Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1990-06-28
1991-03-26
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C08L 7900
Patent
active
050030000
ABSTRACT:
This invention describes novel hydrophobically associating ter or tetra polymers which can contain sulfonate functionality which are useful as aqueous fluid rheology or flow modifiers. These high molecular weight water soluble polymers contain both water soluble and water insoluble monomers. The water soluble monomers are N, N dimethylacrylamide acrylamide (DMA) and optionally a salt of an ethylenically unsaturated sulfonic acid (s) or N-vinylpyrrolidinone or a metal acrylate and the water insoluble monomer is a higher alkyl acrylamide (R). The process for their preparation relies on solubilizing the water insoluble monomer into an aqueous micellar solution containing one or more surfactants and the water soluble monomers. The surfactants are specifically selected to enable homogeneous dispersion of the hydrophobic monomer(s) in the presence of anionic sulfonate containing monomers. Redox or free radical initiators are used to copolymerize both the water soluble and water insoluble monomers, forming terpolymers of dimethylacrylamide, alkylacrylamides and acrylamide, and optionally an anionic sulfonate or carboxylate monomer. Aqueous solutions of these hydrophobically associating polymers exhibit enhanced viscosification, reduced salt sensitivity and other desirable rheological properties found useful in a variety of applications.
REFERENCES:
patent: 4395524 (1983-07-01), Emmons et al.
patent: 4417992 (1983-11-01), Bhattacharyya et al.
patent: 4673716 (1987-06-01), Siano et al.
patent: 4694046 (1987-09-01), Bak et al.
patent: 4694058 (1987-09-01), Siano et al.
patent: 4766171 (1988-08-01), DeMartino
patent: 4882405 (1989-11-01), Schulz et al.
Bock Jan
Valint Paul L.
Exxon Research & Engineering Company
Nanfeldt Richard E.
Sarofin N.
Schofer Joseph L.
LandOfFree
Hydrophobically associating polymers containing dimethyl acrylam does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydrophobically associating polymers containing dimethyl acrylam, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydrophobically associating polymers containing dimethyl acrylam will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-617714