Patent ID: 6608138
Filing Date: 2003-08-19
Classification: B27K

Abstract:
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 &mgr;l 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 &mgr;l 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: Rfâ€”CFYâ€”Lâ€”Wâ€ƒâ€ƒ(C) Wâ€”Lâ€”YFCâ€”Oâ€”Rfâ€”CFYâ€”Lâ€”Wâ€ƒâ€ƒ(D) â€ƒwherein: L is an organic group selected from â€”CH2â€”(OCH2CH2)nâ€”, â€”COâ€”NRâ€²â€”, with Râ€²&boxH;H or C1-C4 alkyl group; n=0-8; Y&boxH;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), â€ƒwherein X&boxH;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.