Method of preparing styrene-maleic anhydride molding composition

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

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525285, C08F27902

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active

043363547

ABSTRACT:
A molding composition having advantageous toughness and impact resistance is prepared by polymerizing a mixture of styrene and maleic anhydride in the presence of and adapted to incorporate from about 5 to about 25% of a high impact polystyrene containing from about 4 to about 16% rubber, said high impact polystyrene having an average molecular weight which is significantly higher than the average molecular weight of the completed molding composition. The composition is especially useful in molding fiber-reinforced articles. The composition has outstanding toughness when green. That is, hot and freshly molded articles can be removed from the mold with minimized breakage, thus decreasing the amount of scrap arising from the breakage of a green molded item at the time of being ejected and/or removed from a mold. Moreover, the composition is moldable throughout a wide range of conditions and is less sensitive to changes in molding conditions.

REFERENCES:
patent: 4097551 (1978-06-01), DiGiulio
patent: 4221880 (1980-09-01), Fava
patent: 4223096 (1980-09-01), Lee

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