USE AS A THICKENING AGENT OF SALINE AQUEOUS FORMULATIONS OF A WATER-SOLUBLE ACRYLIC COPOLYMER, WHICH IS CROSSLINKED AND HYDROPHOBICALLY MODIFIED
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United States of America Patent
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Issued Date -
May 12, 2011
app pub date -
Jun 9, 2009
filing date -
Jul 3, 2008
priority date (Note) -
Abandoned
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Abstract
The invention consists in the use, as a thickening agent of an aqueous formulation which is, notably, salt-rich, of a water-soluble or alkali-soluble copolymer consisting of (by weight): a) 30% to 45% of (meth)acrylic acid, b) 50% to 60% of acrylamide and/or of N-methylol and/or of an acrylic ester, c) 2% to 10% of a hydrophobic monomer of formula R.sub.1--(R.sub.2O).sub.m--R.sub.3, in which: R.sub.1 designates a polymerisable unsaturated group, R.sub.2O designates an alkylene oxide group having 1 to 6 carbon atoms, m is an integer of between 20 and 50, R.sub.3 designates a linear alkyl chain comprising at least 16 and at most 26 carbon atoms, d) 0.1% to 4% of at least one cross-linking agent, which is preferentially ethyleneglycoldimethacrylate (EDMA).
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