DETAILED DESCRIPTION What I claim as new and desire to secure by Letters Patent of the United States is: 1.
2,4-dihydroxy-4'-methoxy-3-methylbenzophenone.
2.
3-methyl-2,4,4'-trihydroxybenzophenone.
Description:
CROSS REFERENCE TO RELATED APPLICATIONS Reference is made to the copending application of James E.
Moore, for Melamine Coatings, Ser.
No.
935,590, filed Aug.
21, 1978 now U.
S.
Pat.
No.
4,197,392.
In addition, reference is also made to my copending application Ser.
No.
100,442, for UV Stabilizers, Coating Compositions and Composite Structures Obtained Therefrom, filed concurrently herewith and assigned to the same assignee as the present invention.
BACKGROUND OF THE INVENTION Prior to the present invention, 2,4-dihydroxybenzophenones such as Eastman 2,4-DHPB, manufactured by the Eastman Kodak Company, Rochester, New York, were used extensively as ultraviolet screens for the protection of various thermoplastics, such as polycarbonates, polyesters, etc.
In determining whether a particular UV stabilizer is effective, the stabilizer can be incorporated into an organic resin, for example, melamine at about a 3% by weight of the total coating composition and thereafter applied onto the surface of the thermoplastic substrate, for example, a sheet and cured.
Those skilled in the art, however, are constantly evaluating various UV stabilizers in order to optimize the protection afforded by such stabilizers to the thermoplastic substrates which are treated with such materials.
STATEMENT OF THE INVENTION The present invention is based on the discovery that UV stabilizers having the formula, ##STR1## where R is a C.
sub.
(1-8) alkyl radical, R.
sup.
1 is selected from the class consisting of hydrogen, and C.
sub.
(3-8) alkyl, R.
sup.
2 is selected from the class consisting of hydrogen, hydroxy, methyl and OR, and R.
sup.
3 is a member selected from the class consisting of hydrogen, hydroxy, R, OR, and C.
sub.
(1-8) hydroxy-alkoxy, and glycidyl alkoxy have been found to be superior UV stabilizers for a variety of thermoplastic substrates
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