Abstract: 2,6-dimethylphenylmaleimide is used as a comonomer for the preparation of styrene copolymers and vinyl chloride copolymers having an increased glass transition temperature and low intrinsic coloration compared with the prior art.

Abstract: Thermally reversible gels comprising liquid solvents wherein the solvent is converted into a thermally reversible gel upon the addition of a rigid polymer, preferably, a liquid crystal forming polymer. Structural modifications of the rigid polymer, and in particular modifications of the side-chain, adapt the rigid polymer to form thermally reversible gels in any given solvent media.

Abstract: Polymerizable ethylenically unsaturated monomers comprising the reaction product of a 1,2-epoxy group-containing polymerizable ethylenically unsaturated monomer and a 2(2-hydroxyphenyl)2H-benzotriazole compound of the structure: ##STR1## where X is=to H, OR and NR.sub.2 where R=alkyl; Z'=H and C.sub.2 H.sub.4 OH; Z and Y=H when Z'=C.sub.2 H.sub.4 OH; when Z'=H, Y and Z=OH or Y=H and Z.times.OH are disclosed. The monomers are useful in preparing free radical initiated addition polymers. Polymers can also be prepared by first preparing a free radical initiated addition polymer derived from a 1,2-epoxy group-containing polymerizable ethylenically unsaturated monomer and subsequently reacting the polymer with the benzotriazole compound. Both types of polymer contain permanent polymer-bound ultraviolet light stabilizers and are useful as binders for exterior coatings, as resins for the manufacture of optical lenses, and as components for sunscreens and suntanning lotions.

Abstract: The compound 2(2-hydroxy-5-isopropenylphenyl)2H-benzotriazole (2H5P) is produced by azo coupling of o-nitrophenyl diazonium chloride with p-hydroxyacetophenone, subjecting the resulting isolated azo compound to reductive cyclization with zinc in the presence of sodium hydroxide at a temperature of about 50.degree.-70.degree. C., acidifying the resulting mixture so as to produce (2(2-hydroxy-5-acetylphenyl)2H-benzotriazole (2H5A), acetylating the isolated 2(2-hydroxy-5-acetylphenyl)2H-benzotriazole (2H5A), so as to produce 2(2-acetoxy-5-acetylphenyl)2H-benzotriazole (2A5A), methylating the isolated 2(2-acetoxy-5-acetylphenyl(2H-benzotriazole (2A5A) with a methyl Grignard reagent and dehydrating the isolated reaction product with potassium hydrogen sulfate so as to produce 2(2-hydroxy-5-isopropenylphenyl)2H-benzotriazole (2H5P). The compound is used as a polymerizable ultra violet light stabilizer.

Abstract: Ultraviolet light absorbing compounds having two different chromophors in the same molecule, particularly the benzotriazole chromophor and either the dihydroxybenzophenone or dihydroxyacetophenone chromophor; specifically, the two compounds 3,5-[di(2H-benzotriazole-2-yl)]-2,4-dihydroxyacetophenone and 3,5-[di(2H-benzotriazole-2-yl)]2,4-dihydroxybenzophenone.

Abstract: An unsaturated polyester, such as propylene glycol-maleic acid-phthalic acid prepolymer dissolved in styrene is interpolymerized with an ultraviolet absorber of the formula: ##STR1## and/or an antioxidant of the formula ##STR2## where R and R.sup.2 are selected from H or lower alkyl such as methyl and R.sup.1 is tertiary alkyl such as tertiary butyl to form a polymer stable to exposure to the outdoors without degradation by ultraviolet radiation, thermal and/or photooxidation.

Abstract: Benzotriazole compounds having the formula ##STR1## wherein A represents a hydrogen atom or an acetyl group; R.sup.1 represents vinyl, ethyl or a haloethyl group; R.sup.2 represents a C.sub.1-4 alkyl group and n is 1 or 2. The R.sub.2.sup.2 groups need not be identical and a homopolymer or copolymers thereof which are effective as an ultraviolet absorber.

Abstract: A benzotriazole compound of the formula: ##STR1## wherein A is hydrogen or acetyl; R.sup.2 is a C.sub.1 -C.sub.4 alkyl group and n is 1 or 2.