Dispersant and foaming agent combination
- Assignee
- Geo Specialty Chemicals Inc
- Inventors
- Arpad Savoly, Dawn P. Elko, Bennie Veal, James McCrary
- Jurisdiction
- United States (USPTO)
- Filed
- 2002-08-07
- Published
- 2004-08-10
- Priority
- 2002-08-07
The present invention provides a dispersant and foaming agent combination that is useful in the production of gypsum wallboard and other aqueous cementitious products. The dispersant in the combination according to the invention is a naphthalene sulfonate-aldehyde condensate alkali salt polymer having a weight average molecular weight of from about 17,000 to about 47,000. The alkali is preferably an alkali metal and/or an alkaline earth metal. The aldehyde is preferably formaldehyde. The foaming agent used in the combination according to the invention is a soap, preferably an alkali salt of an alkyl ether sulfate and/or an alkyl sulfate. The combination of a high molecular weight dispersant and a foaming agent produces a gypsum wallboard core effect that more efficiently entrains air (i.e., creates void space), thereby lowering overall board weight without detrimentally affecting strength.
A dispersant and foaming agent combination for use in the production of gypsum wallboard comprising: a naphthalene sulfonate-aldehyde condensate alkali salt polymer having a weight average molecular weight from about 17,000 to about 47,000; and a soap; wherein the aldehyde in the naphthalene sulfonate-aldehyde condensate alkali salt polymer is formaldehyde and the soap comprises a mixture of an alkyl sulfate and an alkyl ether sulfate.
Further claims, drawings, prosecution history and legal status: see the official record.
- [1]US 6,774,146 B2 — Dispersant and foaming agent combination — Google Patents · 2004-08-10