Patent ID: 6277445
Filing Date: 2001-08-21
Classification: C09D,D21H

Abstract:
A waterproofing method of a paperboard for plasterboard covering, comprising:(a) coating at least one of the surfaces of a paperboard with an aqueous emulsion composition comprising:(A) water as a medium;(B) a surface active agent dissolved in water as the medium; and(C) a modified organopolysiloxane compound in the form of an emulsion dispersed in water as the medium, wherein the modified organopolysiloxane compound has a chemical structure represented by the general formula:R.sup.3 --SiR.sup.1.sub.2 --O--(--SiR.sup.1.sub.2 --O--).sub.m --(--SiR.sup.1 R.sup.2 --O--).sub.n --SiR.sup.1.sub.2 --R.sup.3,wherein:R.sup.1 is, each independently from the others, an unsubstituted or substituted monovalent hydrocarbon group having 1 to 20 carbon atoms;R.sup.2 is, each independently from the others, a monovalent organic group represented by the general formula --R.sup.4 (NR.sup.5 CH.sub.2 CH.sub.2).sub.a NR.sup.6 R.sup.7, R.sup.4 being a divalent hydrocarbon group having 1 to 6 carbon atoms, R.sup.5 and R.sup.6 each being, independently from the other, a hydrogen atom, monovalent hydrocarbon group having 1 to 6 carbon atoms or R7 which is a monovalent organic group of the formula --CO--R.sup.8 --CO--OH, R.sup.8 being a divalent hydrocarbon group having 2 to 10 carbon atoms, and the subscript a being 0 or a positive integer not exceeding 4;R.sup.3 is a hydroxyl group, hydrocarbyloxy group having 1 to 6 carbon atoms, R.sup.1 or R.sub.2 ;the subscript m is a positive number in the range from 10 to 1000; andthe subscript n is 0 or a positive number not exceeding 100 with the proviso that, when the subscript n is equal to 0, at least one of the groups denoted by R.sup.3 is R.sup.2 ;of which the content of the organopolysiloxane compound is in the range from 0.1 to 2% by weight; and(b) heating the paperboard coated with the aqueous emulsion composition.