Title:
PRODUCTION OF POROUS POLYTETRAFLUOROETHYLENE MATERIAL
Document Type and Number:
Japanese Patent JPH0341129
Kind Code:
A
Abstract:
PURPOSE:To obtain the title material having a high strength and provided with nearly spherical pores of a relatively uniform size by firing a preform prepared by compression-molding a polytetrafluoroethylene powder obtained by suspension polymerization, stretching the preform below the m.p., contracting it and stretching it again. CONSTITUTION:A preform prepared by compression-molding a polytetrafluoroethylene powder obtained by suspension polymerization is fired above the m.p. to form a molding. This molding is stretched uniaxially or biaxially, contracted by at least 3%, and again stretched uniaxially or biaxially at least once below the m.p., of the polytetrafluoroethylene to produce the title material having a high void volume and excellent heat stability and mechanical strengths and provided with pores of a nearly spherical form and a substantially uniform pore size.
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Inventors:
HASHIDA SHIGETAKE
TOYOOKA TAKESHI
TOYOOKA TAKESHI
Application Number:
JP17734989A
Publication Date:
February 21, 1991
Filing Date:
July 10, 1989
Export Citation:
Assignee:
NIHON VALQUA KOGYO KK
International Classes:
C08J9/00; C08L27/18; (IPC1-7): C08J9/00; C08L27/18
Attorney, Agent or Firm:
Shunichiro Suzuki (1 person outside)
Next Patent: JPH0341130