The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 05, 1980
Filed:
Aug. 08, 1975
Applicant:
Inventor:
Robert W Campbell, Bartlesville, OK (US);
Assignee:
Phillips Petroleum Company, Bartlesville, OK (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528340 ; 528336 ; 528348 ; 528349 ;
Abstract
Terephthalic acid and either 5-methyl-1,9-nonanediamine or an isomeric mixture of 5-methyl-1,9-nonanediamine with 2,4-dimethyl-1,8-octanediamine and/or 2,4,6-trimethyl-1,7-heptanediamine are admixed in a methanol/water medium, wherein the volume ratio of methanol to water is in the range of about 99:1 to about 80:20, and the weight ratio of terephthalic acid and diamine to the methanol/water medium is in the range of about 1:1 to about 1:3. The resulting slurry can be cooled to promote precipitation of the salt. The precipitated salt can be recovered by filtration and employed for the production of a polyamide.