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US 10,619,024 B2Granted
Polyfunctional alcohols as cross-linkers in PMI foams
AssigneeEvonik Operations GmbH
InventorsThomas Richter, Thomas Barthel, Lars Bork, Christoph Seipel, Kay Bernhard
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Abstract
The invention relates to the production of PMI foams, more particularly to their formulating ingredients, which lead to particular facility in adjusting the density at given foaming temperature.
Claims10
A method for producing a foam of poly(meth)acrylimide, the method comprising:
- polymerizing a mixture comprising (meth)acrylonitrile, (meth)acrylic acid, a polyol having between 2 and 10 hydroxyl groups, at least one initiator and at least one blowing agent to form a slab or a powder,
- optionally temperature-conditioning the mixture, and
- then foaming the mixture at a temperature between 120 and 300° CU,
- wherein crosslinking does not occur until during foaming.
1 more element
Dependencies are inferred from the claim text.