Patent ID: 6833434
Filing Date: 2004-12-21
Classification: C08J,C08K,C08L,Y02W

Abstract:
Noctilucent polyurethane chips prepared by the process comprising:collecting waste polyurethane scraps and separating the scraps according to their colors; pulverizing the waste polyurethane scraps in a predetermined size; mixing 2-5 kg of stearic acid, 1-10 kg of a photoluminescent pigment, 1-3 kg of a flame retardant, 0.1-1 kg of titanium dioxide and 10-30 kg of heavy calcium carbonate based on 100 kg of the pulverized waste polyurethane scraps; extruding the mixture through an extruder; and cutting the extruded polyurethane in particle diameter of 3-10 mm.