Fluidized bed particles having alkaline resistance for coating metal substrates
AssigneeTicona LLC
InventorNicolai Papke
Life of this patent
Estimating the term…
Abstract
Polymer particles containing a polyoxymethylene polymer for coating metallic substrates are described. The polymeric particles contain a polyoxymethylene polymer in combination with a thermoplastic elastomer. The thermoplastic elastomer can include hard segments and soft segments. The soft segments may contain carbonate groups, ether groups, or caprolactone groups. Also disclosed is a process where the polymeric particles are used to form a fluidized bed for coating metallic substrates. In one embodiment, after being coated with the polymer particles, the coated metal substrate is gas cooled followed by cooling the coated substrate in a bath containing an aqueous medium.
Claims18
A powder well suited for powder coating metallic substrates comprising:
- polymeric particles having a particle size distribution such that at least about 80% of the particles have a particle size of from about 30 microns to about 800 microns, the polymeric particles comprising:
- (a) a polyoxymethylene polymer that contains terminal hydroxyl groups in an amount of from about 15 mmol/kg to 200 mmol/kg,
- (b) an impact modifier comprising a thermoplastic elastomer having hard segments and soft segments, the soft segments comprising carbonate groups, ether groups or caprolactone groups;
- and
- optionally a coupling agent for coupling the polyoxymethylene polymer to the impact modifier.
Dependencies are inferred from the claim text.