Controlled release products and processes for the preparation thereof
    2.
    发明授权
    Controlled release products and processes for the preparation thereof 有权
    控制释放产品及其制备方法

    公开(公告)号:US06987082B2

    公开(公告)日:2006-01-17

    申请号:US10684162

    申请日:2003-10-10

    IPC分类号: C05G3/02

    摘要: A controlled release product is provided having a suppressed initial release period and a predetermined longevity. The product includes a particulate water soluble core material and a semi-permeable coating layer applied on the core material for controlling the release rate of the core material. The semi-permeable coating layer is formulated in accordance with the following equation to provide a release rate wherein initial release of core material from the product is suppressed so that less than about 15 weight percent of core material is released from the product within a 24 hour period after application of the product and wherein longevity of release, at ambient temperature, between the time of application and the time at which at least about 75 weight percent of the core material is released from the product is 60 days or less: WVTR = ϕ · δ π ⁢ ⁢ d 2 wherein: (i) WVTR is the water vapor transmission rate of the semi-permeable coating expressed in grams·μm/meters2·day; (ii) φ is the water diffusion rate (water flux) through the semi-permeable coating expressed in grams/day; (iii) δ is the thickness of the coating layer expressed in μm; and (iv) d is the average diameter of the particulate core material expressed in meters.

    摘要翻译: 提供具有抑制的初始释放期和预定寿命的控释产品。 该产品包括颗粒状水溶性芯材和应用于芯材上的半渗透涂层,用于控制芯材的释放速率。 根据以下等式配制半透性涂层以提供释放速率,其中芯材料从产品中的初始释放被抑制,使得在24小时内从产品中小于约15重量%的芯材料被释放 在使用产品之后的时间段,并且在环境温度下,在施用时间和从产品中释放核心材料的至少约75重量%的时间之间的释放寿命为60天或更短: WVTR = pi MROW> 其中:(i)WVTR是半透膜的水蒸汽透过率,单位为克米/米 2 。 (ii)phi是通过半透膜的水扩散速率(水通量),以克/天表示; (iii)δ是以mum表示的涂层的厚度; 和(iv)d是表示为米的颗粒状芯材的平均直径。

      Controlled release products and processes for the preparation thereof
      3.
      发明授权
      Controlled release products and processes for the preparation thereof 有权
      控制释放产品及其制备方法

      公开(公告)号:US06656882B2

      公开(公告)日:2003-12-02

      申请号:US09795840

      申请日:2001-02-28

      IPC分类号: C05G302

      摘要: A controlled release product is provided having a suppressed initial release period and a predetermined longevity. The product includes a particulate water soluble core material and a semi-permeable coating layer applied on the core material for controlling the release rate of the core material. The semi-permeable coating layer is formulated in accordance with the following equation to provide a release rate wherein initial release of core material from the product is suppressed so that less than about 15 weight percent of core material is released from the product within a 24 hour period after application of the product and wherein longevity of release, at ambient temperature, between the time of application and the time at which at least about 75 weight percent of the core material is released from the product is 60 days or less: WVTR = φ · δ π ⁢   ⁢ d 2 wherein: (i) WVTR is the water vapor transmission rate of the semi-permeable coating expressed in grams·&mgr;m/meters2·day; (ii) &phgr; is the water diffusion rate (water flux) through the semi-permeable coating expressed in grams/day; (iii) &dgr; is the thickness of the coating layer expressed in &mgr;m; and (iv) d is the average diameter of the particulate core material expressed in meters.

      摘要翻译: 提供具有抑制的初始释放期和预定寿命的控释产品。 该产品包括颗粒状水溶性芯材和应用于芯材上的半渗透涂层,用于控制芯材的释放速率。 根据以下等式配制半透性涂层以提供释放速率,其中芯材料从产品中的初始释放被抑制,使得在24小时内从产品中小于约15重量%的芯材料被释放 施用产品之后的时间段,其中在环境温度下,在施用时间和从产物中释放核心材料的至少约75重量%的时间之间的释放寿命为60天以下:其中:( i)WVTR是半渗透膜的水蒸汽透过率,以克/米2日为单位表示;(ii)phi是通过半渗透性涂层的水扩散速率(水通量),以克表示 /天;(iii)三角洲是以妈妈表示的涂层的厚度; 和(iv)d是表示为米的颗粒状芯材的平均直径。

      Water soluble fertilizer compositions
      6.
      发明授权
      Water soluble fertilizer compositions 有权
      水溶性肥料成分

      公开(公告)号:US06312493B1

      公开(公告)日:2001-11-06

      申请号:US09414214

      申请日:1999-10-07

      IPC分类号: C05B700

      摘要: The present invention relates to a solid water soluble fertilizer composition containing one or more fertilizer materials and a phosphate free, organic acid which is solid at ambient temperatures. The fertilizer materials include primary macro nutrients, secondary macro nutrients, micro nutrients and mixtures thereof. The organic acid has a water solubility of at least 10 g/l (at 25° C.) and an acidifying effect in the range of 0.5 to 1.3 g HCO3−/g acid. The acidifying effect is defined as the amount of HCO3− that can be transformed into H2CO3 per gram of acid and is calculated in accordance with the following formula: 61 ⁢ n M w , acid wherein Mw,acid is the molecular weight of said acid and n represents the number of dissociation constants (i.e., pKa values) of the acid below the value of 6.35. The acid should be present in the composition in an amount sufficient to reduce the HCO3− level in water treated with the composition by between about 60-400 parts per million when applied to the water at a dosage of 1 gram per liter.

      摘要翻译: 本发明涉及含有一种或多种肥料和不含磷酸盐的有机酸的固体水溶性肥料组合物,其在环境温度下是固体。 肥料材料包括主要的宏观营养物质,次要的宏观营养物质,微量养分及其混合物。 有机酸的水溶解度至少为10g / l(25℃),酸化效果为0.5〜1.3g HCO3- / g酸。 酸化效果定义为每克酸可以转化为H 2 CO 3的HCO 3的量,并且根据下式计算:其中Mw是所述酸的分子量,n表示解离常数 (即pKa值)低于6.35的值。 当以1克/升的剂量施用于水时,酸应以组合物中存在的量足以将用组合物处理的水中的HCO 3水平降低约60-400ppm /百万分率。