Synergistic visbreaking composition of peroxide and hydroxylamine ester for increasing the visbreaking efficiency
AssigneeBorealis AG
InventorsJoachim Fiebig, Henk Van Paridon, Jingbo Wang, Markus Gahleitner
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Abstract
Synergistic visbreaking composition of peroxide and a hydroxylamine ester for increasing the visbreaking efficiency for polypropylene polymers at melt extrusion temperatures below 250° C. and its use in visbreaking polypropylene. The present invention is furthermore related to the use of such visbroken polypropylene polymers for producing melt blown non-wovens with improved barrier properties.
Claims15
A synergistic visbreaking composition of peroxide and a hydroxylamine ester for increasing the visbreaking efficiency for polypropylene polymers at melt extrusion temperatures below 250° C., comprising peroxide (i) and hydroxylamine ester (ii) in a range of from 1 wt % (i):99 wt % (ii) to 99 wt % (i):
- 1 wt % (ii)
- wherein the hydroxylamine ester is selected from the group consisting of sterically hindered amine derivatives of the formula:
- and the peroxide is selected from the group consisting of 2,5-dimethyl-2,5-bis(tert.butyl-peroxy)hexane, 2,5-dimethyl-2,5-bis(tert.butyl-peroxy)hexyne-3, dicumyl-peroxide, di-tert.butyl-peroxide, tert.butyl-cumyl-peroxide and bis (tert.butylperoxy-isopropyl)benzene.
(canceled)
A method comprising:
- forming melt blown non-wovens with improved barrier properties from polypropylene polymers being visbroken with a synergistic visbreaking composition comprising peroxide (i) and hydroxylamine ester (ii) in a range of from 1 wt % (i):99 wt % (ii) to 99 wt % (i):1 wt % (ii).
Dependencies are inferred from the claim text.