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US 12,760,162 B2Granted
PEI or PEI-PEEK particle foams for applications in lightweight construction
AssigneeEvonik Operations GmbH
InventorsRoland Wursche, Christian Traßl, Sebastian Geerkens, Jörg Blaschke, Kay Bernhard, Denis Holleyn
Life of this patent
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Abstract
Polymer foams based on polyetherimides (PEI) or blends of polyetherimides and polyether ether ketone (PEEK) meet the legal requirements demanded by the aviation industry for aircraft interiors and for aircraft exteriors too.
Claims10
Blowing agent loaded particles produced from a polymer mixture by underwater pelletization,
- wherein the blowing agent-loaded particles are ellipsoidal particles having a mass of 0.5-15 mg
- wherein the polymer mixture comprises:
- polyetherimide,
- polyether ether ketone,
- 0.001% to 25% by weight of a blowing agent, and
- at least one nucleating agent;
- and
- wherein a foam produced from the polymer mixture has a density determined in accordance with DIN EN ISO 1183 of 40 to ≤200 kg/m3 and a glass transition temperature measured in accordance with DIN EN ISO 6721-1 of between 140 and 230° C.
5 more elements
Blowing agent-loaded particles A produced from a composition consisting of:
- 50% to 99.998% by weight of polyetherimide,
- 0% to 49.999% by weight of polyether ether ketone,
- 0.001% to 2% by weight of a nucleating agent,
- 0.001% to 20% by weight of a blowing agent, and
- optionally, up to 20% by weight of additives,
- wherein the blowing agent-loaded particles are produced from the composition by underwater pelletization, and
- wherein the blowing agent-loaded particles are ellipsoidal particles having a mass of 0.5-15 mg.
4 more elements
Dependencies are inferred from the claim text.