Opacifying articles
An opacifying article has a (i) fabric having a face side and a back side and an (ii) opacifying element having a substrate that has first and second opposing surfaces; and a dry opacifying layer that has an inner surface and an outer surface. The dry opacifying layer is disposed with its inner surface in contact with the first opposing surface of the substrate. The dry opacifying layer has (a) 40-90 weight % of porous particles, each having a continuous polymeric phase and discrete pores dispersed within the continuous polymeric phase. The porous particles have a mode particle size of 2-50 μm and a porosity of 20-70 volume %. The dry opacifying layer also contains (b) 10-60 weight % of a binder material. The (ii) opacifying element is laminated to the back side of the fabric to provide the opacifying article.
1. An opacifying article having an optical density of at least 3 and an L* that is at least 70, and comprising:
(i) a fabric having a face side and a back side; and
(ii) an opacifying element that is laminated to the back side of the fabric, the opacifying element comprising: a substrate that has first and second opposing surfaces; and a dry non-foamed opacifying layer that has an inner surface and an outer surface, and which dry non-foamed opacifying layer is disposed with its inner surface in contact with the first opposing surface of the substrate,
the dry non-foamed opacifying layer comprising:
(a) at least 40 weight % and up to and including 90 weight % of porous particles, each porous particle comprising a continuous polymeric phase and 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 and a porosity of at least 20 volume % and up to and including 70 volume %; and
(b) at least 10 weight % and up to and including 60 weight % of a binder material,
all amounts of (a) porous particles and (b) binder material being based on the total weight of the dry non-foamed opacifying layer.
2. The opacifying article of claim 1 , wherein the dry non-foamed opacifying layer further comprises at least 0.001 weight % and up to and including 0.5 weight % of (c) an opacifying colorant, based on the total dry weight of the dry non-foamed opacifying layer, which opacifying colorant is capable of absorbing electromagnetic radiation having a wavelength of at least 380 nm and up to and including 800 nm.
3. The opacifying article of claim 2 , wherein the (c) opacifying colorant is present in an amount of at least 0.001 weight % and up to and including 0.3 weight %, based on the total weight of the dry non-foamed opacifying layer.
4. The opacifying article of claim 2 , wherein the (c) opacifying colorant is a carbon black, a neutral black pigment or dye other than a carbon black, or a combination of two or more of such materials.
5. The opacifying article of claim 1 , wherein the outer surface of the dry non-foamed opacifying layer is laminated to the back side of the fabric.
6. The opacifying article of claim 1 , wherein the second opposing surface of the substrate is laminated to the back side of the fabric.
7. The opacifying article of claim 1 , further comprising a second dry non-foamed opacifying layer disposed on the second opposing surface of the substrate.
8. The opacifying article of claim 1 , further comprising an adhesive material arranged between the (i) fabric and the (ii) opacifying element.
9. The opacifying article of claim 1 , further comprising an adhesive material within the dry non-foamed opacifying layer.
10. The opacifying article of claim 8 , wherein the adhesive material is a heat seal adhesive or a cold seal adhesive.
11. The opacifying article of claim 8 , wherein the adhesive material comprises a material selected from the group consisting of polyamides, polyurethanes, epoxy resins, polyesters, acrylic resins, anhydride modified polyolefin, and blends thereof.
12. The opacifying article of claim 1 , further comprising an antimicrobial agent, fire retardant, or both an antimicrobial agent and a fire retardant.
13. The opacifying article of claim 1 , wherein the substrate comprises a polymeric material selected from the group consisting of polyesters, cellulosic materials, noncyclic polyolefins, cyclic olefin polymers, polyamides, ethylene vinyl acetate, poly(vinyl chloride), poly(vinylidene chloride), and blends thereof.
14. The opacifying article of claim 1 , wherein the dry non-foamed opacifying layer further comprises one or more (e) additives selected from the group consisting of dispersants, plasticizers, flame retardants, optical brighteners, thickeners, biocides, tinting colorants, inert inorganic or organic fillers, and a combination of any of these materials.
15. The opacifying article of claim 1 , wherein the (b) binder material has a glass transition temperature (T g ) of less than 25° C.
16. The opacifying article of claim 1 , wherein the dry weight ratio of the (a) porous particles to the (b) binder material in the dry non-foamed opacifying layer is at least 2:3 and up to and including 9:1.
17. The opacifying article of claim 1 , wherein the dry coverage of the dry opacifying layer is at least 50 g/m 2 and up to and including 1000 mg/m 2 .
18. The opacifying article of claim 1 , wherein the (a) porous particles have a mode particle size of at least 3 μm and up to and including 20 μm and a porosity of at least 20% and up to and including 65%; and a carbon black as (c) an opacifying colorant is present in discrete pores of the (a) porous particles in an amount of at least 0.003 weight % and up to and including 0.3 weight %, based on the total weight of the dry non-foamed opacifying layer.
19. The opacifying article of claim 1 , further comprising a surface finish selected from the group consisting of flock, lubricants, anti-blocking agents, antistatic agents, tactile modifiers, visual modifiers, and soil resistance agents.
20. An opacifying article having an optical density of at least 3 and an L* that is at least 90, and comprising:
(i) a fabric having a face side and a back side; and
(ii) an opacifying element that is laminated to the back side of the fabric, the opacifying element comprising: a substrate that has first and second opposing surfaces; and a dry non-foamed opacifying layer that has an inner surface and an outer surface, and which dry non-foamed opacifying layer is disposed with its inner surface in contact with the first opposing surface of the substrate,
the dry non-foamed opacifying layer comprising:
(a) at least 40 weight % and up to and including 90 weight % of porous particles, each porous particle comprising a continuous polymeric phase and 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 and a porosity of at least 20 volume % and up to and including 70 volume %;
(b) at least 10 weight % and up to and including 60 weight % of a binder material;
(c) at least 0.003 weight % and up to and including 0.3 weight % of an opacifying colorant that is capable of absorbing electromagnetic radiation having a wavelength of at least 380 nm and up to and including 800 nm;
(d) an aqueous medium in an amount of less than 5 weight %; and
(e) at least 0.0001 weight % and up to and including 20 weight % of one or more additives including a surfactant, which one or more additives are different from the (c) opacifying colorant,
wherein all amounts of (a) porous particles, (b) binder material, (c) opacifying colorant, (d) aqueous medium, and (e) one or more additives are based on the total weight of the dry non-foamed opacifying layer.