Other

Ppg Industries, Inc.

The United States of America As Represented by the Administrator of the

Otto Vogl

Mark M Green

Chongli Zhang

Eberhard Borsig

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.

Thermally reversible gels in liquid media

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.

2(2-hydroxyphenyl)2H-benzotriazole compounds and homopolymers or

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.

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New Rochelle, NY, United States of America

Otto Vogl