Highly abrasion-resistant grafted polyolefin pipe
AssigneeE. I. Du Pont de Nemours and Company
InventorRichard Allen Hayes
Life of this patent
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Abstract
A pipe- or tube-shaped article comprising an innermost layer made from a grafted polyolefin composition is disclosed which can provide long lifetime, highly abrasion-resistant pipes for mining and other transportation uses. Methods for preparing the article and transporting abrasive materials through the article are also described.
Claims19
A pipe- or tube-shaped article having an innermost layer wherein the innermost layer has a thickness of about 3.2 to about 102 mm and comprises a grafted polyolefin, wherein the grafted polyolefin is the only polymer in the innermost layer;
- the grafted polyolefin is produced from a parent polyolefin comprising ethylene and an α-olefin with 3 to 20 carbons and grafted with about 0.005 to about 10 wt % of an α,β-ethylenically unsaturated carboxylic acid or anhydride;
- and
- the innermost layer does not comprise a tackifier.
A pipe- or tube-shaped article comprising an innermost layer and an outer layer wherein
- the innermost layer has a thickness of about 0.001 to about 102 mm and comprises a grafted polyolefin, wherein the grafted polyolefin is the only polymer in the innermost layer;
- the grafted polyolefin is produced from a parent polyolefin comprising ethylene and an α-olefin with 3 to 20 carbons and grafted with about 0.005 to about 10 wt % of an maleic anhydride;
- the parent polyolefin has a density of about 0.87 or lower;
- the innermost layer does not comprise a tackifier;
- and
- the outer layer comprises a fiber reinforcement material and optionally a thermoset resin.
A pipe- or tube-shaped article having an innermost layer wherein
- the innermost layer has a thickness of about 3.2 to about 102 mm and comprises a grafted polyolefin, wherein the grafted polyolefin is the only polymer in the innermost layer;
- the grafted polyolefin is produced from a parent polyolefin comprising ethylene and an α-olefin with 3 to 20 carbons and grafted with anhydride;
- and
- the innermost layer does not comprise a tackifier.
Dependencies are inferred from the claim text.