Opacified paper sheet and method for production thereof
AssigneeChampion International Corporation
InventorsDavid N. Vincent, Ronald Golden
Life of this patent
Estimating the term…
Abstract
Opacifying agents, which may be coated onto or incorporated into paper sheets, consisting essentially of spherical aldehyde condensation polymeric super-particles, each having a spherical, discontinuous shell surrounding a spherical hollow core, said shell composed of agglomerated, discrete spherical aldehyde condensation polymeric secondary particles which are solid throughout. The opacifying agents are incorporated into paper sheets by admixing cellulosic fibers with the super-particles.
Claims24
A process for the formation of opacified paper sheet, which comprises admixing cellulosic fibers and opacifying agents consisting essentially of substantially spherical aldehyde condensation polymeric super-particles, each of said super-particles having a substantially spherical, discontinuous shell composed of agglomerated, discrete, aldehyde condensation polymeric secondary particles, said shell surrounding a substantially spherical hollow core, said secondary particles being substantially spherical and substantially solid throughout, and forming said admixture into a paper sheet.
A paper sheet consisting essentially of cellulosic fibers having opacifying agents incorporated therein, said opacifying agents consisting essentially of substantially spherical aldehyde condensation polymeric super-particles, each of said super-particles having a substantially spherical, discontinuous shell composed of agglomerated, discrete, aldehyde condensation polymeric secondary particles, said shell surrounding a substantially spherical hollow core, said secondary particles being substantially spherical and substantially solid throughout.
A paper sheet consisting essentially of cellulosic fibers having opacifying agents coated thereon, said opacifying agents consisting essentially of substantially spherical aldehyde condensation polymeric super-particles, each of said super-particles having a substantially spherical, discontinuous shell composed of agglomerated, discrete, aldehyde condensation polymeric secondary particles, said shell surrounding a substantially spherical hollow core, said secondary particles being substantially spherical and substantially solid throughout.
Dependencies are inferred from the claim text.