Chemical delivery product and process for making the same
AssigneeSekisui Specialty Chemicals America, LLC
InventorsRichard Vicari, Hang Wang, Bret Hann
Life of this patent
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Abstract
A chemical delivery product for delivering an oxidizing chemical into an aqueous system is disclosed. For instance, in one embodiment, a substrate containing an oxidizing chemical, such as trichloroisocyanuric acid, is coated with a water soluble polymer in order to prevent the oxidizing chemical from degrading prior to use and in order to facilitate handling. In accordance with the present disclosure, a neutralizing agent is contacted with the substrate in order to prevent the substrate from degrading the water soluble coating. In an alternative embodiment, a package is formed from a water soluble film forming composition combined with a base.
Claims48
A chemical delivery product comprising:
- a substrate comprising an oxidizing chemical;
- an outer surface of the substrate comprising a base selected from the group consisting of:
- a hydroxide, a bicarbonate, a carbonate, a phosphate, a silicate, and a borate;
- or a reaction product of the base with the oxidizing chemical;
- and
- a coating surrounding the substrate, said coating comprising a water soluble polymer and a saccharide, wherein said water soluble polymer is a copolymer comprising vinyl alcohol units and functional comonomer units selected from the group consisting of sulfonic acid units, vinyl amine units, salts thereof and combinations thereof;
- wherein the coating resists discoloration.
A chemical delivery product comprising:
- a package made from a water soluble film, the water soluble film comprising (i) a copolymer comprising vinyl alcohol units and functional comonomer units selected from the group consisting of sulfonic acid units, vinyl amine units, salts thereof and combinations thereof, (ii) a saccharide and (iii) a base selected from the group consisting of a hydroxide, a bicarbonate, a carbonate, a phosphate, a silicate, and a borate;
- and
- an oxidizing chemical sealed in the package;
- wherein the film is resistant to discoloration.
A chemical delivery product comprising:
- a substrate comprising an oxidizing chemical;
- and
- a coating surrounding the substrate, the coating comprising a saccharide, a base selected from the group consisting of:
- a hydroxide, a bicarbonate, a carbonate, a phosphate, a silicate, and a borate;
- and a water soluble copolymer comprising vinyl alcohol units and functional comonomer units selected from the group consisting of sulfonic acid units, vinyl amine units, salts thereof and combinations thereof;
- wherein the coating is resistant to discoloration for at least 30 days after application to the substrate.
A chemical delivery product consisting essentially of:
- a substrate comprising an oxidizing chemical, an outer surface of the substrate in contact with a coating;
- an inner layer of the coating comprising a base or reaction product of the base and the substrate, the base selected from the group consisting of:
- a hydroxide, a bicarbonate, a carbonate, a phosphate, a silicate, a borate, and mixtures thereof;
- and
- an outer layer of the coating resistant to discoloration and comprising a saccharide and a water soluble copolymer comprising vinyl alcohol units and functional comonomer units selected from the group consisting of sulfonic acid units, vinyl amine units, salts thereof and combinations thereof.
A chemical delivery product for delivering an oxidizing chemical into an aqueous system, comprising:
- a package consisting essentially of a water-soluble copolymer of a vinyl alcohol monomer and a sulfonic acid monomer or sodium salt thereof and a saccharide;
- and
- a pretreated substrate, comprising an oxidizing chemical in direct contact with a neutralizing agent selected from the group consisting of:
- a hydroxide, a bicarbonate, a carbonate, a phosphate, a silicate, and a borate, sealed in the package, wherein the neutralizing agent effectively inhibits degradation and discoloration of the package by the oxidizing chemical.
A chemical delivery product comprising:
- a substrate comprising a trichloroisocyanuric acid oxidizing chemical;
- an outer surface of the substrate comprising a dichloroisocyanuric acid;
- and a coating disposed on an outer surface of the substrate, the coating comprising:
- a water-soluble copolymer selected from the group consisting of a sulfonic acid functionalized polyvinyl alcohol and a vinyl amine-functionalized polyvinyl alcohol, and a monosaccharide;
- wherein the coating resists discoloration for at least 30 days from application to the substrate.
A chemical delivery product comprising:
- a chlorinated isocyanurate substrate,
- an outer surface of the substrate in contact with a coating;
- an inner layer of the coating comprising a base selected from sodium bicarbonate, potassium bicarbonate, and sodium hydroxide;
- and
- an outer layer of the coating resistant to discoloration and comprising a water-soluble, sulfonic acid-functionalized polyvinyl alcohol copolymer and dextrose.
A chemical delivery product comprising:
- a substrate comprising an oxidizing chemical;
- a coating surrounding the substrate, the coating comprising a saccharide and a water soluble copolymer, the copolymer comprising vinyl alcohol monomer units and functional comonomer units selected from the group consisting of sulfonic acid monomer units, vinyl amine units, salts thereof and combinations thereof;
- wherein the chemical delivery product coating resists discoloration for at least 30 days from application to the substrate due to preparation selected from the group consisting of:
- pretreating the substrate with a solution or slurry having a pH of at least about 7 and raising the coating pH to greater than about 6.5.
Dependencies are inferred from the claim text.