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Coated paper is "paper which has been "coated by a mixture of materials or a "polymer to impart certain qualities to the paper, including weight, surface gloss, smoothness or reduced ink absorbency. Various materials, including "Kaolinite, "calcium carbonate, "Bentonite, and "talc can be used to coat paper for high quality printing used in "packaging industry and in magazines. The "chalk or "china clay is bound to the paper with synthetic viscosifiers, such as "styrene-butadiene "latexes and natural organic binders such as "starch. The coating formulation may also contain chemical additives as dispersants, "resins, or "polyethylene to give water resistance and "wet strength to the paper, or to "protect against ultraviolet radiation.
Machine-finished coated paper (MFC) has a "basis weight of 48–80 g/m2. They have good surface properties, high print gloss and adequate sheet stiffness. MFC papers are made of 60–85% "groundwood or "TMP and 15–40% chemical pulp with a total "pigment content of 20–30%. The paper can be soft nip "calendered or "supercalendered. These are often used in "paperbacks.
Other types of paper coatings include "polyethylene or "polyolefin "extrusion coating, "silicone, and "wax coating to make "paper cups and "photographic paper. "Biopolymer coatings are available as more sustainable alternatives to common "petrochemical coatings like "LDPE (see "plastic-coated paper) or "mylar.
Printed papers commonly have a top coat of a protective polymer to seal the print, provide scuff resistance, and sometimes gloss. Some coatings are processed by "UV curing for stability.
Heat printed papers such as receipts are often coated with estrogenic and carcinogenic poisons, such as "BPA. It is possible to check whether a piece of paper is coated, as it will quickly turn deep black when the ember of a cigarette is applied. (see "thermal paper)
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