Abstract
Novel unsymmetrical oligomers comprising one alkenyl- and one cyanate-functional group of the general formula: in which X is an organic group containing an alkenyl double bond and Y is an organic group with a molecular weight of up to about 1000, have extensive applications in polymer technology in particular as modifiers for bis-maleimide polymer resins. Modified resins have improved high temperature performance while retaining other mechanical properties making them particularly suited to use in structural composites for use in aeronautical and automotive applications.