Synergistic stabilizer compositions and methods for using same for protecting organic materials from uv light and thermal degradation

A stabilizer composition comprising:

• i) a stabilizing amount of an ultraviolet light absorber (UVA) selected from the group consisting of orthohydroxyphenyl triazine compounds, orthohydroxybenzophenone compounds, oxanilides, cyanoacrylates, benzoxazinone compounds, and mixtures thereof;
• ii) a stabilizing amount of a hindered amine light stabilizer compound (HALS) comprising a functional group according to Formula (II):
• wherein R31 is chosen from:
• hydrogen;
• OH;
• C1-C20 hydrocarbyl;
• —CH2CN;
• C1-C12 acyl;
• or C1-C18 alkoxy;
• R38 is chosen from:
• hydrogen;
• or C1-C5 hydrocarbyl;
• and each of R29, R30, R32, and R33 is independently chosen from C1-C20 hydrocarbyl, or R29 and R30 and/or R32 and R33 taken together with the carbon to which they are attached form a C5-C10 cycloalkyl;
• or
• a functional group according to Formula (IIa):
• wherein
• m is an integer from 1 to 2;
• R39 is chosen from:
• hydrogen;
• OH;
• C1-C20 hydrocarbyl;
• —CH2CN;
• C1-C12 acyl;
• or C1-C18 alkoxy;
• and
• each of G1-G4 is independently chosen from C1-C20 hydrocarbyl;
• or
• mixtures of HALS compounds having functional groups according to Formula (II) and Formula (IIa);
• iii) a stabilizing amount of a co-synergist selected from the group consisting of bisamides of fatty acids of the general formula (IV):
• wherein Ra is a C7 to C25 alkyl group with 0 to 6 unsaturated double bonds and n is 2 to 10;
• and
• iv) a stabilizing amount of a co-active agent selected from the group consisting of alkoxylated C12-C60 alcohols or monoalkyl ethers thereof;
• alkoxylated esters of fatty acids;
• sorbitan esters or ethoxylates thereof;
• mono- or polyglycerol esters having from 1 to 20 glycerol units or alkoxylates thereof;
• alkoxylated fatty amines, esters thereof, or salts thereof;
• sugar esters;
• alkoxylated fatty amides;
• ethylene oxide/propylene oxide copolymers;
• and mixtures thereof;
• wherein the total weight of co-synergist (IV) and co-active agent is from 1 wt. % to 99 wt. %, based on the total weight of the stabilizer composition;
• and the weight ratio of co-synergist to co-active agent is 1:99 to 99:1,
• or comprising:
• i) a stabilizing amount of an ultraviolet light absorber (UVA) selected from the group consisting of orthohydroxyphenyl triazine compounds;
• orthohydroxybenzophenone compounds;
• orthohydroxyphenyl benzotriazole compounds;
• oxanilides;
• cyanoacrylates;
• benzoxazinone compounds;
• and mixtures thereof;
• ii) a stabilizing amount of a hindered amine light stabilizer compound (HALS) comprising a functional group according to Formula (II):
• wherein R31 is chosen from:
• hydrogen;
• OR C1-C20 hydrocarbyl;
• —CH2CN;
• C1-C12 acyl;
• or C1-C18 alkoxy;
• R38 is chosen from:
• hydrogen;
• or C1-C8 hydrocarbyl;
• and each of R29, R30, R32, and R33 is independently chosen from C1-C20 hydrocarbyl, or R29 and R30 and/or R32 and R33 taken together with the carbon to which they are attached form a C5-C10 cycloalkyl;
• or
• a functional group according to Formula (IIa):
• wherein
• m is an integer from 1 to 2;
• R39 is chosen from:
• hydrogen;
• OR C1-C20 hydrocarbyl;
• —CH2CN;
• C1-C12 acyl;
• or C1-C18 alkoxy;
• and
• each of G1-G4 is independently chosen from C1-C20 hydrocarbyl;
• or
• mixtures of HALS compounds having functional groups according to Formula (II) and Formula (IIa);
• iii) a stabilizing amount of a co-synergist selected from the group consisting of bisamides of fatty acids of the general formula (IV):
• wherein Ra is a C7 to C25 alkyl group with 0 to 6 unsaturated double bonds and n is 2 to 10;
• and
• wherein the co-synergist (IV) is present at from 1 wt. % to 99 wt. %, based on the total weight of the stabilizer composition;
• and
• wherein a co-active agent selected from the group consisting of alkoxylated C12-C60 alcohols or monoalkyl ethers thereof;
• alkoxylated esters of fatty acids;
• sorbitan esters or ethoxylates thereof;
• mono- or polyglycerol esters having from 1 to 20 glycerol units or alkoxylates thereof;
• alkoxylated fatty amines, esters thereof, or salts thereof;
• sugar esters;
• alkoxylated fatty amides;
• ethylene oxide/propylene oxide copolymers;
• and mixtures thereof, is absent from the stabilizer composition (0 wt. %).