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US 8,912,242 B2Granted
Polar polystyrene copolymers for enhanced foaming
AssigneeFina Technology, Inc.
InventorsWei Wang, David W. Knoeppel, Melissa Greenberg
Life of this patent
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Abstract
A method of making a foamable polystyrene composition includes combining a styrenic monomer and a co-monomer containing a polar functional group to obtain a mixture, subjecting the mixture to polymerization to obtain a styrenic co-polymer, and combining the styrenic co-polymer with a blowing agent in a foaming process to obtain foamed articles.
Claims22
A foamable polystyrene composition comprising:
- a blowing agent comprising carbon dioxide (CO2);
- and
- a styrenic co-polymer resulting from polymerization of a reaction mixture comprising a styrenic monomer and from 0.5 to 20 wt % a co-monomer comprising a polar functional that is hydroxyethylmethacrylate (HEMA) or caprolactone acrylate, wherein the styrenic co-polymer exhibits increased solubility of CO2 and decreased diffusivity of CO2 in comparison to a styrene polymer that is not modified with a co-monomer having a polar functional group.
A method of making a polar polystyrene copolymer comprising:
- combining a styrene monomer and a polar co-monomer that is hydroxyethylmethacrylate (HEMA) or caprolactone acrylate to obtain a reaction mixture, wherein the reaction mixture comprises from 0.5 to 20 wt % of the polar co-monomer;
- subjecting the reaction mixture to polymerization conditions to obtain a styrenic co-polymer;
- and
- combining the styrenic co-polymer with a blowing agent comprising carbon dioxide (CO2) to obtain a foamable blend, wherein the styrenic co-polymer exhibits increased solubility of CO2 and decreased diffusivity of CO2 in comparison to a styrene polymer that is not modified with a co-monomer having a polar functional group.
1 more element
An expandable polystyrene, comprising:
- a styrenic copolymer;
- and
- a blowing agent comprising carbon dioxide (CO2);
- wherein the styrenic polymer results from polymerization of a reaction mixture of a styrene monomer and from 1 to 20 wt % of a co-monomer having a polar functional group, wherein the styrenic copolymer exhibits increased solubility of CO2 and decreased diffusivity of CO2 in comparison to a styrene polymer that is not modified with a co-monomer having a polar functional group;
- wherein the co-monomer having a polar functional group is hydroxyethylmethacrylate (HEMA) or caprolactone acrylate.
2 more elements
Dependencies are inferred from the claim text.