Process for preparing expanded copolymers based on poly(meth)acrylimide comprising an adhesion promoter
View Patent ↗The invention describes a method for producing a foam molding from poly(meth)acrylimide, an adhesion promoter or an adhesion promoter mixture and optional auxiliaries, comprising the following steps: grinding a polymeric molding made of poly(meth)acrylamide, coating the grindings obtained in the preceding step with an adhesion promoter, introducing the coated grindings into a mold, optionally adding the auxiliaries, heating the mold, cooling the mold below the foaming temperature, and demolding the foam molding. The resulting foam molding has outstanding mechanical properties and is suitable for applications including as a component in the production of space, air, water and land vehicles.
1. A method for producing a foam molding from poly(meth)acrylimide, an adhesion promoter or an adhesion promoter mixture and optional auxiliaries, the method comprising:
grinding a polymeric molding comprising poly(meth)acrylimide, to obtain grindings,
coating the grindings with an adhesion promoter, to obtain coated grindings,
introducing the coated grindings into a mold,
optionally adding auxiliaries to the mold,
heating the mold to form a foam molding,
cooling the mold below a foaming temperature, and
demolding the foam molding.
2. The method of claim 1 , further comprising
pre-foaming the grindings before coating the grindings.
3. The method of claim 1 , wherein the adhesion promoter comprises a polyamide.
4. The method of claim 1 , wherein the adhesion promoter comprises a poly(meth)acrylate.
5. The method of claim 1 , wherein the adhesion promoter comprises a polyamide in an amount of 1% to 20% by weight, based on a weight of the grindings.
6. The method of claim 1 , wherein the adhesion promoter comprises a polyamide in an amount of 1% to 15% by weight, based on a weight of the grindings.
7. The method of claim 1 , wherein the adhesion promoter comprises a polyamide in an amount of 1% to 10% by weight, based on a weight of the grindings.
8. The method of claim 1 , wherein the adhesion promoter comprises a poly(meth)acrylate in an amount of 1% to 20% by weight, based on a weight of the grindings.
9. The method of claim 1 , wherein the adhesion promoter comprises a poly(meth)acrylate in an amount of 1% to 15% by weight, based on a weight of the grindings.
10. The method of claim 1 , wherein the adhesion promoter comprises a poly(meth)acrylate in an amount of 1% to 10% by weight, based on a weight of the grindings.
11. The method of claim 1 , comprising adding the auxiliaries to the mold.
12. The method of claim 2 , comprising adding the auxiliaries to the mold.