Polypropylene coating composition

Patent metadata

Field	Value
Publication number	US-12577385-B2
Application number	US-202117923335-A
Country	US
Kind code	B2
Filing date	May 26, 2021
Priority date	May 27, 2020
Publication date	Mar 17, 2026
Grant date	Mar 17, 2026

Abstract

The present invention relates to a polypropylene composition comprising a propylene random copolymer having—a melt flow rate MFR2 (230° C./2.16 kg) measured according to ISO 1133 of 15 to 40 g/10 min, —a melting temperature Tm as determined by DSC according to ISO 11357 of 115 to 145° C., and—a number of 2,1 and 3,1 regio defects of from 0.01 to 1.2 mol % as measured by 13C NMR, to an article coated with said composition, to a process for coating an article with said composition and to the use of said composition for coating an article.

First claim

The invention claimed is:

1 . A polypropylene composition comprising a propylene random copolymer having
a melt flow rate MFR 2 (230° C./2.16 kg) measured according to ISO 1133 of 17 to 40 g/10 min, a melting temperature T m as determined by DSC according to ISO 11357 of 115 to 145° C., a number of 2,1 and 3,1 regio defects of from 0.01 to 1.2 mol % as measured by 13 C NMR, and a xylene cold soluble (XCS) fraction as determined according to ISO 16152 of from 0.1 to below 15 wt. %.

2 . The polypropylene composition according to claim 1 wherein the propylene random copolymer has been produced in the presence of a single-site catalyst.

3 . The polypropylene composition according to claim 1 wherein the propylene random copolymer has a molecular weight distribution MWD as determined by GPC of 2.4 to 5.5 and/or has a hexane extractables contents as measured according to the FDA test of less than 2.0 wt. %.

4 . The polypropylene composition according to claim 1 wherein the propylene random copolymer has a molecular weight distribution MWD as determined by GPC of 2.5 to 4.5 and/or has a hexane extractables contents as measured according to the FDA test of less than 1.5 wt. %.

5 . The polypropylene composition according to claim 1 wherein the propylene random copolymer is having a melt flow rate MFR 2 (230° C./2.16 kg) measured according to ISO 1133 of 17 to 35 g/10 min, and/or a melting temperature T m as determined by DSC according to ISO 11357 of 120 to 140° C., and/or a number of 2,1 and 3,1 regio defects of from 0.1 to 1.0 mol % as measured by 13 C NMR.

6 . The polypropylene composition according to claim 1 wherein the propylene random copolymer is an ethylene propylene random copolymer.

7 . The polypropylene composition according to claim 1 wherein the propylene random copolymer has an ethylene content in the range of from 2.0 to 5.5 wt. %, or in the range of 2.2 to 4.5 wt. %.

8 . The polypropylene composition according to claim 1 wherein the propylene random copolymer has a crystallization temperature T c as determined by DSC according to ISO 11357 in the range of 75 to 110° C.

9 . The polypropylene composition according to claim 1 wherein the propylene random copolymer has a crystallization temperature T c as determined by DSC according to ISO 11357 in the range of 80 to 105° C. and/or has a xylene cold soluble (XCS) fraction as determined according to ISO 16152 of from 0.1 to below 7.5 wt. %.

10 . The polypropylene composition according to claim 1 wherein the propylene random copolymer has a flexural modulus as determined according to ISO 178 on injection moulded specimens of 500 to 1000 MPa.

11 . The polypropylene composition according to claim 1 wherein the random propylene copolymer comprises, or consists of, two polymer fractions (RACO-1) and (RACO-2) and the split between fractions (RACO-1) and (RACO-2) is from 30:70 to 70:30.

12 . A coated article having a coating layer which comprises the polypropylene composition according to claim 1 .

13 . A process for coating of an article in which a polypropylene composition according to claim 1 is coated onto an article by extrusion.

14 . The process or use according to claim 13 wherein the article is paper, paperboard, a fibrous substrate, and/or a metal foil.

15 . A polypropylene composition comprising a propylene random copolymer having
a melt flow rate MFR 2 (230° C./2.16 kg) measured according to ISO 1133 of 17 to 40 g/10 min, a melting temperature T m as determined by DSC according to ISO 11357 of 17 to 145° C., and a number of 2,1 and 3, 1 regio defects of from 0.01 to 1.2 mol % as measured by 13 C NMR, and a hexane extractables contents as measured according to the FDA test of less than 2.0 wt. %.

16 . The polypropylene composition according to claim 15 , wherein the propylene random copolymer has an ethylene content in the range of from 2.0 to 5.5 wt. %, or in the range of 2.2 to 4.5 wt. %.

17 . The polypropylene composition according to claim 15 , wherein the propylene random copolymer has a crystallization temperature T c as determined by DSC according to ISO 11357 in the range of 75 to 110° C.

18 . The polypropylene composition according to claim 15 , wherein the propylene random copolymer has a xylene cold soluble (XCS) fraction as determined according to ISO 16152 of from 0.1 to below 15 wt. %.

19 . A coated article having a coating layer which comprises the polypropylene composition according to claim 16 .

Assignees

• Borealis Ag
• Borealis Gmbh

Inventors

• Wang Jingbo
• Gahleitner Markus
• Bemreitner Klaus
• Leskinen Pauli
• Neidersuess Peter
• Nummila-Pakarinen Auli

Classifications

• C09D123/16

  Elastomeric} ethylene-propylene or ethylene-propylene-diene copolymers {, e.g. EPR and EPDM rubbers · CPC title

• C08L2314/06

  Metallocene or single site catalysts · CPC title

• B29K2023/16

  EPM, i.e. ethylene-propylene copolymers; EPDM, i.e. ethylene-propylene-diene copolymers; EPT, i.e. ethylene-propylene terpolymers · CPC title

• B29C48/154

  Coating solid articles, i.e. non-hollow articles · CPC title

• C08F2420/07

  Heteroatom-substituted Cp, i.e. Cp or analog where at least one of the substituent of the Cp or analog ring is or contains a heteroatom · CPC title