Polyolefin-condensation polymer blend
AssigneeBorealis A/S
InventorsJari Aarila, Elina Koski
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Abstract
A process for the preparation of a plastics blend which contains a polyolefin-condensation polymer blend, in the first step of which process a crystalline polyolefin component and a low-crystallinity polyolefin component are functionalized in one process step by grafting thereto a functional monomer and by pre-dispersing the polyolefins with each other, and in the second step the functionalized polyolefin component is mixed with a condensation polymer and, when so desired, with a non-functionalized olefin polymer, and with other components of the plastics blend.
Claims12
A process for the preparation of a polyolefin-condensation polymer blend, the polyolefin component of the blend being made up of both a crystalline polyolefin and a low-crystallinity polyolefin, wherein the polyolefin-condensation polymer blend is prepared in two steps, of which the first step comprises
- performing a functionalization of the polyolefin component, wherein said functionalization comprises
- (a) grafting the crystalline polyolefin with a functional monomer in a molten state;
- and
- (b) crafting the low-crystalline polyolefin with the functional monomer in a molten state, wherein the step of grafting the low-crystalline polyolefin is performed after the commencement of the step of grafting the crystalline polyolefin, and wherein the functional monomer contains at least one carbon-carbon double bond and a functional epoxy, hydroxy, anhydride, amine, amide, isocyanate, imide, silane or carboxylic group or corresponding metal complex,
- thereby forming a pre-dispersion of functionalized polyolefins;
- and the second step comprises
- mixing the functionalized polyolefin component with the condensation polymer component of the polymer blend or with the condensation polymer component and a non-functionalized olefin polymer.
A process according to any of the above claims, wherein the thermomechanical proportions of the polyolefin-condensation polymer blend is adjusted by a changing of the proportions of the crystalline and the low-crystallinity polyolefins in the polyolefin component.
Dependencies are inferred from the claim text.