Acrylic Acid → Acrylic acid maleic acid

HRID 47191

Reaction equation

HRID 47191 reaction equation
[C:1]([OH:8])(=[O:7])/[CH:2]=[CH:3]\[C:4]([OH:6])=[O:5].[OH-].[Na+].C(O)(=O)C=C.S(OOS([O-])(=O)=O)([O-])(=O)=O.[Na+].[Na+]>O>[C:4]([OH:6])(=[O:5])[CH:3]=[CH2:2].[C:1]([OH:8])(=[O:7])/[CH:2]=[CH:3]\[C:4]([OH:6])=[O:5]

Participants

6

Reactant 4

HCID 6581Acrylic AcidHCID 14798Sodium HydroxideHCID 62655Sodium PersulfateHCID 444266Maleic Acid

Product 1

HCID 86584291Acrylic acid maleic acid

Reagents, catalysts & solvents 1

HCID 962WaterSolvent3×

Conditions

Temperature
95 °C

Procedure

11 g maleic acid was dissolved in 200 g deionized water, and this solution was adjusted to pH 3.85 with 48% aqueous sodium hydroxide. The mixture was heated to 95° C. and kept at 95 to 98° C. in nitrogen atmosphere, and 64 g acrylic acid dissolved in 16 g deionized water, and 4.7 g sodium persulfate dissolved in 50 g deionized water, were separately added dropwise thereto over the period of 2 hours. Thereafter, the reaction solution was kept at 98° C., stirred for 6 hours, and retuned to room temperature to give an aqueous solution of poly(acrylic acid/maleic acid). As a result of measurement of the resulting dispersant by GPC, the weight average molecular weight was 87,000 (determined using polyethylene glycol standards). The conditions for GPC measurement were the same as in Synthesis Example 1.

Workup

  1. customkept at 95 to 98° C. in nitrogen
  2. dissolutiondissolved in 16 g
  3. dissolutiondissolved in 50 g
  4. additionwere separately added dropwise
  5. customover the period of 2 hours
  6. customwas kept at 98° C.
  7. customretuned to room temperature

Sources & evidence

ORD record
ord-f923d52a2d9f45b3bc38ae9148bf9bca
Source dataset
uspto-grants-2004_03
Patent number
US06699831B2

Linked notes

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