Sulfonated aliphatic-aromatic copolyesters and shaped articles produced therefrom
AssigneeE. I. Du Pont de Nemours and Company
InventorRichard Allen Hayes
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Abstract
Sulfonated aliphatic-aromatic copolyesters are provided. The copolyesters are produced from a mixture of aromatic dicarboxylic acids, aliphatic dicarboxylic acids, ethylene glycol, other glycols, and components containing alkali metal or alkaline earth metal sulfo groups, such as a metal 5-sulfoisophthalic acid derivative. The copolyesters have lower sulfonation than known sulfonated polyesters, and provide advantageous thermal properties for some end uses. The sulfonated aliphatic-aromatic copolyesters are useful in forming coatings or films on various substrates, and in packaging. Some compositions comprising the sulfonated aliphatic-aromatic copolyesters are biodegradable, as are some of the sulfonated aromatic-aromatic copolyesters.
Claims79
A sulfonated aliphatic-aromatic copolyester comprising an acid component, a glycol component, and 0 to about 5.0 mole percent based on 100 mole % acid component of a polyfunctional branching agent selected from polyfunctional acid, glycol or mixtures thereof, wherein the acid component comprises
- a. about 97.95 to about 20.0 mole percent of an aromatic dicarboxylic acid component based on 100 mole percent total acid component, and
- b. about 2.0 to about 79.95 mole percent of an aliphatic dicarboxylic acid component based on 100 mole percent total acid component, and
- c. about 0.05 to about 0.75 mole percent of a sulfonate component based on 100 mole percent total acid component, and wherein the glycol component comprises
- a. about 100 to about 95.0 mole percent of ethylene glycol as a first glycol component based on 100 mole percent total glycol component, and
- b. 0 to about 5.0 mole percent of one or more of a second glycol component based on 100 mole percent total glycol component.
A blend comprising a sulfonated aliphatic-aromatic copolyester comprising from about 97.95 to about 20.0 mole percent of an aromatic dicarboxylic acid component, from about 2.0 to about 79.95 mole percent of an aliphatic dicarboxylic acid component, from about 0.05 to about 0.75 mole percent of a sulfonate component, from about 100.0 to about 95.0 mole percent of ethylene glycol, from 0 to about 5.0 mole percent of a second glycol component, and from 0 to about 5.0 mole percent of a polyfunctional branching agent, and one or more other polymeric materials.
Dependencies are inferred from the claim text.