pigments and dyes in plastics

1
vol. 17, No. 8, Page 15 U.S. 4,663, 380 FIRE RETARDANT POLYCARBONATE Enichem Polimeri SpA Priority Date: 4 September 1984 Comprises 1) polycarbqnate, 2) potassium ferrocyanide or thiocyante and 3) NIN -ethylene bis-tetrabromo phthalimide. U.S. 4,663, 388 PRODUCTION OF FILLED OR REINFORCED POLYMERS A.E. Staley Manufacting Co. Priority Date: 5 August 1985 Process of manufacture described. MARKETS PIGMENTS AND DYES IN The use of dyes in plastics is limited because they generally PLASTICS have poor lightfastness, low levels of heat stability, and a tendency to migrate. Pigments are classified by their chemical nature as being organic or inorganic. Generally, organic pigments are complex chemical compounds that contain one or more benzene structures. Inorganic pigments are usually metallic oxides. Organic pigments tend to have less opacity, but more tinting strength than inorganic pigments. Also, organic pigments tend to produce brighter, cleaner colours than organic pigments. In addition to these colour differences, there are differences in physical properties. Generally, organic pigments tend to have poorer heat stability and lightfastness than inorganic pigments. Also, as a class, organics tend to migrate more than inorganics. However, some organic pigments have very good physical properties, and with careful selection they can be used to colour many plastics. Inorganic pigments accounted for 76 per cent of the total US consumption of colourants in plastics in 1984. Organic pigments accounted for 23 per cent and dyes less than 2 per cent. The inorganic pigment with the highest consumption was titanium dioxide (white). Carbon black accounted for the largest volume, by far, of all organic pigments. Among chromatic pigments, the most important inorganics were iron oxides, cadmiums, chrome yellows, and molybdate oranges. Phthalo blues and greens were the most heavily consumed chromatic organics. B.P. & R., 1987, (June), 12 -- ADDWIVES FOR POLYMERS 01987~vier SciencePublisbers B.V..Amslerdam./871$0.00 + 2.20 No pert of this publication may be reproduced, stored in a retrieval system, or transmitted by any form or by any means, electronic. mechanical, photocopying. recording or otherwise. without the prior permission of the publishers. (Readers in the U.S.A.-please see special regulations listed on back cover.)

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Page 1: Pigments and dyes in plastics

vol. 17, No. 8, Page 15

U.S. 4,663, 380 FIRE RETARDANT POLYCARBONATE Enichem Polimeri SpA Priority Date: 4 September 1984

Comprises 1) polycarbqnate, 2) potassium ferrocyanide or thiocyante and 3) NIN -ethylene bis-tetrabromo phthalimide.

U.S. 4,663, 388 PRODUCTION OF FILLED OR REINFORCED POLYMERS A.E. Staley Manufacting Co. Priority Date: 5 August 1985

Process of manufacture described.

MARKETS

PIGMENTS AND DYES IN The use of dyes in plastics is limited because they generally PLASTICS have poor lightfastness, low levels of heat stability, and

a tendency to migrate. Pigments are classified by their chemical nature as being organic or inorganic. Generally, organic pigments are complex chemical compounds that contain one or more benzene structures. Inorganic pigments are usually metallic oxides. Organic pigments tend to have less opacity, but more tinting strength than inorganic pigments. Also, organic pigments tend to produce brighter, cleaner colours than organic pigments. In addition to these colour differences, there are differences in physical properties. Generally, organic pigments tend to have poorer heat stability and lightfastness than inorganic pigments. Also, as a class, organics tend to migrate more than inorganics. However, some organic pigments have very good physical properties, and with careful selection they can be used to colour many plastics. Inorganic pigments accounted for 76 per cent of the total US consumption of colourants in plastics in 1984. Organic pigments accounted for 23 per cent and dyes less than 2 per cent. The inorganic pigment with the highest consumption was titanium dioxide (white). Carbon black accounted for the largest volume, by far, of all organic pigments. Among chromatic pigments, the most important inorganics were iron oxides, cadmiums, chrome yellows, and molybdate oranges. Phthalo blues and greens were the most heavily consumed chromatic organics.

B.P. & R., 1987, (June), 12 --

ADDWIVES FOR POLYMERS

01987~vier SciencePublisbers B.V..Amslerdam./871$0.00 + 2.20 No pert of this publication may be reproduced, stored in a retrieval system, or transmitted by any form or by any means, electronic. mechanical, photocopying. recording or otherwise. without the prior permission of the publishers. (Readers in the U.S.A.-please see special regulations listed on back cover.)