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US 12,227,605 B2Granted
High melt strength polypropylene
AssigneeBorealis AG
InventorNorbert Reichelt
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Abstract
The present invention is related to a high melt strength polypropylene (HMS-PP) comprising units derivable from at least one polyunsaturated fatty acid, a process for preparing said high melt strength polypropylene (HMS-PP), as well as an article comprising said high melt strength polypropylene (HMS-PP).
Claims13
A high melt strength polypropylene (HMS-PP), having a branching index g′ determined by GPC below 0.9 and comprising units derivable from:
- i) propylene, and
- ii) at least one polyunsaturated fatty acid,
- wherein the high melt strength polypropylene (HMS-PP) comprises 0.05 to 2.0 wt % of units derivable from at least one polyunsaturated fatty acid based on the overall weight of the high melt strength polypropylene (HMS-PP).
A process for the preparation of a high melt strength polypropylene (HMS-PP), comprising the steps of:
- a) providing a linear propylene polymer (L-PP),
- b) blending said propylene polymer (L-PP) with a coupling agent (CA) comprising a polyunsaturated fatty acid, and
- c) irradiating the mixture obtained in step b) by means of electron beam irradiation,
- wherein the mixture obtained in step b) comprises 0.1 to 2.0 wt % of the coupling agent (CA) comprising a polyunsaturated fatty acid, based on the overall weight of the mixture obtained in step b).
1 more element
Dependencies are inferred from the claim text.