Patent ID: 7067651

Claim:
A process for preparing non-synthetic, biodegradable starch-based composition for shaped-bodies comprising mixing and kneading starch, water, and optionally plasticizer, reinforcing filler, binder, alkali or salt; until a uniform mixture is obtained and thereafter injecting or compressing said mixture into a closed mould at temperature 150–300 degree Celsius until gelatinization of starch is accomplished to give a product of desired shape; where said starch used is 30–70% by weight of the composition of starch prepared from cassava, rice, glutinous rice, sweet potato, corn, potato, sorghum or sago, either singly or as mixture, in form of flour or starch or modified starch; where said plasticizer used is up to 10% by weight of the composition selected from the following groups consisting of polyols which are glycerol or sorbitol, or saccharides which are sugar, glucose, fructose, glucose syrup and honey; or lipids or their derivatives which are fatty acid, fatty acid esters, monoglycerides, diglycerides, distilled acetylated monoglyceride or phospholipid, which may be used singly or as mixture; where said reinforcing filler used is up to 30% by weight of the composition which are limestone powder, diatomaceous earth, bentonite, cassava pulp or natural fibrous materials, and may be used singly or as mixture; where said binder used is up to 5% by weight selected from the following groups consisting of hydrocolloids which are alginate, gum, agar, carrageenan and konjak flour, or proteins which are egg white or soy protein or any of animal or plant origin, which may be used singly or as mixture; where said alkali or salt is selected from calcium hydroxide, sodium hydroxide, potassium hydroxide, calcium carbonate, sodium carbonate, potassium carbonate, ammonium carbonate, sodium bicarbonate and ammonium bicarbonate, which may be used singly or as mixture added to make the pH of the mixture close to neutral or slightly alkaline; and where water is added to make up said composition a total of 100% by weight.