Stabilized styrene-acrylonitrile polymer compositions

Abstract

Abstract THERE ARE DISCLOSED HIGH MOLECULAR WEIGHT STYRENEACRYLONITRILE POLYMER COMPOSITIONS EXHIBITING A HIGH DEGREE OF STABILITY CONTAINING AN EFFECTIVE CONCENTRATION OF A STABILIZER MIXTURE COMPRISING: (A) A C2-C8 ALKYL STANNOIC OR C2-C8 ALKYL THIOSTANNOIC ACID AND (B) A COMPOUND HAVING THE FORMULA: (R-CO-S)N-X WHEREIN R IS A HYDROCARBYL GROUP CONTAINING FROM 3 TO ABOUT 21 CARBON ATOMS, N IS AN INTERGER HAVING A VALUE OF FROM 1 TO 2, X IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, ALKALI METAL, ALKALINE EARTH METALS AND ACYL MOIETIES HAVING A HYDROCARBYL ESSENTIALLY HYDROCARBON RESIDUE AND CONTAINING FROM ABOUT 1 TO ABOUT 17 CARBON ATOMS INCLUSIVE. THIS COMBINATION OF STABILIZERS HAS PROVEN TO BE PARTICULARLY EFFECTIVE IN ACRYLONITRILEBUTADIENE-STYRENE COPOLYMER COMPOSITIONS. INCLUDED AMONG THE PREFERRED STABILIZERS OF GROUP (A) ARE: ETHYL STANNOIC ACID; N-BUTYL STANNOIC ACID; N-BUTYL THIOSTANNOIC ACID; AND, N-OCTYL STANNOIC ACID WHILE THE PREFERRED STABILIZERS OF GROUP (B) INCLUDE THIOLLAURIC ANHYDRIDE; THIOLLAURIC ACID; THIOLOLEIC ANHYDRIDE; THIOLBENZOIC ANHYDRIDE AND THIOLSTEARIC ANHYDRIDE. THIS STABILIZING SYSTEM IS ONE OF THE FEW PROPOSED FOR STYRENE-ACRYLONITRILE TYPE RESINS WHICH IS NOT BASED ON A HINDERED PHENOL.

Inventors

• 👤 Walter Stamm

Bibliographic Details