ethylenediamine. The diamines give a higher reactivity than monoamines and provide therefore a faster hardening that can lead to a harder film but less flexible film formation. 

[0159] In one embodiment aldimine is any Schiff base of the general formula RCH-NH or RCH-NR’ formed by condensation of an aldehyde with ammonia or a primary amine. Preferred aldimines are N-butyl-2-(1-ethylpentyl)-1, 3-oxazolidine or 3-Oxazolidineethanol ,2-(1-methylethyl)-, 3,3-carbonate. 

[0160] In one embodiment, the epoxy resin and polyure› thane resins are both existing in the pressurized can. The epoxy resin is selected from the group consisting ofbisphe› nol A epoxy resin, bisphenol F epoxy resin, novolac epoxy resin, aliphatic epoxy resin, glycidylamine epoxy resin, and mixtures thereof. 

[0161] In one embodiment, the co-existing epoxy resin is bisphenol A epoxy resin. The bisphenol A epoxy resins are formed from reacting epichlorohydrin with bisphenol A. For example, the simplest bisphenol A epoxy resin is formed from reacting two moles of epichlorohydrin with one mole of bisphenol A to form bispheno) A diglycidyl ether (DGEBA). Increasing the ratio of bisphenol A to epichlo› rohydrin during manufacture produces higher molecular weight polyethers with epoxide groups (also referred to as glycidyl groups). This binder is particularly suitable for regular conditions. It has good water resistance and chemical resistance, and it provides flexible coatings. 

[0162] In one embodiment, the co-existing epoxy resin is bisphenol F epoxy resin. 

[0163] The bisphenol F epoxy resins are formed from reacting epichlorohydrin with bisphenol F in similar way to bisphenol A. This binder has better chemical resistance compared to bisphenol A epoxy resins, especially at low and high pH ranges. 

[0164] In one embodiment, the co-existing epoxy resin is novolac epoxy resin. The novolac epoxy resins are formed from reacting phenols with formaldehyde and subsequent glycidylation with epichlorohydrin. Examples of particu› larly suitable novolac epoxy resins are epoxy phenol novol› acs (EPN) and epoxy cresol novolacs (ECN). These provide high chemical resistance together with a high temperature resistance. The formed films are less flexible when the epoxy group content is increased. 

[0165] In one embodiment, the co-existing epoxy resin is aliphatic epoxy resin. The aliphatic epoxy resins comprise glycidyl epoxy resins and cycloaliphatic epoxides. These materials may act as dilutants, as well. They are preferably applied as auxiliary resins to the above discussed primary resms. 

[0166] In one embodiment, the co-existing epoxy resin is glycidyl epoxy resin. The glycidyl epoxy resins are formed by reaction of epichlorohydrin with aliphatic alcohols or polyols to give glycidyl ethers or aliphatic carboxylic acids to give glycidyl esters. Examples of preferred glycidyl epoxy resins which can be used in preparing epoxy modified polyurethane paints or epoxy-polyurethane-hybrid paints are dodecanol glycidyl ether, diglycidyl ester of hexahy› drophthalic acid, and trimethylolpropane triglycidyl ether. The purpose of these chemicals is to provide a reactive dilutant for its low viscosity. Preferably, they are used in combination with the primary resins as auxiliary binders to balance the reaction taking place. Typically, their reaction rate is clearly lower to the primary resins. In one embodi› ment, the co-existing epoxy resin is cycloaliphatic epoxide 

which can be used in preparing epoxy modified polyure› thane paints or epoxy-polyurethane-hybrid paints. The cycloaliphatic epoxides contain at least one cycloaliphatic ring in the molecule to which an oxirane ring is fused. The cyclo-aliphatic epoxides are formed by reaction of cyclo› olefins with a peracid, such as peracetic acid. An example of preferred cycloaliphatic epoxide is 3,4-epoxycyclohexylm› ethyl-3,4-epoxycyclohexane carboxylate. The purpose of these chemicals is to provide a reactive dilutant for its low viscosity. The reaction rate is lower to the primary resins. 

[0167] In one embodiment, the co-existing epoxy resin is glycidylamine epoxy resin which can be used in preparing epoxy modified polyurethane paints or epoxy-polyurethane› hybrid paints. The glycidylamine epoxy resins are formed when aromatic amines are reacted with epichlorohydrin. Examples of preferred glycidylamine epoxy resins are tri› glycidyl-p-aminophenol and N,N,N,N-tetraglycidyl-4,4- methylenebis benzylamine. These provide a very high tem› perature resistant coating and very high reactivity, as there as many epoxy groups in the chain. 

[0168] In one embodiment a combination of selected different types of primary and auxiliary resins, and optional solvents, is used to ensure linear and steady evaporation of the solvents, and to enhance the forming of the coating and exhibiting desired properties. 

[0169] A wide range of different epoxy resins, such as the ones mentioned above, are produced industrially and are commercially available. They can all be used the present invention to produce polyurethane-epoxy paints. 

[0170] The epoxide content is a characteristic feature of the epoxy resins which can be used alongside of the poly› urethane resin. The epoxide content is commonly expressed as epoxide number, which is the number of epoxide equiva› lents in 1 kg of resin (Eq./kg), or as the equivalent weight, which is the weight in grams of resin containing 1 mole equivalent of epoxide (g/mol). One measure may be con› verted to another with formula: 

Equivalent Weight (g/mol)~l000/epoxide number (Eq./kg) 

[0171] Preferably, the epoxy resin of the present invention is selected from a group consisting of bisphenol A epoxy resin, bisphenol F epoxy resin, epoxy phenol novolacs (EPN), epoxy cresol novolacs (ECN), dodecanol glycidyl ether, diglycidyl ester of hexahydrophthalic acid, trimethyl› olpropane triglycidyl ether, 3,4-epoxycyclohexylmethyl-3, 4-epoxycyclohexane carboxylate, triglycidyl-p-aminophe› nol, N,N,N,N-tetraglycidyl-4,4-methylenebis benzylamine, or mixtures thereof. More preferably, the epoxy resin of the present invention is selected from bisphenol A epoxy resin or bisphenol F epoxy resin. The characteristics of these two types of binders are the most suitable for the aimed products. They further enable the use of reactive dilutants of high temperature resistant type. 

[0172] In one embodiment, the epoxy resin has an Equiva› lent Weight from 100 to 1500 g/eq, preferably from 120 to 700 g/eq, and more preferably from 450 to 500 g/eq. 

[0173] In another embodiment the epoxy resin is an epoxy with an epoxy group content of 2000-2220 mmol/kg and an epoxy molar mass of 450-500 g/Eq. 

[017 4] In one embodiment the amount of epoxy by weight of the formulation is from 18 to 30%. Preferably, the amount of epoxy by weight of the formulation is from 15 to 30%. Most preferably, the amount of epoxy by weight of the formulation is from 15 to 23% 

