Patent ID: 6964703

Claim:
Starch-based glue paste composition comprising a mixture of a carrier paste and a main paste, wherein: the carrier paste is a starch-based paste composed of a starch selected from the group consisting of corn starch, wheat starch, rye starch, oat starch, barley starch, potato starch, tapioca starch and pea starch, each being native starch or chemically modified starch, or any mixture thereof, water and an alkali base, wherein the starch is present in a concentration ranging from 5 to 16 wt % based on the total amount of water in the carrier paste, and the alkali base is present in an amount ranging from 10 to 25 wt %, calculated as sodium hydroxide and based on the amount (dry substance) of the starch in the carrier paste; the main paste is a starch-based paste composed of a mixture of (i) native rice starch which contains from 12 to 20 wt % amylose, about 1 wt % other compounds, and a complementary 87 wt % to 79 wt % amylopectin, or an acetylated version of the native rice starch containing from 0.25 to 2.5 wt % acetyl groups on dry starch content, and (ii) a starch selected from the group consisting of corn starch, wheat starch, rye starch, oat starch, barley starch, potato starch, tapioca starch and pea starch, each being native starch or chemically modified starch, or any mixture thereof, water, and sodium borate, wherein the native rice starch or acetylated version thereof is present in an amount ranging from 10 to 30 wt % on the total starch content (dry substance) of the main paste, the total amount of starches in the main paste ranges from 25 to 50 wt %, based on the total amount of the main paste, and sodium borate (calculated as anhydrous borax) is present in an amount ranging from 0.3 to 3 wt % based on the amount of the starch (dry substance) in the main paste; and the weight ratio main paste carrier paste ranges from 1:1 to 3:1.