Foamed film comprising polyethylene foam

Patent metadata

Field	Value
Publication number	US-2016137804-A1
Application number	US-201414899213-A
Country	US
Kind code	A1
Filing date	Jun 17, 2014
Priority date	Jun 20, 2013
Publication date	May 19, 2016
Grant date	—

Abstract

The invention is directed to foamed film comprising a polyethylene foam obtained by physically foaming of a low density polyethylene copolymer with a density between 910 kg/m 3 and 935 kg/m 3 (according to ISO 1183) and a melt index between 0.10 and 100 dg/minute (according to ASTM D1133) wherein the low density polyethylene is obtained by a high pressure polymerisation process of ethylene in the presence of a di- or higher functional monomer.

First claim

1 . A foamed film comprising: at least one layer with polyethylene foam obtained by physically foaming of low density polyethylene copolymer with a density between 910 kg/m 3 and 935 kg/m 3 (according to ISO 1183) and a melt index between 0.10 and 100 dg/minute (according to ASTM D1133) wherein the low density polyethylene is obtained by a high pressure polymerisation process of ethylene in the presence of a di-or higher functional monomer.

2 . The foamed film according to claim 1 wherein the low density polyethylene is obtained by a high pressure polymerisation process of ethylene in the presence of 1,4-butanediol dimethacrylate as co monomer.

3 . The foamed film according to claim 1 , wherein the high pressure polymerisation process is a tubular polymerisation process.

4 . The foamed film according to claim 1 , wherein the foamed film comprises low density polyethylene foam resin based on 95.5% by weight-99.5% by weight low density polyethylene and 0.5% by weight-4.5% by weight high density polyethylene.

5 . The foamed film according to claim 1 , wherein the foamed film is a monolayer foamed film.

6 . The foamed film according to claim 1 , wherein the foamed film is a multilayer foamed film.

7 . The foamed film according to claim 6 wherein the multilayer foamed film comprises a foamed core layer, an intermediate layer located on both sides thereof and an outer layer located on both sides of the intermediate layer or the core layer wherein the foamed core layer consists of LDPE or wherein the foamed core layer comprises a blend of LDPE and LLDPE.

8 . The foamed film according to claim 7 wherein the intermediate layer comprises a blend of LDPE with LLDPE and/or HDPE and wherein the outer layer comprises a blend of LDPE with LLDPE and/or HDPE.

9 . An article prepared using the foamed film according to claim 1 .

10 . the article of claim 9 , wherein the article is at least one of greenhouse film, consumer trash bag, grocery bag, produce bag, pallet wrap, food wrap, liners, heavy duty bag, industrial bag, consumer bag, shrink film, label, pouche, tape, stand-up pouches, lamination film, protective film, health and hygiene film.

Assignees

• Van Der Ven Emanuel Joseph Herman Marie
• Van Der Meer Patrick
• Meer Douw Wiebe V D
• Krist Johan Maria
• Baccaro Lucio
• Saudi Basic Ind Corp
• Sabic Global Technologies Bv

Inventors

• Van Der Ven Emanuel Joseph Herman Marie
• Van Der Meer Patrick
• Van Der Meer Douwe Wiebe
• Krist Johan Maria
• Baccaro Lucio

Classifications

• B32B27/32

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title

• B32B2250/242

  All polymers belonging to those covered by group B32B27/32 · CPC title

• B32B5/18

  characterised by features of a layer {of} foamed material · CPC title

• B32B2250/03

  3 layers · CPC title

• C08J9/122 Primary

  Hydrogen, oxygen, CO2, nitrogen or noble gases · CPC title