Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1996-03-11
1999-02-23
Warzel, Mark L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524560, 524561, C08L 2904
Patent
active
058744983
ABSTRACT:
This invention relates to improved vinyl acetate-ethylene emulsions for use in formulating high performance paints without the need for coalescing solvents. These latexes are based on copolymers of vinyl acetate and ethylene optionally containing a comonomer such as an alkyl acrylate or methacrylate. Paints formulated from these latexes, without coalescing solvents, are characterized as having substantially no insolubles, the resin particles in the emulsion are characterized as having a particle size of from 0.2 to 0.35 microns measured as weight average by capillary hydrodynamic fractionation. In other words, the copolymer particles are characterized in that a small percentage, up to about 5% of the total number of particles in the latex, have an average size greater than 0.35 microns, and a small percentage have a size smaller than about 0.2 microns. Further the resin particles are essentially monodisperse. Ethylene in place of the conventional acrylate as the low Tg monomer wit the resulting resin particles having a Tg of from minus -5.degree. to 8.degree. C.
The improved process for producing the emulsion or latex includes as an important component the formation of a seed latex and then polymerizing the monomers in the presence of the seed, the monomers being introduced over a period of time.
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Daniels Christian Leonard
Newman Leon Edward
Air Products and Chemicals Inc.
Brewer Russell L.
Warzel Mark L.
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