Inherent Matt Waterborne Polyurethanes
Besides well-known and excellent properties of the waterborne PU, a coating thereof has particularly important optical properties. In general, a matting coating can be obtained by adding an extra matting agent. However, an disadvantage of matting agents is failure to form a continuous film and along with poor transparency of the coating film; moreover, matting agents are not fixed firmly because of incompatibility thereof with organic polymer components in a coating; therefore, these matting agents can flake off the coating relatively easily, so that surface finish increases over time and an ideal matting effect is lost gradually. In addition, addition of an extra matting agent shows some disadvantages during use in a waterborne coating system, such as thickening, sedimentation, agglomeration, decreased physical properties of the coating film, heterogeneous surface photoeffect of a material.
The inherent waterborne polyurethane coatings have soft touch, excellent matting performance, excellent light fastness, abrasion resistance, hydrolysis resistance and high physical properties.
The following are a few of our most common inherent matt waterborne polyurethane products:
Soft feel, inherent matting, aliphatic aqueous polyurethane dispersion based on polyether and polyester. Gloss levels down to approximately 0.5 at 60º can be achieved. It also, in combination with other water-dilutable resins or additives, results in out-standing print performance with enhanced soft feel properties.
Inherent matt, aliphatic polyurethane dispersion based on polycarbonate. It has good matting performance with gloss levels down to 0.6 at 60º. Its coating has high hardness, and better wear resistance. It has excellent resistance to weather, xenon lamp and hydrolysis.
Inherent matt, aliphatic polyurethane dispersion based on polycarbonate. Its coating hardness is higher than that of SiwoPUD®-MATT-1910.