Specialty Chemicals

ROSKYDAL® K 14 M is a binder for highly filled knifing fillers, putties for marble and stone and adhesives. Because of the high reactivity of ROSKYDAL® K 14 M, fillers based on this product cure fully in a very short time, even when applied in thick coats. They are used in applications requiring hard adhesives and fillers. A particular advantage of ROSKYDAL® K 14 M is the pale colour of the polymer formed. This makes it ideal for use in the formulation of stoppers for marble and stone, especially on pale marble and if early sanding and polishing is required. ROSKYDAL® K 14 M can be combined with other ROSKYDAL® K grades (K 30, K 36, K 45, K 60) to increase their hardness. improves the adhesion to the substrate. The more spherical extenders such as dolomite, chalk and barytes ensure dense packing.

ROSKYDAL® 502 BA is a formulation of clear and pigmented, monomer-free coatings for applying thin finishes to wood and furniture. The coatings can be cured by conventional methods or UV radiation and have good resistance to solvents and other chemicals and yellowing in both light and dark conditions. ROSKYDAL® 502 BA permits the formulation of monomer-free coatings for applying thin finishes to wood and furniture. The application rate should not exceed 100 g/m2. The coatings can be cured by conventional methods or, after addition of photo-initiators, by UV radiation. The resultant films are hard and resistant to scratching, to solvents and other chemicals and to yellowing in both light and dark conditions. The requirements of, for example, DIN 68 861, Group B, are thus satisfied. The drying of the coatings can be accelerated by the addition of nitrocellulose. Inadequate compatibility with cellulose acetobutyrate results in clouding of the film. Coatings based on ROSKYDAL® 502 BA can be applied using conventional methods, e.g. spraying, roller coating or curtain coating. Conventional curing: curing by conventional methods requires the addition of a cobalt accelerator (e.g. cobalt octoate) and peroxide. For curing at room temperature or temperatures up to approx. 60 °C we recommend the use of cyclohexanone peroxide. Tertiary butyl peroctoate should be used at higher curing temperatures because it results in a longer pot life. Even small amounts of styrenewill significantly reduce the pot life of a coating containing cobalt/peroxide.

ROSKYDAL K 12 P is a binder for highly filled knifing fillers and stoppers for marble and stone. Fillers based on ROSKYDAL K 12 P cure fully whether applied in thin or thick coats. They are used in applications requiring hard adhesives and fillers. Formulation Combinations of talc, dolomite/calcite and powdered barytes with low iron content have proved suitable as extenders, with talc as the main component because it improves the adhesion to the substrate. The more spherical extenders such as dolomite, chalk and barytes ensure dense packing.

ROSKYDAL 300/1 is a formulation of clear and pigmented UV-curing top coats with very good flow properties for application by spraying and curtain coating. After the addition of photo-initiators, ROSKYDAL 300/1 can be cured under UV lamps. When using high-pressure mercury vapour lamps with a capacity of 80 - 120 W/cm lamp length, standard commercial initiators can be used. However, their suitability for the intended application should be tested, especially with respect to storage stability, reactivity and yellowing. The use of 2.5 % Irgacure® 17001 or Irgacure 6511 is recommended for clear coats (max. application rate: 250 g/cm2). In the case of top coats, Baysilone® Paint Additive PL2 should be used to promote the flow properties. The addition of 2 % of a 1 % solution in toluene is recommended. Pigmented coatings should be formulated using 2 % Lucirin® TPO1 or other suitable photoinitiators. All the quantities given are calculated on the resin supply form. Clear coats may contain soluble dyestuffs and highly disperse silicas. Primers are formulated using highly disperse silicas and quartz powder. Soluble dyestuffsmay also be added. The addition of 5 - 10 % Desmodur® L or Desmodur N improves the adhesion. However, such combinations have a limited pot life (approx. 24 hours with a 5 % addition of Desmodur L).