Matting agent

Miscellaneous additives, defoamers, matting agents 0-3 Affect processing behavior and appearance of finished film... 

By this time, we had found that the addition of matting agents, such as silica, would improve the tooth of the paper—i.e., it would accept ink or pencil writing. We soon realized that we had lucked out, and had put together a new product that filled a market need. Had all these requirements been presented to us before we started our research, we would probably not have succeeded with so complex a task. A triumph for pragmatism From this point, technology advances were primarily in coating as reported in the cited references. 

Special considerations filler porosity is important consideration in silica matting agents some silica matting agents affect thixotropy of alkyd paints... 

Lumattin . [BASF AG] Wax-modified silica matting agents for paints and varnishes. 

Optics Matting agents, spacers, refractive index modifiers. Silica, blanc fixe, ultrafine Ti02, polymer beads... 

In order to take further account of this trend, Degussa-Huls has begun to develop a new generation of matting agents. In this presentation the creation of these new, uncoated products and their application properties are described. 

The first manufacturing method is the thermal process (Figure la). Currently, ACEMATT TS 100 is the only matting agent available in this range. Fumed silicas differ from precipitated silicas and silica gels in three major characteristics ... 

Two new untreated ACEMATT grades were developed through targeted variation and optimisation and a consistent technical implementation of the above-mentioned parameters. The physical and chemical properties of these two matting agents are listed in comparison to ACEMATT TS 100 in Table 1 (Figure 4). 

In the following segment, the application properties of these new matting agents will be compared to other significant, three available matting agents. 

Since mainly fine particle matting agents are required for furniture coatings, ACEMATT 460 should be mentioned in this regard. To stress once more the specific differences mentioned at the start. Table 2 with comparisons between the physical and... 

To differentiate between the matting efficiency of the matting agents, a formulation was deliberately selected which is not particularly practice oriented, but which provides us with very dissimilar and reproducible results due to its composition, and thus shows the differences in efficiency of the matting agents (Table 3). 

However, it is not just transparency and matting efficiency that are important for the appearance and the surface quality of furniture coatings, the chemical resistance must also not be disregarded. Household chemicals were tested in accordance with DIN 68861 Part 1 B. Here too, ACEMATT HK 460 produced some very good results in comparison to other non-coated matting agents (Table 4). For comparison reasons the surface treated ACEMATT OK 520 was included. 

T able 4 Chemical resistance of various matting agents (formulation of Table 3)... 

Matting acid, sulphuric acid when used as a matting agent. Matting is the process by which metals and other substrates have their surface sheen removed to leave a dull, lustreless finish. It can also be used to describe the use of sulphuric acid as an etchant. 

---