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US 2024/0228685 A1Published application
High melt stength polypropylene
AssigneeBorealis AG
InventorNorbert REICHELT
Life of this patent
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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).
Claims16
1:
- 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.
2:
- The high melt strength polypropylene (HMS-PP) according to claim 1, 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).
3:
- The high melt strength polypropylene (HMS-PP) according to claim 1, wherein the at least one polyunsaturated fatty acid is linoleic acid and/or α-linolenic acid.
4:
- The high melt strength polypropylene (HMS-PP) according to claim 1, wherein the ratio x/(z−w) is in the range of 0.25 to 2.0, wherein x is the intensity of the 1H NMR signal (400 MHz, 1,2-tetrachloroethane-d2) at 5.55 to 5.27 ppm, z is the intensity of the 1H NMR signal (400 MHz, 1,2-tetrachloroethane-d2) at 4.85 to 4.73 ppm and w is the intensity of the 1H NMR signal (400 MHz, 1,2-tetrachloroethane-d2) at 4.73 to 4.66 ppm.
5:
- The high melt strength polypropylene (HMS-PP) according to claim 1, fulfilling in-equation (I);
- F
- 30
- (
- HMSPP
- )
- -
- F
- 200
- (
- HMSPP
- )
- F
- 30
- (
- HMSPP
- )
- ≤
- 0.15
- (
- I
- )
- wherein [F30(HMSPP)] is the F30 melt strength of the high melt strength polypropylene (HMS-PP) determined according to ISO 16790:2005 at 30 bar and [F200(HMSPP)] is the F200 melt strength of the high melt strength polypropylene (HMS-PP) determined according to ISO 16790:2005 at 200 bar.
20 more elements
6:
- The high melt strength polypropylene (HMS-PP) according to claim 1, wherein the high melt strength polypropylene (HMS-PP) has an additional F30 melt strength (AMS), determined according to ISO 16790:2005, compared to the F30 melt strength (LMS) of a linear polypropylene having the same melt flow rate MFR2, determined at 230° C. and a load of 2.16 kg according to ISO 1133, as the high melt strength polypropylene (HMS-PP), of above 2.0 cN, wherein the additional F30 melt strength (AMS) is determined according to equation (II);
- A
-
- M
-
- S
- =
- M
-
- S
-
- (
- H
-
- M
-
- S
- -
- P
-
- P
- )
- -
- L
-
- M
-
- S
- ,
- (
- II
- )
- wherein AMS is the additional F30 melt strength (AMS), determined according to ISO 16790:2005, compared to the F30 melt strength (LMS) of a linear polypropylene having the same melt flow rate MFR2, determined at 230° C. at a load of 2.16 kg according to ISO 1133, as the high melt strength polypropylene (HMS-PP) in [cN], MS(HMS-PP) is the F30 melt strength of the high melt strength polypropylene (HMS-PP), determined according to ISO 16790:2005 in [cN], LMS is the F30 melt strength (LMS) of a linear polypropylene having the same melt flow rate MFR2, determined at 230° C. at a load of 2.16 kg according to ISO 1133, as the high melt strength polypropylene (HMS-PP) in [cN],
- and wherein the F30 melt strength (LMS) is determined according to equation (III);
- L
-
- M
-
- S
- =
- 17.35
- MFR
- -
- 0.994
- ,
- (
- III
- )
- wherein MFR is the melt flow rate MFR2, determined at 230° C. at a load of 2.16 kg according to ISO 1133, of the high melt strength polypropylene (HMS-PP).
46 more elements
7:
- The high melt strength polypropylene (HMS-PP) according to claim 1, having a crystallization temperature Tc determined according to DSC below 120° C.
8:
- 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.
1 more element
9:
- The process according to claim 8, wherein the dosage of the electron beam radiation according to step c) is in the range of 50 to 150 kGy.
10:
- The process according to claim 8, wherein the mixture obtained in step b) comprises 0.01 to 5.0 wt % of the coupling agent (CA) comprising a polyunsaturated fatty acid, based on the overall weight of the mixture obtained in step b).
11:
- The process according to claim 8, wherein the coupling agent (CA) comprising a polyunsaturated fatty acid is native linseed oil.
12:
- A composition (C) comprising at least 10.0 wt %, based on the overall weight of the composition (C), of recycled high melt strength polypropylene (r-HMS-PP), being high melt strength polypropylene (HMS-PP) according to claim 1, which is recovered from a waste plastic material derived from post-consumer and/or industrial waste.
13:
- The composition (C) according to claim 12, wherein the melt flow rates MFR2, determined at 230° C. at a load of 2.16 kg according to ISO 1133, of the recycled high melt strength polypropylene (r-HMS-PP) and of the originating high melt strength polypropylene (o-HMS-PP), being the high melt strength polypropylene, the recycled high melt strength polypropylene (r-HMS-PP) is obtained from, fulfil in-equation IV:
- MFR
- 2
- (
- oHMSPP
- )
- MFR
- 2
- (
- rHMSPP
- )
- ≤
- 0.95
- IV
- wherein MFR2(oHMSPP) is the melt flow rate MFR2, determined at 230° C. at a load of 2.16 kg according to ISO 1133, of the originating high melt strength polypropylene (o-HMS-PP) and MFR2(rHMSPP) is the melt flow rate MFR2, determined at 230° C. at a load of 2.16 kg according to ISO 1133, of the recycled high melt strength polypropylene (r-HMS-PP).
12 more elements
14:
- The composition (C) according to claim 12, comprising additives (AD) selected from the group consisting of flame retardants, fillers, pigments, impact modifiers, antioxidants, nucleating agent, process stabilizers, slip agents, or mixtures thereof.
15:
- An article comprising the high melt strength polypropylene (HMS-PP) according to claim 1 or the composition (C) according to claim 12.
16:
- The process according to claim 8, 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).