Characteristic of PVA Resins Esterified with Anhydride as Binders Used in the Negative PS Plate

doi:10.7517/j.issn.1674-0475.2009.02.121

Imaging Science and Photochemistry ›› 2009, Vol. 27 ›› Issue (2): 121-127.DOI: 10.7517/j.issn.1674-0475.2009.02.121

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Characteristic of PVA Resins Esterified with Anhydride as Binders Used in the Negative PS Plate

KUANG Liang-ju, ZOU Ying-quan, YANG Xing-xing

Department of Chemistry, Beijing Normal University, Beijing 100875, P. R. China

Received:2008-07-18 Revised:2008-11-26 Online:2009-03-23 Published:2009-03-23

Abstract

Abstract: Modified polyvinyl alcohols (PVA) were synthesized by condensation reaction of PVA with butyraldehyde and then by the esterification reaction with acid anhydride.They were applied to photosensitive composition of negative presensitized plate (PS plate) composed with binder,diazo resin,background dyes and organic solvents.The composition and the imaging performance were studied.The result indicated that modified PVA resin had decisive effect on developability,ink receptivity and scratch resistance and also had strong influence on shelf life and photosensitivity.In addition,when the modified PVA resins fulfilled requirements in the following: 1) the acetalization degree varied from 60 mol% to 80 mol%, 2) the esterification degree varied from 10 mol% to 20 mol%, 3) the amount of hydroxyl group was 5-25 mol%, 4) the range of value of B/P (the mass ratio of the binder to diazo resin) was from 4 to 4.5, 5) the range of its molecular weight was from 4×10⁵ to 8×10⁵,the negative PS plate obtained had excellent sensitivity,hydrophobic property,good developability,good ink receptivity and good scratch resistance.

Key words: negative PS plate, modified PVA, diazo resin

CLC Number:

TQ57

KUANG Liang-ju, ZOU Ying-quan, YANG Xing-xing. Characteristic of PVA Resins Esterified with Anhydride as Binders Used in the Negative PS Plate[J]. Imaging Science and Photochemistry, 2009, 27(2): 121-127.

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Characteristic of PVA Resins Esterified with Anhydride as Binders Used in the Negative PS Plate

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