Aqueous ink receptive primer compositions and receiving media
An aqueous ink receptive primer composition is useful for pre-treating a water-absorptive substrate to prepare or prime the resulting inkjet receiving media for high quality and potentially high-speed inkjet printing. This aqueous ink receptive primer composition has 8-25% solids, and includes (a) one or more water-soluble salts of a multivalent metal cation, in a total amount of 0.1-30 weight %; (b) one or more water-soluble or water-dispersible polymeric binder materials in a total amount of 1-20 weight %, each having a M w of 50,000 to 180,000; and (c) fluorine-free wax particles composed of a water-insoluble composite that comprises one or more polymers comprising a polyalkylene, a polyester, or a polyimide, in an amount of 0.1-2 weight %. The noted composition on the water-absorptive substrate allows high-speed inkjet printing with reduced ink misting while maintaining high inkjet-printed image quality.
1 . An aqueous ink receptive primer composition for pre-treating a water-absorptive substrate prior to inkjet printing thereon, the aqueous ink receptive primer composition having at least 8% solids and up to and including 25% solids, and comprising at least the following components (a), (b), and (c):
(a) one or more water-soluble salts of a multivalent metal cation, which (a) one or more water-soluble salts are present in a total amount of at least 0.1 weight % and up to and including 30 weight %;
(b) one or more water-soluble or water-dispersible polymeric binder materials that are present in a total amount of at least 1 weight % and up to and including 20 weight %, each of which (b) one or more water-soluble or water-dispersible polymeric binder materials has a weight average molecular weight (M w ) of at least 50,000 and up to and including 180,000;
(c) fluorine-free wax particles composed of a water-insoluble composite comprising a polymer selected from a polyalkylene, a polyester, or a polyimide, which polymer is homogeneously combined in the water-insoluble composite with an inorganic material selected from an oxide, a carbide, a carbonate, and a phosphate, which inorganic material has a mean particle size below 1000 nm, and which (c) fluorine-free wax particles are present in an amount of at least 0.1 weight % and up to and including 2 weight %,
wherein the amounts of the components (a), (b), and (c) are based on the total weight of the aqueous ink receptive primer composition.
2 . The aqueous ink receptive composition of claim 1 , wherein the component (c) fluorine-free wax particles are composed of a water-insoluble composite comprising a polyalkylene that is homogenously combined with aluminum oxide, which (c) fluorine-free wax particles are present in an amount of at least 0.4 weight % and up to and including 1.2 weight %, based on the total weight of the aqueous ink receptive primer composition.
3 . The aqueous ink receptive primer composition of claim 1 , further comprising silica particles.
4 . The aqueous ink receptive primer composition of claim 3 , wherein the silica particles are colloidal silica particles, and are present in an amount of at least 0.3 weight % and up to and including 1.8 weight %, based on the total weight of the aqueous ink receptive primer composition.
5 . The aqueous ink receptive primer composition of claim 4 , wherein the colloidal silica particles are aluminum-stabilized colloidal silica particles.
6 . The aqueous ink receptive primer composition of claim 1 , wherein the component (b) one or more water-soluble or water-dispersible polymeric binder materials comprise one or more of a polyvinyl alcohol, an acetate derivative of polyvinyl alcohol, a copolymer derived at least in part from vinyl alcohol and ethylene oxide, or a combination of two or more of these polymeric materials.
7 . The aqueous ink receptive primer composition of claim 1 , wherein component (b) one or more water-soluble or water-dispersible polymeric binder materials are present in a total amount of at least 2 weight % and up to and including 10 weight %, based on the total weight of the aqueous ink receptive primer composition.
8 . The aqueous ink receptive primer composition of claim 1 , wherein each of the component (b) one or more water-soluble or water-dispersible polymeric binder materials has a weight average molecular weight (M w ) of at least 80,000 and up to and including 150,000.
9 . The aqueous ink receptive primer composition of claim 1 , wherein the component (c) fluorine-free wax particles are present in an amount of at least 0.4 weight % and up to and including 1.2 weight %, based on the total weight of the aqueous ink receptive primer composition.
10 . An inkjet receiving medium comprising a water-absorptive substrate and an aqueous ink receptive primer composition disposed on a surface thereof, which disposed aqueous ink receptive primer composition comprises the following components (a), (b), and (c):
(a) one or more water-soluble salts of a multivalent metal cation, which component (a) one or more water-soluble salts are present in a total amount of at least 20 weight % and up to and including 80 weight %;
(b) one or more water-soluble or water-dispersible polymeric binder materials that are present in a total amount of at least 10 weight % and up to and including 40 weight %, each of which component (b) one or more water-soluble or water-dispersible polymeric binder materials has a weight average molecular weight (M w ) of at least 50,000 and up to and including 180,000; and
(c) fluorine-free wax particles composed of a water-insoluble composite comprising a polymer selected from a polyalkylene, a polyester, or a polyimide, which polymer is homogeneously combined in the water-insoluble composite with an inorganic material selected from an oxide, a carbide, a carbonate, and a phosphate, which inorganic material has a mean particle size below 1000 nm, and which (c) fluorine-free wax particles are present in an amount of at least 2.5 weight % and up to and including 12 weight %, and
wherein the amounts of the components (a), (b), and (c) are based on the total weight of the disposed aqueous ink receptive primer composition.
11 . The inkjet receiving medium of claim 10 , wherein the disposed aqueous ink receptive primer composition has a dry solids coating weight of at least 0.2 g/m 2 and up to and including 2 g/m 2 .
12 . The inkjet receiving medium of claim 10 , wherein the component (c) fluorine-free wax particles are composed of a water-insoluble composite comprising a polyalkylene that is homogenously combined with aluminum oxide, which (c) fluorine-free wax particles are present in an amount of at least 2.5 weight % and up to and including 8 weight %, based on the total weight of the disposed aqueous ink receptive primer composition.
13 . The inkjet receiving medium of claim 10 , wherein the disposed aqueous ink receptive primer composition further comprises silica particles.
14 . The inkjet receiving medium of claim 13 , wherein the silica particles are aluminum-stabilized colloidal silica particles.
15 . The inkjet receiving medium of claim 10 , wherein the component (c) fluorine-free wax particles are composed of a composite of polyethylene that is homogenously combined with an oxide, which (c) fluorine-free wax particles and are present in an amount of at least 2.5 weight % and up to and including 8 weight %, based on the total weight of the disposed aqueous ink receptive primer composition.
16 . The inkjet receiving medium of claim 10 , wherein the water-absorptive substrate comprises one or more cellulosic materials in one or multiple layers.
17 . A method for providing an inkjet receiving medium comprising, in order the following Steps A and B:
A) providing a water-absorptive substrate; and
B) disposing an aqueous ink receptive primer composition onto at least one surface of the water-absorptive substrate, to provide an inkjet receiving medium having a disposed aqueous ink receptive primer composition on the at least one water-absorptive substrate surface, the disposed aqueous ink receptive primer composition comprising the following components (a), (b), and (c):
(a) one or more water-soluble salts of a multivalent metal cation, which component (a) one or more water-soluble salts are present in a total amount of at least 20 weight % and up to and including 80 weight %;
(b) one or more water-soluble or water-dispersible polymeric binder materials that are present in a total amount of at least 10 weight % and up to and including 40 weight %, each of which component (b) one or more water-soluble or water-dispersible polymeric binder materials has a weight average molecular weight (M w ) of at least 50,000 and up to and including 180,000; and
(c) fluorine-free wax particles composed of a water-insoluble composite comprising a polymer selected from a polyalkylene, a polyester, or a polyimide, which polymer is homogeneously combined in the water-insoluble composite with an inorganic material selected from an oxide, a carbide, a carbonate, and a phosphate, which inorganic material has a mean particle size below 1000 nm, and which (c) fluorine-free wax particles are present in an amount of at least 2.5 weight % and up to and including 12 weight %, and
wherein the amounts of the components (a), (b), and (c) are based on the total weight of the disposed aqueous ink receptive primer composition.
18 . The method of claim 17 , wherein step B) is carried out using forward roll coating or flexographic printing.
19 . The method of claim 17 , wherein step B) is carried out subsequently to preparing the water-absorptive substrate in an in-line process.
20 . The method of claim 17 , wherein the disposed aqueous ink receptive primer composition further comprises silica particles.
21 . The method of claim 20 , wherein the silica particles are colloidal silica particles, and are present in an amount of at least 0.3 weight % and up to and including 1.8 weight %, based on the total weight of the aqueous ink receptive primer composition.
22 . The method of claim 17 , wherein the component (b) one or more water-soluble or water-dispersible polymeric binder materials are present in the disposed aqueous ink receptive primer composition in a total amount of at least 15 weight % and up to and including 35 weight %, based on the total weight of the disposed aqueous ink receptive primer composition.
23 . The method of claim 17 , wherein each of the component (b) one or more water-soluble or water-dispersible polymeric binder materials has a weight average molecular weight (M w ) of at least 80,000 and up to and including 150,000.
24 . The method of claim 17 , wherein the component (c) fluorine-free wax particles are present in the disposed aqueous ink receptive primer composition in an amount of at least 2.5 weight % and up to and including 8 weight %, based on the total weight of the disposed aqueous ink receptive primer composition.
25 . The method of claim 17 , wherein the water-absorptive substrate is a glossy, semi-glossy, or matte-coated lithographic offset paper.