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US 8,802,774 B2Granted
Block composites and impact modified compositions
AssigneeDow Global Technologies LLC
InventorsEdmund M. Carnahan, Colin LiPiShan, Kim L. Walton, Gary R. Marchand, Benjamin C. Poon, Phillip D. Hustad, Brian A. Jazdzewski, Didem Oner-Deliormanli
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Abstract
Embodiments of the invention provide block composites comprising a soft copolymer, a hard polymer and a block copolymer having a soft segment and a hard segment, wherein the hard segment of the block copolymer is the same composition as the hard polymer in the block composite and the soft segment of the block copolymer is the same composition as the soft copolymer of the block composite and their use as impact modifiers.
Claims11
A formulated composition comprising:
- a) polypropylene;
- b) a compatibilizer;
- and,
- c) an elastomer
- wherein the composition exhibits an Izod strength in kJ/m2 as measured by ASTM D256 or ISO180 at 0° C. or 23° C. that is at least 10% higher than that of the composition without (b);
- and exhibits a flexural modulus that is less than 10% reduced as compared to that of the composition without (b)
- wherein the compatibilizer comprises a block composite wherein the block composite comprises a soft copolymer, a hard polymer and a diblock copolymer having a soft segment and a hard segment, wherein the hard segment of the block copolymer is the same composition as the hard polymer in the block composite and the soft segment of the block copolymer is the same composition as the soft copolymer of the block composite;
- and wherein the block composite has an Mw/Mn of 1.7 to 3.5, the blocks of the diblock copolymers are joined end-to-end and the hard polymer comprises propylene units present in an amount greater than 90 mol percent.
5 more elements
Dependencies are inferred from the claim text.