LIQUID STABILIZER MIXTURES

The present invention relates to two processes for providing stable liquid blends of a) pentaerythritol tetrakis(3 (3 5 di tert butyl 4 hydroxyphenyl)propionate b) octadecyl 3 (3 5 di tert butyl 4 hydroxyphenyl)propionate and c) tris (2 4 di tert butylphenyl)phosphite. The first process comprises preparing a solid mixture comprising about 2 parts to about 3 parts by weight a) about 2 parts to about 3 parts by weight b) and about 2 parts to about 12 parts by weight c) heating the mixture to 185°C or higher for a sufficient time to obtain a clear liquid blend of a) b) and c) cooling the liquid blend to a temperature of from 90°C to 140°C and maintaining the liquid blend at a temperature of from 90°C to 140°C. The second process comprises preparing a solid mixture comprising about 2 parts to about 3 parts by weight a) and about 2 parts to about 3 parts by weight b) heating the mixture to 90°C or higher for a sufficient time to obtain a clear liquid mixture of a) and b) adding about 2 parts to about 12 parts by weight c) thereto to obtain a clear liquid blend of a) b) and c) and maintaining the liquid blend at a temperature of from 90°C to 140°C. The liquid blends of a) b) and c) are stable at the temperature at which they are maintained for greater than 120 hours.