Anti-icing compositions containing thickener blend having polyacrylic acid and copolymer of acrylic acid and hydrophobic vinyl monomer
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United States of America Patent
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Jun 2, 1992
Grant Date -
N/A
app pub date -
Nov 19, 1990
filing date -
Nov 19, 1990
priority date (Note) -
Expired
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Abstract
Anti-icing compositions, such as used on aircraft wing surfaces, may be thickened using a blend of a polyacrylic acid and a copolymer of polyacrylic acid with a vinyl monomer, where the copolymer acts as a thickener modifier. The two polymers form a thickener blend. The polyacrylic acid may have a weight average molecular weight of from about 2,500,000 to about 3,500,000 and be slightly crosslinked with a diene monomer. The composition also contain an alkylene glycol component, such as propylene glycol, diethylene glycol and mixtures thereof. These compositions retain a high viscosity,even when diluted with water, and exhibit a highly pseudo plastic rheology indicating desirable flow off characteristics. A neutralizing agent to neutralize at least partially the carboxylic acid groups of the thickening blend is also preferably included.
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