April 1992 Additives for Polymers

For further information, contact: strew ~~~~, ~e~e~rc~ Director, Applied Market Information Ltd., AMI House, 45-47 Stokes Croy?, Bristol, BSI 3QP, (UK). Tel: +44-272-241598.

Stabiliition of PVC

US 5,063,261

US 5,063,262

US 5,063,263

This survey article on PVC stabilizers describes how, in West Germany, the changeover to cadmium-free systems is currently being carried out in the sectors of window profile and sheet extrusion as well as in c~ende~ng of roofing sheet and film where the use of cadmium based stabilizers has so far been common practice. Over the medium term, an extensive replacement of lead based stabilizers too is to be expected. Currently all producers of stabilizers are intensively engaged in the new and further development of lead and cadmium-free stabilizers for PVC. More experience over the long term is yet required for a quality-assured changeover to lead and cadmium- free systems, particularly for PVC applications with a long service life.

Kunststojfe Europe, 1991, (Dee), 368-371

PATENTS

SIZE FOR CARBON AND GLASS FIBRES BASF Priority Date: 21 April 1989

Size is an aqueous dispersion of epoxy resin and an emulsifier.

POLYMERIC CO-STABILIZER FOR PVC Huels Priority Date: 26 September 1989

Primary stabilizer is a zinc compound and a polyoxazoline com~und.

STABILIZER FOR POLYACETALS Du Pont Priority Date: 11 June 1990

Contains a non-meltable polymer stabilizer which is improved with a minor amount of at least one meltable co-stabilizer and a primary antioxidant.

el992 Elsevier Science Publishers Ltd. 11