| 摘要 |
A catalyst system for the polymerization of phenyl glycidyl ethers (see Group IV(a)) comprises an aluminium trialkyl or a co-ordinating metal alkoxide, aryloxide, alkyl alkoxide, alkyl aryloxide or halogen-substituted derivative thereof, preferably together with a co-catalyst which is a metal oxide or chloride. The co-ordinating metal of the first catalyst has an ionic radius of 0,2 to 0,98 , an atomic radius less than 1,6 , an atomic weight less than 66 and exists in a state where its valency is 2, 3 or 4. Examples are aluminium methoxide, ethoxide, isopropoxide, butoxide, chloroisopropoxide, chloroethoxide, diethyl butoxide, diethyl propoxide, propyl ditert. butoxide and triethyl, zinc and magnesium di-tert. butoxides and ethyl zinc butoxide, and the corresponding derivatives of the other metals such as chromium, iron, magnesium, titanium, cobalt and nickel. Specified co-catalysts are the chlorides of zinc, beryllium, lithium and cobalt. The proportions of the two components may vary widely. In Example 1, a solution of isotactic polyphenyl glycidyl ether in cyclohexanone or o-dichlorobenzene, diluted with toluene, is cast on a white polvinyl chloride article and heated to form a film thereon. Specification 893,274 is referred to.ALSO:The invention comprises isotactic polymers of a phenyl glycidyl ether and copolymers with other olefin oxides. They are prepared by polymerizing in the presence of a catalyst comprising an aluminium trialkyl or a coordinating metal alkoxide, aryloxide, alkyl alkoxide, alkyl aryloxide or halogen-substituted derivative thereof, the co-ordinating metal having an ionic radius of 0.2 to 0.98 , an atomic radius less than 1.6 , an atomic weight less than 66 and existing in a state where its valency is 2, 3 or 4. A co-catalyst is preferably used, examples being metal oxides and halides. Specified catalysts are aluminium methoxide, ethoxide, isopropoxide, butoxide, chloroisopropoxide, chloroethoxide, diethyl butoxide, diethyl propoxide, propyl di-tert. butoxide and triethyl, zinc and magnesium di-t-butoxides, and ethyl zinc butoxide; and the corresponding derivatives of the other metals such as chromium, iron, magnesium, titanium, cobalt and nickel are mentioned. Specified co-catalysts are the chlorides of zinc, beryllium, lithium and cobalt. The catalyst may be made insoluble by using a polyhydric alcohol in the preparation. The monomer may be phenyl glycidyl ether itself or a derivative thereof wherein the phenyl group is substituted by halogen, nitro, alkyl or aryl. Specified comonomers are ethylene and propylene oxides. Temperatures of 50 DEG to 150 DEG C. are suitable and a solvent may be used. Examples describe the preparation of isotactic polyphenyl glycidyl ethers which are partly soluble and partly insoluble in acetone but soluble in hot cyclohexanone, benzene, o-dichlorobenzene, dimethyl formamide and phenyl glycidyl ether monomer, from which films may be cast. Specification 893,274 is referred to. |
