Process for the preparation of polyarylene sulphides

Details Process for the preparation of polyarylene sulphides Process for the preparation of polyarylene sulphides

C - Chemistry, Metallurgy

08

G

402/344

C08G 75/16 (2006.01) C08G 75/02 (2006.01)

Patent

CA 1181896

ABSTRACT OF THE DISCLOSURE A process for preparing a polyarylene sulphide which consists essentially of reacting (a) dihalogenobenzene consisting of 50 to 100 mol % of a compound of the formula (I) Image and a compound of the formula (II) Image or a mixture thereof and of 0 to 50 mol % of a compound of the formula (III) Image wherein X is halogen and each R is selected from the group consisting of hydrogen, alkyl having 1 to 20 carbon atoms, cycloalkyl having 5 to 20 carbon atoms, aryl having 6 to 24 carbon atoms, alkaryl having 7 to 24 carbon atoms and aralkyl having 7 to 24 carbon atoms with the proviso that at least one R is other than hydrogen, or two radicals R can be linked to form an aromatic or heterocyclic ring, and (b) 0 to 3.0 mol % based on the dihalogenobenzene content of a polyhalogeno aromatic of the formula ArXn (IV) wherein Ar is an aromatic or heterocyclic radical with 6 to 24 carbon atoms having at least 3 free valencies, X is hydrogen and n is ? 3 with (c) an alkali metal sulphide in (d) a polar solvent in the presence of (e) 0.05 - 2.0 mol of alkali metal fluoride per mol of alkali metal sulphide, said alkali metal fluoride being selected from the group consisting of sodium fluoride, potassium fluoride and mixtures thereof for a polycondensation time of up to 30 hours and at a polycondensation temperature of between 160 and 295°C, the molar ratio of (a) to (c) being in the range from 0.85:1 to 1.15:1 and the molar ratio of (c) to (d) being in the range of from 1:2 to 1:15. Polyarylene sulphides with higher intrinsic viscosities or limiting viscosity values and a lower melt index are obtained by the process according to the invention than by an analogous process in which no alkali metal fluorides are also used.

378026

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