Browse Prior Art Database

USE OF CELLULOSIC DERIVATIVES STABILIZED POLYSTYRENE PARTICLES AS BRIGHTENER AND OPACIFIER IN PAPER MODIFICATION

IP.com Disclosure Number: IPCOM000025373D
Original Publication Date: 1984-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 71K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a process for affecting modification of paper materials wherein there results increased opacity and brightness for such materials. This is accomplished by adding thereto a stable dispersion of monodispersed particles comprised of a thermoplastic resin core insoluble in the dispersion medium formed from a styrene or butylmethacrylate containing polymer having irreversibly anchored thereto a non-ionic amphipathic steric stabilizer comprising a graft copolymer having a portion formed from a styrene or butylmethacrylate containing monomer or mixtures thereof and a portion from hydroxyethyl cellulose, hydroxypropyl cellu-lose, hydroxybutylmethyl cellulose, hydroxypropylmethyl cellulose, ethyl cellulose, or cellulose propronate.

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XEROX DISCLOSURE JOURNAL

USE OF CELLULOSIC DERIVATIVES STABILIZED POLYSTYRENE PARTICLES AS BRIGHTENER AND OPACIFIER IN PAPER MODIFICATION
Kar P. Lok
Arthur Jones

Proposed Classification
U.S. C1. 430/950

Int. CI. G03c 1/02

Disclosed is a process for affecting modification of paper materials wherein there results increased opacity and brightness for such materials. This is accomplished by adding thereto a stable dispersion of monodispersed particles comprised of a thermoplastic resin core insoluble in the dispersion medium formed from a styrene or butylmethacrylate containing polymer having irreversibly anchored thereto a non-ionic amphipathic steric stabilizer comprising a graft copolymer having a portion formed from a styrene or butylmethacrylate containing monomer or mixtures thereof and a portion from hydroxyethyl cellulose, hydroxypropyl cellu- lose, hydroxybutylmethyl cellulose, hydroxypropylmethyl cellulose, ethyl cellulose, or cellulose propronate.

The polymer dispersion can be prepared by adding to a solution of hydroxypropyl cellulose and ethanol-water, styrene, followed by heating. Electron microscopic analysis of the milky dispersion indicated that the polymer particles had a spherical shape that was of a size of less than one micron. Thereafter, the resulting dried polymer product was redispersed in water and electron microscopy indicated that each particle existed as an individual entity. Hand sheets can then be treated with this dispersion by soaking...