Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1987-09-03
1989-03-21
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
26433112, 528331, 528481, 528502, C08G 3302
Patent
active
048145300
ABSTRACT:
Sintered polybenzimidazole articles are obtained by compacting a particulate, dried polybenzimidazole resin under a pressure of 2,000 to 10,000 psi in a mold, heating the formed article to a temperature in the range of 825.degree. to 950.degree. F. for at least four hours, cooling the polybenzimidazole article to below 800.degree. F. while maintaining the article under a pressure of 2,000 to 10,000 psi, and thereafter heating the constrained formed polybenzimidazole article to a temperature in the range of 825.degree. to 950.degree. F. for at least one hour.
REFERENCES:
patent: 3642720 (1972-02-01), Kray et al.
Alvarez Edwardo
Blake Ralph S.
Ward Bennett C.
Alpha Precision Plastics, Inc.
Anderson Harold D.
Hoechst Celanese Corporation
Stine Forrest D.
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