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Light stabilisation of polymers
Vol. 17, No. 8, Page 3 Caticnic-active compounds with imidazole as quaternary group have ANTIELECTROSTATIC PROPERTIES OF l-ALKYL- antielectrostatic properties. Measurements of the surface 3-ALKOXYMETHYLIMIDAZO- resistance of the discharge time and the maximum electrostatic CHLORIDES charging of 1-alkyl-+alkoxymethylimidazolium chlorides applied on the surface of LDPE films as antistatic agents demonstrate the excellent antielectrostatic properties of these materials. Kunst., 1987,
LIGHT STABILISATION OF POLYMERS
7J,
(May), 517-8
This article covers stabilization of MD1 polyether and polyester, thermoplastic, carbon-black-pigmented,and aliphatic types against UV as well as nitrous oxides common in warehouses. Selection of the appropriate UV absorbers based on the urethane composition, can allow the use of polyurethanes in new applicational areas in the automotive, business machines, and other sectors. The peroxide concentration of the starting polyol can dramatically influence initial colour and phosphites can influence both the initial colour and the resistance to discolouration. The weatherability of carbon black pigmented polyurethanes can be improved by the addition of selective UV absorbers. Plast. Compound., 1987, 10, (May/June) 13-27
REDUCING DISCOLOURATION IN WHITE FOAMS
The problem of yellowish white foams made with azodicarbonamide (ADC) blowing agents can be eliminated at low cost, says Uniroyal Chemical Co., Middlebury, Conn. The discolouration comes from the residue of unreacted ADC, Processors have been solving the problem with masking techniques, such as TiO (expensive) or optical brighteners (hard to control). A bezter answer say Uniroyal is to leave less residue by using an activator to help the ADC react fully. Zinc oxide is an effective, low-cost activator (using the finest particle size). Uniroyal offers several "activated" grades of ADC but processors can add the ZnO themselves but proper loading depends greatly on the formulation and process. Plast World, 1987, 45, (March), 73
EFFECT OF CARBON BLACK The degree of carbon black dispersion strongly influences the CHARACTERISTICS IN physical properties of black rubber articles, while the rate at RUBBER/CARBON MIXING which carbon black incorporates and disperses controls the economics of the mixing process. The mixing of carbon black with rubber is a complex process and it cannot be characterized by any single parameter. The effect of the morphology of carbon black, its reactivity towards the polymer matrix, and the viscosity of the polymer on the rates of incorporation and dispersion were determined in tests carried out by Cabot Corporation in the US
Jlhvier Scim~~ Publisbms B.V., AmsterdamJ876O.OO + 2.20 No part of this publication may be reproduced. stored in e retrieval system, or transmitted by any form or by any means, elechunic, 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.)
o 1987
AmlTIvIs m&meR$
COR
LIGHT STABILISATION OF POLYMERS
7J,
(May), 517-8
This article covers stabilization of MD1 polyether and polyester, thermoplastic, carbon-black-pigmented,and aliphatic types against UV as well as nitrous oxides common in warehouses. Selection of the appropriate UV absorbers based on the urethane composition, can allow the use of polyurethanes in new applicational areas in the automotive, business machines, and other sectors. The peroxide concentration of the starting polyol can dramatically influence initial colour and phosphites can influence both the initial colour and the resistance to discolouration. The weatherability of carbon black pigmented polyurethanes can be improved by the addition of selective UV absorbers. Plast. Compound., 1987, 10, (May/June) 13-27
REDUCING DISCOLOURATION IN WHITE FOAMS
The problem of yellowish white foams made with azodicarbonamide (ADC) blowing agents can be eliminated at low cost, says Uniroyal Chemical Co., Middlebury, Conn. The discolouration comes from the residue of unreacted ADC, Processors have been solving the problem with masking techniques, such as TiO (expensive) or optical brighteners (hard to control). A bezter answer say Uniroyal is to leave less residue by using an activator to help the ADC react fully. Zinc oxide is an effective, low-cost activator (using the finest particle size). Uniroyal offers several "activated" grades of ADC but processors can add the ZnO themselves but proper loading depends greatly on the formulation and process. Plast World, 1987, 45, (March), 73
EFFECT OF CARBON BLACK The degree of carbon black dispersion strongly influences the CHARACTERISTICS IN physical properties of black rubber articles, while the rate at RUBBER/CARBON MIXING which carbon black incorporates and disperses controls the economics of the mixing process. The mixing of carbon black with rubber is a complex process and it cannot be characterized by any single parameter. The effect of the morphology of carbon black, its reactivity towards the polymer matrix, and the viscosity of the polymer on the rates of incorporation and dispersion were determined in tests carried out by Cabot Corporation in the US
Jlhvier Scim~~ Publisbms B.V., AmsterdamJ876O.OO + 2.20 No part of this publication may be reproduced. stored in e retrieval system, or transmitted by any form or by any means, elechunic, 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.)
o 1987
AmlTIvIs m&meR$
COR