Patent number: 7294189
Abstract: An emulsion comprising water as the continuous phase, a wax as the discontinuous phase, an emulsifier and a preservative having the general structure: wherein R1 can be a heterocycle containing nitrogen and sulfur, such as thiazolyl, isothiazolyl, or thiadiazolyl, which can optionally be substituted with C1–C6 alkyl; R2 can be hydrogen or C1–C6 alkyl, specifically hydrogen; n is 0, 1, 2, or 3; each instance of R3 can independently be hydrogen, C1–C6 alkyl, phenoxy, C1–C6 alkoxy, halo, amino, C1–C6 alkylamino, di C1–C6 alkyl amino, imidazolyl, thiazolyl, isothiazolyl, thiadiazolyl, thienyl, furyl, pyrryl, naphthyl, phenyl, halophenyl, C1–C6 alkyl phenyl, or C1–C6 alkoxyphenyl. The preservative may be added to the emulsion after the emulsion is formed. The emulsion can be incorporated into a gypsum product such as gypsum board or gypsum wood fiber board. The gypsum product may be made by forming a slurry containing gypsum, water, and the emulsion into a solid product.
Type:
Grant
Filed:
September 2, 2005
Date of Patent:
November 13, 2007
Assignee:
Hexion Specialty Chemicals, Inc.
Inventor:
Steven Wantling