05-07-2018 дата публикации
Номер: US20180186941A1
Принадлежит:
The present invention relates generally to methods of preparing vinylidene chloride polymer compositions. In one embodiment, a method of preparing a vinylidene chloride polymer composition comprises (a) adding a first dispersion comprising a wax, a polyolefin or a combination thereof to an aqueous dispersion comprising vinylidene chloride polymer particles; (b) adding an acrylic polymer latex to the aqueous dispersion; and (c) coagulating the wax, the polyolefin, or the combination of the wax and polyolefin, and the acrylic polymer on the surface of the polymer particles. 1. A method of preparing a vinylidene chloride polymer composition , the method comprising:(a) adding a first dispersion comprising a wax, a polyolefin or a combination thereof to an aqueous dispersion comprising vinylidene chloride polymer particles;(b) adding an acrylic polymer latex to the aqueous dispersion; and(c) coagulating the wax, the polyolefin, or the combination of the wax and polyolefin, and the acrylic polymer on the surface of the polymer particles.2. The method of claim 1 , wherein the first dispersion comprises an anionic surfactant.3. The method of claim 1 , wherein the first dispersion comprises a nonionic surfactant.4. The method of claim 1 , further comprising adding a second dispersion comprising a wax claim 1 , a polyolefin or a combination thereof to the aqueous dispersion.5. The method of claim 1 , wherein the second dispersion comprises an anionic surfactant.6. The method of claim 1 , wherein the second dispersion comprises a nonionic surfactant.7. The method of claim 1 , wherein the coagulating step comprises adding a chemical coagulant to the aqueous dispersion comprising the latex and the wax claim 1 , the polyolefin claim 1 , or the combination of the wax and polyolefin.8. The method of claim 1 , wherein the chemical coagulant comprises an inorganic salt of a metallic ion.9. The method of claim 1 , wherein the coagulation temperature is from 60° C. to 120° C. claim 1 , ...
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