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:
May. 23, 1989
Filed:
Jun. 26, 1987
Applicant:
Inventors:
Charles M Leir, New Richond, WI (US);
Jerome J Hoffman, Hastings, MN (US);
John E Stark, Rosefille, MN (US);
Assignee:
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
525410 ; 525 50 ; 525414 ; 528 38 ; 528403 ; 528408 ; 528417 ; 528425 ;
Abstract
The present invention provides a method for making primary amine terminated linear polyethers of molecular weight above about 3500 which have virtually no contamination from in-chain secondary amine functionalities or amine-terminated tertiary amine side-chains. This method involves the production of novel intermediates. The invention also provides purely linear polyether-polyurea block copolymers formed by chain extension of the primary amine terminated linear polyethers.