Solid-state method for treating polyamide and polyester articles
AssigneeGreen Theme Technologies Inc.
InventorXia Zhao
Life of this patent
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Abstract
Solid-state branching and/or crosslinking of aliphatic polyamide or polyester articles is achieved using a topical approach. A surface of the article is coated with a composition that includes a polyene and a free radical initiator. The article and applied coating are then heated to induce branching and/or crosslinking in the polyamide or polyester. This is performed below the crystalline melting temperature of the polyamide or polyester, or in the case of a fabric, below the melting temperature of the fibers in the fabric. Fabrics treated in this manner exhibit reduced or even no dripping in vertical flame tests.
Claims17
A solid-state method for treating a polyamide and/or polyester article which article comprises a polyamide and/or polyester component having a crystalline melting temperature of at least 100° C., in which the polyamide and/or polyester component comprises at least one thermoplastic aliphatic polyamide or thermoplastic polyester resin, the method comprising;
- a) at a temperature below the crystalline melting temperature of the polyamide and/or polyester component, applying a coating composition to at least one surface of the article and into contact with at least one polyamide and/or polyester component of the article, wherein the coating composition comprises i) 30 to 99 weight percent of at least one polyene compound, the polyene compound having 2 to 6 vinyl groups, an equivalent weight per vinyl group of up to 250 g/equivalent, and (ii) at least one peroxy or azo free radical initiator, wherein the amount of coating composition is sufficient to provide at least 0.05 kg of polyene compound per kg of polyamide and/or polyester component in the article;
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- b) heating the coated article to a temperature of at least 70° C. but below the crystalline melting temperature of the polyamide and/or polyester component to decompose the peroxy or azo free radical initiator to form free radicals and produce crosslinking in the aliphatic polyamide and/or polyester resin.
A solid-state method for treating an polyamide and/or polyester fabric which fabric comprises polyamide and/or polyester fibers alone or a blend of aliphatic polyamine and/or polyester resin fibers with fibers of at least one other polymer that is not an aliphatic polyamide and/or polyester resin, the fibers having a melting temperature of at least 100° C. as measured according to ASTM D7138-16, the method comprising;
- a) at a temperature below the melting temperature of the fibers, applying a coating composition to at least one surface of the fabric, wherein the coating composition comprises i) 30 to 99 weight percent of at least one polyene compound, the polyene compound having 2 to 6 vinyl groups, an equivalent weight per vinyl group of up to 250 g/equivalent, and (ii) at least one peroxy or azo free radical initiator, wherein the amount of coating composition is sufficient to provide at least 0.05 kg of polyene compound per kg of polyamide and/or polyester fibers in the fabric;
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- b) heating the coated fabric to a temperature of at least 70° C. but below the melting temperature of the fibers to decompose the peroxy or azo free radical initiator to form free radicals and produce branching and/or crosslinking in the aliphatic polyamide and/or polyester resin.
A solid-state method for reducing melting and/or dripping of an aliphatic polyamide and/or polyester fabric which fabric comprises polyamide and/or polyester resin fibers alone or a blend of aliphatic polyamine and/or polyester resin fibers with fibers of at least one other polymer that is not an aliphatic polyamide and/or polyester resin, the fibers having a melting temperature of at least 100° C. as measured according to ASTM D7138-16, the method comprising;
- a) at a temperature below the melting temperature of the fibers, applying a coating composition to at least one surface of the fabric, wherein the coating composition comprises i) 30 to 99 weight percent of at least one polyene compound, the polyene compound having 2 to 6 vinyl groups, an equivalent weight per vinyl group of up to 250 g/equivalent, and (ii) at least one peroxy or azo free radical initiator, wherein the amount of coating composition is sufficient to provide at least 0.05 kg of polyene compound per kg of polyamide and/or polyester component in the fabric;
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- b) heating the coated fabric to a temperature of at least 70° C. but below the melting temperature of the fibers for a period of 1 minute to 2 hours.
Dependencies are inferred from the claim text.