Multiple phase polymeric vinyl chloride systems and related core-shell particles
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United States of America Patent
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Nov 13, 2001
Grant Date -
N/A
app pub date -
Apr 7, 1999
filing date -
Apr 7, 1999
priority date (Note) -
Expired
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Abstract
An emulsion or suspension polymer comprising a vinyl chloride polymeric core and an acrylic ester-acrylonitrile polymeric shell is disclosed. The emulsion polymer is preferably prepared using a two-stage process. In the first stage, a vinyl chloride monomer is polymerized or copolymerized to form a first phase of a polymeric hard core having a relatively high chlorine content. In a second stage, the soft acrylic ester--acrylonitrile copolymer is made in situ in a reaction mixture comprising the first phase. The product provides both flame retardancy and low MFFT, and is useful in a variety of coating and binding applications.
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