Polypropylene polymer composition having high stiffness properties
AssigneeW. R. Grace & Co.-Conn.
InventorsJohn KAARTO, Jing ZHONG, Amaia MONTOYA-GONI
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Abstract
Polypropylene polymer compositions are disclosed that have excellent stiffness properties. The polypropylene polymer compositions are made by combining a first polypropylene polymer with a second polypropylene polymer. The combination of polymers has been found to produce a composition having high stiffness properties in addition to excellent toughness properties. In addition, the polymer composition has good flow properties for being molded into various products and articles. Of particular advantage, the different polypropylene polymers can be produced at relatively high catalyst activity, especially in comparison to high crystalline polymers made in the past.
Claims26
A polypropylene polymer composition comprising:
- a first polypropylene polymer combined with a second polypropylene polymer, the first polypropylene polymer having a melt flow rate of from about 0.1 g/10 min to about 3 g/10 min and having a xylene soluble content of from about 1.0% by weight to about 7% by weight, the second polypropylene polymer having a melt flow rate of from about 5 g/10 min to about 100 g/10 min and having a xylene soluble content of from about 1% by weight to about 7% by weight;
- and
- wherein the polypropylene polymer composition has a flexural modulus according to the following formula:
- FX≥2072·XS−0.18
- wherein FX is the flexural modulus and XS is the xylene soluble content of the polypropylene polymer composition, the xylene soluble content of the polypropylene polymer composition being from about 2.5% to about 7% by weight.
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Dependencies are inferred from the claim text.