摘要:
An insecticide comprises an aqueous suspension containing
(i) 100 parts by weight of microcapsules comprising chlorpyrifos as a core substance and a wall substance obtained by polycondensing a urea-formaldehyde prepolymer and/or melamine formaldehyde prepolymer in the presence of a water-soluble cationic urea resin and an anionic surfactant, (ii) 0.5 to 2.0 parts by weight of xanthan gum, and (iii) 0.5 to 25 parts by weight of a surfactant, the sedimentation coefficient of the diluted suspension being not less than 80% and the re-dispersibility of the said microcapsulated chlorpyrifos being not more than 5 times when a suspension containing 2.5g of chlorpyrifos is diluted with water to a volume of 250 ml.
摘要:
An insecticide comprises an aqueous suspension containing (i) 100 parts by weight of microcapsules comprising chlorpyrifos as a core substance and a wall substance obtained by polycondensing a urea-formaldehyde prepolymer and/or melamine formaldehyde prepolymer in the presence of a water-soluble cationic urea resin and an anionic surfactant, (ii) 0.5 to 2.0 parts by weight of xanthan gum, and (iii) 0.5 to 25 parts by weight of a surfactant, the sedimentation coefficient of the diluted suspension being not less than 80% and the re-dispersibility of the said microcapsulated chlorpyrifos being not more than 5 times when a suspension containing 2.5g of chlorpyrifos is diluted with water to a volume of 250 ml.
摘要:
A sheet of a color-developer for a pressure-sensitive recording paper is prepared by: (i) dissolving an organic color-developer in an organic solvent; (ii) adding the solution of the color-developer to an aqueous solution in which a surfactant and a water-soluble polymer are dissolved in a combined amount of from 0.2 to 50 parts by weight per 100 parts by weight of said solution of the color-developer; (iii) emulsifying the so-formed mixture thereby forming minute liquid droplets with a diameter of 0.01 to 2 um comprising said solution of the color-developer; (iv) heating the liquid emulsion under agitation, thereby removing said organic solvent from said liquid droplets and obtaining an aqueous slurry of said color-developer; and (v) applying the aqueous slurry of said color-developer on a supporting sheet.
摘要:
A sheet of a color-developer for a pressure-sensitive recording paper is prepared by:
(i) dissolving an organic color-developer in an organic solvent; (ii) adding the solution of the color-developer to an aqueous solution in which a surfactant and a water-soluble polymer are dissolved in a combined amount of from 0.2 to 50 parts by weight per 100 parts by weight of said solution of the color-developer; (iii) emulsifying the so-formed mixture thereby forming minute liquid droplets with a diameter of 0.01 to 2 um comprising said solution of the color-developer; (iv) heating the liquid emulsion under agitation, thereby removing said organic solvent from said liquid droplets and obtaining an aqueous slurry of said color-developer; and (v) applying the aqueous slurry of said color-developer on a supporting sheet.