Patent GB-1107370-A (GB)
Title: Polyethers and polythioethers and a process for their preparation
IPC: A01G3/06
Filed: 1965-08-18
Abstract: Novel gel-free partially crystalline polymers and copolymers of epoxides and episulphides may be obtained by contacting at least one monomer of the formula <FORM:1107370/C3/1> where Q is oxygen or sulphur and each R is hydrogen, alkyl, cycloalkyl, aryl, aralkyl, alkenyl, alkoxy or alkenoxy and the R-substituents may be the same or different and a radical R on each carbon may be joined to form a cycloaliphatic radical, with a catalyst comprising a mixture of (a) at least one component of the formula MR211 where each R11 is hydrogen, alkyl, cycloalkyl, alkenyl, aryl or aralkyl and the R11-substituents may be the same or different and M is Zn or Cd; (b) at least one component of the formula <FORM:1107370/C3/2> where each R1 is hydrogen, alkyl, aryl, aralkyl, alkoxyalkyl or alkoxy and the R1-substituents may be the same or different; and (c) water, the molar ratio of (b) to (a) being from 0.1 to 10 and the molar ratio of (c) to (b) being from zero to 9. The novel polymers are characterized by being gel-free as indicated by their complete solubility in a good solvent, i.e. a solvent which will dissolve both amorphous and crystalline forms, e.g. benzene; being partially crystalline as indicated by at least 24.6% insolubility in a selective solvent, e.g. acetone, capable of dissolving the completely amorphous polymer but incapable of dissolving the highly crystalline polymer at a temperature of 30-60 DEG  C. below its melting point and after aging the polymer for at least 48 hours at said temperature range; possesing an inherent viscosity [c ) in the good solvent which is less than [11-0.0025 (90-I)2], where I is the per cent by weight insoluble in the selective solvent; and having a fraction insoluble in the selective solvent which has a "swelling value" of at least 8. The reaction is suitably effected under an inert atmosphere or in vacuo, suitably at a temperataure of from about - 50 DEG  C. to 200 DEG  C. and at a pressure at or near to atmospheric pressure and the reaction may be carried out in bulk or in an inert solvent or suspending medium e.g. an aromatic, aliphatic or cycloaliphatic hydrocarbon or an ether.  The amount of catalyst employed is generally within the range of from 10-4 to one mol. of metal alkyl in the catalyst per litre of monomer and the substituents R and R11 are preferably C1- 10 alkyl groups.  The polymers may be compounded with fillers e.g. carbon black, antioxidants and other conventional compounding materials and they may be vulcanized with conventional sulphur systems. Copolymers which may be obtained are, for example, those formed from ethylene and propylene oxides, ethylene and propylene sulphides, allyl glycidyl ether and propylene oxide, vinyl cyclohexene and 1-butene oxide monomers, cyclooctadiene and propylene oxide monomers, bicyclopentadiene monoxide and propylene oxide monomers and epichlorohydrin and propylene oxide, and copolymers formed from one or more saturated epoxide monomers with one or more unsaturated epoxide monomers e.g. ethylene oxide, propylene oxide and allyl glycidyl ether monomers, propylene oxide, styrene oxide and allyl glycidyl ether monomers or propylene oxide, allyl glycidyl ether and vinyl cyclohexene monoxide monomers.