The terminal radicals of the compounds of formula B1 are according to the definitions of R2 and R3 and if X represents COO or CONR5 , {HEAD ~ the acyl radicals} of {TAIL ~ acrylic} or methacrylic acid or the monoacyl radicals of maleic, fumaric or itaconic acid, or if monoalkyl esters of these acids with straight or branched chain alkanols of 1 to 10 carbon atoms, such as methanol, ethanol, butanol, diisobutyl alcohol or decanol, of if X represents oxygen, the vinyloxy radical of vinyl ethers 
The terminal radicals of the compounds of formula B1 are according to the definitions of R2 and R3 and if X represents COO or CONR5 , { HEAD ~ the acyl radicals } of { TAIL ~ acrylic } or methacrylic acid or the monoacyl radicals of maleic , fumaric or itaconic acid , or if monoalkyl esters of these acids with straight or branched chain alkanols of 1 to 10 carbon atoms , such as methanol , ethanol , butanol , diisobutyl alcohol or decanol , of if X represents oxygen , the vinyloxy radical of vinyl ethers
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