C - Chemistry – Metallurgy – 07 – F
Patent
C - Chemistry, Metallurgy
07
F
C07F 9/48 (2006.01) C07F 9/145 (2006.01) C07F 9/547 (2006.01) C08K 5/17 (2006.01) C08K 5/3435 (2006.01) C08K 5/3462 (2006.01) C08K 5/524 (2006.01) C08K 5/5393 (2006.01)
Patent
CA 2107526
Abstract of the disclosure: Process for stabilizing trivalent phosphorus compounds with amines The invention relates to a process for stabilizing a crystalline organic phosphite or phosphonite against hydrolysis, which comprises introducing a mixture comprisingphosphite or phosphonite, a solvent or solvent mixture, and 0.1 to 100% by weight (relative to phosphite or phosphonite) of an amine and having a temperature of 50-100°C as a homogeneous melt into a liquid crystallization medium whose temperature during the addition is maintained 10-70°C below the temperature of the melt. The phosphites or phosphonites stabilized according to the invention are distinguished by their excellent resistance to hydrolysis and have a long shelf life even at high atmospheric humidity. They can be advantageously used as stabilizers for organic material against the damaging effect of heat, oxygen, and/or light.
Linhart Helmut
Quotschalla Udo
Ciba Specialty Chemicals Holding Inc.
Fetherstonhaugh & Co.
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