Vol. 18, No. 10, Page 3

ting of fibres predominantly parallel to the direction of flow, and the middle "core" where the velocity is almost constant and where the majority of the fibres are aligned perpendicular to the flow direction. The higher the fibre volume content, the more pronounced this orientation behaviour appears to be.

Plast. Eng., 1988, XLIV, (May), 81

PHOTOSTABILIZING The Manzoura University, in Egypt, has studied the photostabili- EFFECT OF zation of polychloroprene in the presence of four derivatives 5-HYDROXY-3-PHRNYL- of 5-hydroxy-3-phenylamino-l-phenyl-3:5_dihyd~obenzene. These

~INO-l-PH~-3:5- amino compounds were obtained via the reaction between 5-phenyl- DIHYDROBENZENE 2,5_dihydrobenzene and aliphatic or aromatic amines. Their selec-

DERIVATIVES IN tion was based on the fact that these compounds possess a high POLYCHLOROPRENE extinction coefficient in the UV region.

J. Poly. Sci., Part A, 1988, 3, 2359-2367

INTUMRSCRNT FIRE RETARDANTS IN FOLYCARRONATES

lntumescent fire retardants based upon aromatic sulphonates have been found capable of inducing self-extinguishing properties on polycarbonates even at low concentrations (0.2-1.0%). The plott- ing of polymer surface temperature against time, measured under forced flame conditions, showed that the expanded carbon layer formed in the combustion of polycarbonate-aromatic sulphonate blends produced a heat insulating effect towards the undecom- posed bulk, and is therefore intumescent in nature.

J. Poly. Sci., Part A, 1988, 3, 2113-2127

IMPACT MODIFIER The addition of small amounts of ethylene ethylacrylate (EEA) FOR INJECTION MOULDED to PBT and nylon 6 produces considerable improvements in the im- PBT AND NYLON pact properties. The addition of 10% showed a gain of some 2& CORNETS times and 20% resulted in a gain of 4 times the normal. There

is a similar chemical structure between PBT and EEA.

Plast. Eng., 1988, XLIV, (Apr.), 47-9

CONDUCTIVE PLASTICS

The demand for plastics with a high level of conductivity stead- ily increases as a result of growth in the sensitive electronic components market where protection against static discharge (ESDI and electrical interference (EMI) is required. When conductive fillers are used in an inherently non-conductive polymer, it is important to optimize the shape of the fibres in terms of aspect ratio and the method by which such materials are compounded in order to maximize the resultant level of conductivity. Overlapp- ing fibres impart conductivity to the plastics. They form a net- work throughout the polymer that conducts the electricity. Fibres

Cont./......

ADDITIVES FOR er 1Sea Elaevicr!kien*e Publisher8 Ltd.. Englmd.~~ESO.tMt + 2.20

POLYMERS No part of this publication may be reproduced, stored in a retrieval system, or transmitted by anv form or bv any means, electronic, mechanical, photocopyjn~, recording or otherwise, without the prior perrnissj~)o of the publishers (Readers in the U.S.A. - please see special regulations listed on back cover.)