| 摘要 |
Addition polymers in dispersion in a volatile organic liquid are plasticized by adding to the dispersion a plasticizer which is soluble in the organic liquid and which is capable of becoming chemically bound to the polymer, possibly by means of a third reactive component of the dispersion. Addition polymers specified are those derived from acrylic and methacrylic and acrylonitrile. Reactive groups may be introduced into the polymers by copolymerization with monomers such as methacrylic acid, itaconic acid, maleic anhydride, glycidyl methacrylate and methylolacrylamide. Reactive plasticizers may contain epoxy, carboxyl, amine, hydroxyl or methylol reactive groups. Third reactive components specified are condensates of formaldehyde with urea or melamine and polyisocyantes. Phenol-formaldehyde condensates may be used as third component when the addition polymer contains epoxy groups in which case the plasticizer may be dioctyl maleate. The examples describe the copolymerization of methyl methacrylate and maleic anhydride of methacrylic acid in a hydrocarbon liquid containing dissolved degraded rubber, and the addition to the resulting dispersions of the following plasticizers: (a) tetraglycerol pentabutyl ether, (b) tetraglycerol tetrabutyl ether, (c) octyl glycidyl sebacate and diglycidyl sebacate, (d) isopropyl glycidyl sebacate and diglycidyl sebacate, (e) octyl glycidyl phthalate, and (f) mixtures of hexa-isopropyl hexamethylol melamine with tetraglycerol tetrabutyl ether, pentaerythritol tributyrate and mannitol tetrabutyrate. The resulting compositions are applied to surfaces and reacted by heating to provide solvent-resistant coatings. Specifications 958,023 and 971,885 are referred to.ALSO:Surfaces of glass, tinplate and aluminium foil are coated by applying thereto compositions comprising an addition polymer in dispersion in an organic liquid containing a plasticizer which is capable of becoming chemically bound to the polymer, possibly by means of a third reactive component of the dispersion (see Division C3). The resulting coatings are rendered solvent-resistant by heating. The examples describe the coating of surfaces with dispersions in hydrocarbons of copolymers of methyl methacrylate and maleic anhydride and methacrylic acid, and containing as reactive plasticizers the following reactive compounds and mixtures: (a) tetraglycerol pentabutyl ether, (b) tetraglycerol tetrabutyl ether, (c) octyl glycidyl sebacate and diglycidyl sebacate, (d) isopropyl glycidyl sebacate and diglycidyl sebacate, (e) octyl glycidyl phthalate, and (f) mixtures of hexa-isopropyl hexamethylol melamine with tetraglycerol tetrabutyl ether, pentaerythritol tributyrate and mannitol tetrabutyrate. Specifications 958,023 and 971,885 are referred to.
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