Eastman-kodak Company

Eastman Chemical Company

Polygen Holding Corporation

Charles H Foster

John C Hubbs

Cyril Y Bowers

Wayne Livingston Cody

Frank A Momany

Thauming Kuo

J Stewart Witzeman

Philip Conrad Heidt

Ching H Chang

Allen Lynn Crain

Charles A McCombs

Donald R Nelan

Dean C Webster

David L Murray

Charles T Goodhue

Bradley James Helmer

Yeong-Ho Chang

Gwendolyn C Kydd

Chih-Herng J Su, Deceased

The latex polymer compositions of the present invention exhibit latent crosslinking properties. Latent crosslinking in the polymers takes advantage of the fast reaction that occurs between amine-reactive carbonyl groups in the polymer component and carbonyl-reactive amine nitrogens in the crosslinking component, but controls the rate of crosslinking by protonating the amines with a volatile acid. Once the latex is coated onto a substrate, the volatile acid evaporates and the carbonyl reactive amine nitrogens react with the amine reactive carbonyl groups to form a crosslinked coating.

Protonated amines for controlled crosslinking of latex polymers

Provided are various 2-acetylglutarate esters of polyols which are useful as poller crosslinkers for use in thermosetting coating compositions, as well as methods of preparation of these materials. In particular, the invention provides crosslinkers of the formula ##STR1## wherein R and R' are independently t-butyl, t-amyl, or phenyl, and x is an integer of from 2 to 5.

Crosslinkers based on 2-acetylglutarate esters of polyols

Provided are curable copolymers having 1,3-dioxolan-2-one-4-yl groups incorporated therein. The copolymers are useful as binders in coating compositions and can be cured with primary amine cross-linking compounds to form a continuous polyurethane coating.

Copolymers containing 1,3-dioxolane-2-one-4-yl groups and coatings made

Disclosed are novel polypeptide compounds which promote the release and elevation of growth hormone levels in the blood of animals. Also disclosed are methods of promoting the release and elevation of growth hormone levels in the blood of animals using the disclosed polypeptide compounds.

Polypeptide compounds having growth hormone releasing activity

Novel polypeptides which promote the release of growth hormone when administered to animals are described. These polypeptides have the formula:

Provided are 3-oxoadipate esters of certain polyols which are useful as crosslinkers in thermosetting coating compositions. Also provided are such thermosetting compositions comprised of a curable hydroxyl-functional polymer such as a polyester or acrylic and the crosslinkers of the present invention. Such compositions offer a significant improvement in curing temperature.

Thermosetting coating compositions

Provided are polyester resins containing hydroxy functionalized isophthalate ester moieties useful in coating compositions. The invention provides both solvent-borne as well as water-borne coating compositions comprised of the resins and a crosslinker such as a melamine-type crosslinker. Polyester resins of the present invention having a T.sub.g of greater than about 50.degree. C. are useful in thermosetting powder coating compositions. The coatings thus provided possess excellent acid resistance, hardness, impact resistance, and stain resistance.

Provided are polyester resins containing hydroxy functionalized isophthalate ester moieties useful in coating compositions. The invention provides both solvent-borne as well as water-borne coating compositions comprised of the resins and a crosslinker such as a melamine-type crosslinker. Polyester resins of the present invention having a T.sub.8 of greater than about 50.degree. C. are useful in thermosetting powder coating compositions. The coatings thus provided possess excellent acid resistance, hardness, impact resistance, and stain resistance.

Disclosed is a process for preparation of an amino acid, such as phenylalanine, with a high degree of optical purity. The process makes use of the same amino acid as a chiral template.

Trisubstituted piperazin-2,5-diones

Process for preparation of amino acids

Disclosed are combinations of polypeptides acting in a synergistic manner to promote release and elevation of growth hormone levels in the blood of animals. Also disclosed are methods of promoting the release and elevation of growth hormone levels in the blood of animals using the disclosed combination of polypeptides.

Combinations having synergistic growth hormone releasing activity and

A process for separating the .alpha.-tocopherol homologues from the other ester members of a tocopherol homologue mixture. The isolation of the .alpha.-tocopherol homologue is accomplished by selective deacylation of a mixture of tocopheryl esters in the presence of a base catalyst followed by separation of the .alpha.-ester from the other free tocopherols.

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Kingsport, TN, United States of America

Charles H Foster