Patent ID: 7678232
Filing Date: 2010-03-16
Classification: C08F,C08G,D21H

Abstract:
1. A method of making a paper sheet comprising: (a) forming an aqueous suspension of papermaking fibers; (b) adding to the aqueous suspension, prior to web formation, a water soluble or water dispersible aldehyde functional ionic polymer followed by the addition of a paper modifying agent having a non-hydroxyl aldehyde reactive functional group, which react according to the following reaction: (c) filtering and washing the papermaking fibers containing the aldehyde functional ionic polymer reacted with derivatized paper modifying agent; (d) depositing the aqueous suspension of papermaking fibers onto a forming fabric to form a web; and (e) dewatering and drying the web to form a paper sheet, wherein: b, c, f>0; a, e≧0; e+f=b; w≧1; Q R R R Z Z Q