Controlled rheology formulations containing high melt strength polypropylene for extrusion coating
AssigneeEquistar Chemicals, LP
InventorsChun Lee, Dinshong Dong, Charles S. Holland, James R. Beren, Anthony J. De Nicola, Jr.
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Abstract
A process of extruding a blend of an irradiated first propylene polymer and a non-irradiated second propylene polymer, where the first propylene polymer comprises a non-phenolic stabilizer. The irradiation of the first propylene polymer extrudate is conducted in a reduced oxygen environment, and the irradiated first propylene polymer and the non-irradiated second propylene polymer are blended at a temperature below their respective melting points. The blend has a viscosity retention of 20 to 35%.
Claims15
A process comprising extruding a blend of an irradiated first propylene polymer comprising a non-phenolic stabilizer and a non-irradiated second propylene polymer, wherein the irradiation of the first propylene polymer was conducted in the presence of oxygen, and the irradiated first propylene polymer and the non-irradiated second propylene polymer were blended at a temperature below the melting point of the first and second propylene polymers, wherein the blend has a viscosity retention of 20 to 35%.
A process comprising:
- blending an irradiated first propylene polymer comprising a non-phenolic stabilizer, and a non-irradiated second propylene polymer, at a temperature below the melting point of the first and second propylene polymers, thereby forming a polymer blend, wherein the irradiation of the first propylene polymer was conducted in the presence of oxygen;
- extruding the polymer blend to form a film;
- and
- coating the film onto a substrate selected from paper, paperboard, fabrics or metal foils wherein the polymer blend has a viscosity retention of 20 to 35%.
A process for preparing a polymer composition comprising:
- blending an irradiated first propylene polymer comprising a non-phenolic stabilizer with a non-irradiated second propylene polymer, wherein the irradiation of the first propylene polymer was conducted in the presence of oxygen,
- wherein the irradiated first propylene polymer and the non-irradiated second propylene polymer were blended at a temperature below the melting point of the first and second propylene polymers, and wherein the blend has a viscosity retention of 20 to 35%.
Dependencies are inferred from the claim text.