| 摘要 |
Esters of tetracarboxylic acids having the following general formula: (RO2C')2=X=(C''O2R')2 wherein =X= is selected from tetravalent 5 or 6 membered or a double 6 membered ring system and wherein C' and C'' carbons are attached to separate pairs of vicinal carbons and R and R' are selected from halogenated organic radicals containing at least 2 atoms of chlorine or bromine and the other of each R and R' is selected from -H, -CH2CH(OH)CH2O2CCR''=CH2, and -CH[CH2(OH)]CH2O2 CCR''=CH2 are useful in the preparations of high molecular weight polymers and copolymers which are improved in fire retardance and strength.
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