| abstract |
The invention relates to a process for producing capsule or microcapsule containing cellulose and/or starch. The process according to the invention can be characterized in that 0-50 % by weight of polymers are added to the capsule material of natural origin at a temperature of 10 to 50°C, the suspension is vigorously stirred, thereafter 0 to 50 % by weight of urea-formaldehyde resin pre-condensate are admixed, the colloidal solution thus obtained is applied onto the acid mixture - preferably with 10 % by weight of sulphur acid - containing 0.1 to 5 % by weight of cross-linking catalyst, expediently ammonium sulfate, furtheron 0.01 to 5 % by weight of ethoxylated amine surface-active material, the capsules thus obtained are washed and dried at 40 to 100°C, thereafter different active ingredients respectively the solutions thereof are contacted with the capsule, at last the blotted capsule is to be powdered. |