Patent ID: 6965007

Claim:
A composition comprising aliphatic isocyanates, at least partially blocked by at least two different blocking agents, one of the blocking agents reacting with the isocyanate functional group via an OH group and the other reacting with the isocyanate functional group via an NH group or the at least two blocking agents reacting with the isocyanate functional group via an OH group, the at least two blocking agents having a deblocking temperature of between 80 and 200° C. in the octanol test and being selected so that, in the octanol test at 110° C., the ratio D = percentage ⁢ ⁢ in ⁢ ⁢ equivalents ⁢ ⁢ of ⁢ ⁢ blocking agent ⁢ ⁢ which ⁢ ⁢ deblocks ⁢ ⁢ first ⁢ ⁢ at ⁢ ⁢ 110 ⁢ ° ⁢ ⁢ C . percentage ⁢ ⁢ in ⁢ ⁢ e ⁢ quivalents ⁢ ⁢ of ⁢ ⁢ blocking agent ⁢ ⁢ which ⁢ ⁢ deblocks ⁢ ⁢ last ⁢ ⁢ at ⁢ ⁢ 110 ⁢ ° ⁢ ⁢ C . is greater than 4/3, wherein said at least partially blocked aliphatic isocyanates fulfill the following conditions: at least one-third of the free or blocked NCO functional groups are connected to a hydrocarbonaceous backbone via a saturated (sp 3 ) carbon; at least one-third of said saturated (sp 3 ) carbons carry at least one hydrogen; and at least one-third of said saturated (sp 3 ) carbons are connected to said backbone via a carbon atom itself bearing at least one hydrogen, with the proviso that, when a blocking agent comprises a phenol functional group as blocking functional group, it does not comprise a COOH functional group and that, when one of the blocking agents is 1,2,4-triazole, another cannot be methyl ethyl ketoxime, and when the composition comprises more than two blocking functional groups and one of the agents represents a five-membered nitrogenous heterocycle, the composition comprises more than 30 equivalent % of blocking agents reacting with the isocyanate functional group via the OH functional group.