No break polypropylene impact copolymers with melt flow rate higher than 90 g/10 min

Patent metadata

Field	Value
Publication number	US-11667779-B2
Application number	US-202217872802-A
Country	US
Kind code	B2
Filing date	Jul 25, 2022
Priority date	Feb 19, 2019
Publication date	Jun 6, 2023
Grant date	Jun 6, 2023

Abstract

Polymer compositions may include a matrix phase comprising a polypropylene-based polymer; and an elastomeric rubber phase; wherein the polymer composition has melt flow rate (MFR) according to ASTM D1238 at 230° C./2.16 kg equal to or greater than 90 g/10 min and at least one feature selected from (I) an Izod impact resistance according to ASTM D256A at 23° C. equal to or greater than 400 J/m; (II) an instrumented drop impact at −30° C., average total energy, equal to or greater than 17 J; or (III) an instrumented drop impact at −30° C., average percent ductility, equal to or greater than 60%.

First claim

What is claimed is:

1. A polymer composition, comprising:
a matrix phase comprising a polypropylene-based polymer; and
an elastomeric rubber phase comprising a propylene copolymer comprising equal to or less than 35 wt % of one or more comonomers,
wherein the polymer composition has melt flow rate (MFR) according to ASTM D1238 at 230° C./2.16 kg equal to or greater than 90 g/10 min and a fraction of solubles in xylene according to ASTM D5492 equal to or greater than 20 wt %,
wherein the polymer composition has been modified by visbreaking with a peroxide agent.

2. The polymer composition of claim 1 , wherein the matrix phase comprises a polypropylene-based polymer selected from a group consisting of polypropylene homopolymer and polypropylene copolymer comprising equal to or less than 5 wt % of one or more comonomers selected from a group consisting of ethylene and C4 to C10 alpha-olefins.

3. The polymer composition of claim 1 , wherein the one or more comonomers are selected from a group consisting of ethylene and C4 to C10 alpha-olefins.

4. The polymer composition of claim 3 , wherein the comonomer in the elastomeric rubber phase is ethylene.

5. The polymer composition of claim 1 , wherein the peroxide agent is one or more selected from a group consisting of 2,5-Dimethyl-2,5-di(tert-butylperoxy)hexane, dicumyl peroxide, and tert-butyl dicumylperoxide.

6. The polymer composition of claim 1 , wherein the polymer composition has a melt flow rate (MFR) according to ASTM D1238 at 230° C./2.16 kg, before visbreaking, ranging from 10 g/10 min to 50 g/10 min.

7. The polymer composition of claim 1 , wherein the polymer composition has a melt flow rate (MFR) according to ASTM D1238 at 230° C./2.16 kg, before visbreaking, ranging from 25 g/10 min to 35 g/10 min.

8. The polymer composition of claim 1 , wherein the polymer composition has an amorphous intrinsic viscosity (IV) measured according to ASTM D445 in decaline at 135° C., before visbreaking, between 1.9 dL/g and 3.6 dL/g.

9. The polymer composition of claim 1 , wherein the polymer composition has an amorphous intrinsic viscosity (IV) measured according to ASTM D445 in decaline at 135° C., after visbreaking, between 0.9 dL/g and 2.2 dL/g.

10. The polymer composition of claim 1 , wherein the polymer composition has an Izod impact according to ASTM D256A at −20° C. in the range of 55 J/m to 150 J/m.

11. The polymer composition of claim 1 , wherein the polymer composition has a molecular weight (Mz) in the range of 400 kDa to 600 kDa, after visbreaking.

12. The polymer composition of claim 1 , wherein the polymer composition exhibits a tensile stress at yield according to ASTM D638 in the range of 14 MPa to 22 MPa.

13. The polymer composition of claim 1 , wherein the polymer composition exhibits a flexural modulus secant at 1% according to ASTM D790 in the range of 600 MPa to 950 MPa.

14. The polymer composition of claim 1 , wherein the polymer composition comprises antioxidants, pigments, fillers, reinforcements, adhesion-promoting agents, biocides, whitening agents, nucleating agents, anti-statics, anti-blocking agents, processing aids, flame-retardants, plasticizers, and light stabilizers.

15. An article comprising the polymer composition according to claim 1 .

16. The article of claim 15 , wherein the article is prepared by a method selected from a group consisting of extrusion molding, coextrusion molding, extrusion coating, injection molding, cast film extrusion, blown film extrusion, foaming, extrusion blow-molding, injection stretched blow-molding, rotomolding, pultrusion, calendering, additive manufacturing, and lamination.

Assignees

• Braskem Sa

Inventors

• Werlang Moisés Magalhães
• Carr Joel
• Forest Tadeu

Classifications

• C08L2207/02

  Heterophasic composition · CPC title

• C08L23/12 Primary

  Polypropene · CPC title

• C08F210/16

  Copolymers of ethene with alpha-alkenes, e.g. EP rubbers · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• C08L2308/00

  Chemical blending or stepwise polymerisation process with the same catalyst · CPC title