Carboxylated diphenylether-formaldehyde copolymer resins and the

Details Carboxylated diphenylether-formaldehyde copolymer resins and the Carboxylated diphenylether-formaldehyde copolymer resins and the

1975-10-17

1977-08-30

Schain, Howard E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 293, 260675, 260831, 260839, 428460, C08G 1604

Patent

active

040454100

ABSTRACT:
Novel copolymer resins having the repeating unit ##STR1## WHEREIN EACH R is independently alkyl of 1 to about 10 carbon atoms or halogen, z is oxygen or sulfur, the dashed line is an optional chemical bond, the group represented by z taken with the dashed line represents dibenzofuran and dibenzothiophene moieties, or mixtures thereof, each R" is hydrogen or ##STR2## wherein each R' is a hydrocarbon or substituted hydrocarbon radical of from 2 to about 11 carbon atoms, n averages about 3-10, each m is 0-2 and p and q are each 0 or 1 with the proviso that the sum of p and q has an average value of 0.1-1.0 and there is an average of at least one carboxyl group per polymer molecule, are prepared by reacting a mixture comprising a hydroxymethylated diphenylether-formaldehyde copolymer with an anhydride of the formula ##STR3## wherein R' is a hydrocarbon or substituted hydrocarbon radical of from 2 to about 11 carbon atoms, at a temperature between about 120.degree. and about 170.degree. C. The copolymer resins form stable aqueous solutions in the presence of base which, when heated in the presence of a water-soluble curing agent, such as hexamethoxymethylmelamine, yield glossy, flexible and impact-, solvent-, and water-resistant films.

REFERENCES:
patent: 3914194 (1975-10-01), Smith
Die Makromolekulare Chemie 107 (1967) 196-203, Ninagawa et al.
Chem. Abstracts, vol. 80, 1974, 134033y, Yamamoto.
Chem. Abstracts, vol. 76, 1972, Masuko et al., 47505c.

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