Defensive publication

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  • Publication Date: November 23, 1971
  • Publication Number: US-T892006-I4

Abstract

THERE ARE DISCLOSED LIGHT-SENSITIVE POLYESTER CONDENSATION PRODUCTS OF THE BIS(P-CARBOXYBENZYLIDENE)CYCLOALKANONES, OR THEIR ESTERS WITH ORGANIC DIOLS CONTAINING RECURRING GROUPS HAVING THE FORMULA WHEREIN R1 AND R2 ARE HYDROGEN ATOMS, OR TOGETHER REPRESENT THE ATOMS NECESSARY TO COMPLETE A CYCLOALKANONE RING HAVING 5 TO 8 CARBON ATOMS IN THE RING AND G IS THE RESIDUE REMAINING AFTER REMOVAL OF THE HYDROXYL GROUPS FROM AN ORGANIC DIOL. THESE POLYESTERS ARE OBTAINED BY REACTING A DIOL WITH A DIBENZYLIDENEALKANONE MONOMER HAVING THE FORMULA WHEREIN R1 AND R2 ARE AS DEFINED ABOVE AND R3: A HYDROGEN ATOM, A LOWER ALKYL GROUP OR AN ARYL GROUP. AN EXAMPLE OF SUCH A MONOMER DISCLOSED IS 2,5-DI(4-CARBOMETHOXYBENZYLIDENE)CYCLOPENTANONE HAVING THE FORMULA D R A W I N G THIS MONOMER IS OBTAINED BY THE REACTION OF METHYL 4FORMYLBENZOATE AND CYCLOPENTANONE. THERE IS DISCLOSED THE PREPARATION OF A LIGHT-SENSITIVE POLYESTER BY THE REACTION OF DIMETHYLISOPHATHALATE AND 2,5-DI(4-CARBOMETHOXYBENZYLIDENE)CYCLOPENTANONE WITH 1,4-(B-HYDROXYETHOXY)CYCLOHEXANE. THE LIGHT-SENSITIVE POLYESTERS ARE USEFUL IN PHOTO-MECHANICAL REPRODUCTION PROCESSES SUCH AS FOR LITHOGRAPHIC PURPOSE OR A PHOTO-RESISTS.

Claims

EFENSWE PUBMQA'HQN UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 O.G. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet. Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Ofiice makes no assertion as to the novelty of the disclosed subject matter. PUBLISHED NOVEMBER e3, 1971 T892,006 PHOTOSENSITHVE PQLYMEIRS Thomas M. Laakso and Jack L. R. Williams, both of Kodak Park, Rochester, N.Y. 14650 Filed Sept. 29, 1970, Ser. No. 76,597 Int. Cl. Gillie 1/68 US. Cl. 96115 No Drawing. 12 Pages Specification There are disclosed light-sensitive polyester condensation products of the bis(p-carboxybenzylidene)cycloalkanones, or their esters with organic diols containing recurring groups having the formula wherein R and R are hydrogen atoms, or together represent the atoms necessary to complete a cycloalkanone ring having 5 to 8 carbon atoms in the ring and G is the residue remaining after removal of the hydroxyl groups from an organic diol. These polyesters are obtained by reacting a diol with a dibenzylidcnealkanone monomer having the formula wherein R and R are as defined above and R is a hydrogen atom, a lower alkyl group or an aryl group. An example of such a monomer disclosed is 2,5-di(4-carbomethoxybenzylidene)cyclopentanone having the formula This monomer is obtained by the reaction of methyl 4- formylbenzoate and cyclopentanone. There is disclosed the preparation of a light-sensitive polyester by the reaction of dimethylisophathalate and 2,5-di(4-carbomethoxybenzylidene)cyclopentanone with 1,4-(fl-hydroxyethoxy)cyclohexane. The light-sensitive polyesters are useful in photo-mechanical reproduction processes such as for lithographic purposes or as photo-resists.

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