Water insoluble alpha-(1,3-glucan) composition
First Claim
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1. A substrate, wherein at least a portion of the substrate is coated with a layer of a coating composition, the coating composition comprising:
- i) water insoluble α
-(1,3→
glucan) polymer having 90% or greater a-1,3-glycosidic linkages, less than 1% of α
-1,3,6-glycosidic branch points and a number average degree of polymerization in the range of 55 to 10,000; and
ii) at least one pigment, at least one binder, or a combination thereof wherein the layer of coating composition comprises an average pore volume in the range of 0.1 to 0.50 milliliters/gram as measured by mercury porosimetry.
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Abstract
The disclosure relates to a coating composition that can be applied to a substrate, especially a cellulose substrate. A layer of the coating composition applied to the substrate provides an excellent ink receptive layer and can be used as a coating on paper. The disclosure also relates to aqueous compositions and method for applying the layer of the coating composition onto the substrate.
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Citations
19 Claims
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1. A substrate, wherein at least a portion of the substrate is coated with a layer of a coating composition, the coating composition comprising:
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i) water insoluble α
-(1,3→
glucan) polymer having 90% or greater a-1,3-glycosidic linkages, less than 1% of α
-1,3,6-glycosidic branch points and a number average degree of polymerization in the range of 55 to 10,000; andii) at least one pigment, at least one binder, or a combination thereof wherein the layer of coating composition comprises an average pore volume in the range of 0.1 to 0.50 milliliters/gram as measured by mercury porosimetry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of forming a layer of a coating composition on a substrate comprising:
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1) applying an aqueous coating composition to at least a portion of a substrate, wherein the aqueous coating composition comprises; i) water insoluble α
-(1,3→
glucan) polymer having 90% or greater a-1,3-glycosidic linkages, less than 1% α
-1,3,6-glycosidic branch points and a number average degree of polymerization in the range of 55 to 10,000ii) a pigment, a binder, or a combination thereof; iii) an aqueous carrier; and 2) removing at least a portion of the aqueous carrier from the applied layer of the aqueous coating composition to form the layer of the coating composition, wherein the layer of coating composition comprises an average pore volume in the range of 0.1 to 0.50 milliliters/gram as measured by mercury porosimetry. - View Dependent Claims (18, 19)
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Specification