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Selecting the proper process aid for the application
Author(s) -
Kitai Kiyokazu,
Holsopple Peggy,
Okano Kenji
Publication year - 1992
Publication title -
journal of vinyl technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 0193-7197
DOI - 10.1002/vnl.730140410
Subject(s) - process (computing) , viscosity , process engineering , range (aeronautics) , value (mathematics) , computer science , manufacturing engineering , mechanical engineering , biochemical engineering , materials science , nanotechnology , engineering , composite material , machine learning , operating system
With the advent of new and demanding applications such as foam core pipe and coextruded siding and profile, coupled with the demand for more highly efficient cost/performance products in older PVC applications resulting from the desire to increase output, and with the push towards recycling, there is a strong need for efficient and effective processing aids. Process aids have been used for many years to improve the appearance and properties of PVC. In the past they were limited to low and high molecular weight products (0.3 to 0.5 reduced viscosity value), lubricating type acrylics, and some lower‐efficiency styrenics. This paper will describe a much broader range of process aids that are designed to fit the requirements of specific formulation and processing techniques. Rather than force fitting the few older processing aids into all applications, the PVC processor now has the luxury of optimizing his formulation by choosing from a wide molecular weight range of products (0.1 to 0.9 reduced viscosity value). The different structures and molecular weights of currently commercial process aids are discussed, as well as their “fit” in today's formulations.