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Method of forming melt-blown non-wovens
US10982022B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10982022-B2 |
| Application number | US-201916658366-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 21, 2019 |
| Priority date | Dec 15, 2014 |
| Publication date | Apr 20, 2021 |
| Grant date | Apr 20, 2021 |
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Abstract
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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.
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The invention claimed is: 1. A method of forming melt blown non-wovens with improved barrier properties comprising a) providing a polypropylene homo- or copolymer, b) visbreaking said polypropylene homo- or copolymer by melt extrusion, whereby the melt extrusion temperature is from 200° C. to 245° C. in the presence of a synergistic visbreaking composition comprising peroxide (i) 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; and hydroxylamine ester (ii) selected from the group consisting of sterically hindered amine derivatives of the formula: whereby the amounts of peroxide (i) and hydroxylamine ester (ii) are in the range of from 50 wt % (i):50 wt % (ii) to 85 wt % (i):15 wt % (ii) thereby providing a visbroken polypropylene homo- or copolymer; and c) producing melt blown non-wovens from said visbroken polypropylene homo- or copolymer. 2. The method of claim 1 , in the absence of sulfur containing compounds. 3. The method of claim 1 , whereby peroxide (i) and/or hydroxylamine ester (ii) are used as a masterbatch/masterbatches. 4. The method of claim 1 , whereby peroxide (i) and/or hydroxylamine ester (ii) are added as mixture to the polypropylene homo- or copolymers to be visbroken. 5. The method of claim 1 , whereby peroxide (i) and/or hydroxylamine ester (ii) are added separately to the polypropylene homo- or copolymers to be visbroken.
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- What does patent US10982022B2 cover?
- 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.
- Who is the assignee on this patent?
- Borealis Ag
- What technology area does this patent fall under?
- Primary CPC classification C08F8/50. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Apr 20 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).