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US 4,065,440 AGranted
Malonate ester chain coupling of polyesters
AssigneeStandard Oil Company (Indiana)
InventorCarl Serres, Jr.
Life of this patent
Estimating the term…
Abstract
Increasing the molecular weight of polyesters by reaction with polyfunctional acyl compounds having at least two alkylidene malonate groups.
Claims10
The method of increasing the molecular weight of polyesters which comprises forming a composition comprising a polyester having an I.V. of at least 0.2 dl/g and 0.1 to 10 parts by weight of a compound having two or three alkylidene malonate groups per 100 parts by weight of said polyester and reacting said polyester and compound under melt or solid state polymerization conditions.
Dependencies are inferred from the claim text.