| abstract |
Isotactic polypropylene for fiber productionnwith increased resistance to photooxidation,nwhose durability is ensured by the combinationntwo phenolic antioxidantsndiffering in melting point and volatilitynand a polymer light stabilizernpiperidine type. Stabilizationna blend used in the production of polypropylenenconsists of 0.02 to 0.15 wt. % low molecular weightnvolatile phenolic antioxidantn2,6-di-tert-butyl-4-methylphenol, 0.02 ton0.15 wt. % high molecular weight, nonvolatilenphenolic isocyanurate antioxidantnwhich is 1,3,5-tris (3,5-di-tert-butyl-n-4-hydroxybenzylisocyanurate and 0.10 to 0.50nwt. % light stabilizer with stericnshielded amino group of polymeric piperidinentype. By a suitable combinationnthe contents of the individual components in the summaryna concentration of 0.14 to 0.80 wt. %npolypropylene for production can be preparednfibers designed for interior and exteriornapplications, unpainted and dyed in the mass,nshaped and smooth. |