Acetal polymers useful in photosensitive compositions

US5534381A · kind A · utility

Assignee

• Minnesota Mining and Manufacturing Company · US

Inventors

• M. Zaki Ali · Woodbury, US
• Mahfuza B. Ali · Mendota Heights, US

Key dates

• Filing date: Jul 6, 1995
• Grant date: Jul 9, 1996
• Expiry date: Jul 6, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F8/48
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

This invention is an acetal polymer having the following repeating units: ##STR1## where R is an alkyl group of 1 to 10 carbon atoms; PA1 Ar.sub.1 is an aromatic group substituted with an aliphatic group containing 3 to 20 carbon atoms or an alkoxy group having 3 to 20 carbon atoms; PA1 Ar.sub.2 is a non-substituted aromatic group; PA1 A.sub.1 is an acid group; PA1 n.sub.1, n.sub.2, n.sub.3, n.sub.4, n.sub.5 represent the molar percents of the respective repeating units and n.sub.1 is 0-20 mole %, preferably 2-10 mole %; n.sub.2 is 2-20 mole %, preferably 5 to 15 mole %; n.sub.3 is 15-85 mole %, preferably 20 to 65 mole %; n.sub.4 is 0 to 40 mole %, preferably 0 to 20 mole %; and n.sub.5 is 5-40 mole %, preferably 20 to 35 mole %. These polymers may be used in photosensitive compositions and lithographic printing plates.