Title:
ポリビニルアルコール樹脂の製造方法
Document Type and Number:
Japanese Patent JP5498402
Kind Code:
B2
Abstract:
Provided are a polyvinyl alcohol resin superior in handling and less prone to generate dissolution residue when dissolved in water, and a method for producing the same. A polyvinyl alcohol resin slurry obtained through a polymerization step (step S1) and a saponification step (step S2) is heated to 100°C to 170°C and volatile components contained therein are brought to 1 mass% or lower (step S3). Thereafter, the resin from which the volatile components have been removed is extrusion-molded into a strand shape using a die provided with a hole having a diameter of 3 to 8 mmµm, and the extrusion-molded resin is air-cooled or wind-cooled until the temperature reaches 45°C or lower (step S4). Then, the cooled resin is pulverized into rod-shaped particles having a length of 1 to 10 mm and maximum diameter of 0.5 to 3.0 mm (step S5).
Inventors:
Daishi Tamai
Application Number:
JP2011007674A
Publication Date:
May 21, 2014
Filing Date:
January 18, 2011
Export Citation:
Assignee:
DENKI KAGAKU KOGYO KABUSHIKI KAISHA
International Classes:
C08F16/06; C08F6/10; C08F8/12; C08F18/04; C08J3/12
Domestic Patent References:
| JP2002301715A | ||||
| JP2003136527A | ||||
| JP2000264972A | ||||
| JP2004250695A |
Attorney, Agent or Firm:
Kaoru Watanabe