Flame retardant latexes

Chemistry of carbon compounds – Miscellaneous organic carbon compounds

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260 297W, 260DIG24, C09D 374, C09D 376, C09D 502, C09D 518

Patent

active

042280583

ABSTRACT:
Flame retardant latex bases having an excellent balance of properties are prepared most efficiently and economically by blending together two separately polymerized latexes of different types, the polymeric content of one of said latexes being formed predominantly from a monomer mixture consisting of from about 70 to about 92% by weight vinylidene chloride and 8 to 30% by weight of certain polar comonomers principally of the lower alkyl acrylate class while the polymeric content of the second latex is formed from a monomer mixture consisting predominantly of styrene and butadiene. This technique of producing the desired flame retardant latex bases by combining two separately prepared but simpler component latexes not only maximizes quality control and manufacturing flexibility but also permits the simultaneous realization of higher conversions and reduced polymerization cycles or residence times so that productivity is also maximized.
Provided the solids contents of the two separately polymerized latexes are fairly close to each other (i.e. somewhere near the usual range of about 40 to 50% by weight), then latex bases of commercial interest can be formed by blending the vinylidene chloride copolymer latex with from about 1/9th to about 4 times its weight of the styrene-butadiene latex so that vinylidene chloride represents from about 20 to 80% by weight of the total polymer content of the resultant blend.

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