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:
Apr. 29, 1997
Filed:
Apr. 26, 1994
Jian-ping Huang, Morris Plains, NJ (US);
Frederick P Chlanda, Rockaway, NJ (US);
The Graver Company, Union, NJ (US);
Abstract
The present invention discloses permselective membranes comprising at least one layer formed from an arylenedialkylidene polymer at least a portion of which is sulfonated, said arylenedialkylidene polymer comprising recurring monomeric units as shown by the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are alkyl having one to four carbon atoms; wherein A and B are different; A is selected from the group consisting of ##STR2## wherein R.sub.x is hydrogen or an alkyl having 1 to 4 carbon atoms, R.sub.5 is alkylidene of 1-4 carbon atoms or oxyalkylene of 1-4 carbon atoms; B is derived from the group consisting of benzene, naphthalene, thiophene, and aromatic compounds of the formula ##STR3## wherein R.sub.6 is selected from the group consisting of alkylidene of 1-4 carbon atoms, oxyalkylene of 1-4 carbon atoms, --O--, --S--; R.sub.7 and R.sub.8 may be the same or different and may be H or methyl; and n is a number sufficient to provide a copolymer having a molecular weight sufficient to form a film. Processes for making said membranes and their use as ion exchange membranes are also disclosed.