Low permeability nanocomposites
AssigneeExxonMobil Chemical Patents Inc.
InventorsAndy Haishung Tsou, Anthony Jay Dias
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Abstract
The present invention is a blend of a thermoplastic engineering resin and an interpolymer of, on one embodiment, a C4 to C7 isomonoolefin, a para-methylstyrene and a para-(halomethylstyrene), the interpolymer having been pre-mixed with an exfoliated-clay, the entire blend forming a nanocomposite. The resin may or may not have a clay present prior to blending with the interpolymer. The interpolymer/clay mixture forms a distinct phase in the nanocomposite blend of the invention. The blend of the invention has improved air barrier properties and is suitable as an air barrier.
Claims43
A nanocomposite comprising at least a first and second phase prepared by a method comprising forming the first and second phases, and blending the first and second phases, the first phase comprising a mixture of an interpolymer comprising C4 to C7 isomonoolefin derived units, para-methylstyrene derived units and para-(halomethylstyrene) derived units with an alkylamine-exfoliated or an alkylammonium-exfoliated clay;
- the second phase comprising at least one thermoplastic engineering resin containing an alkylamine-exfoliated or an alkylammonium-exfoliated clay.
A nanocomposite comprising at least two phases, wherein:
- a) one phase comprises an alkylamine-exfoliated or an alkylammonium-exfoliated clay and at least one thermoplastic engineering resin;
- and
- b) another phase comprises a blend of an alkylamine-exfoliated or an alkylammonium-exfoliated clay and an interpolymer of a C4 to C7 isomonoolefin containing up to 20 mole % of the following aromatic monomer units randomly spaced along the polymer chain:
- wherein R and R1 are independently hydrogen, C1 to C4 alkyl or primary or secondary alkyl halides and X is hydrogen, or a functional group selected from the group consisting of halogens;
- carboxylic acids;
- carboxy salts;
- carboxy esters, amides and imides;
- hydroxy;
- alkoxide;
- phenoxide;
- thiolate;
- thioether;
- xanthate;
- cyanide;
- cyanate;
- amino and mixtures thereof;
- wherein the nanocomposite is made by a method comprising blending the alkylamine-exfoliated or alkylammonium-exfoliated clay-containing thermoplastic resin phase with the alkylamine-exfoliated or alkylammonium-exfoliated clay-containing interpolymer phase.
A method of forming a nanocomposite comprising forming a first phase of an alkylamine-exfoliated or an alkylammonium-exfoliated clay and an interpolymer of C4 to C7 isomonoolefin derived units, para-methylstyrene derived units and para-(halomethylstyrene) derived units;
- and blending the first phase with at least a second phase comprising a thermoplastic engineering resin also including an alkylamine-exfoliated or an alkylammonium-exfoliated clay.
Dependencies are inferred from the claim text.