Reaction #75469

ord-f923d52a2d9f45b3bc38ae9148bf9bca

Reaction equation

O=C(O)/C=C\C(=O)O
maleic acid
C=CC(=O)O
acrylic acid
O=S(=O)([O-])OOS(=O)(=O)[O-].[Na+].[Na+]
sodium persulfate
[Na+].[OH-]
sodium hydroxide
→
C=CC(=O)O.O=C(O)/C=C\C(=O)O
acrylic acid maleic acid

Reactants

O=C(O)/C=C\C(=O)O
maleic acid
C=CC(=O)O
acrylic acid
O=S(=O)([O-])OOS(=O)(=O)[O-].[Na+].[Na+]
sodium persulfate
[Na+].[OH-]
sodium hydroxide

Reagents

None

Solvents

O
water
O
water
O
water

Conditions

Temperature
95°CELSIUS
Detailed conditions
See reaction.notes.procedure_details.

Workup

  1. 1
    Otherkept at 95 to 98° C. in nitrogen
  2. 2
    workup.DISSOLUTIONdissolved in 16 g
  3. 3
    workup.DISSOLUTIONdissolved in 50 g
  4. 4
    workup.ADDITIONwere separately added dropwise
  5. 5
    Otherover the period of 2 hours
  6. 6
    Otherwas kept at 98° C.
  7. 7
    Otherretuned to room temperature

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.

Source

DOI: 10.6084/m9.figshare.5104873.v1Patent: US06699831B2uspto-grants-2004_03