Coating composition for paper and paper boards containing starch and smectite clay
AssigneeAlbion Kaolin Company
InventorThomas D. Thompson
Life of this patent
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Abstract
An aqueous coating composition for paper or paper boards comprising a mixture of smectite clay with starch in an aqueous solution wherein the starch comprises about 75 to about 95 percent by weight and the swellable clay comprises about 5 to about 25 percent by weight of the solids content of the aqueous coating composition. In addition, there is disclosed a process for the production of an aqueous coating composition for paper containing a smectite clay.
Claims24
An aqueous coating composition for the coating of paper or paper boards comprising from about 5 to about 25 percent by weight solids, wherein the solids comprise
- about 75 to about 95 parts by weight of a cooked, substantially hydrated starch and
- about 5 to about 25 parts by weight of a smectite clay.
A process for the coating of paper with an aqueous coating composition comprising
- preparing an uncoated paper product,
- preparing a smectite clay, wherein the smectite clay has been substantially cleaned,
- preparing a starch solution by cooking the starch solution for a sufficient period of time to hydrate substantially the starch,
- combining the smectite clay with the starch solution to produce a smectite clay/starch coating composition wherein the coating composition contains about 5 to about 25 percent by weight solids, wherein the solids comprise about 5 to about 25 percent smectite clay and about 95 to about 75 percent starch, and
- coating the uncoated paper product with the coating composition to produce a finished paper product.
A process for the coating of paper with an aqueous coating composition comprising
- preparing an uncoated paper product,
- preparing a smectite clay, wherein the smectite clay has been substantially cleaned,
- preparing a starch solution,
- combining the smectite clay with the starch solution to produce a smectite clay/starch coating composition wherein the coating composition contains about 5 to about 25 percent by weight solids, wherein the solids comprise about 5 to about 25 percent smectite clay and about 95 to about 75 percent starch,
- cooking the smectite clay/starch coating composition for a sufficient period of time and at a sufficient temperature to hydrate substantially the starch, and
- coating the uncoated paper product with the coating composition to produce a finished paper product.
Dependencies are inferred from the claim text.