Branched alkyl sulfate gypsum foamer

Patent metadata

Field	Value
Publication number	US-2018141014-A1
Application number	US-201615736693-A
Country	US
Kind code	A1
Filing date	Jun 14, 2016
Priority date	Jun 17, 2015
Publication date	May 24, 2018
Grant date	—

Abstract

A surfactant composition is disclosed comprising branched alkyl sulfate having 8 to 12 carbon atoms; optionally a linear alkyl sulfate having 8 to 12 carbon atoms; and optionally an alkyl ether sulfate having 8 to 13 carbon atoms. A gypsum slurry or gypsum board core is disclosed comprising gypsum, water, and a surfactant composition as described above. The foam voids in the core have a greater median diameter than foam voids made with corresponding linear alkyl sulfate. A method of controlling the median foam void diameter in a gypsum board is disclosed. A first foam water composition is provided comprising a linear alkyl sulfate surfactant. A second foam water composition is also provided comprising a branched alkyl sulfate surfactant. The proportions of the first and second foam water compositions employed in a gypsum composition are selected, or if desired changed, to provide the desired median foam void diameter.

First claim

1 . A surfactant composition comprising:
from 12 to 95 wt. % by total surfactant weight of a branched alkyl sulfate having the structure:
R 1 OSO 3 − + M 1 ,
in which R 1 is branched alkyl having from 8 to 12 carbon atoms and M 1 is a cation; from 0 to 88 wt. % by total surfactant weight of a linear alkyl sulfate having the structure:
R 2 OSO 3 − + M 2 ,
in which R 2 is linear alkyl having from 8 to 12 carbon atoms and M 2 is a cation; and from 0 to 30 wt. % by total surfactant weight of an alkyl ether sulfate having the structure:
R 3 (OCH 2 CH 2 ) y OSO 3 − + M 3
in which R 3 is branched alkyl or linear alkyl or a combination thereof having from 8 to 13 carbon atoms, y has an average value from 0.1 to 5, and M3 is a cation; in which M1, M2, and M3 are independently selected.

2 . The composition of claim 1 , comprising a weight ratio of
R 1 OSO 3 − + M 1 :R 2 OSO 3 − + M 2
of from at least 10:95 to at most 95:10.

3 . The composition of claim 2 , in which the weight ratio is from at least 15:85 to at most 85:15.

4 - 9 . (canceled)

10 . The composition of claim 1 , in which R 1 has from at least 9 to at most 11 carbon atoms.

11 - 15 . (canceled)

16 . The composition of claim 1 , in which R 2 has from at least 9 to at most 11 carbon atoms.

17 - 21 . (canceled)

22 . The composition of claim 1 , in which R 3 has from at least 9 to at most 12 carbon atoms.

23 - 29 . (canceled)

30 . The composition of claim 1 , in which each M is independently selected from sodium and ammonium.

31 . The composition of claim 1 , in which y has an average value from 0.4 to 3.

32 - 39 . (canceled)

Assignees

• Stepan Co

Inventors

• Mirous Brian K

Classifications

• C04B24/16 Primary

  Sulfur-containing compounds · CPC title

• C04B2103/40

  Surface-active agents, dispersants · CPC title

• C04B40/0039

  Premixtures of ingredients · CPC title

• B01F17/0085

  Operations & Transport · mapped topic

• C04B28/14 Primary

  containing calcium sulfate cements {(gypsum-paper plates E04C)} · CPC title