Minnesota Mining and Manufacturing Company

Isovolta Oesterreichische Isolierstoffwerke Ag

Peter Fialla

Curtis R Guilbert

Electrically insulating wire coatings are resistant to prolonged exposure to 200.degree. C. when formed from a powder which, in a preferred composition, is a blend of

High-temperature resistant electrically insulating coating powder

Novel low-molecular weight polyesters consisting essentially of chain members of the formula ##STR1## wherein X is at least one member selected from the group consisting of ##STR2## and R is a bifunctional aliphatic hydrocarbon or a bifunctional hydrocarbon containing at least one aromatic or cycloaliphatic ring having an inherent viscosity of 0.08 to 0.35 dl/g measured at 30.degree. C. on a 100 ml solution of 0.5 g of polyester in a solvent of 60% by weight of phenol and 40% by weight of 1,1,2,2-tetrachloroethane useful for further polymerization with amines, amides, imides and a novel method of preparing the same.

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Wiener Neudorf, Austria

Peter Fialla