Polypropylene compositions of improved clarity

Details Polypropylene compositions of improved clarity Polypropylene compositions of improved clarity

C - Chemistry, Metallurgy

08

K

402/592

C08K 5/00 (2006.01) C08K 5/09 (2006.01) C08K 5/098 (2006.01) C08K 5/17 (2006.01) C08L 23/10 (2006.01)

Patent

CA 1269488

POLYPROPYLENE COMPOSITIONS OF IMPROVED CLARITY ABSTRACT Incorporation of an ethoxylated amine in a sodium benzoate nucleated propylene polymer resin synergistically improves clarity as well as yellowness over what is achieved by use of sodium benzoate or ethoxylated amine alone. BACKGROUND OF THE INVENTION The present invention relates to a method of improving the clarity and yellowness of propylene polymers produced in the presence of support- based, high activity coordination catalysts. These polymers generally do not require deashing prior to use and therefore contain acidic catalytic residues which need to be neutralized prior to processing of the polymer. In order to improve the polymer clarity, sodium benzoate can be added as a nucleating agent, however, because of the presence of catalytic residues and neutralizing agents in the polymer, the improvement in clarity has not been as great as what would be desired. Also, the polymer color as measured by the yellowness index, has not been quite satisfactory. THE INVENTION In accordance with this invention, there is provided a method for synergistically improving the clarity and color of an undeashed propylene polymer prepared in the presence of a high-activity catalyst composition containing a magnesium halide-supported titanium halide catalyst component, adding sodium benzoate and an ethoxylated amine to the polymer in the ab- sence of calcium stearate, melting the resulting mixture and solidifying the melted mixture. It was unexpectedly found that the incorporation of an ethoxylated amine into the sodium benzoate-nucleated polypropylene resin improved the clarity, as measured by percent haze, and reduced the yellowness index in a synergistic manner, i.e., these properties were far better than what could be predicted from those obtained by use of sodium benzoate alone and ethoxylated amine alone.

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