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US 8,575,247 B2Granted
High flow polyvinyl halide compound and methods of making and using same
AssigneePolyOne Corporation
InventorsSaleem Shakir, Sang Lee
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Abstract
A high flow polyvinyl halide compound is disclosed. The compound employs conventional ingredients plus a combination of phosphite stabilizer and hydrotalcite stabilizer which improve the melt flow index of the compound by at least 20%, as compared with a compound without the two types of stabilizers. The dramatically improved melt flow allows a molding cycle time reduction by as much as 22% because of a five-fold reduction in the fill step.
Claims20
A high flow polyvinyl halide compound for use in injection molding and having a melt flow index, comprising:
- (a) polyvinyl halide resin having an inherent viscosity of from about 0.58 to about 0.78 dl/g, as measured by using 0.2 grams of resin in 100 ml of cyclohexanone at 30 degrees C. by ASTM D 1243;
- (b) phosphite flow modifying stabilizer;
- (c) hydrotalcite flow modifying stabilizer;
- (d) organometallic stabilizer;
- and
- (e) lubricant,
- wherein the polyvinyl halide resin has a K value ranging from about 52 to about 60, and wherein the melt flow index of the compound is at least 20% higher than that of the compound without presence of the phosphite flow modifying stabilizer and the hydrotalcite flow modifying stabilizer as measured by ASTM 1238 using 21.6 kg.
4 more elements
Dependencies are inferred from the claim text.