Title:
POLYVINYLIDENE FLUORIDE HAVING GOOD MECHANICAL CHARACTERISTICS AND GOOD THERMOCHEMICAL STABILITY AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3520876
Kind Code:
B2
Abstract:
PURPOSE: To obtain a polyvinylidene fluoride excellent in mechanical strength, thermochemical resistance or the like in good productivity by polymerizing vinylidene fluoride in an aq. emulsion in the presence of an org. peroxide and a chain transfer agent at a specific temp.
CONSTITUTION: Vinylidene fluoride is polymerized in an aq. emulsion in the presence of an org. peroxide (e.g.; di-tert-butylperoxide) and a chain transfer agent (e.g.; chloroform) within a temp. range of 95-120°C. By this method, a polyvinylidine fluoride characterized by that tail to tail and head to head transfer amts. are 5-5.5 mol.%, a yield point is 50 MPa or more, elastic modulus is 1,500 MPa (measured at 23°C according to an ASTM D-1708 method) or more and a melt flow index (measured at 230°C under load of 5 kg according to an ASTM D-1238 method) is 1-25 g/10 min is obtained. The obtained polyvinylidene fluoride is suitable as a material for producing a pipe, a valve or a tank.
Inventors:
Brinati, Giulio
Arcella, Vincenzo
Albano, Margherita
Arcella, Vincenzo
Albano, Margherita
Application Number:
JP11536994A
Publication Date:
April 19, 2004
Filing Date:
May 27, 1994
Export Citation:
Assignee:
Ausimont, Spa
International Classes:
C08F4/32; C08F14/22; C08F114/22; (IPC1-7): C08F14/22
Attorney, Agent or Firm:
野河 信太郎
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