The accelerating activity of N,N-substituted aminoethyl methacrylates on the curing of methyl methacrylate and composite resins with benzoyl peroxide is somewhat smaller than that of dimethyl-p-toluidine. Tesins cured with aminoethyl methacrylates containing a p-tolyl and 3,5-xylyl substituent on the nitrogen atom turned approximately the same color in ultraviolet light as resins cured with dimethyl-p-toluidinemthe incorporation of the predominant part of an unsaturated tertiary amine into polymer chains reduces to a minimum the possibility of its diffusion from the resin into the surrounding tissue.

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Zum Nachweis, daß bei der Reaktion von Dibenzoylperoxid mit tertiären Aminen die instabilen Ester des α‐Aminocarbinols (I) als primäre Produkte entstehen, welche dann entweder mit dem Ausgangs‐Amin oder miteinander unter Bildung von Benzoesäure und dehydrierten Aminen reagieren, wird die zeitliche Änderung der Konzentration der Ausgangskomponenten und der p‐Nitrobenzoesäure sowie des N‐Methyl‐p‐toluidins oder N‐Methylamidins bei der Umsetzung von p,p′‐Dinitrobenzoylperoxid mit N,N‐Dimethyl‐ptoluidin oder N,N‐Dimethylmesidin verfolgt.

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3-and 4-dimethylaminobenzyl acrylates (3 and 4) and methacrylates (1 and 2) were prepared and their densities, IR and NMR spectra are recorded. In order to evaluate their reactivity towards benzoyl peroxide, the rate constants of the reaction of benzoyl peroxide with 3-and 4-dimethylaminobenzyl alcohols and 3-and 4-dimethylaminobenzyl acetates were determined. The reactivity of the esters prepared in this work appeared to be weaker than that of an N-aryl-N-alkylaminoalkyl methacrylate. The blocks of homopolymers of these esters and of their copolymers (mole ratio 1 : 1) with styrene and methyl methacrylate are crosslinked. Both homopolymers and copolymers of 1 and 3 are more stable in polar solvents and on heating than polymers of 2 and 4. The copolymerization parameters of 1 and 2 with styrene are close to the copolymerization parameters of methyl methacrylate with styrene.