Polyamide composition
AssigneeINV Nylon Chemicals Americas, LLC
InventorsAli Syed Fareed, Chee Sern Lim
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Abstract
The present disclosure relates to thermoplastic resin compositions with improved impact strength, tensile modulus, and/or ductility, such as under low-temperature conditions. The present disclosure relates to articles formed therefrom, such as molded or extruded articles. The composition can include a condensation polyamide and a maleated polyolefin, such as ≥10 wt % to ≤50 wt % of a maleated polyolefin having a grafted maleic anhydride incorporation of ≥0.05 to ≤1.5 wt % based on total weight of the maleated polyolefin.
Claims20
A composition or a reacted product thereof, the composition comprising:
- a condensation polyamide, wherein the condensation polyamide is at least 30 wt % of the composition, wherein the condensation polyamide is the predominant polyamide in the composition;
- and
- from ≥10 wt % to ≤50 wt % of maleated polyolefin, wherein the maleated polyolefin comprises maleic anhydride grafted onto a polyolefin backbone, the maleated polyolefin having a grafted maleic anhydride incorporation of ≥0.05 to ≤1.5 wt % based on total weight of the maleated polyolefin.
A composition comprising a condensation polyamide, or a reacted product of the composition, wherein:
- when the composition or reacted product is formed into an impact test bar and tested at −30° C. according to ISO 179/2-1eA to form a −30° C. notched impact fractured surface, the composition or reacted product has:
- an Sdr measurement of ≥10% as obtained from a surface profilometry analysis of the −30° C. notched impact fractured surface, wherein Sdr represents the degree to which the actual surface area increases in comparison to a flat state, or
- a stress whitening zone thickness of ≥500 microns at a halfway distance through the fracture and in a transversal surface cut plane (TCUT), the transversal cut plane being perpendicular to the original fracture surface, or
- a porosity area fraction (%) within the first 50 microns below the −30° C. notched impact fractured surface in a transverse cross-section direction taken at ≥3 to ≤5 mm linear distance from the notch of ≥5% to ≤31%, or
- a numerical mean of the aspect ratio (pore major axis/minor axis) of a representative sample of pores measured within the first 50 microns below the −30° C. notched impact fractured surface and along a longitudinal cross-section taken at ≥3 to ≤5 mm linear distance from the notch of ≥1.8 to ≤3.1 and a porosity area fraction measured in the same location as the numerical mean of the aspect ratio of at least 5%, or
- a combination thereof;
- or
- when the composition or reacted product thereof is formed into a tensile test bar according to ISO 527 and fractured at room temperature in accordance with ISO 527, it exhibits an internal microstructure having ≥4% porosity area fraction and an aspect ratio (pore major axis/minor axis) at a halfway point between the fracture surface and the grip sections and at the start of the grip sections of ≥1.6 to ≤3.0;
- or
- a combination thereof.
Dependencies are inferred from the claim text.