| abstract |
Natural clay particles have been encapsulated with a coating of finely divided particles of an urea-formaldehyde polymer which have been formed and polymerized onto the surface of the clay particles. The amount of urea-formaldehyde polymeric particles formed as the coating on the clay particles is from 5 to 96% by weight based on the total weight of the coated product. The clay particles employed possess a size range from 0.1 to 8 Mu . The size of the urea-formaldehyde particles which form the coating on the clay particles are of size from 0.1 to 0.8 Mu . The coated clay particles possess a size range from 0.2 to 10 Mu . |