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US 8,524,821 B2Granted
Gamma radiation sterilizable, reinforced polymer composition with improved color stability
AssigneeSolvay Advanced Polymers, L.L.C.
InventorGeert Verfaillie
Life of this patent
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Abstract
Gamma radiation sterilizable, reinforced polymer composition (C) comprising: at least one semi-aromatic polyamide (PA), at least one filler (F) selected from platy fillers, acicular fillers and fibrous fillers, and at least one inorganic pigment (IP) having a Mohs hardness of at most 4.5 and a refractive index of at least 1.70.
Claims15
A gamma radiation sterilizable polymer composition (C) comprising:
- at least one semi-aromatic polyamide (PA) essentially all the recurring units of which are obtained by the polycondensation reaction of adipic acid and meta-xylylene diamine,
- at least one filler (F) selected from the group consisting of platy fillers, acicular fillers and fibrous fillers, and
- at least one inorganic pigment (IP) having a Mohs hardness of at most 4.5 and a refractive index of at least 1.70.
A method for increasing the resistance to gamma rays of a material, comprising adding at least one pigment to the material,
- said material being a polymer composition comprising at least one semi-aromatic polyamide (PA) essentially all the recurring units of which are obtained by the polycondensation reaction of adipic acid and meta-xylylene diamine and at least one filler,
- said filler being selected from the group consisting of platy fillers, acicular fillers, and fibrous fillers, and
- said pigment being selected from the group consisting of zinc sulfide, azurite, β-malachite, γ-malachite, pseudo-malachite, jarosite, massicot, orpiment, natrojarosite, realgar, vermillion, cinnabar, zinc sulfide in the wurtzite crystalline form, zinc sulfide in the sphalerite crystalline form, wurtzite, matraite, sphalerite, blende, cleiophane, cramerite, sachtolith, lithopone, red seal lithopone, silver seal lithopone, lead carbonate, cerussite, white lead, lead sulfate, lead silicate, zinc oxide, antimony trioxide, antimony trioxide, valentinite, barium sulfate, ultramarine blue, phthalocyanine green, rutile titanium dioxide, anatase titanium dioxide, zirconium dioxide, iron oxide red, and mixtures thereof.
Dependencies are inferred from the claim text.