LUMINESCENCE CONCENTRATE FOR DYEING POLYETHYLENE AND METHOD OF ITS PRODUCTION Russian patent published in 1994 - IPC

FIELD: luminescence dying of polyethylene. SUBSTANCE: concentrate contains high pressure polyethylene ( 53.37-58.37% ), liquid paraffin for producing protein-vitamin concentrate (4.73-10.24% ), fluorescence pigment ( 34.58-36.45% ) and absorber of formaldehyde-ammonia salt (0.69-2.28% ). Mentioned above pigment is prepared on the base of melamine-toluene-sulfamide-formaldehyde or melamine-areatoluene-sulfamide-formaldehyde polymer and luminescence component. Method of producing concentrate involves feeding into mixer granulated high pressure polyethylene and fluorescence pigment as pieces 2-120 mm in size and mixing at ambient temperature till particles of pigment are 0.5-1.0 mm in size. Into thus prepared mass liquid paraffin is added and mixture is ground within 0.5-2 h. Then absorber of formaldehyde is added by heating and grinding is carried out at 120-145 C within 1.5-2.5 h. EFFECT: improves desired product quality. 3 cl, 5 tbl