Microbicides immobilized in water soluble thermoplastic resins and aqueous dispersions of microbicides prepared therefrom
First Claim
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1. A solid, melt-blended solution consisting essentially of a microbicide dissolved in a carrier resin that is a copolymer of vinyl alcohol and (alkyleneoxy) acrylate and is soluble in water to at least about 1 gm. per 100 ml. of water at 25°
- C., said solid solution being useful as a melt-processable additive to a primary rigid, non-plasticized, water-insoluble thermoplastic resin composition to impart biocidal activity thereto, said solid solution containing said microbicide at a level that is at least about 20 times higher than the normal end-use microbicide concentration in a primary rigid, non-plasticized, water-insoluble thermoplastic resin composition, said water-soluble thermoplastic carrier resin enabling said microbicide to impart improved antimicrobial activity to a rigid, non-plasticized, water-insoluble primary thermoplastic resin composition relative to the ability of water-insoluble thermoplastic carrier resins, at similar levels in a rigid, non-plasticized water-insoluble primary thermoplastic resin composition, to enable said microbicide to impart antimicrobial activity to a rigid, non-plasticized, water-insoluble primary thermoplastic resin composition.
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Abstract
Solid solutions comprise a water-soluble thermoplastic resin and a microbicide dissolved therein. These solutions may be added to a rigid thermoplastic resin composition to impart biocidal characteristics thereto. If the microbicide is water-insoluble, the solid solutions may be used to prepare stable dispersions of the microbicide. The solutions also provide for slow release of a microbicide or as a vehicle for providing microbicide to an aqueous solution.
46 Citations
19 Claims
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1. A solid, melt-blended solution consisting essentially of a microbicide dissolved in a carrier resin that is a copolymer of vinyl alcohol and (alkyleneoxy) acrylate and is soluble in water to at least about 1 gm. per 100 ml. of water at 25°
- C., said solid solution being useful as a melt-processable additive to a primary rigid, non-plasticized, water-insoluble thermoplastic resin composition to impart biocidal activity thereto, said solid solution containing said microbicide at a level that is at least about 20 times higher than the normal end-use microbicide concentration in a primary rigid, non-plasticized, water-insoluble thermoplastic resin composition, said water-soluble thermoplastic carrier resin enabling said microbicide to impart improved antimicrobial activity to a rigid, non-plasticized, water-insoluble primary thermoplastic resin composition relative to the ability of water-insoluble thermoplastic carrier resins, at similar levels in a rigid, non-plasticized water-insoluble primary thermoplastic resin composition, to enable said microbicide to impart antimicrobial activity to a rigid, non-plasticized, water-insoluble primary thermoplastic resin composition.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A solid, melt-blended solution consisting essentially of a water-insoluble microbicide dissolved in a carrier resin that is a copolymer of vinyl alcohol and (alkyleneoxy) acrylate and is soluble in water to at least about 1 gm. per 100 ml. of water at 25°
- C., said microbicide comprising at least about 0.01 wt. % of said solid solution, said solid solution when placed in an aqueous medium forming a dispersion of said water-insoluble microbicide in which said carrier resin stabilizes said dispersion.
- View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
Specification