# US 12,180,116 B2 · Alkyl sulfate / alkyl ether sulfate gypsum foamer

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,180,116 B2
- Document ID: US12180116B2
- Status: Granted
- Kind: B2
- Application number: 18/199,529
- Filed: 2023-05-19
- Published: 2023-09-28
- Granted: 2024-12-31
- Earliest claimed: 2017-04-06
- Assignees: Stepan Company; Saint-Gobain Placo
- Applicants: Stepan Company; Saint-Gobain Placo
- Inventors: Brian K. Mirous; Hamouda Jaffel
- Web page: https://patentgrep.com/patent/US12180116B2

## CPC

- C04B 24/16: Sulfur-containing compounds
- C04B 28/14: containing calcium sulfate cements {(gypsum-paper plates E04C)}
- C04B 38/106: {by adding preformed foams}
- C04B 40/0039: {Premixtures of ingredients}
- C08K 5/36: Sulfur-, selenium-, or tellurium-containing compounds {(C08K5/0091 takes precedence)}
- C08K 5/41: Compounds containing sulfur bound to oxygen
- C04B 2111/0062: {Gypsum-paper board like materials}
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

A surfactant composition is disclosed comprising a first alkyl sulfate surfactant, optionally a second alkyl sulfate surfactant, and optionally an alkyl ether sulfate. The first and second alkyl sulfate surfactants have Formula (1): R1—OSO3−+M1 (1) and the alkyl ether sulfate has Formula (2): R2—(OCH2CH2)yOSO3−+M2 (2) in which R1 and R2 are independently selected linear or branched alkyl or a combination thereof having from 6 to 14 carbon atoms, y has an average value from 0.1 to 5, and M1 and M2 are cations independently selected from sodium, calcium, ammonium, or a combination of two or all of these. Use of the composition as a foaming agent for gypsum slurries, and of the gypsum slurries for formation of gypsum boards, are disclosed.

## Claims

### Claim 1

A gypsum slurry comprising gypsum, water, and a surfactant composition comprising
from 97.5 to 99.5 wt. % by total surfactant weight of a linear or branched alkyl sulfate having the structure of Formula (1):
R1—OSO3−+M1 (1)
in which R1 is linear or branched alkyl having from 6 to 14 carbon atoms and M1 is a cation selected from sodium, calcium, ammonium, or a combination of two or all of these,
an average number of carbon atoms, nm, in R1 between 9 and 10, and
the following proportions by weight of species of Formula (1):
25% to 47% in which R1 is straight or branched C8H17;
38% to 55% in which R1 is straight or branched C10H21;
12% to 20% in which R1 is straight or branched C12H25;
and from 0.5 to 2.5 wt. % by total surfactant weight of a linear or branched alkyl ether sulfate having the structure of Formula (2):
R2—(OCH2CH2)yOSO3−+M2 (2)
in which R2 is branched alkyl or linear alkyl or a combination thereof having from 6 to 14 carbon atoms,
y has an average value from 0.1 to 5, and
M2 is a cation selected from sodium, calcium, ammonium, or a combination of two or all of these,
an average number of carbon atoms, nm, in R2 between 9 and 10, and
an average value of y from 0.5 to 2.5.

### Claim 2 (depends on 1)

A gypsum board comprising a core having multiple foam voids and facing sheets, the core having been formed from a gypsum slurry according to claim 1.