Hydrolysis stabilizer for thermoplastic molding compositions
View Patent ↗A hydrolytic stabilizer mixture is disclosed. The mixture comprise i) at least one carbodiimide and ii) co-stabilizer selected from the group consisting of aluminum oxide and aluminum oxyhydroxide. The mixture is useful in imparting to polymeric systems improved resistance to hydrolysis.
1. A thermoplastic molding composition consisting of:
A) a polymeric system selected from the group consisting of: polyester, polyamide, polycarbonate and blends thereof;
B) optionally, a graft polymer;
C) a carbodiimide;
D) a stabilizer selected from the group consisting of aluminum oxide and aluminum oxyhydride; and
E) optionally, one or more components selected from the group consisting of: fillers, antistatic agents, lubricants and UV stabilizers, wherein the UV stabilizers are selected from the group consisting of: hydroxyl-benzophenones, hydroxybenzotriazoles, hydroxybenzotriazines, cyanoacrylates, oxanilides, benzoxazinones, nano-sized titanium oxide, nano-sized cerium oxide, and nano-sized zinc oxide.
2. The thermoplastic molding composition of claim 1 , wherein the graft polymer is present.
3. The thermoplastic molding composition of claim 2 , wherein the graft polymer consists of acrylonitrile butadiene styrene (ABS) and styrene acrylonitrile (SAN).
4. The thermoplastic molding composition of claim 1 , wherein the carbodiimide is:
where R 1 -R 14 independently one of the others denote a member selected from the group consisting of hydrogen, halogen, aliphatic, aromatic, cycloaliphatic and alkoxy radicals and n is 1 to 500.
5. The thermoplastic molding composition of claim 4 , wherein n is 1 to 100.
6. The thermoplastic molding composition of claim 5 , wherein n is 3 to 50.
7. The thermoplastic molding composition of claim 6 , wherein the carbodiimide is:
where n is 5 to 50.
8. The thermoplastic molding composition of claim 1 , wherein stabilizer D) is selected from the group of boehmite and pseudoboehmite.
9. The thermoplastic molding composition of claim 1 , wherein the particle size of component D) is 1 to 100 nm.
10. The thermoplastic molding composition of claim 1 , wherein the fillers of component E) are selected from the group consisting of: glass fibers, talc, clays, nanoclays, silica and nanosilica.
11. The thermoplastic molding composition of claim 1 , wherein the UV stabilizer is present.