Aluminosilicate stabilized halogenated polymers
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United States of America Patent
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Jul 2, 2002
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N/A
app pub date -
Jul 31, 2000
filing date -
Jul 29, 1999
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Abstract
The present invention describes halogenated polymer resins stabilized with one or more co-stabilizers, at least one co-stabilizer comprising a synthetic crystalline aluminosilicate of the formula M.sub.2/n O.Al.sub.2 O.sub.3.ySiO.sub.2.wH.sub.2 O, in which M is a charge balancing cation, n is the valence of M and is 1 or 2, y is the number of moles of SiO.sub.2 per mole of Al.sub.2 O.sub.3, and is 1.85 to 15 with a preferred range of about 2 to 5, and w is the moles of water of hydration per molecule of said aluminosilicate, wherein said aluminosilicate has a mean crystallite size in the range of about 0.01 .mu.m to about 1 .mu.m and a mean particle size in the range of about 0.1 to 10 .mu.m. Also described is a method for stabilizing halogenated polymers such as PVC and CPVC by incorporating said aluminosilicate into a formulation thereof. A zeolite process improvement for creating a dehydrated zeolite that does not substantially rehydrate is also described. The zeolite created by such process is ideal for use as a co-stabilizer of halogenated polymer resins.
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