Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1976-04-26
1980-10-21
Lee, Lester L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528125, 528126, 528128, 528205, 528206, 528220, 528222, 528225, 528360, 528361, 528391, C08G 6700, C08G 7520
Patent
active
042295645
ABSTRACT:
The molecular weight of highly aromatic polymers made by the Friedel-Crafts polymerization of EN monomers of the formula Ar--L--Ar.sup.1 --X, wherein X is selected from SO.sub.2 Y or COY, Y being a radical selected from --OH, halogen, or alkyl, wherein Ar and Ar.sup.1 are independently ##STR1## wherein L is --CO--, --SO.sub.2 --, phenyleneoxy, --NHCO--, a covalent bond, --O--, or --CR.sub.2 --, wherein each R is independently hydrogen, an alkyl or fluoroalkyl group, phenyl or a phenyl group substituted by an electron withdrawing group such as halogen, NO.sub.2 or --CN, is controlled by including in the reaction mixture an acylatable aromatic compound whose rate of acylation under Friedel-Crafts conditions is at least about 150 times that of benzene. The molecular weight of other polymers made from EN type monomers by Friedel-Crafts catalysis can also be controlled in this way.
REFERENCES:
patent: 3441538 (1969-04-01), Marks et al.
patent: 4111908 (1978-09-01), Dahl
Lee Lester L.
Raychem Corporation
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