Coated fillers having silicic acid for heat-sensitive recording materials
AssigneeSud-Chemie AG
InventorsReinhard Hahn, Friedrich Ruf
Life of this patent
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Abstract
A particulate composition to be used as a filling material in the heat-sensitive layer of a heat-sensitive recording material is described. The material is characterized by the fact that it occurs as fine-grained white pigments which are predominantly bound to amorphous precipitated silicic acid, whereby the amorphous precipitated silicic acid either (a) is wrapped in layers around the fine-grained white pigment or (b) occurs as fine particles that are bound to the fine-grained white pigment in a punctiform manner and whereby the water content of the material (b) is 1 to 10 percent by weight, preferably 2 to 8 percent by weight.
Claims25
A particulate composition to be used as filling material in a heat-sensitive layer of a heat-sensitive recording material comprising fine-grained white pigments substantially bound to amorphous precipitated silicic acid wherein the amorphous precipitated silicic acid is wrapped in a layer around the fine-grained white pigment.
A particulate composition to be used as filling material in a heat-sensitive layer of a heat-sensitive recording material comprising fine-grained white pigments most of which are bound to amorphous precipitated silicic acid wherein the amorphous precipitated silicic acid is bound to the fine-grained white pigment in a punctiform manner, and wherein the water content is about 1 to about 10 percent by weight based on the total weight of said composition.
Dependencies are inferred from the claim text.