Patent ID: 11046483

Abstract:
A cup or food container has a coating formed of a styrene acrylic copolymer emulsion. There may be one or more coating layers on the inside surface of the cup or container. Importantly, the cup or container does not have any petroleum-based paraffin or polymer material or functionally similar hydrogenated triglyceride material coated on or incorporated in the cup or container. The paper substrate onto which the styrene acrylic copolymer emulsion is coated must have adequate sizing incorporated therein so that the coating forms a relatively smooth surface. Differently-sourced paper may require different amounts of sizing according to the particular paper being used. The cup or container may have a primer coating applied thereto before the styrene acrylic copolymer is coated on. Optionally, the uncoated paper stock that forms the cup or food container is calendared between rolls before coating.