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:
Jul. 10, 1990
Filed:
Oct. 26, 1987
Peter Flesher, Bingley, GB;
David Farrar, Bradford, GB;
Malcolm Hawe, Huddersfield, GB;
John Langley, Shipley, GB;
Allied Colloids Limited, , GB;
Abstract
Water soluble, substantially linear, polymers having single point intrinsic viscosity above about 3 are formed from an ethylenically unsaturated monomer that includes a group --B.sub.n A.sub.m R where A is propoxy or butoxy, B is ethoxy, n is zero or an integer of 2 to 100 and m is zero or an integer less than n, and R is a hydrophobic group of at least 8 carbon atoms and comonomer selected from non-ionic monomers and dialkylamino alkyl (meth) -acrylates or -acrylamides wherein at least one of the monomers is tertiary amine acid addition or quaternary ammonium salt. The resultant water soluble, high molecular weight, cationic polymers are useful as flocculants and as viscosifiers of aqueous acid solutions such as downhole acid stimulation fluids.