PREPARATION OF POLYHALOGENATED POLYESTERS FROM POLYHALOCYCLOPENTADIENE, CARBOXYLIC OUNDS AND POLYOLS OR POLYOL FORMING MATERIALS

摘要

1386639 Unsaturated polyesters HOOKER CHEMICAL & PLASTICS CORP 16 Aug 1972 [17 Aug 1971] 38251/72 Headings C3R and C3P Unsaturated polyesters are made by (1) forming an adduct of a polyhalogenated cyclopentadiene and anα-# unsaturated polycarboxylic acid or anhydride thereof by heating a mixture of the cyclopentadiene compound with an excess of the polycarboxylic acid compound in an atmosphere of an oxygen-containing gas, (2) replacing the atmosphere of oxygencontaining gas with an atmosphere of an inert gas, (3) polyesterifying the adduct mixture containing an excess of the polycarboxylic acid compound by heating the adduct mixture with an esterifying agent of the group consisting of polyols and alkylene oxides in the atmosphere of an inert gas and (4) separating an unsaturated polyester mixture which is copolymerizable with ethylenically unsaturated monomers. Preferably the adduct is formed from hexachlorocyclopentadiene and maleic anhydride, although the use of hexabromo- and difluoro tetrachlorocompounds is also mentioned. Many polyols from ethylene glycol upwards are specified for use in stage (3). Viscosity and melting point are used as criteria to observe the rate of reaction. Water removal may be effected by using an azeotropic hydrocarbon medium. Esterification catalysts may be present, e.g. an aromatic sulphonic acid, H 3 PO 4 or amines. Ethylenically unsaturated monomers referred to include styrene and its derivatives, and vinyl and allyl esters. Examples describe the detailed preparation of styrenated hexachloropentadienyl maleate.