A process 1 for the preparation of a substituted urethane, in which process a compound or polymer of the formula: ##STR85## derived from a primary alcohol MOH is reacted with {HEAD ~ a compound} comprising {TAIL ~ at least one amine group} and at least one substituent selected from alcohol, thiol and carboxylic acid groups to produce the substituted urethane 
comprising
A process 1 for the preparation of a substituted urethane , in which process a compound or polymer of the formula : # # STR85 # # derived from a primary alcohol MOH is reacted with { HEAD ~ a compound } comprising { TAIL ~ at least one amine group } and at least one substituent selected from alcohol , thiol and carboxylic acid groups to produce the substituted urethane
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