US 6,166,218 A · Benzotriazole UV absorbers having enhanced durability

Abstract

Benzotriazole UV absorbers which are substituted at the 5-position of the benzo ring by an electron withdrawing group exhibit enhanced durability and very low loss rates when incorporated into automotive coatings. This is particularly the case when the 3-position of the phenyl ring is also substituted by phenyl or phenylalkyl such as .alpha.-cumyl. Compounds where the 5-position of the benzo ring are substituted by perfluoroalkyl such as trifluoromethyl are particularly of interest for both their enhanced durability and for their excellent solubility and excellent color properties in some thermoplastic compositions when the phenyl ring is substituted at the 3-position by hydrogen or tert-alkyl.

A compound of formula I, III or IV ##STR13## wherein G.sub.1 is hydrogen or chloro,

G.sub.2 is cyano, perfluoroalkyl of 1 to 12 carbon atoms or fluoro,
G.sub.6 is perfluoroalkyl of 1 to 12 carbon atoms,
G.sub.7 is hydrogen or perfluoroalkyl of 1 to 12 carbon atoms,
E.sub.1 is hydrogen, straight or branched chain alkyl of 1 to 24 carbon atoms, straight or branched chain alkenyl of 2 to 24 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, phenylalkyl of 7 to 15 carbon atoms, phenyl, or said phenyl or said phenylalkyl substituted on the phenyl ring by 1 to 4 alkyl of 1 to 4 carbon atoms;
or E.sub.1 is alkyl of 1 to 24 carbon atoms substituted by one or two hydroxy groups,
E.sub.2 and E.sub.2 ' are independently straight or branched alkyl chain of 1 to 24 carbon atoms, straight or branched chain alkenyl of 2 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, phenylalkyl of 7 to 15 carbon atoms, phenyl, or said phenyl or said phenylalkyl substituted on the phenyl ring by one to three alkyl of 1 to 4 carbon atoms;
or E.sub.2 and E.sub.2 ' are independently said alkyl of 1 to 24 carbon atoms or said alkenyl of 2 to 18 carbon atoms substituted by one or more --OH, --OCOE.sub.11, --OE.sub.4, --NCO, --NH.sub.2, --NHCOE.sub.11, --NHE.sub.4 or --N(E.sub.4).sub.2, or mixtures thereof, where E.sub.4 is straight or branched chain alkyl of 1 to 24 carbon atoms;
or said alkyl or said alkenyl interrupted by one or more --O--, --NH-- or --NE.sub.4 -- groups or mixtures thereof and which can be unsubstituted or substituted by one or more --OH, --OE.sub.4 or --NH.sub.2 groups or mixtures thereof;
n is 1 or 2,
when n is 1, E.sub.5 is OE.sub.6 or NE.sub.7 E.sub.8, or
E.sub.5 is --PO(OE.sub.12).sub.2, --OSi(E.sub.11).sub.3 or --OCO--E.sub.11, or straight or branched chain C.sub.1 -C.sub.24 alkyl which is interrupted by --O--, --S-- or --NE.sub.11 and which can be unsubstituted or substituted by --OH or --OCO--E.sub.11, C.sub.5 -C.sub.12 cycloalkyl which is unsubstituted or substituted by --OH, straight chain or branched C.sub.2 -C.sub.18 alkenyl which is unsubstituted or substituted by --OH, C.sub.7 -C.sub.15 aralkyl, --CH.sub.2 --CHOH--E.sub.13 or glycidyl,
E.sub.6 is hydrogen, straight or branched chain C.sub.1 -C.sub.24 alkyl which is unsubstituted or substituted by one or more OH, OE.sub.4 or NH.sub.2 groups, or --OE.sub.6 is --(OCH.sub.2 CH.sub.2).sub.w OH or --(OCH.sub.2 CH.sub.2).sub.w OE.sub.21 where w is 1 to 12 and E.sub.21 is alkyl of 1 to 12 carbon atoms,
E.sub.7 and E.sub.8 are independently hydrogen, alkyl of 1 to 18 carbon atoms, straight or branched chain C.sub.3 -C.sub.18 alkyl which is interrupted by --O--, --S-- or --NE.sub.11 --, C.sub.5 -C.sub.12 cycloaLkyl, C.sub.6 -C.sub.14 aryl or C.sub.1 -C.sub.3 hydroxylalkyl, or E.sub.7 and E.sub.8 together with the N atom are a pyrrolidine, piperidine, piperazine or morpholine ring,
E.sub.5 is --X--(Z).sub.p --Y--E.sub.15
wherein
X is --O-- or --N(E.sub.16)--,
Y is --O-- or --N(E.sub.17)--,
Z is C.sub.2 -C.sub.12 -alkylene, C.sub.4 -C.sub.12 -alkylene interrupted by one to three nitrogen atoms, oxygen atoms or a mixture thereof, or is C.sub.3 -C.sub.12 -alkylene, butenylene, butynylene, cyclohexylene or phenylene, each substituted by a hydroxyl group,
m is zero, 1 or 2,
p is 1, or p is also zero when X and Y are --N(E.sub.16)-- and --N(E.sub.17)--, respectively,
E.sub.15 is a group --CO--C(E.sub.18).dbd.C(H)E.sub.19 or, when Y is --N(E.sub.17)--, forms together with E.sub.17 a group --CO--CH.dbd.CH--CO--, wherein E.sub.18 is hydrogen or methyl, and E.sub.19 is hydrogen, methyl or --CO--X--E.sub.20, wherein E.sub.20 is hydrogen, C.sub.1 -C.sub.12 -alkyl or a group of the formula ##STR14## wherein the symbols E.sub.1, G.sub.2, X, Z, m and p have the meanings defined above, and E.sub.16 and E.sub.17 independently of one another are hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.3 -C.sub.12 -alkyl interrupted by 1 to 3 oxygen atoms, or is cyclohexyl or C.sub.7 -C.sub.15 aralkyl, and E.sub.16 together with E.sub.17 in the case where Z is ethylene, also forms ethylene,
when n is 2, E.sub.5 is one of divalent radicals --O--E.sub.9 --O-- or --N(E.sub.11)--E.sub.10 --N(E.sub.11)--,
E.sub.9 is C.sub.2 -C.sub.8 alkylene, C.sub.4 -C.sub.8 alkenylene, C.sub.4 alkynylene, cyclohexylene, straight or branched chain C.sub.4 -C.sub.10 alkylene which is interrupted by --O-- or by --CH.sub.2 --CHOH--CH.sub.2 --O--E.sub.14 --O--CH.sub.2 --CHOH--CH.sub.2 --,
E.sub.10 being straight or branched chain C.sub.2 -C.sub.12 alkylene which may be interrupted by --O--, cyclohexylene, or ##STR15## or E.sub.10 and E.sub.11 with the two nitrogen atoms form a piperazine ring,
E.sub.14 is straight or branched chain C.sub.2 -C.sub.8 alkylene, straight or branched chain C.sub.4 -C.sub.10 alkylene which is interrupted by --O--, cycloalkylene, arylene or ##STR16## where E.sub.7 and E.sub.8 are independently hydrogen, alkyl of 1 to 18 carbon atoms or E.sub.7 and E.sub.8 together are alkylene of 4 to 6 carbon atoms, 3-oxapentamethylene, 3-iminopentamethylene or 3-methyliminopentamethylene,
E.sub.11 is hydrogen, straight or branched chain C.sub.1 -C.sub.18 alkyl, C.sub.5 -C.sub.12 cycloalkyl, straight or branched chain C.sub.2 -C.sub.18 alkenyl, C.sub.6 -C.sub.14 aryl or C.sub.7 -C.sub.15 aralkyl,
E.sub.12 is straight or branched chain C.sub.1 -C.sub.18 alkyl, straight or branched chain C.sub.3 -C.sub.18 alkenyl, C.sub.5 -C.sub.10 cycloalkyl, C.sub.6 -C.sub.16 aryl or C.sub.7 -C.sub.15 aralkyl,
E.sub.13 is H, straight chain or branched C.sub.1 -C.sub.18 alkyl which is substituted by --PO(OE.sub.12).sub.2, phenyl which is unsubstituted or substituted by OH, C.sub.7 -C.sub.15 aralkyl or --CH.sub.2 OE.sub.12,
L is alkylene of 1 to 12 carbon atoms, alkylidene of 2 to 12 carbon atoms, benzylidene, p-xylylene, .alpha.,.alpha.,.alpha.',.alpha.'-tetramethyl-m-xylylene or cycloalkylidene, and
with the proviso that when G.sub.2 is CF.sub.3 and E.sub.1 is hydrogen, E.sub.2 is not methyl.

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Benzotriazole UV absorbers having enhanced durability

Life of this patent

Benzotriazole UV absorbers having enhanced durability

Life of this patent

Abstract

Claims8