Rotomoulded articles prepared from a blend of polyethylene powders

Patent metadata

Field	Value
Publication number	US-9815228-B2
Application number	US-92212606-A
Country	US
Kind code	B2
Filing date	Jun 21, 2006
Priority date	Jun 22, 2005
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

The present invention discloses the use of a dry blend comprising a polyethylene resin and a functionalized polyolefin or ionomer in a composition with a thermoplastic resin in order to produce a layer that provides adhesion, fire resistance and low permeation rate in a multi layer rotomolded article.

First claim

The invention claimed is:

1. A single layer rotomoulded article prepared from a dry blend of
a) from 10 to 90 wt % based on the weight of the blend, of a first composition consisting of from 40 to 90 wt % based on the weight of the first composition of a first powder or micropellets composition consisting of from 50 to 99.9 wt % based on the weight of the first powder of a linear low density ethylene co-polymer and of from 0.1 to 50 wt % of a functionalised polyolefin or an ionomer or a combination thereof and of from 10 to 40 wt % based on the weight of the first composition of a second resin in powder or micropellets form prepared from the or the linear low density ethylene co-polymer wherein the second resin is dry blended with the first resin;
b) from 10 to 90 wt % based on the weight of the blend of a second composition prepared from a thermoplastic resin comprising polyamide.

2. A single layer article comprising a powder or micropellets blend comprising:
a) from 40 to 90 wt % based on the weight of the blend of a first resin in powder or micropellets composition of from 50 to 99.9 wt % based on the weight of composition a) of a homopolymer of ethylene having a melt index ranging from 0.1 to 50 dg/min and of from 0.1 to 50 wt % based on the weight of composition a) of a functionalised polyolefin or an ionomer or a combination thereof; and
b) from 10 to 40 wt % based on the weight of the blend of a second resin in powder or micropellets form prepared from the homopolymer of ethylene;
wherein resin powder b) is dry blended with composition powder a), and wherein about 50 wt % of the blend comprises metallocene-catalyzed polyethylene.

3. The single layer article of claim 2 wherein said article is rotomoulded.

4. The single layer article of claim 2 wherein said article is a pipe coating.

5. A single layer article comprising a composition comprising a resin in powder or micropellets form of from 50 to 99.9 wt % based on the weight of the composition of a homopolymer of ethylene having a melt index ranging from 0.1 to 50 dg/min and of from 0.1 to 50 wt % based on the weight of the composition of an ionomer or a functionalised polyolefin and an ionomer, wherein the resin is dry blended with a second resin in powder or micropellets, and wherein the second resin comprises the homopolymer of ethylene; and wherein about 50 wt % of the composition is metallocene catalyzed polyethylene.

6. The single layer article of claim 5 wherein the composition comprises the ionomer and a grafted polyethylene.

7. The single layer article of claim 5 wherein said article is rotomoulded.

8. The single layer article of claim 5 wherein said article is a pipe coating.

9. The single layer article of claim 2 , wherein the homopolymer of ethylene has bimodal or multimodal molecular weight distribution.

10. The single layer article of claim 5 , wherein the homopolymer of ethylene has bimodal or multimodal molecular weight distribution.

11. The single layer rotomoulded article of claim 1 , wherein about 50% of the weight of the polyethylene in the blend is metallocene-catalyzer polyethylene.

Assignees

• Maziers Eric
• Total Res & Technology Feluy

Inventors

• Maziers Eric

Classifications

• B29C41/003 Primary

  characterised by the choice of material · CPC title

• B29C41/04 Primary

  Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould · CPC title

• Y10T428/31757

  Polymer of monoethylenically unsaturated hydrocarbon · CPC title

• B29C41/22

  Making multilayered or multicoloured articles · CPC title

• B29C31/06

  in measured doses {, e.g. by weighting (feeding mixers with measured doses B01F35/714, B01F35/882, B29B7/24, B29B7/603)} · CPC title