Process for recycling polyolefin blend composition using an ethylene copolymer compatibilizing agent
AssigneeE. I. Du Pont de Nemours and Company
InventorDAVID M. DEAN
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Abstract
A process is provided for preparing polymer composites from compositions comprising i) a polyolefin, ii) a polymer selected from the group consisting of polymers having hydroxyl groups and polymers having amino groups and iii) a polar ethylene copolymer having copolymerized units selected from the group consisting of C4-C8 unsaturated anhydrides, monoesters of C4-C8 unsaturated acids having at least two carboxylic acid groups, diesters of C4-C8 unsaturated acids having at least two carboxylic acid groups and mixtures thereof. The process is suitable for use with recycle streams that contain polymeric materials that are laminates or composites of dissimilar polymers.
Claims9
An easily processable composition prepared by combining:
- A. a polymer blend comprising
- 1. a first polymer selected from the group consisting of polyethylenes and copolymers of ethylene and a C3-C10 alpha-olefin;
- and
- 2. a second polymer selected from the group consisting of ethylene vinyl alcohol polymers and mixtures of two or more thereof;
- wherein said polymer blend has a moisture content greater than 250 ppm water, based on the total weight of said first and second polymers;
- and
- B. a third polymer that is a polar copolymer produced by a high pressure random copolymerization process, said polar copolymer comprising copolymerized units of ethylene and from about 3 wt. % to about 25 wt. %, based on the weight of the polar copolymer, of a comonomer selected from the group consisting of C4-C8 unsaturated anhydrides, monoesters of C4-C8 unsaturated acids having at least two carboxylic acid groups, diesters of C4-C8 unsaturated acids having at least two carboxylic acid groups and mixtures thereof;
- wherein said processable composition comprises, based on the total weight of said first, second and third polymers, 55-98 wt. % of said first polymer, 2-45 wt. % of said second polymer and 0.1-10 wt. % of said third polymer.
Dependencies are inferred from the claim text.