FOAMED, OPACIFYING ELEMENTS

摘要

A foamable aqueous composition can be used to form foamed, opacifying elements with one or more dry foamed layers. These compositions generally contain: (a) 0.5 to 20 weight % of porous particles comprising a continuous polymeric phase and discrete pores dispersed within the continuous polymeric phase. The porous particles have a mode particle size of 2 to 50 μm; (b) at least 20 weight % of a binder material; (c) 0.1 to 30 weight % of a combination of various additives including dispersants, plasticizers, inorganic or organic pigments and dyes, flame retardants, biocides, fungicides, optical brighteners, tinting colorants, metal flakes, and inorganic or organic fillers; (d) water; and (e) at least 0.001 weight % of an opacifying colorant different from (c). The foamable aqueous composition is suitably aerated, disposed on a porous substrate, dried, and crushed on the porous substrate to form a foamed, opacifying element.

主权项

1. A foamed, opacifying element comprising a porous substrate and a dry foamed composition disposed on the porous substrate,
wherein the dry foamed composition comprises: (a) at least 0.1 weight % and up to and including 40 weight % of porous particles, each porous particle comprising a continuous polymeric phase and a first set of discrete pores dispersed within the continuous polymeric phase, the porous particles having a mode particle size of at least 2 μm and up to and including 50 μm; (b) at least 10 weight % and up to and including 80 weight % of an at least partially cured binder material; (c) at least 0.2 weight % and up to and including 50 weight % of one or more additives selected from the group consisting of dispersants, plasticizers, inorganic or organic pigments and dyes, flame retardants, optical brighteners, thickeners, biocides, fungicides, tinting colorants, metal flakes, and inorganic or organic fillers; (d) less than 5 weight % of water; and (e) at least 0.002 weight % of an opacifying colorant different from all of the one or more additives of (c), which opacifying colorant absorbs predetermined electromagnetic radiation, all amounts being based on the total weight of the dry foamed composition.