ossibly having up to 24 carbon atoms; examples of alkyl acrylates or methacrylates are especially methyl methacrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate and n-octyl acrylate; [0050] vinyl esters of saturated carboxylic acids such as, for example, vinyl acetate or vinyl propionate; [0051] dienes such as, for example, 1,4-hexadiene. [0052] The polyethylene ma