Polymer compositions with improved mechanical properties
AssigneeRhodianyl
InventorsYves BOMAL, Jean-Pierre MARCHAND, Gilles GRANGE, Didier TUPINIER, Joel VARLET
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Abstract
The invention concerns thermoplastic materials with improved mechanical properties, comprising a matrix and inclusions. The materials comprise at least two families of inclusions defined by their type, shape and dimensions and optionally by their concentration. The materials can in particular be used for making molded thermoplastic articles.
Claims25
A process for manufacturing a thermoplastic composition comprising:
- (1) a matrix consisting of a polypropylene or polyamide polymer and (2) inclusions dispersed in the matrix, wherein said inclusions comprise at least two types A and B defined as follows:
- (a) when said matrix consists of polypropylene, then inclusions A comprise calcium carbonate and inclusions B comprise silica;
- and
- (b) when said matrix consists of a polyamide, then inclusions A comprise silica and inclusions B comprise clay;
- and
- wherein:
- said inclusions A having a smallest size greater than 100 nm and a mean ligamentary distance in the matrix between the inclusions A being less than 1 μm;
- and
- said inclusions B are:
- approximately spherical inclusions whose mean diameter is less than 100 nm;
- inclusions having a form factor whose small dimension is less than 100 nm;
- or
- structurizing inclusions consisting of a group of elementary mineral particles, whose largest dimensions of said elementary particles being less than 100 nm;
- said process comprising incorporating inclusions A and inclusions B into the matrix by one or more extrusion operations.
A process for manufacturing a thermoplastic composition comprising a matrix consisting of a polypropylene polymer and inclusions dispersed in the matrix, said inclusions being of at least two types A and B:
- inclusions A consisting of calcium carbonate particles whose surface has been treated with stearic acid, said inclusions A having a mean size of between 0.3 μm and 2 μm;
- inclusions B consisting of a silica, which are:
- approximately spherical inclusions whose mean diameter is less than 100 nm;
- inclusions having a form factor whose small dimension is less than 100 nm;
- or
- structurizing inclusions consisting of a group of elementary mineral particles, whose largest dimensions of said elementary particles being less than 100 nm;
- wherein the inclusions A and B are obtained by incorporating particles into a medium for manufacturing the thermoplastic matrix.
A thermoplastic comprising a matrix consisting of a thermoplastic polymer and inclusions dispersed in the matrix, said inclusions being of at least two types A and B:
- inclusions A consisting of a mineral-based or macromolecular-based material, said inclusions having a smallest size great than 100 nm and a mean ligamentary distance in the matrix between the inclusions being less than 1 μm, optionally, less than 0.6 μm;
- inclusions B consisting of a mineral-based material, which are:
- approximately spherical inclusions whose mean diameter is less than 100 nm;
- inclusions having a form factor whose small dimension is less than 100 nm;
- or
- structurizing inclusions consisting of a group of elementary mineral particles, whose largest dimensions of said elementary particles being less than 100 nm.
Dependencies are inferred from the claim text.