Rigid PVC compounding compositions exhibiting weather resistance and PVC degradation resistance in hot sunny climates
AssigneePolyOne Corporation
InventorsRoman Bohdan Hawrylko, Peter Wolfgang Krause, Michel Levesque
Life of this patent
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Abstract
Rigid PVC resins are compounded with a chalk-like Caribbean micritic calcium carbonate to provide improved weathering resistance of rigid PVC articles subjected to external exposures of heat and sunlight. The effective resistance to heat and sunlight is substantially increased by rigid PVC resins compounded with European chalk and Caribbean micritic calcium carbonate, zinc dialkyl ester scavenger and organotin stabilizer to provide considerably increased PVC degradation resistance.
Claims48
A weather resistant polyvinyl chloride (PVC) resin compounding composition, comprising:
- a rigid PVC resin;
- and
- at least about 2 weight parts of non-precipitated, sedimentary Caribbean calcium carbonate per 100 weight parts of PVC resin, the calcium carbonate having a particle size less than about 10 microns and is about 98% or more by weight pure calcium carbonate essentially free of iron.
A weather resistant polyvinyl chloride (PVC) compounding composition, comprising:
- a rigid PVC resin;
- at least about 2 weight parts of a non-precipitated, finely divided, chalk calcium carbonate having a particle size less than about 10 microns and at least about 98% pure calcium carbonate essentially free of iron;
- at least about 0.5 weight parts of an alkyl substituted organotin having one, two, or three non-alkyl substituted active mercapto or carboxylate groups;
- at least about 0.1 weight parts of zinc dialkyl ester scavenger, where the equivalents of zinc alkyl groups is less than the equivalents of non-alkyl active mercapto or carboxyl groups of the organotin;
- and
- where all weight parts are based on 100 weight parts of PVC resin.
A process for producing a rigid polyvinyl chloride (PVC) resin compounding composition, the process comprising:
- providing a non-precipitated, sedimentary Caribbean micritic calcium carbonate having a particle size less than about 10 microns, at least about 98% pure calcium carbonate, and essentially free of iron;
- and
- mixing the calcium carbonate with PVC resin to form a PVC compounding composition containing at least about 2 weight parts calcium carbonate per 100 weight parts of PVC resin.
Dependencies are inferred from the claim text.