Aluminosilicate stabilized halogenated polymers
US6414071B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2000 |
| Grant date | Jul 2, 2002 |
| Priority date | — |
| Expiry date | Jul 31, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K3/34
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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 M2/nO.Al2O3.ySiO2.wH2O, 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 SiO2 per mole of Al2O3, 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 &mgr;m to about 1 &mgr;m and a mean particle size in the range of about 0.1 to 10 &mgr;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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.