY INTEREST Recorded May 5, 2010
From: CITIBANK, N.A., AS COLLATERAL AGENT
To: LYONDELL CHEMICAL TECHNOLOGY, L.P.; EQUISTAR CHEMICALS, LP
Reel/Frame 024337/0705 →
RELEASE OF SECURITY INTEREST Recorded May 5, 2010
From: CITIBANK, N.A., AS COLLATERAL AGENT
To: LYONDELL CHEMICAL TECHNOLOGY, L.P.; EQUISTAR CHEMICALS, LP
Reel/Frame 024337/0856 →
CORRECTIVE ASSIGNMENT TO CORRECT PATENT NUMBER 6,214,598 ERRONEOUSLY RECORDED AT REEL 021590, FRAME 0234. Recorded Oct 17, 2008
From: LYONDELL CHEMICAL TECHNOLOGY, LP.
To: COATEX SAS
Reel/Frame 021691/0913 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 25, 2008
From: LYONDELL CHEMICAL TECHNOLOGY, L.P.
To: COATEX SAS
Reel/Frame 021590/0234 →
PARTIAL RELEASE OF LYONDELL CHEMICAL TECHNOLOGY, L.P. PATENT SECURITY AGREEMENT Recorded May 23, 2008
From: CITIBANK, N.A., AS COLLATERAL AGENT
To: LYONDELL CHEMICAL TECHNOLOGY, L.P.
Reel/Frame 020995/0187 →
GRANT OF SECURITY INTEREST IN UNITED STATES PATENTS AND PATENT APPLICATIONS Recorded Mar 26, 2008
From: BASELL POLYOLEFINE GMBH; ARCO CHEMICAL TECHNOLOGY L.P.; ARCO CHEMICAL TECHNOLOGY, INC.; ATLANTIC RICHFIELD COMPANY; BASELL NORTH AMERICA, INC.; EQUISTAR CHEMICALS. LP.; LYONDELL CHEMICAL COMPANY; LYONDELL CHEMICAL TECHNOLOGY, L.P.; LYONDELL PETROCHEMICAL COMPANY; NATIONAL DISTILLERS AND CHEMICAL CORPORATION; OCCIDENTAL CHEMICAL CORPORATION; OLIN CORPORATION; QUANTUM CHEMICAL CORPORATION; BASELL POLYOLEFIN GMBH
To: CITIBANK, N.A., AS COLLATERAL AGENT
Reel/Frame 020704/0562 →
RELEASE OF LYONDELL CHEMICAL TECHNOLOGY, L.P. PATENT SECURITY AGREEMENT Recorded Mar 20, 2008
From: JPMORGAN CHASE BANK, N.A.
To: LYONDELL CHEMICAL TECHNOLOGY, L.P.
Reel/Frame 020679/0063 →
SECURITY AGREEMENT Recorded Sep 15, 2006
From: LYONDELL CHEMICAL TECHNOLOGY, L.P.
To: JPMORGAN CHASE BANK N.A., AS ADMINISTRATIVE AGENT
Reel/Frame 018260/0306 →
CHANGE OF NAME Recorded Jun 27, 2005
From: ARCO CHEMICAL TECHNOLOGY, L.P.
To: LYONDELL CHEMICAL TECHNOLOGY, L.P.
Reel/Frame 016206/0001 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 16, 2005
From: SCHWARTZ, STEVEN A.; LIOTTA, FRANK J. JR.; BARSA, EDWARD A.
To: LYONDELL CHEMICAL TECHNOLOGY, L.P.
Reel/Frame 016699/0694 →