Reactive oligomers as curing agent for unsaturated polyester
AssigneeBayer Aktiengesellschaft
InventorsDietrich Braun, Klaus Titzschkau
Life of this patent
Estimating the term…
Abstract
Reactive oligomers obtainable by reacting .alpha.-substituted acrylic acid derivatives and tetra-aryl succinic acid dinitriles do excellently work as non-peroxidic initiators for curing radically polymerizable compounds and compositions, particularly unsaturated polyester resins.
Claims7
In the process of curing a solution of an .alpha.-.beta. ethylenically unsaturated polyester in at least one vinyl or vinylidene compound which is copolymerizable therewith, in the presence of a non-peroxidic initiator at a temperature of from 60.degree.-200.degree. C., said .alpha.-.beta. ethylenically unsaturated polyester being the polycondensation product of at least one .alpha.-.beta. ethylenically unsaturated dicarboxylic acid or ester-forming derivative thereof and at least one polyhydroxy compound, the improvement which comprises initiating polymerization with an oligomer of the formula ##STR7## wherein Ar is aryl, R.sup.1 is alkyl, X is CN or COOR.sup.2 wherein R.sup.2 is hydrogen or alkyl having 1 to 12 carbon atoms and n is a number from 1 to 20.
Dependencies are inferred from the claim text.