| 摘要 |
<p>Aromatic polyethersulphones that are particularly useful as adhesives and coatings having end groups of formula -OCH2COR, where R is alkyl or alkoxy. Preferred examples are -OCH2COCH3 and -OCH2COOC2H5. Such polymers may be made by heating polyethersulphones made from halophenates or bisphenate/dihalide mixtures, in the presence of a reagent of formula XCH2COR (X is halogen, preferably chlorine), such as chloroacetone or ethyl chloroacetate, for a short period of time. Such polymers of molecular weight (RV<0.25) are of particular use in coating compositions comprising a dispersion of a fluorocarbon polymer dispersed in a solution or dispersion of the polyethersulphone.</p> |
