Process for the production of a pourable phosphate-free foam-inhibiting preparation
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United States of America Patent
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Jun 7, 1994
Grant Date -
N/A
app pub date -
Aug 17, 1992
filing date -
Feb 15, 1990
priority date (Note) -
Expired
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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.
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