Patent ID: 6428843
Filing Date: 2002-08-06
Classification: B29B,C08J,C09D,Y02W

Abstract:
A process for recycling polymeric powder coating wastes comprising the steps of:a) intimately contacting the powder coating wastes with polymeric powder coating chips to form powder coating chips that are at least partially covered with the powder coating wastes; wherein the powder coating wastes and the powder coating chips have essentially the same composition and the powder coating chips have a particle size of 0.5 to 2 cm and the powder coating wastes have a particle size of 1 to 100 &mgr;m and the weight ratio of powder coating wastes to powder coating chips is in the range of 1:2 to 1:50 and wherein the powder coating wastes are applied to a surface thickness of up to 5 mm to the powder coating chips: and b) bonding the powder coating wastes to the powder coating chips by heating the waste covered powder coating chips prepared in step a) to a temperature range within the glass transition temperature range to below the melting temperature range without exceeding the melting temperature range and maintaining that temperature range until a firm bond between the powder coating wastes and the powder coating chips is obtained.