Copolymers useful for gelling acids
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United States of America Patent
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Feb 15, 2005
Grant Date -
Jun 5, 2003
app pub date -
Nov 7, 2001
filing date -
Nov 7, 2001
priority date (Note) -
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Abstract
Disclosed is a copolymer useful for preparing acid gels comprising a copolymer having a copolymer backbone, the copolymer having a general formula: ##STR1## wherein: (a) A is an H or other terminating group; (b) R.sub.1 is an OH or NH.sub.2 ; (c) R.sub.2 is an O or NH; (d) Z is an integer having a value of from 1 to 4; (e) X and Y are present in a ratio (X:Y) of from 3:2 to 4:1; (f) structures I and II are present as blocks or randomly distributed along the copolymer backbone; and wherein the copolymer has a molecular weight of from about 1,000,000 to about 10,000,000.
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