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US 9,540,507 B2Granted
Composition for maintaining good color when thermally treating polyester-polyamide blends
AssigneeM&G USA Corporation
InventorsGuliz Arf Elliott, Paul Heater, Ricardo Knudsen, Gerald Orosz, Gianluca Ferrari
Life of this patent
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Abstract
A specially structured article is described which allows products made from the article to undergo a second heating without a dramatic color shift. This permits more recycled products from the material used to make the article.
Claims6
An article comprising a polyester polymer phase, a polyamide polymer and a stabilizer, wherein
- the polyester polymer phase is at least 80% by weight of the composition of the article and comprises a sulfonated polyester polymer comprising a metal sulfonate salt wherein the metal sulfonate is copolymerized into the polyester polymer phase,
- the metal sulfonate is in the form of X-R where X is selected from the group consisting of an alcohol, a carboxylic acid or an epoxy and R is selected from the group consisting of —SO3M where M is a metal in a +1 or +2 valence state,
- the polyamide polymer is a nylon and is present at a level of at least 1% by weight of the article,
- the stabilizer is present at a level of at least 100 parts stabilizer per million parts of the article and is present in the polyester polymer phase at at least 2% by weight of the total amount of the polyester polymer phase, and
- said article is a compartmentalized pellet of a core-sheath structure having the polyester polymer phase in the sheath and the polyamide polymer in the core.
2 more elements
Dependencies are inferred from the claim text.