this material is derived from a polyester based polyol dissolved in styrene and polyisocyanate in the first stage of the reaction when the polyol component reacts with isocyanate in a what is called chain extension reaction urethane bonds are formed in the second stage of the reaction the double bonds in the polyester polyol react with the styrene as radical polymerization and cross link a network structure typical of thermoplastic resins in the material the resulting polymer a vinylesterurethane has a what is called hybrid structure in which there is both a urethane bond known from polyurethanes and a bond typical of vinylesters the first and the second stage of the reaction take place typically at the same time there are several different accelerator and initiator systems which can be used to control the speed of the reactions through the choice of a specific system and the selection of a given polyester polyol it is possible to regulate the properties of the resulting vinylesterurethane as desired in view of the specific use to which a doctor blade comprising the vinylesterurethane will be put and the method by which the blade will be manufactured in addition to the good mechanical properties of vinylesterurethanes strength.