Liquid stabilizing mixtures for organic polymers
View Patent ↗Liquid stabilizing mixtures for organic polymers comprising: a) a liquid compound belonging to the group of sterically hindered phenols consisting of esters or mixtures of esters having formula (I); b) a solid compound belonging to the group of sterically hindered phenols having formula (II).
1. A liquid stabilizing mixture for organic polymers or copolymers comprising:
(a) a sterically hindered phenol having formula (I):
wherein:
R 1 and R 2 are both t-butyl;
R 3 is a linear C 14 -C 16 alkyl group,
(b) a sterically hindered phenol having formula (II):
wherein n is an integer ranging from 0 to 10, and the mixture is liquid both at room temperature and temperatures as low as -30°C.
2. A process for the preparation of the liquid stabilizing mixture of claim 1 which comprises:
(a′) heating a liquid compound of the sterically hindered phenol (a) to a temperature ranging from 60°C to 180°C, under stirring;
(b′) adding a solid compound selected from the group consisting of the sterically hindered phenol (b), maintaining the temperature within the range of 60°C to 180°C, and maintaining the whole mixture under stirring until the complete dissolution of said compound (b), for a time ranging from 5 minutes to 100 minutes to obtain a liquid stabilizing mixture.
3. The process according to claim 2 , wherein the weight ratios between the liquid compound (a) and the solid compound (b) range from 90: 10 to 30:70.
4. The process according to claim 2 , wherein the weight ratios between the liquid compound (a) and the solid compound (b) range from 60:40 to 70:30.
5. A liquid stabilizing mixture for organic polymers or copolymers comprising:
(a) a sterically hindered phenol having formula (I):
wherein:
R 1 and R 2 are both t-butyl;
R 3 is a linear C 14 -C 16 alkyl group,
(b) a sterically hindered phenol having formula (II):
wherein n is an integer ranging from 0 to 10, and the mixture is permanently liquid both at room temperature and temperatures as low as -30°C.
6. A liquid stabilizing mixture for organic polymers or copolymers comprising:
(a) a first sterically hindered phenol having formula (I):
wherein:
R 1 and R 2 are both t-butyl;
R 3 is a linear C 14 -C 16 alkyl group,
(b) a second sterically hindered phenol comprising the reaction product of p-cresol and dicyclopentadiene, alkylated with isobutylene;
wherein the mixture is liquid both at room temperature and temperatures as low as -30°C.
7. The mixture according to claim 6 , wherein the second sterically hindered phenol comprises the formula (II):
wherein n is an integer ranging from 0 to 10.
8. A liquid stabilizing mixture for organic polymers or copolymers comprising:
(a) a first sterically hindered phenol having formula (I):
wherein:
R 1 and R 2 are both t-butyl;
R 3 is a linear C 14 -C 16 alkyl group,
(b) a second sterically hindered phenol comprising the reaction product of p-cresol and dicyclopentadiene, alkylated with isobutylene;
wherein the mixture is permanently liquid both at room temperature and temperatures as low as -30°C.