Base paper for eco-friendly paper cups

A base paper for eco-friendly paper cups, comprising:

• a basic paper;
• and
• a double-coating layer formed on the basic paper,
• wherein the base paper for eco-friendly paper cups has heat sealability, water resistance, and block resistance, facilitates recycling, and is biodegradable in nature,
• wherein the double-coating layer comprises:
• a first coating layer formed of a first coating liquid applied onto the basic paper;
• and
• a second coating layer formed of a second coating liquid applied onto the first coating layer,
• wherein the double-coating layer is given heat sealability and water resistance by the first coating layer and given block resistance by the second coating layer,
• wherein the second coating liquid comprises a second resin for giving block resistance, a second defoamer for removing bubbles, silica for preventing surface stickiness, and a wetting agent for improving coating coverage,
• wherein the second resin has a glass transition temperature higher than a temperature during the manufacturing of paper cups and thus gives block resistance to the base paper for eco-friendly paper cups, and
• wherein the second resin is an aqueous copolymer latex, which is prepared by the emulsion polymerization of a monomer mixture containing an acrylic-based monomer and a carboxylic acid-based monomer in the presence of a reactive emulsifier and a multifunctional silicone polymer and contains repeating units derived from the acrylic-based and carboxylic acid-based monomers in a proportion of 80% or more relative to the total repeating units, the second resin having a solid content of 45.7 wt %, a glass transition temperature (Tq) of 22° C., and a minimum film forming temperature (METT) of 20° C.