Polyether compositions

专利名称：Polyether compositions发明人：JEFFERS FRANCIS GEORGE申请号：US83316259申请日：19590812公开号：US2990395A公开日：19610627

摘要：Polyethers are stabilized against oxidation by incorporating a 2-a -alkylcycloalkyl-4, 6-dimethylphenol or a bis-(2-hydroxy-3-a -alkylcycloalkyl5-methylphenyl) methane wherein the alkyl group has not more than 4 carbon atoms andthe cycloalkyl group is cyclopentyl, methyl cyclopentyl, cyclohexyl or methylcyclohexyl.These anti-oxidants, which are described in Specifications 723,838 and 728,290, may alsobe used in the form of their salts, e.g. normal or basic aluminium, barium, calcium,magnesium or zinc salts. Polyethers which may be stabilized include hydroxyl-endedpolymers and copolymers of cyclic ethers, e.g. ethylene and propylene oxides,epichlorhydrin, oxacyclobutane, substituted oxacyclobutane, and terahydrofuran (c.f.Specification 733,624). Small proportions (less than 5% molar) of polyfunctional reagentsmay be copolymerized, e.g. glycidol, glycerol, trimethylolpropane and 3-hydroxymethyloxacyclobutane. The antioxidant may be used in proportions up to 5% byweight of polyether and may be added to the reaction mixture (particularly whenpolymerizing tetrahydrofuran) or to the preformed polymer.ALSO:Polyethers arestabilised against oxidation by incorporating a 2-a -alkylcycloalkyl-4,6-dimethyl phenol ora bis-(2-hydroxy-3-a -alkylcycloalkyl-5-methyl phenyl) methane wherein the alkyl grouphas not more than 4 carbon atoms and the cycloalkyl group is cyclopentyl, methyl

cyclopentyl, cyclohexyl or methylcyclohexyl. These anti-oxidants, which are described inSpecifications 723,838 and 728,290, may also be used in the form of their salts, e.g. normalor basic aluminium, barium, calcium, magnesium or zinc salts. Polyethers which may bestabilised include hydroxyl-ended polymers and copolymers of cyclic ethers, e.g.ethylene and propylene oxides, epichlorhydrin, oxacyclobutane, substituted

oxacyclobutane, and tetrahydrofuran (c.f. Specification 733,624). Small proportions (lessthan 5% molar) of polyfunctional reagents may be copolymerised, e.g. glycidol, glycerol,trimethylolpropane and 3-hydroxymethyloxacyclobutane. The antioxidant may be used inproportions up to 5% by weight of polyether and may be added to the reaction mixture(particularly when polymerising tetrahydrofuran) or to the performed polymer.

申请人：IMPERIAL CHEMICAL INDUSTRIES LIMITED

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