Appeal No. 95-4723
Application No. 08/028,420
Appellants’ invention relates to a method of preparing photosensitive polymers comprising a
polymeric backbone and a quaternary heterocyclic pendant group. The pendant group may be
prepared by a condensation step, i.e., reacting an aldehyde substituted aromatic compound with an
alkyl substituted nitrogen-containing heterocyclic compound to form a first reaction product having
ethylenic unsaturation and a quaternary or quaternizable nitrogen atom, followed by quaternization step,
i.e., reacting the first reaction product with a substituted or unsubstituted alkyl, aralkyl, or hetero
reactive compound having one or more terminal groups selected from the group consisting of halogen,
ether and aldehyde to form a second reaction product having a quaternary nitrogen atom (claim 23).
Alternatively, the quaternization and condensation steps may be reversed in preparing the pendant
group, i.e., a substituted or unsubstituted alkyl, aralkyl, or hetero reactive compound having one or
more terminal groups selected from the group consisting of halogen, ether, and aldehyde is reacted with
an alkyl substituted nitrogen-containing heterocyclic compound to form a first reaction product having a
quaternary nitrogen atom, followed by reacting the first reaction product with an aldehyde substituted
aromatic compound to form a second reaction product having ethylenic unsaturation and a quaternary
nitrogen atom (claim 31). In either case, about 0.1 to 20 mol % of the second reaction product or
pendant group is then grafted onto the polymeric backbone through the residue of the reactive
compound used in the quaternization step. (See specification, pages 10-11 and 17-18.) Claim 23 is
illustrative and reads as follows:
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Last modified: November 3, 2007