Polymers of a diester of 3 : 6-endoxa-1 : 2-cyclohexane-dicarboxylic acid or the 3-hydrocarbon substituted derivative, e.g. methyl and ethyl, and an alcohol of the formula CH2= CR-CH2OH, where R is hydrogen, halogen or a hydrocarbon group, e.g. allyl, beta-chlorallyl and beta-methylallyl, are made by heating, in bulk or in a solvent, e.g. benzene, preferably in the presence of a polymerization catalyst. The polymers may be prepared in the solvent-insoluble and infusible state or as a fusible, organic-solvent soluble product by stopping the reaction at the desired stage. The polymerization may be carried out in a mould or on a support such as paper, woven fabric, cardboard, wood or glass fibres. The fusible polymers, dissolved in a solvent, e.g. chloroform, dibutyl phthalate or its own molten monomer, may be used for coating metal surfaces, e.g. aluminium, as an adhesive, e.g. for plywood, or as an abrasive grit bond and the polymer further polymerized to the insoluble state, after, if desired, removal of the solvent. The monomer or the fusible polymer may be mixed with pigments, fillers and dyes. Specified catalysts are benzoyl, acetyl, acetone and tetrahydronaphthalene peroxides, and the resinate, naphthenate or linoleate of cobalt, manganese or lead. The moulded products may be used as electric insulators.ALSO:Diesters of a 3 : 6-endoxa-1 : 2-cyclohexanedicarboxylic acid or the 3-hydrocarbon derivative thereof, e.g. methyl and ethyl, and an alcohol of the formula CH2=CR-CH2OH, where R is hydrogen, halogen or a hydrocarbon group, are made by condensing the alcohol and the acid anhydride by heat alone, or in the presence of sodium silicate, or dissolved in a solvent in the presence of benzenesulphonic acid. The diester readily polymerizes (see Group IV (a)).