Low density polyethylene with high elongation hardening

Patent metadata

Field	Value
Publication number	US-10364306-B2
Application number	US-201515514788-A
Country	US
Kind code	B2
Filing date	Sep 9, 2015
Priority date	Oct 1, 2014
Publication date	Jul 30, 2019
Grant date	Jul 30, 2019

Abstract

The present disclosure provides a low density polyethylene (LDPE) having (A) a density from 0.910 to 0.924 g/cm 3 , determined according to ISO 1183 at 23° C.; (B) an elongational hardening of at least 4.2, at 150° C. at an elongational rate of 1 s −1 ; (C) a ratio Mw/Mn of at least 18, where (i) Mw is the weight average molar mass, measured by a MALLS detector coupled to a GPC, and (ii) Mn is the number average molar mass, measured by GPC (Gel Permeation Chromatography); and (D) a Mw of at least 230,000 g/mol. The present disclosure also provides an article of manufacture made from or containing (A) a substrate and (B) a coating layer made from or containing the disclosed LDPE. The present disclosure further provides a polymerization process occurring (A) in the presence of oxygen as the only radical initiating agent and (B) in the absence of solvents.

First claim

What is claimed is:

1. A low density polyethylene comprising:
A) a density from about 0.910 to about 0.924 g/cm 3 , determined according to ISO 1183 at 23° C.;
B) an elongational hardening of at least about 4.2, at 150° C. at an elongational rate of 1 s −1 ;
C) a ratio Mw/Mn of at least about 18, where
(i) Mw is the weight average molar mass, measured by a MALLS detector coupled to a GPC, and
(ii) Mn is the number average molar mass, measured by GPC (Gel Permeation Chromatography); and

D) Mw from about 230,000 g/mol to about 400,000 g/mol.

2. The low density polyethylene of claim 1 , wherein the low density polyethylene is selected from the group consisting of ethylene homopolymers, ethylene copolymers and mixtures thereof.

3. The low density polyethylene of claim 1 , wherein the low density polyethylene has an elongational hardening of at least about 4.5, at 150° C. at an elongational rate of 5 s −1 .

4. The low density polyethylene of claim 1 , wherein the low density polyethylene has a gpcBR value of at least about 1.5.

5. The low density polyethylene of claim 1 , wherein the low density polyethylene has a melt flow rate (MFR) according to ISO 1133 (190° C., 2.16 kg) from about 1.5 to about 15 g/10 min.

6. An article of manufacture comprising:
A) a substrate, and
B) a coating layer, wherein the coating layer comprises a low density polyethylene (LDPE) and wherein the LDPE has:
(i) a density from about 0.910 to about 0.924 g/cm 3 , determined according to ISO 1183 at 23° C.;
(ii) an elongation hardening of at least about 4.2, at 150° C. at an elongational rate of 1 s −1 ;
(iii) a ratio Mw/Mn of at least 18, wherein
(1) Mw is the weight average molar mass, measured by a MALLS detector coupled to a GPC, and
(2) Mn is the number average molar mass, measured by GPC (Gel Permeation Chromatography); and

(i) Mw from about 230,000 g/mol to about 400,000 g/mol.

7. A polymerization process for making a low density polyethylene (LDPE) comprising:
A) a step of free radical polymerizing reactants, wherein the LDPE comprises
(i) a density from about 0.910 to about 0.924 g/cm 3 , determined according to ISO 1183 at 23° C.;
(ii) an elongational hardening of at least about 4.2, at 150° C. at an elongational rate of 1 s −1 ;
(iii) a ratio Mw/Mn of at least about 18, wherein
(1) Mw is the weight average molar mass, measured by a MALLS detector coupled to a GPC,
(2) Mn is the number average molar mass, measured by GPC (Gel Permeation Chromatography), and

(iv) Mw from about 230,000 g/mol to about 400,000 g/mol

wherein the process occurs
A) in the presence of oxygen as the only radical initiating agent, and
B) in the absence of a solvent.

8. The polymerization process of claim 7 , wherein the step of free-radical polymerizing reactants occurs in a tubular reactor.

9. The polymerization process of claim 7 , further comprises a step of feeding a polymerization gas to the reactor at a pressure from about 1400 to less than about 1900 bar.

10. The polymerization process of claim 7 , where in the step of free-radical polymerizing occurs in a temperature range of from about 150 to about 320° C.

Assignees

• Basell Polyolefine Gmbh

Inventors

• Weiand Sebastian
• Gonioukh Andrei
• Schmitz Stephan
• Finette Andre-Armand
• Bürger Guido
• Küpper Guido
• Herrmann Thomas
• Vittorias Iakovos
• Lilge Dieter
• Mannebach Gerd

Classifications

• B32B27/10

  of paper or cardboard · CPC title

• B32B2307/72

  Density · CPC title

• B32B2270/00

  Resin or rubber layer containing a blend of at least two different polymers · CPC title

• C08F110/02 Primary

  Ethene · CPC title

• B05D1/265 Primary

  Extrusion coatings · CPC title