Polyamide composition comprising a layered clay material modified with an alkoxylated onium compound
AssigneeUniversity of South Carolina Research Foundation
InventorsShriram Bagrodia, John Walker Gilmer, Jeffrey Todd Owens, Linda Gail Bernard, Sam Richard Turner, James Christopher Matayabas, Jr., Vasiliki Psihogios, Tie Lan
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Abstract
This invention relates to a composite composition comprising one or more polyamide polymers or copolymers, one or more layered clay materials, and one or more alkoxylated ammonium cations. The invention also relates to a process for preparing a nanocomposite and articles produced from the nanocomposite, including bottles.
Claims23
A nanocomposite material comprising:
- a. one or more polyamide polymers or copolymers comprising poly(m-xylylene adipamide), or poly(m-xylylene adipamide-co-isophthalamide), and
- b. one or more layered clay materials comprising a residue of a bentonite, or a residue of a montmorillonite, wherein the layered clay material comprises quaternary alkoxylated ammonium cations having the structure:
- wherein R1 and R2 may be the same or different and are organic ligands comprising from 1 to 30 carbon atoms;
- p and n are integers of at least 1 and can be the same or different;
- and R3 and R4, may be the same or different and are hydrogen or hydrocarbons comprising from 1 to 4 carbon atoms.
A process for preparing a composite composition comprising the steps of:
- a. treating a layered clay material with at least one ammonium salt comprising one or more alkoxylated ammonium cations wherein the cation is an ammonium cation of the formula:
- wherein R1 and R2 may be the same or different and are organic ligands comprising from 1 to 30 carbon atoms;
- p and n are at least 1 and can be the same or different;
- and R3 and R4, may be the same or different and are hydrogen or hydrocarbons comprising from 1 to 4 carbon atoms, thereby forming a treated layered clay material, and
- b. mixing the treated layered clay material with a polymer composition comprising at least one polyamide polymer or copolymer comprising poly(m-xylylene adipamide), poly(hexamethylene isophthalamide-co-terephthalamide), poly(m-xylylene adipamide-co-isophthalamide), or a mixture thereof.
A polymer-clay nanocomposite having an improved gas permeability comprising:
- a. a melt-processible matrix polyamide comprising poly(m-xylylene adipamide), poly(hexamethylene isophthalamide-co-terephthalamide), poly(m-xylylene adipamide-co-isophthalamide), or a mixture thereof, and
- b. a layered clay material treated with an alkoxylated onium cation of the formula:
- wherein R1 and R2 may be the same or different and are organic ligands comprising from 1 to 30 carbon atoms;
- p and n are at least 1 and can be the same or different;
- and R3 and R4, may be the same or different and are hydrogen or hydrocarbons comprising from 1 to 4 carbon atoms,
- wherein the treated clay material is incorporated into the matrix polymer.
A polymer-clay nanocomposite having an improved gas permeability comprising:
- a. a melt-processible matrix polymer comprising poly(m-xylylene adipamide), poly(hexamethylene isophthalamide-co-terephthalamide), or poly(m-xylylene adipamide-co-isophthalamide), and
- b. a layered clay material comprising a bentonite or montmorillonite, treated with an alkoxylated onium cation comprising octadecylmethylbis(2-hydroxyethyl) ammonium chloride or tallowmethylbis(2-hydroxyethyl) ammonium,
- wherein treated clay material is incorporated into the matrix polymer.
Dependencies are inferred from the claim text.