Process for the short-time treatment of a plastic melt with a liquid treatment agent and the plastic thus produced

A process for the treatment of a plastic melt with a liquid treatment agent which comprises:

• treating a plastic melt with a liquid treatment agent at a pressure and a temperature at which said treatment agent is in a liquid state,
• expanding and degassing said mixture at a reduced pressure;
• wherein said plastic melt is divided into defined individual subquantities, and said individual subquantities are brought into contact with said treatment agent,
• said individual subquantities are combined after a residence time of less than one second, with portions of a minimum of one other said subquantity,
• wherein said steps of dividing and combining said plastic melt are repeated a plurality of times at intervals less than one second or until an intimate mixture consisting of said plastic melt and said treatment agent is obtained, and, wherein said plastic melt is comprised of a (meth)acrylic ester homopolymer or a copolymer of (meth)acrylic acid ester with a monomer selected from the group consisting of styrene, substituted styrene, maleic anhydride, itaconic anhydride and mixtures thereof, and wherein said treatment agent is an amine, ammonia or a mixture thereof.