ISSN: 1546-962X
CODEN: JAIOAD
Published Online: 8 June 2005
Page Count: 14

New Value-Added Polymeric Dispersants and Uses Thereof in Agricultural Formulations

Narayanan, KS
Science Fellow/Director, Senior Research Chemist, and Research Chemist, Performance Chemicals, International Specialty Products, Wayne, NJ

Jon, DI
Science Fellow/Director, Senior Research Chemist, and Research Chemist, Performance Chemicals, International Specialty Products, Wayne, NJ

Patel, J
Science Fellow/Director, Senior Research Chemist, and Research Chemist, Performance Chemicals, International Specialty Products, Wayne, NJ

(Received 2 October 2003; accepted 2 November 2004)

Abstract

Polymeric dispersants are dispersants of choice for formulating suspension concentrates, suspoemulsions, and solid delivery systems (WP, WDG, and Tablets). We have developed a new line of polymeric dispersants, as 25 % aqueous solution, based on partially neutralized methyl vinyl ether maleic acid half esters (ethyl/butyl) copolymers (MVE-MAHE), (with trade name EASY-SPERSE®). They were used in formulating suspension concentrates and aqueous dispersions for a host of active ingredients like herbicides, insecticides, fungicides, and other growth regulators, organic dyes, inorganic pigments, including certain water-insoluble polymers. Some of these dispersions also showed suspensibility above 80 % and rainfastness at use level concentrations.

Other commonly used polymeric dispersants are: Lignosulfonates, Naphthalene sulfonate formaldehyde condensate (NSFC), Poly acrylates, and olefin maleic acid co-polymers. Their film forming properties and binding efficacy can be improved when used with pyrrolidone co-polymers.

Our recent findings show synergy between vinylpyrrolidone homo/co-polymers and commonly used polymeric dispersants as above. Further, a combination of Polyvinylpyrrolidone and polymeric dispersants showed built-in rainfastness in suspension concentrates. Examples of prototype formulations and a working model explaining the synergistic role of polyvinylpyrrolidone are provided. Solid composites from Polyvinylpyrrolidone and MVE-MAHE were prepared via spray drying the liquid slurries. The solid dispersants with Polyvinylpyrrolidone incorporated will be useful in formulating solid delivery systems.

Keywords:
EASY-SPERSE®, MVE-MAHE, dispersants, suspension concentrates, lignosulfonates, naphthalene-sulfonate-formaldehyde-condensate (NSFC), Polyvinylpyrrolidone (PVP K - 30), synergy, chlorothalonil, carbaryl, Atrazine, metaldehyde, suspensibility, rain-fastness, solid composites (PVP/MVE-MAHE)

Paper ID: JAI12180
DOI: 10.1520/JAI12180
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