Humectant compositions that effectively increase moisture retention in soil and associated methods for identifying same

  • US 10,352,011 B2
  • Filed: 03/13/2014
  • Issued: 07/16/2019
  • Est. Priority Date: 03/13/2013
  • Status: Active Grant
First Claim
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1. A humectant composition for increasing moisture retention in a soil, the humectant composition consists of a composition of the formula
Y[Za(CH2CH2O)b(CH2CH(CH3)O)cH]x,whereinY is derived from an organic compound having x reactive hydroxyl groups;

  • Z represents a heteric copolymer derived from the alkoxylation reaction product of ethylene oxide and propylene oxide,the subscript a is a positive number,the subscript b is zero or a positive number,the subscript c is zero or a positive number, andthe subscript x is one or greater; and

    wherein the weight average molecular weight of the composition ranges from 2000 to 6000 g/mol,wherein the composition comprises the reaction product of;

    (i) 3% by weight of a trifunctional alcohol,(ii) 10 to 15% by weight of ethylene oxide, and(iii) 82 to 87% by weight of propylene oxide,or the reaction product of;

    (i) 3 to 8% by weight of a monofunctional alcohol or difunctional alcohol,(ii) 82 to 87% by weight of ethylene oxide, and(iii) more than 0 and up to 10% by weight of propylene oxide,wherein said humectant composition provides an increasing average moisture content of the soil to which it is applied along an entirety of a length of an average slope curve from a minimum humectant concentration level to a maximum humectant concentration level,wherein said average slope curve is determined by plotting an average moisture content of said soil having said humectant composition applied thereon at concentration levels from the minimum humectant concentration level to the maximum humectant concentration level, andwherein said average slope curve has a p value of 0.05 or less.

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