Perfluoropolyether compounds as additives in formulations
AssigneeAusimont S.p.A.
InventorsGabriella Carignano, Mattia De Dominicis
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Abstract
Processes for wood treatment using mono- and bifunctional perfluoropolyether compounds as additives in formulations for the wood treatment, said perfluoropolyether compounds having the structures: Rf—O—CFY—L—W (C) W—L—YFC—O—RfO—CFY—L—W (D) wherein: L is an organic group selected from —CH2—(OCH2CH2)n—, —CO—NR′—, with R′═H or C1-C4 alkyl group; n=0-8; Y═F, CF3; W is selected from C1-C50 alkyl groups, optionally containing one or more ether O, C6-C50 aryl groups, C7-C50 alkyl-aryl or aryl-alkyl groups; Rf is a perfluoropolyether radical.
Claims14
A process for preparing impregnating, antivegetative, insecticidal, anti-mould and paint formulations for wood treatment, excluding formulations based on paraffin waxes dissolved in hydrocarbon solvents, by adding to said formulations mono- and bifunctional perfluoropolyether compounds, said method improving the following property combination of surfaces of the treated wood:
- hydro-repellence determined by depositing 5 μl of water/isopropanol mixture at two ratio by weight 60:40 and 30:70, and by subsequently determining the area of the drop;
- oil-repellence determined by depositing 10 μl if vaseline oil and by subsequently determining the area of the drop after 5, 10, 15 and 20 minutes;
- absence of change in a natural aspect of the wood;
- substantial maintenance of the properties conferred by formulations for wood treatment after addition;
- compatibility of the additive with formulations for wood so as to have substantially uniform oil- and hydro-repellence properties on the surface of the treated wood;
- wetting capacities;
- friction coefficient;
- said mono- and bifunctional perfluoropolyether compounds having the following structures:
- Rf—CFY—L—W (C)
- W—L—YFC—O—Rf—CFY—L—W (D)
- wherein:
- L is an organic group selected from —CH2—(OCH2CH2)n—,
- —CO—NR′—, with R′═H or C1-C4 alkyl group;
- n=0-8;
- Y═F, CF3;
- W is selected from C1-C50 alkyl groups, optionally containing one or more ether O, C6-C50 aryl groups, C7-C50 alkyl-aryl or aryl-alkyl groups;
- Rf has a number average molecular weight in the range 350-8,000, and it comprises repeating units having at least one of the following structures, statistically placed along the chain:
- (CFXO), (CF2CF2O), (CF2CF2CF2O), (CF2CF2CF2CF2O),
- (CR4R5CF2CF2O), (CF(CF3)CF2O), (CF2CF(CF3)O),
- wherein
- X═F, CF3;
- R4 and R5, equal to or different from each other, are selected from H, Cl, or perfluoroalkyl from 1 to 4 carbon atoms.
Dependencies are inferred from the claim text.