Title:
PROCESS FOR PRODUCING SKIN/FOAM/SKIN STRUCTURE WITH HIGH SURFACE FINISH
Document Type and Number:
WIPO Patent Application WO/2021/239883
Kind Code:
A3
Abstract:
The invention relates to a process for preparing a skin/foam/skin article, comprising at least the steps: a1) depositing an outer composition in a hollow mould having a melt temperature Tmouter; a2) rotational moulding said outer composition, at an outer peak internal air temperature PIATouter wherein Tmouter < PIATouter; b1) depositing an intermediate composition in the hollow mould having a melt temperature Tmintermediate comprises a chemical blowing agent having a decomposition temperature Tdecomp; b2) rotational moulding said intermediate composition at an intermediate peak internal air temperature PIATintermediate wherein Tmintermediate < PIATintermediate < Tdecomp; c1) depositing an inner composition in the hollow mould having a melt temperature Tminner; c2) rotational moulding said inner composition at an inner peak internal air temperature PIATinner wherein Tdecomp < PIATinner, thereby obtaining said skin/foam/skin article. The invention also relates to a process for preparing a skin/foam/skin article, the process comprising at least the following steps: a1) depositing an outer composition in a hollow mould, said outer composition having a melt temperature Tmouter; a2) rotational moulding said outer composition in the hollow mould at an outer peak internal air temperature PIATouter wherein Tmouter < PIATouter, thereby forming the outer skin layer; d1) depositing a bi-phasic composition in the hollow mould, which comprises the outer skin layer, said bi-phasic composition comprising: - a powder phase having a melt temperature Tmpowder; and, - a pellet phase or micro-pellet phase having a melt temperature Tmpellet wherein Tmpowder ≤ Tmpellet; preferably Tmpowder < Tmpellet; - wherein said powder phase comprises at least one chemical blowing agent (CBA), said CBA having a decomposition temperature Tdecomp wherein Tmpowder < Tdecomp and Tmpellet < Tdecomp; d2) rotational moulding said bi-phasic composition in the hollow mould, at an intermediate peak internal air temperature PIATintermediate wherein Tmpowder < PIATintermediate < Tdecomp and Tmpellet < PIATintermediate < Tdecomp, thereby forming an intermediate layer; d3) rotational moulding said bi-phasic composition in the hollow mould, at an inner peak internal air temperature PIATinner wherein Tdecomp < PIATinner, thereby foaming the intermediate layer and forming the inner skin layer, thereby obtaining said skin/foam/skin article. The present invention also encompasses a skin/foam/skin article obtained by a process according to the invention, as well as car part obtained by the process according to the invention.
Inventors:
MAZIERS ERIC (BE)
Application Number:
PCT/EP2021/064219
Publication Date:
January 27, 2022
Filing Date:
May 27, 2021
Export Citation:
Assignee:
TOTAL RES & TECHNOLOGY FELUY (BE)
International Classes:
B29C44/06; B29C41/04; B29C41/06; B29C41/22; B29C41/52; B29C44/04; B29C44/08
Domestic Patent References:
| WO2008133535A1 | 2008-11-06 | |||
| WO2008074006A1 | 2008-06-19 |
Foreign References:
| US20060022365A1 | 2006-02-02 | |||
| US4913944A | 1990-04-03 |
Attorney, Agent or Firm:
RABOIN, Jean-Christophe (BE)
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