Perfluorinated alkyl hydrophobe hydroxyalkylcellulose associative thickeners
AssigneeAqualon Company
InventorsJohn D. Angerer, Thomas G. Majewicz, Makram H. Meshreki
Life of this patent
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Abstract
A purified hydroxyethylcellulose (HEC) or hydroxypropylcellulose (HPC) reacts with a perfluorinated alkyl glycidyl ether to produce an associative thickener wherein a fluorinated C.sub.8 chain is nearly as effective as a hydrocarbyl C.sub.16 straight chain hydrophobe. A preferred glycidyl ether is prepared by reacting a terminal hydroxyl of a perfluorinated surfactant with epichlorohydrin.
Claims13
An aqueous phase associative thickener, characterized in that the associative thickener is a hydroxyethylcellulose or hydroxypropylcellulose hydrophobically modified with a perfluorinated alkyl hydrophobe glycidyl ether having the following structure ##STR3## where n.sub.1 is selected from the group consisting of 0, 5-6 or 9-10,
- n.sub.2 is selected from the group consisting of 0 or 12-13 and
- R.sub.f is selected from the group consisting of F(CF.sub.2).sub.y where y is 7-8.
A process for preparing a perfluorinated alkyl hydroxyalkylcellulose for use as an aqueous phase associative thickener comprising the steps:
- (1) removing impurities to produce a high purity hydroxyalkylcellulose;
- (2) preparing a perfluorinated alkyl glycidyl ether;
- and
- (3) reacting the purified hydroxyalkylcellulose with the glycidyl either to produce a perfluorinated alkyl hydroxyalkylcellulose, said perfluorinated glycidyl ether having the structure ##STR4## where n.sub.1 is selected from the group consisting of 0, 5-6 or 9-10,
- n.sub.2 is selected from the group consisting of 0 or 12-13 and
- R.sub.f is selected from the group consisting of F(CF.sub.2).sub.y where y is 7-8.
An aqueous coating composition containing a thickening amount of the reaction product of purified hydroxyethylcellulose with the glycidyl ether of N-ethyl-N-2-hydroxyethyl perfluoroctanesulfonamide.
Dependencies are inferred from the claim text.