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US 5,393,456 AGranted
Composition for controlling silica and water soluble silicate deposition
AssigneeBetz Laboratories, Inc.
InventorsLibardo A. Perez, J. Michael Brown, Khac T. Nguyen
Life of this patent
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Abstract
A method for the inhibition of silica and silicate deposits on the internal surfaces of a water system consisting of adding to the water system a composition comprised of a blend of two water soluble copolymers. The first copolymer contains repeat units of maleic or acrylic acids and a phosphinic acid, or salt forms thereof. The second copolymer contains repeat units of acrylic acid and allyl hydroxy propyl sulfonate ether, or salt forms thereof.
Claims3
A composition for the control of silica or silicate deposits on the internal structural surfaces of a water system comprising
- I) a first copolymer, m, having the structure:
- ##STR2## wherein R.dbd.H or COOM, M is H or a water soluble cation, the molar ratio of repeat units a:b is from about 30:1 to 1:2 and the number average molecular weight is from about 150 to about 200,000 and
- II) a second copolymer, n, having the structure:
- ##STR3## wherein M is H or a water soluble cation, the molar ratio of repeat units x:y is about 3:1 and the number average molecular weight is from about 300 to about 20,000, wherein the ratio of m:n is from about 1:1.5 to 1:4, by weight.
1 more element
Dependencies are inferred from the claim text.