Method and device for comminuting a plastic and for producing powdered material from said plastic

A method for comminuting a thermoplastic polymer and for producing therefrom a pulverulent materials with a predefined grain distribution, the method including the following steps:

• predefining a desired grain distribution of the pulverulent material,
• comminuting the thermoplastic polymer, which is provided in lump form, into a starting powder in a comminuting device, wherein the starting powder comprises granules, and
• screening the starting powder at least once until the pulverulent material with the predefined grain distribution has been attained,
• wherein a release agent, is fed into the comminuting device during the comminuting step, wherein the release agent is provided in finely powdered form and wherein the release agent coats the granules of the starting powder in dust-like manner to reduce the tack and capability of the starting powder for agglomeration formation,
• wherein a) the step of comminuting is carried out in a mill comprised by the comminuting device and thereby a cooling agent with a temperature of <−50° C. is fed into the comminuting device, or
• b) the step of comminuting uses a spraying tower, in which the thermoplastic polymer is comminuted by melting or dissolving and then atomizing or spraying via at least one spraying nozzle, wherein a cooling agent with a temperature of <−50° C. is fed into the comminuting device.