Additives for Polymers July 1991

Exxon acquires ComAllo3;

Degradable Nlaterials: perspectives, issues, and opportunities

Foams and blowing agents review report

PS-02052 costs only loo/o more.

The cost factor for deeper Plastisperse blacks is proportionate. Paste dispersions, however, can cost several hundred percent more to achieve similar results.

Additionally, because Plastisperse is a free flowing, low dusting, dry colourant with a low carrier vehicle content, other ~~~~t benefits are achieved. There is, for example, a minimal effect on physical properties. It can be difficult and expensive to achieve deeper blacks with paste dispersions because much higher quantities of carrier vehicle can adversely affect product quality. For example, 75% of the weight of standard carbon black dispersions is carrier vehicle.

More information and testing specifications are available from: Jim Ogren, Plusticolors Inc., 2600 Michigan Avenue, P.O. Box 816, Ashta~u~, chin 44~~4, (USA). Tel: +1-21~-997-5137.

COMPANY NEWS

Exxon Chemical Co., Houston, has acquired ComAlloy International Corp. of Nashville, Tenn., a producer of reinforced thermoplastics compounds and alloys. ComAlloy will operate under its current name as an Exxon affiliate.

BOOKS/PUBLICATIONS

This is the title of,a book by S. A. Barenberg et al, ~nsist~g of the proceedings from the First International Scientific Concensus Workshop on Degradable Materials. Areas covered include biodegradation in live applications, characterization techniques and methodology, photochemical degradation, and secondary effects of degradation. Tables and charts are included. Available corn: CRC Press Inc., Boca Raton, EGA, (USA) priced $89.95.

RAPKA Technology Limited in the UK has produced a state-of- the-art review on foams and foam generation methods. Dr. J. M. Methven, lecturer at UMIST on polymer processing and composite analysis, is the author of this report which details the technical aspects of the manufacture of foam materials.

Casting, moulding, RIM and cont~uo~ processes are described with specific data given on blowing agents, dispensing and mixing procedures and curing reactions. The CFC question is addressed and alternative blowing agent technologies are

14 01991 Elsevier Science Publishers Ltd.