Eastman-kodak Company

David M Pond

Richard H Wang

Gether Irick, Jr

Edward U Elam

William C Dickason

Robert D Burpitt

Mary E Dickerson

Thomas J Glenn

Process for the preparation of ethyl acetate by hydrogenating acetic anhydride in the presence of a Raney nickel catalyst. The process can also be utilized to hydrogenate mixtures of acetic anhydride and ethylidene diacetate to produce ethyl acetate.

Preparation of ethyl acetate

The invention relates to certain bichromophoric compounds which have been found to be effective ultraviolet stabilizers. The invention also relates to ultraviolet degradable organic compositions containing a stabilizing amount of a certain bichromophoric compound to prevent such degradation. These stabilizers are effective in the presence of other additives commonly employed in polymeric compositions including, for example, pigments, colorants, fillers, reinforcing agents and the like. These ultraviolet stabilizers may also be incorporated into the organic compositions such as polymers by adding to the polymer melt or dissolved in the polymer dope, coated on the exterior of the shaped or molded article, film or extruded fiber.

Benzotriazole ultraviolet stabilizers

The invention relates to bichromophoric heterocyclic ester compounds which have been found to be effective ultraviolet stabilizers. The invention also relates to ultraviolet degradable organic compositions containing a stabilizing amount of these bichromophoric heterocyclic ester compositions to prevent such degradation. These stabilizers are effective in the presence of other additives commonly employed in polymeric compositions including, for example, pigments, colorants, fillers, reinforcing agents and the like. These ultraviolet stabilizers may also be incorporated into the organic compositions in the polymer melt or dissolved in the polymer dope, coated on the exterior of the molded article, film or extruded fiber.

Bichromophoric benzoxazole ultraviolet stabilizers

This invention relates to benzotriazole ortho-ester compounds of the type (A).sub.x --C wherein A is a group having the structure ##STR1## and C is a group having the structure ##STR2## X IS AN INTEGER OF 1 TO 6 AND I is the same as R.sub.1, R.sub.2, R.sub.3 and R.sub.4 and is present on all positions of the benzenoid ring except the carbon atom attached to the heterocyclic ring and the carbon atom attached to the carbonyl group connecting the heterocyclic aromatic A group with the aromatic C group. R.sub.1, r.sub.2, r.sub.3 and R.sub.4 may be hydrogen, halogen or any of various alkyl, cycloalkyl, phenyl or other such substituents. In addition, pairs of R's, combined with the carbon atoms to which they are attached, may be joined alkylene groups completing a carbocyclic ring. These compounds are effective ultraviolet stabilizers and may be used in the presence of other additives commonly used in polymeric compositions including, for example, pigments, colorants, fillers, reenforcing agents and the like.

Benzotriazole ortho-ester compounds useful as ultraviolet stabilizers

Ultraviolet stabilizers and their use in organic compositions

The invention relates to polychromophoric heterocyclic ester compounds which have been found to be effective ultraviolet stabilizers. The invention also relates to ultraviolet degradable organic compositions containing a stabilizing amount of these polychromophoric heterocyclic ester compositions to prevent such degradation. These stabilizers are effective in the presence of other additives commonly employed in polymeric compositions including, for example, pigments, colorants, fillers, reinforcing agents and the like. These ultraviolet stabilizers may also be incorporated into the organic compositions in the polymer melt or dissolved in the polymer dope, coated on the exterior of the molded article, film or extruded fiber.

Polychromophoric heterocyclic ultraviolet stabilizers and their use in

The invention relates to benzotriazole ortho-ester compounds which have been found to be effective ultraviolet stabilizers. The invention also relates to ultraviolet degradable organic compositions containing a stabilizing amount of the benzotriazole ortho-ester composition to prevent such degradation. These stabilizers are effective in the presence of other additives commonly employed in polymeric compositions including, for example, pigments, colorants, fillers, reinforcing agents and the like. These ultraviolet stabilizers may also be incorporated into the organic compositions in the polymer melt or dissolved in the polymer dope, coated on the exterior of the molded article, film or extruded fiber.

Benzotriazole ortho-ester ultraviolet stabilizers

Polychromophoric heterocyclic ultraviolet stabilizers

The invention relates to certain benzoxazole bichromophoric compounds which have been found to be effective ultraviolet stabilizers. The invention also relates to ultraviolet degradable organic compositions containing a stabilizing amount of a certain benzoxazole bichromophoric compound to prevent such degradation. These stabilizers are effective in the presence of other additives commonly employed in polymeric compositions including, for example, pigments, colorants, fillers, reinforcing agents and the like. These ultraviolet stabilizers may also be incorporated into the organic compositions such as polymers by adding to the polymer melt or dissolved in the polymer dope, coated on the exterior of the shaped or molded article, film or extruded fiber.

Benzoxazole ultraviolet stabilizers and their use in organic compositions

This invention relates to a process involving the reaction of a quinone with a carbonyl compound in the presence of a basic catalyst to produce 2,3-dihydro-2,5-benzofurandiols. These compounds are useful intermediates in the synthesis of herbicides and plant growth regulants.

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Kingsport, TN, United States of America

David M Pond