The SPE Library contains thousands of papers, presentations, journal briefs and recorded webinars from the best minds in the Plastics Industry. Spanning almost two decades, this collection of published research and development work in polymer science and plastics technology is a wealth of knowledge and information for anyone involved in plastics.
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Masumi Mizu | Taro Mitsudera | Tadashi Sengoku | Kiyotatsu Iwanami | Toshinori Yukino | Hiroshi Nishimura | Robert G. Weiler, September 2010
The purpose of this paper is to describe the development of a new class of Calcium/Zinc heat
stabilizer for clear rigid PVC applications. Typically, until this time, Organo-Tin based heat stabilizers
have been used for this application. Organo-Tin heat stabilizers offer excellent transparency and good
heat stability protection. Recently, Butyl-Tin based heat stabilizers have been designated as an
environmental Substance of Very High Concern (SVHC) in EU. This has led us to research and
develop alternative heat stabilizers for clear rigid PVC applications.
Liquid Barium/Zinc based heat stabilizers offer good transparency but they typically do not have
enough heat stability under rigid PVC processing conditions. They also have the environmental
problem of the heavy metal, Barium. Typical Calcium/Zn stabilizers have good heat stability, and are
environmentally more acceptable, but typically are deficient in transparency.
Our purpose in this paper is to describe a technique for selecting individual components for a high
transparency powder Calcium/Zinc heat stabilizer and to demonstrate that the transparency and heat
stability are suitable for the task of protecting clear rigid PVC applications. Three important technical
points necessary for improving transparency were described. First is refraction (Refractive index).
Second is scattering (particle size). And third is dispersion (compatibility). Ideal state satisfied these
three points.
Ken Walker | Alex Isarov | Tong Chen, September 2010
Viability of continued use of antimony oxide is among the topics of broad interest to PVC compound
suppliers as well as their end users. Existing and emerging regulatory mandates have continued to drive
an industry-wide effort to minimize use of antimony oxide in PVC, while being able to maintain adequate
fire performance when formulating the low-smoke compounds for a variety of applications such as
construction materials and wire and cable products.
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How to reference articles from the SPE Library:
Any article that is cited in another manuscript or other work is required to use the correct reference style. Below is an example of the reference style for SPE articles:
Brown, H. L. and Jones, D. H. 2016, May.
"Insert title of paper here in quotes,"
ANTEC 2016 - Indianapolis, Indiana, USA May 23-25, 2016. [On-line].
Society of Plastics Engineers, ISBN: 123-0-1234567-8-9, pp. 000-000.
Available: www.4spe.org.
Note: if there are more than three authors you may use the first author's name and et al. EG Brown, H. L. et al.
