Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1975-02-11
1977-11-15
Wong, Jr., Harry
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
20415922, 260 793MU, 4242484, 424256, 424269, 424274, 526213, 526218, 526227, 526230, 526260, 526263, 526264, C08F22020, C08F 2600
Patent
active
040584917
ABSTRACT:
Novel cationic hydrogels, containing basic (cationic) groups in their molecular structure, and processes for their preparation are described. These novel hydrogels are stable, three-dimensional polymer networks, having good water permeability and mechanical properties. They are obtained by simultaneous polymerization and cross-linking in the presence of a polymerization catalyst, such as an organic peroxide, azobisisobutyronitrile or other free radical polymerization catalyst, of a mixture of (a) a heterocyclic monomer preferably an N-vinyl lactam, (b) a cationic monomer -- usually an ester of acrylic or methacrylic acid with an amino alcohol, the terminal amino group of which may be quaternized, such as dimethylaminoethyl methacrylate or acrylate and the quaternized derivatives thereof, and (c) a cross-linking agent, such as a glycol or polyglycol diacrylate or dimethacrylate and also, preferably, (d) at least one acrylic monomer capable of polymerizing to a very high molecular weight, such as hydroxyethyl- or hydroxypropyl-acrylate or methacrylate, or a lower alkyl acrylate or methacrylate; if desired there may also be present in the monomer mixture (e) other polymerizable ethylenically unsaturated monomers, which are copolymerizable with components (a), (b), (c) and (d). The thus obtained cationic hydrogels are useful for combining by reaction or complexing, with water soluble or dispersible materials having an opposite charge; such as acidic or anionic agricultural chemicals (insecticides, herbicides, fungicides, plant growth regulators, etc.), germicides, pharmaceuticals, cosmetics, hormones, enzymes, flavors, fragrances, antiperspirants, metals and the like, both to recover such acidic or anionic materials from an aqueous medium and for purifying water containing them, and also for the preparation of a complex or other combination of the cationic hydrogel with such anionic materials which may be useful per se or from which the complexed or combined acidic or anionic material may be slowly or controllably released.
REFERENCES:
patent: 3178397 (1965-04-01), Olaj et al.
patent: 3532679 (1970-10-01), Steckler
patent: 3721657 (1973-03-01), Seiderman
patent: 3803104 (1974-04-01), Barabas et al.
Plastomedical Sciences, Inc.
Tone George L.
Wong, Jr. Harry
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