Propylene based terpolymer for containers

Patent metadata

Field	Value
Publication number	US-10316123-B2
Application number	US-201414896430-A
Country	US
Kind code	B2
Filing date	May 6, 2014
Priority date	Jun 6, 2013
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

A container comprising a propylene, ethylene, 1-hexene terpolymer wherein:
(i) the content of ethylene derived units ranges from 0.2 wt % to 1.0 wt %; (ii) the content of 1-hexene derived units ranges from 3.5 wt % to 5.5 wt %; (iii) the content of ethylene derived units fulfills the following equation (I);

C 2< C 6*0.16  (I);
wherein C2 is the content of ethylene derived units wt % and C6 is the content of 1-hexene derived units wt %; and (iv) the melt flow rate MFR measured according to ISO 1133, 230° C., 2.16 kg ranges from 15 to 80 g/10 min.

First claim

What is claimed is:

1. An injection molded container comprising a propylene, ethylene and 1-hexene terpolymer produced in the presence of a Ziegler-Natta catalyst wherein:
(i) the content of ethylene derived units ranges from 0.2-1.0 wt %;
(ii) the content of 1-hexene derived units ranges from more than 4 wt % to 5.5 wt %;
(iii) the content of ethylene derived units fulfills the following equation (I);
C 2< C 6*0.16  (I);

wherein C2 is the content of ethylene derived units in wt % and C6 is the content of 1-hexene derived units in wt %; and
wherein the terpolymer has a melt flow rate (MFR) measured according to ISO 1133 (230° C., 2.16 kg) of 15-80 g/10 min, a top load value higher than 180 N, wherein the top load value is measured using a container having a 0.4 mm thick wall, a hexane extractable value as measured according to FDA 21 77:1520 of lower than 1.9 wt % and a haze value of lower than 15.5% as measured on a 2 mm terpolymer plaque.

2. The injection molded container of claim 1 , wherein the content of 1-hexene derived units ranges from 3.8-5.0 wt %.

3. The injection molded container of claim 1 , wherein the content of ethylene derived units ranges from 0.3-0.8 wt %.

4. The injection molded container of claim 1 , wherein equation (I) is C2<C6*0.13.

5. The injection molded container of claim 1 , wherein the melt flow rate, MFR, measured according to ISO 1133, 230° C., 2.16 kg, ranges from 20-50 g/10 min.

6. The injection molded container of claim 1 , wherein the container comprises a wall thickness of 0.4 mm and exhibits an impact test value at 23° C. of higher than 4.5 J.

7. The injection molded container of claim 1 , wherein the top load value is higher than 200 N.

8. The injection molded container of claim 1 , wherein the hexane extractable value as measured according to FDA 21 77:1520 is lower than 1.87 wt %.

Assignees

• Basell Polyolefine Italia S R L
• Basell Poliolefine Italia Srl

Inventors

• Destro Mara
• Ciarafoni Marco
• Massari Paola
• Squarzoni Stefano
• Bohm Thomas

Classifications

• B65D1/0207

  characterised by material, e.g. composition, physical features · CPC title

• C08F2500/26

  Use as polymer for film forming · CPC title

• C08F210/06 Primary

  Propene · CPC title

• C08F210/16

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

• C08F2500/12

  Melt flow index or melt flow ratio · CPC title