Semi-solid primer compositions

16 A composition according to any preceding claim wherein the primer component is selected from:

• (i) 1,5-diazabicyclo[4.3.0]non-5-ene having the formula:
• 22
• 1,8-diazabicyclo[5.4.0]undec-7-ene having the formula:
• 23
• or 1,5,7-triazabicyclo[4.4.0]dec-5-ene having the formula:
• 24
• (ii) triphenyl phosphine, or
• (iii) ethylenediamine or derivatives of ethylenediamine having the formula:
• 25
• wherein each R, which may be the same or different, represents hydrogen, an alkyl, alkenyl or alkoxy group having 1 to 8 carbon atoms, an aryl group having 6 to 8 carbon atoms, a nitrogen-, sulphur-, or silicon-substituted group having up to 8 carbon atoms or a heterocyclic group having up to 8 carbon atoms which may be unsubstituted or substituted with hydroxy, ether oxygen or sulphur;
• or
• (iv) an imidazole having the formula:
• 26
• wherein R1 may be hydrogen;
• an alkyl group that is unsubstituted or substituted with an OH group or with an (alkyl-O)3Si group, wherein the alkyl radical has 1 to 4 carbon atoms;
• an aryl-alkyl group with 7 to 10 carbon atoms;
• or an imidazole-CO group, and R2 may be hydrogen or an alkyl, aryl, or aryl-alkyl group with up to 17 carbon atoms, with the condition that one of the substituents R1 or R2 has an aromatic character and X is one of the groups —CH═CH— or —CR3R4—CR5R6— wherein R3, R4, R5 and R6 independently of one another represent hydrogen, an alkyl group with 1 to 4 carbon atoms, or an aryl-alkyl group with up to 17 carbon atoms.

A composition according to any preceding claim wherein the primer component is selected from:

• 1,5-diazabicyclo[4.3.0]non-5-ene having the formula:
• 27
• 1,8-diazabicyclo[5.4.0]undec-7-ene having the formula:
• 28
• 1,5,7-triazabicyclo[4.4.0]dec-5-ene having the formula:
• 29