| abstract |
The present invention relates to optionally foamed sealing compositions for preformed seals that can swell in water treatment. The present invention further relates to a process for producing a sealing composition from natural rubber and / or elastomer having a matrix composed of natural rubber / elastomer components and particulate water absorbent material stored in the matrix. Absorbents include: A) starch derivatives except cellulose, starch, grafted starch, amylose, amylopectin, dextran, pectin, insulin, chitin, xanthan, alginic acid, aglynate, carrageenan, fusturlan, carrose (B) (meth) acrylates, poly (meth) acrylic acids and salts thereof, polyacrylamides, polyalcohols or copolymers thereof, and polysaccharide (s) selected from laminarin, gluronic acid, pullulan, lycanine or mixtures thereof Is a mixture of water-superabsorbent synthetic polymers selected from polymers based on a. The invention also relates to additive crosslinkers and processing aids and property improving agents. The sealing composition of the present invention can be used to securely seal the superstructures, substructures, tunnels and waterways. |