Polycondensation catalyst

Details Polycondensation catalyst Polycondensation catalyst

1987-05-04

1988-10-18

Foelak, Morton

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

Synthetic resins

From carboxylic acid or derivative thereof

528 89, 528141, 528179, 528223, 528242, 528272, 528313, 528336, 528351, C08G 6304, C08G 6368

Patent

active

047788739

ABSTRACT:
Condensation polymers of high molecular weight, such as polymers, polyureas, and polyamides, are usually prepared at temperatures of 200.degree. C. or greater. However, by utilizing the catalyst system of the present invention condensation polymers can be synthesized at much lower temperatures. These catalyst systems are comprised of (1) a silicon-phosphorus composition which contains at least one divalent oxygen atom which is bonded directly to a tetravalent silicon atom and a trivalent or pentavalent phosphorus atom; and (2) at least one acid acceptor. For example, P(OSiR.sub.3).sub.3 wherein R can be an aliphatic or aromatic hydrocarbon radical, can be used in conjunction with a basic solvent as a catalyst system. Polymeric agents having pendant diphenylphosphine dichloride groups can also be used in conjunction with an acid acceptor as a catalyst system.

REFERENCES:
patent: 4077944 (1978-03-01), Weinberg et al.
patent: 4156072 (1979-05-01), Weinberg et al.
patent: 4668762 (1987-05-01), Ogata

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