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US 6,660,808 B2Granted
Polypropylene impact copolymer having bimodal sized rubber particles
AssigneeSunoco, Inc. (R&M)
InventorSehyun Kim
Life of this patent
Estimating the term…
Abstract
Polypropylene impact copolymers and methods of making them are provided. These impact copolymers achieve a balance between stiffness and impact strength and additionally higher gloss by the inclusion therein of a bimodal distribution of rubber particles.
Claims5
A composition consisting essentially of:
- a blend of:
- at least about 80% of a first propylene/ethylene impact copolymer having a first ethylene content and having dispersed therein a first plurality of rubber particles of a first size;
- a second propylene/ethylene impact copolymer having a second ethylene content, and having dispersed therein a second plurality of rubber particles of a second size, the second size being greater than the first size, and
- a third propylene/ethylene impact copolymer having a third ethylene content, and having dispersed therein a third plurality of rubber particles of a third size, the third size being greater than the first size.
1 more element
A method of making an impact copolymer, said method comprising:
- blending
- a first propylene/ethylene impact copolymer having a first ethylene content and having dispersed therein a first plurality of rubber particles of a first size;
- a second propylene/ethylene impact copolymer having a second ethylene content and having dispersed therein a second plurality of rubber particles of a second size, the second size being greater than the first size;
- and
- a third propylene/ethylene impact copolymer having a third ethylene content and having dispersed therein a third plurality of rubber particles of a third size, the third size being greater than the first size,
- wherein said first propylene/ethylene impact copolymer comprises at least about 80% of said impact copolymer.
3 more elements
Dependencies are inferred from the claim text.