In order for Tylose® to realise its numerous advantageous properties, it must be dissolved in a solvent. Depending on the type and degree of etherification, Tylose is soluble in a number of solvents and in a wide temperature range, so that we are able to offer individual and tailor-made solutions to our customers.
The solubility of Tylose in a given solvent depends on
A characteristic property of the methyl cellulose (MC) and cellulose ethers with mixed etherification (MHEC and MHPC) is that they flocculate and coagulate when heated. Below the so-called flocculation or coagulation temperature, Tylose is totally soluble in water. The maximum soluble amount of Tylose is only restricted by the fact that the resulting “solution” becomes turbid and with an increasing amount of Tylose turns into a rigid gel. For this reason, the solubility of cellulose ethers is characterized in form of the temperature at which the cellulose ether flocculates or coagulates.
In aqueous systems pure methyl cellulose flocculates at temperatures between 45°C and 60°C. Due to mixed etherification (MHEC, MHPC) it is possible to shift the flocculation point to higher temperatures. For example, highly mixed etherified Tylose MHEC and Tylose MHPC types flocculate from their aqueous solutions at temperatures between 65°C and 85°C. In the case of more highly concentrated solutions, a thermo gel forms instead of thermo coagulation. Both phenomena, thermo coagulation and thermo gel formation are reversible. During the cooling process, the methyl cellulose redissolves. Tylose H remains a clear solution even when the temperature is considerably raised. Normally, neither thermo coagulation nor thermo gel formation occur with Tylose H-types.
