Abstract:
The invention relates to an aqueous resin composition, comprising, in addition to water, a resin content in the range of from 65 to 80 % by weight, based on the aqueous resin composition. The resin is obtainable from melamine and formaldehyde and optionally at least one additive, and the aqueous resin composition has a viscosity ranging from 100 to 3000 mPas at 20 DEG C. The invention further relates to a method for producing the resin composition, to a composite containing said composition, to an impregnating resin dispersion, and to a method for producing the same. The invention also relates to the storage and use of said resin composition and impregnating resin dispersion.
Abstract:
Aqueous resin compositions (I) with a viscosity of 100-3000 mPa.s at 20 deg C, containing 65-80 wt% of a resin obtained from melamine (M), formaldehyde (F) and optional additive(s). Independent claims are also included for (a) a process for the production of (I) by mixing the above starting materials in an aqueous condensation phase, heating until the phase is transparent and then removing water until the product has the required resin content and viscosity; (b) composites containing (I) after thermal treatment, plus a carrier material; (c) a process for the production of these composites by bringing (I) and the carrier material into contact with one another at 60-300 deg C; (d) composites obtained by process (c); (e) a process for the production of a stable impregnating resin dispersion by dispersing (I) with small particles.