Patent · US Expired

Process for the production of a pourable phosphate-free foam-inhibiting preparation

US5318718A · kind A · utility

6Cited by

4References

16Claims

0Family size

Assignee

Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

Wolfgang Seiter · Neuss, DE
Herbert Reuter · Hilden, DE
Edmund Schmadel · Leichlingen, DE

Key dates

Filing date	Aug 17, 1992
Grant date	Jun 7, 1994
Priority date	—
Expiry date	Aug 17, 2012

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC11D3/373
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

A process for the production of pourable foam inhibitor granules comprising forming an aqueous solution of a mixture of an alkali metal carboxymethyl cellulose and a nonionic cellulose ether and maintaining the aqueous solution at slightly elevated temperature until the viscosity is at least 60% of the viscosity obtained by complete swelling of the solution, adding a water insoluble foam inhibitor and a phosphate-free mixture of at least two of an alkali metal silicate, an alkali metal carbonate and an alkali metal sulfate into the aqueous mixture which is then spray-dried to form the pourable foam inhibitor granules. The invention also relates to the pourable foam inhibitor granules produced by the above process.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.