Patent ID: 7064149

Claim:
A process for preparing polymer latex resin powder comprising; introducing an emulsifier into a storage tank containing a polymer latex emulsion to form a polymer latex; continuously supplying the polymer latex, primary coagulant and water to a primary coagulation tank to prepare a mixture, wherein the primary coagulant is diluted to concentration of 5 to 10 wt % with water and introduced in an amount of 0.5 to 2.5 weight parts per 100 weight parts of polymer; primary coagulating the mixture in the primary coagulation tank by allowing the mixture to remain for 2 to 5 minutes to prepare a primary coagulated slurry wherein a temperature of the primary coagulation tank is 30 to 40° C. lower than or equal to the glass transition temperature of the polymer latex and transferring the prepared primary coagulated slurry to a secondary coagulation tank; secondary coagulating in the primary coagulated slurry in the secondary coagulation tank by allowing the primary coagulated slurry to remain for 10 to 25 minutes to prepare a secondary coagulated slurry wherein a temperature of the secondary coagulation tank is 1 to 10° C. greater than or equal to the temperature of the primary coagulation tank, and transferring the prepared secondary coagulated slurry to a primary aging tank, wherein the secondary coagulant is introduced in an amount of 2 to 3 weight parts per 100 weight parts of polymer; primary aging the secondary coagulated slurry in the primary aging tank by allowing the secondary coagulated slurry to remain for 60 to 90 minutes to prepare a primary aged slurry, wherein a temperature of the primary aging tank is 5 to 20° C. greater than or equal to the temperature of the secondary coagulation tank, and transferring the prepared primary aged slurry to a secondary aging tank; and secondary aging the primary aged slurry in the secondary aging tank by allowing the primary aged slurry to remain for 60 to 90 minutes, wherein a temperature of the secondary aging tank is 10 to 20° C. greater than or equal to the temperature of the primary aging tank.