Chlorinated PVC blends

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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Details

525235, 525238, 525240, 525242, 525243, C08L 2706

Patent

active

052740439

ABSTRACT:
Blend compositions and process are provided comprising admixing of chlorinated polyvinyl chloride and polyvinyl chloride, each having specified inherent viscosity wherein the difference in the inherent viscosity of the polyvinyl chloride of the blend, measured in similar accordance with ASTM-D1243 is at least 0.2 units higher than the precursor polyvinyl chloride for the chlorinated polyvinyl chloride of the blend. Preferably the I.V. of the polyvinyl halide is from 0.2 to 1.0 units higher with the most preferred difference in I.V. (.DELTA.I.V.) being 0.35 to 0.65 units so as to yield a balance of property improvements including tensile strength, impact resistance, heat distortion temperature and weatherability. The compositions also can further comprise a Tg enhancing agents which otherwise embrittle conventional PVC compounds. The blends of the present invention are processible by a variety of techniques including injection molding, extrusion, calendering, thermoforming, compression molding and the like to form useful articles such as molded sheets, trays, shrouds as for fans, appliance parts and covers, electrical outlets, business machine housings, piping telecommunication equipment, automotive components, and numerous others.

REFERENCES:
patent: 4304884 (1981-12-01), Okamoto
patent: 4745156 (1988-05-01), Yoshihara et al.
patent: 5086122 (1992-02-01), Lawson et al.

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