Modified polyamides, compositions based on same and macromolecular compounds used to obtain them
AssigneeRhodia Engineering Plastics S.r.l.
InventorsNicolangelo Peduto, Franco Speroni, Haichun Zhang
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Abstract
The invention concerns polyamides modified by a multifunctional compound. Finished articles formed from said polyamides or from compositions based on said polyamides exhibit excellent mechanical properties, and a very good surface appearance. The modified polyamide is obtained by mixing in melted form a polyamide and a polyamide macromolecular compound comprising star-shaped or H-shaped macromolecular chains.
Claims18
Modified polyamide obtained by melt-blending at least the following two compounds:
- Compound A:
- a polyamide containing repeating units whose formulae are chosen from formulae (I) and (II) below:
- —[NH—R1—NH—OC—R2—CO]— (I)—[NH—R3—CO]— (II)
- the radicals R1, R2 and R3 being hydrocarbon-based radicals optionally comprising hetero atoms
- Compound b:
- a polyamide macromolecular compound comprising starburst or h macromolecular chains, which may be obtained by a process chosen from the following two processes:
- Process A:
- copolymerization of a lactam and/or of an amino acid with a multifunctional compound and optionally bifunctional or monofunctional compounds,
- Process B:
- melt-blending of a multifunctional compound and a polyamide of the type obtained by polycondensation of lactams and/or of amino acids,
- the multifunctional compound comprising at least three reactive functions chosen from amines, carboxylic acids and derivatives thereof, the reactive functions being identical, the equivalent molar concentration of reactive functions of the multifunctional compound in compound B being greater than 4%.
Modified polyamide according to one of the preceding claims, characterized in that the melt-blending is performed in an extrusion device.
Modified polyamide according to one of the preceding claims, characterized in that the process chosen to obtain compound B is process B, and in that the melt-blending is performed in an extrusion device.
Modified polyamide according to one of the preceding claims, characterized in that the multifunctional compound has an arborescent or dendritic structure.
Modified polyamide according to one of the preceding claims, characterized in that compound B is obtained by process A, the lactam being caprolactam, or by process B, the polyamide being polyamide-6.
Polyamide macromolecular compound comprising starburst macromolecular chains and possibly linear macromolecular chains, obtained by copolymerization of a lactam and/or of an amino acid with a multifunctional compound and optionally bifunctional or monofunctional compounds, the multifunctional compound comprising at least three reactive functions chosen from amines, carboxylic acids, and derivatives thereof, the reactive functions being identical, the equivalent molar concentration of reactive functions of the multifunctional compound in the compound being greater than 4%.
Dependencies are inferred from the claim text.