Polyolefin Polymers With Increased Melt Strength
AssigneeW. R. Grace & Co.-Conn.
InventorsAmaia Montoya, Jing Zhong
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Abstract
A polymer composition with increased melt strength is disclosed. The polymer composition contains at least one polypropylene polymer combined with at least one melt strength modifier. The melt strength modifier can comprise a sorbitol derivative in an amount sufficient to change the melt strength characteristics and properties of the polymer. The polymer composition can be used in thermoforming processes and to produce polymer foams. The melt strength modifier can increase the melt strength of the polymer without having to induce branching in the polypropylene polymer.
Claims24
A polymer composition with increased melt strength comprising:
- a polypropylene polymer blended with a melt strength modifier, the melt strength modifier being present in the polymer composition in an amount sufficient to create a penetration network when the polymer composition is heated to a molten state.
A method for increasing the melt strength of a polypropylene polymer comprising:
- blending with a polypropylene polymer a melt strength modifier to form a polymer composition, the melt strength modifier being present in the polymer composition in an amount sufficient for the polymer composition to have a strain hardening index of greater than about 0.4 and a shear thinning factor of greater than about 100, an elastic index of greater than 0.2 and a viscoelastic transition temperature of greater than 180° C.
Dependencies are inferred from the claim text.