Anti-fogging coating and non-fogging coated polystyrene article

Claim 1

A NON-FOGGING TRANSPARENT POLYSTYRENE FILM FOR PACKAGING FOOD PRODUCTS, SAID FILM HAVING APPLIED TO AT LEAST ONE SIDE THEREOF A COATING IN A THICKNESS OF ABOUT 25 TO 125 MICROGRAMS PER SQUARE INCH, SAID COATING CONSISTING ESSENTIALLY OF 30-40% OF NITTOCELLULOSE, 35-45% OF A MODIFYING RESIN CAPABLE OF FORMING A TRANSPARENT, FLEXIBLE, TENACIOUS COMPOSITION WHEN ADMIXED WITH NITROCELLULOSE AND SELECTED FROM THE GROUP CONSISTING ESSENTIALLY OF RESIN MADE BY REACTING MALEIC ANBYDRIDE AND ROSIN ACID, ALKYD RESINS, COUMARONE-INDENE RESIN, UREAFORMALDEHYDE RESINS, GUM DAMAR AND POLYACRYLATE ESTERS, 10 TO 15% OF A DIALKYL PHTHALATE OF 4 TO 8 CARBON ATOMS PER ALKYL GROUP AS A PLASTICIZER FOR THE NITROCELLULOSE, AND 8 TO 20% OF AN AMMONIUM OR ALKALI METAL SALT OF A SULFATED FATTY ALCOHOL OF ABOUT 10 TO 22 ATOMS PER MOLECULE AS A MOISTURE-SPREADING SURFACTANT.