Stabilizer Systems as UV Filters
Publication Date: 2002-Dec-20
The IP.com Prior Art Database
A stabilizer system is disclosed comprising (a) a specific UV absorber of the tris-aryl-triazine class (UVA) and (b) a further stabilizer selected from the UV absorbers of the 2-(2’-hydroxyphenyl)benzotriazole, 2-hydroxybenzophenone and/or 2-hydroxyphenyl triazine type. The system may further comprise as component (c) a sterically hindered amine and or a conventional additive which may be selected from plasticizers, lubricants, emulsifiers, pigments, rheology additives, catalysts, flow-control agents, optical brighteners, further light stabilizers, antioxidants, clarifiers such as substituted and unsubstituted bisbenzylidene sorbitols, flameproofing agents, anti-static agents, benzoxazinone UV absorbers, blowing agents and thiosynergists. The present stabilizer system is useful for protecting packed foodstuffs, beverages, pharmaceuticals, cosmetics, personal care products, shampoos and the like from the deleterious effects of ultraviolet radiation. The stabilizer systems disclosed is especially effective when incorporated in the containers or films in which such materials are stored.
Stabilizer Systems as UV Filters
The following stabilizer system comprising (a) a specific UV absorber of the tris-aryl-triazine class (UVA) and (b) a selected further stabilizer has proven valuable for applications wherein transmission of UV light should be blocked by an organic polymer substrate and a high compatibility of the stabilizer system with the substrate is required. Such combinations allow lower loading of organic UVA while maintaining the filtration requirements, and reduce compatibility issues of the organic UVA. Examples for the advantageous use of the stabilizer system include protection of plants by greenhouse films, and protection of packed foodstuffs, beverages, pharmaceuticals, cosmetics, personal care products, shampoos and the like from the deleterious effects of ultraviolet radiation. It has been found that certain highly compatible tris-aryl-s-triazines together with selected coadditives are especially effective towards this end when incorporated in the containers or films in which such materials are stored.
Polymer substrates are usually films or tapes based on polyolefin, polyolefin copolymers, polyester, polycarbonate, polyvinylalcohol, polyvinylacetate; most preferred are:
p1) polyethylenetherephthalate (PET);
polyolefins, in particular
p2) polyethylene (PE),
p3) low density polyethylene (LDPE),
p4) linear low density polyethylene (LLDPE),
The UVA component (a) of the present stabilizer system is of the formula (I), (Ib) or (II)
x is a number from 1 to 50;
A is a group of the formula (IIIb)
or has one of the meanings given for D, wherein formula (II) contains at least one A conforming to formula (IIIb);
D is a divalent residue containing 2 to 60 carbon atoms comprising an aliphatic, cycloaliphatic or aromatic hydrocarbon, or said aliphatic residue substituted by OH or interrupted by O or both substituted by OH and interrupted by O; and in case that D bonds to the carbon atom of L, D also comprises methylene or a direct bond;
L stands for an ester linkage group;
the R1 are independently of each other H, OR7 or OH, with the proviso that at least one of R1 or R13 is OH;
the R7 are independently of each other hydrogen, C1-C12alkyl or a radical of formula (III) (III), wherein in formula (I) at least one of the R7 is a radical of formula (III);
R8 is hydrogen, C1-C18alkyl; C5-C12cycloalkyl; C2-C18alkenyl; phenyl; C7-C11phenylalkyl; C7-C11alkylphenyl; C1-C18alkyl substituted by phenyl, OH, halogen;C1_C18alkoxy, C5-C12cycloalkoxy, C3-C18alkenyloxy or COOH;
Y is –CO- or C1-C12alkylene;
R9, if Y is –CO-, is C20-C60 alkyl,...