| 摘要 |
A process for preparing a reinforced and reactive thermoplastic composition having a continuous phase based on a thermoplastic polymer and dispersed therein is a discontinuous phase based on a reactive reinforcing agent that may be immiscible with the thermoplastic polymer is provided. A composition obtained by this process is also provided. The reinforcing agent is selected from the group consisting of epoxy resins, polyorganosiloxanes having SiH functional group(s), diisocyanates or polyisocyanates and mixtures thereof, comprises a grafting, a branching and/or a crosslinking, that are carried out in situ, by reactive compounding of these phases with a shear rate greater than 102 s−1, of the reinforcing agent onto the chain of the thermoplastic polymer, so that the discontinuous phase is dispersed homogeneously in the continuous phase in the form of nodules having a number-average size of less than 5 μm. |
| 主权项 |
1. A process for preparing a reactive thermoplastic composition comprising a continuous phase based on at least one thermoplastic polymer and dispersed in which is a discontinuous phase based on at least one reactive reinforcing chemical agent that may be immiscible with said at least one thermoplastic polymer and that is selected from the group consisting of epoxy resins, polyorganosiloxanes having SiH functional group(s), diisocyanates or polyisocyanates and mixtures thereof, wherein this process comprises a grafting, a branching and/or a crosslinking, that are carried out in situ, by a reactive compounding of these phases with a shear rate greater than 103 s−1, of said at least one reinforcing agent onto the chain of said at least one thermoplastic polymer, so that said discontinuous phase is dispersed in said continuous phase in the form of nodules having a number-average size of less than 5 μm with a maximum standard deviation of 0.5 μm, and wherein,
during this reactive compounding, at least one compatibilizing agent is used between these phases, which is selected from the group consisting of monomers, oligomers and random or block polymers having at least one acrylate, methacrylate or amine functional group and polyolefins grafted by a maleic anhydride; and/or said at least one reactive reinforcing chemical agent includes one or more of
a polyorganosiloxane having SiH functional groups along the chain or at the chain ends; ora diisocyanate or polyisocyanate selected from the group consisting of diphenylmethane-4,4′-diisocyanate (MDI), toluene-2,4-diisocyanate (TDI), hexamethylene-1,6-diisocyanate (HDI), polymethylene polyphenyl isocyanate (PMPPI) and mixtures thereof. |
