Adhesion of blowing agent-containing particles based on polyimides or polyacrylates

Patent metadata

Field	Value
Publication number	US-2024026109-A1
Application number	US-202118255409-A
Country	US
Kind code	A1
Filing date	Nov 16, 2021
Priority date	Dec 2, 2020
Publication date	Jan 25, 2024
Grant date	—

Abstract

A process for the production of functionalized particle foam mouldings based on a thermoplastic base material with a glass transition temperature of at least 100° C. involves functionalization of base particles.

First claim

1 : A process for production of a functionalized particle foam moulding based on thermoplastic base material with a glass transition temperature of at least 100° C. measured by DSC according to DIN EN ISO 11357-2, published: 2014-07, the process comprising in the sequence specified:
a) providing base particles comprising at least one blowing agent and at least one nucleating agent;
b) feeding the base particles into a device suitable for moving and heating the base particles;
c) simultaneously pre-foaming and functionalizing the base particles, by bringing the base particles into contact with a solution or dispersion comprising at least one functionalizing agent,
wherein the at least one functionalizing agent is an adhesive and, optionally, one or more further functionalizing agents are used together with the adhesive to functionalize the base particles, and
wherein the base particles are treated with a solution or emulsion of water and/or solvent and the at least one functionalizing agent,
so that functionalized particles are obtained which have at least partially an adhesive layer and, optionally, one or more functionalizations on their surface;
d) optionally, drying the functionalized particles;
e) optionally, interim storing of the functionalized particles; and
f) mould foaming of the functionalized particles by heating in a shaping container so that a functionalized particle foam moulding is formed.

2 : The process according to claim 1 , wherein the base material is selected from the group consisting of polyimide, polyacrylate, and mixtures thereof.

3 : The process according to claim 1 , wherein the at least one blowing agent is selected from the group consisting of volatile organic compounds having a boiling point at standard pressure below a glass transition temperature of the base material, inorganic blowing agents, thermally decomposable blowing agents, and mixtures thereof.

4 : The process according to claim 1 , wherein the at least one functionalizing agent is selected from the group consisting of biocides, fungicides, adhesives, fibers, dyes, pigments, electrically conductive base particles, and mixtures thereof.

5 : A method for production of a part for the aerospace industry, for shipbuilding, for wind power, sport and leisure equipment, or for vehicle construction, the method comprising:
forming the part with the functionalized particle foam moulding produced by the process according to claim 1 .

6 : The process according to claim 2 , wherein the base material is selected from the group consisting of polymethacrylimide (PMI), polyetherimide (PET), polymethyl (meth)acrylate (PM(M)A), and mixtures thereof.

7 : The method according to claim 5 , wherein the part is an electrical mobility vehicle part.

Assignees

• Evonik Operations Gmbh

Inventors

• Trassl Christian
• Hopf Florian
• Ganglauf Mona

Classifications

• C08J9/236 Primary

  using binding agents · CPC title

• C08J9/232 Primary

  by sintering expandable particles · CPC title

• C08J9/224

  Surface treatment · CPC title

• C08J9/142

  Compounds containing oxygen but no halogen atom · CPC title

• C08J9/0066

  Use of inorganic compounding ingredients · CPC title