Light-blocking high opacity articles

A foamed, opacifying element comprising a substrate having two opposing surfaces and a dry foamed composition disposed on at least one of the two opposing surfaces of the substrate,

• wherein the substrate comprises a porous fabric comprising a plurality of continuous yarn strands, all woven together, wherein each yarn strand comprises a multifilament core that is coated with a coating comprising a thermoplastic polymer, and
• 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 70 weight % of a matrix material that is derived from a (b) binder material having a glass transition temperature (Tg) of less than 25° C.;
• (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, foaming agents, foam stabilizing agents, plasticizers, flame retardants, optical brighteners, thickeners, biocides, tinting colorants, metal particles, and inert 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 electromagnetic radiation having a wavelength of at least 380 nm and up to and including 800 nm,
• all amounts being based on the total weight of the dry foamed composition,
• the foamed, opacifying element having a light-blocking value (LBV) of at least 4.