Stabilizer composition for silyl-modified polymer sealants

A stabilizer composition comprising:

• (A) from 33 to 46% by weight, based on the total stabilizer composition, of an UV absorber as component A, wherein the UV absorber component A is the oxalanilide compound according to formula (I)-1
• (B) from 33 to 46% by weight, based on the total stabilizer composition, a hindered amine light stabilizer as component B, wherein the hindered light stabilizer component B is selected from 2-dodecyl-N-(2,2,6,6-tetramethyl-4-piperidinyl) succinimide, bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacat, bis(1,2,2,6,6-pentamethyl-4-piperidinyl)sebacat, bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl)sebacat, 2,2,4,4-tetramethyl-7-oxa-3,20-15 diazadispiro-20-(2,3-epoxi-propyl) dispiro-(5.1.11.2)-heneicosane-21-one, the reaction product of 2,2,4,4-tetramethyl-7-oxa-3,20-diazadispiro-20-(2,3-epoxi-propyl)dispiro-(5.1.11.2)-heneicosane-21-one and epichlorohydrin and mixtures thereof;
• (C) from 9 to 23% by weight, based on the total stabilizer composition, an antioxidant as component C, wherein the antioxidant component C is bis-(3,3-bis-(4′-hydroxy-3′-tert-butyl-phenyl)butanoic acid)-glycolester;
• (D) optionally at least one diluent as component D comprising solid inorganic powders selected from talc, mica, dolomite, kaolin, silica, calcium carbonate, magnesium carbonate, titanium oxide, iron oxide, zinc oxide, carbon black, or liquid diluents selected from solvents or liquid plasticizers;
• and
• (E) optionally at least one further additive as component E, selected from antistatic agents, flame proofing agents, softeners, nucleating agents, metal deactivators, biocides, impact modifiers, pigments, fungicides, and bactericides,
• wherein the stabilizer composition does not comprise pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), and
• wherein the UV absorber A and the antioxidant C are present in a weight-to-weight ratio A:C of from 5:1 to 1.5:1.