Cyclic monocarbonate bishaloformates, method for their preparati

Details Cyclic monocarbonate bishaloformates, method for their preparati Cyclic monocarbonate bishaloformates, method for their preparati

1987-03-24

1988-08-30

Pertilla, Theodore E.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528202, 528370, 528372, 525461, 549228, C08L 6900

Patent

active

047678402

ABSTRACT:
Cyclic monocarbonate bischloroformates are prepared by the reaction of a carbonyl halide such as phosgene with a bridged substituted resorcinol or hydroquinone such as bis(2,4-dihydroxy-3-methylphenyl)methane or bis(2,5-dihydroxy-3,4,6-trimethylphenyl)methane in the presence of aqueous alkali metal hydroxide. The cyclic monocarbonate bischloroformates may be used for the preparation of linear or cyclic polycarbonates containing cyclic carbonate structural units, which may in turn be converted to crosslinked polycarbonates.

REFERENCES:
patent: 4568755 (1986-02-01), Mues et al.

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