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US 4,229,564 AGranted
Friedel-Crafts polymerization of monomers in the preparation of polyketones and polysulfones
AssigneeRaychem Corporation
InventorKlaus J. Dahl
Life of this patent
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AssigneeRaychem Corporation
InventorKlaus J. Dahl
Estimating the term…
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.
A process for producing a polymer comprising polymerizing at least one monomer under Friedel-Crafts conditions, said monomer having both an electrophillic and a nucleophillic reaction center under said Friedel-Crafts conditions, the electrophillic center on one monomer molecule reacting with the nucleophillic center on another to propagate said polymer, in the presence of a molecular weight control agent that reacts only as a nucleophile under the reaction conditions.
A polymer of the structure (NE).sub.x --M wherein (NE).sub.x is a polymer chain of X repeating units derived from the polymerization of a monomer unit EN having both an electrophillic reaction center E and a nucleophillic reaction center N under Friedel-Crafts reaction conditions, the electrophillic center of one monomer unit reacting with the nucleophillic reaction center of another to propagate said polymer chain, and --M is a moiety arising from the reaction of an electrophillic center on said polymer chain with a molecular weight control agent of the formula M-H having a single nucleophillic reaction center under the reaction conditions.
A polymer of the structure (NE).sub.x --M'--(EN).sub.y wherein (NE).sub.x and (EN).sub.y are polymer chains of x and y repeating units respectively derived from the polymerization of a monomer unit EN having both an electrophillic reaction center E and a nucleophillic reaction center N under Friedel-Crafts reaction conditions, the electrophillic center of one monomer unit reacting with the nucleophillic reaction center of another to propagate said polymer chain, and --M'--is a moiety arising from the reaction of an electrophillic center on each of said polymer chains with a molecular weight control agent of the formula H--M'--H having two nucleophillic reaction centers under the reaction conditions.
Dependencies are inferred from the claim text.