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US 7,022,747 B2Granted
Method for creating microsphere polymers and particles
AssigneeBASF SE
InventorsThaddeus J. Lepkowski, Craig S. Schang, Walter H. Ohrbom
Life of this patent
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Abstract
A polymeric material is produced by atomizing into droplets a composition containing addition-polymerizable material and reacting the addition polymerizable material in the droplets to produce the particulate product. The polymeric product may be, for example, a powder coating composition.
Claims9
A method of making a slurry of a particulate polymeric material, comprising steps of:
- atomizing into droplets a composition comprising addition-polymerizable material and a crosslinking agent, where the crosslinking agent is selected from the group consisting of aminoplast crosslinking agents, isocyanate crosslinking agents, and combinations thereof;
- addition polymerizing the addition-polymerizable material in the droplets to produce the particulate polymeric material reactive with the crosslinking agent;
- and
- collecting the particulate polymeric material in an aqueous medium to form an aqueous slurry of the particulate polymeric material.
1 more element
A method of preparing a coating composition, comprising
- atomizing into droplets a composition containing addition-polymerizable material and a crosslinking agent, where the crosslinking agent is selected from the group consisting of aminoplast crosslinking agents, isocyanate crosslinking agents, and combinations thereof,
- reacting the addition polymerizable material in the droplets to produce a particulate product reactive with the crosslinking agent, and
- incorporating the particulate product into a liquid coating composition, wherein the particulate product behaves as an associative thickener or as a rheology control agent in the liquid coating composition.
A method of preparing a powder coating composition, comprising
- preparing a composition containing addition-polymerizable material, a crosslinking agent, and pigment, wherein the crosslinking agent is selected from the group consisting of aminoplast crosslinking agents, isocyanate crosslinking agents, and combinations thereof;
- atomizing into droplets the composition;
- and
- reacting the addition polymerizable material in the droplets to produce a powder coating composition comprising an addition polymer reactive with the crosslinking agent, and the pigment.
1 more element
Dependencies are inferred from the claim text.