Process for recycling polyolefin blend composition using an ethylene copolymer compatibilizing agent
View Patent ↗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 C 4 -C 8 unsaturated anhydrides, monoesters of C 4 -C 8 unsaturated acids having at least two carboxylic acid groups, diesters of C 4 -C 8 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.
1. A process for preparing a shaped article from a composite material which comprises the steps of
A. preparing a composite material by a process comprising the steps of
1. forming a composition by combining
a. a polymer blend comprising
(1) a first polymer selected from the group consisting of polyethylenes and copolymers of ethylene and a C 3 -C 10 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 C 4 -C 8 unsaturated anhydrides, monoesters of C 4 -C 8 unsaturated acids having at least two carboxylic acid groups, diesters of C 4 -C 8 unsaturated acids having at least two carboxylic acid groups and mixtures thereof;
wherein said 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; and
2. subjecting said composition to high shear mixing to form a homogeneous composite material; and
B. forming said composite material into a shaped article.
2. A process of claim 1 wherein said first polymer is a polyethylene.
3. A process of claim 1 wherein said first polymer is a copolymer of ethylene and a C 3 -C 10 alpha-olefin.
4. A process of claim 1 wherein said polar copolymer comprises copolymerized units of ethylene and a C 4 -C 8 unsaturated anhydride.
5. A process of claim 1 wherein said polar copolymer comprises copolymerized units of ethylene and a monoester of a C 4 -C 8 unsaturated acid having at least two carboxylic acid groups.
6. A process of claim 4 wherein said unsaturated anhydride is maleic anhydride.
7. A process of claim 5 wherein said monoester is ethyl hydrogen maleate.
8. A process of claim 1 wherein the moisture content of said polymer blend is greater than 300 ppm water, based on the total weight of said first and second polymers.
9. A shaped article prepared by the process of claim 1 .
10. A process of claim 1 wherein the composition additionally comprises a lubricant.