Acrylamide polymers and use thereof
AssigneeMitsui Toatsu Chemicals, Inc.
InventorsHirotoshi Doki, Hitoshi Ishigaki, Toshiki Oyanagi, Tsugio Matsubara, Shigeo Watanabe
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Abstract
Provided by this invention are an acrylamide polymer which has a weight-average molecular weight (a) of from 1,500,000 to 10,000,000 and a weight-average inertial radius (b) of from 30 to 150 nm, the ratio (b)/(a) of the weight-average inertial radius (b) to the weight-average molecular weight (a) being 0.00004 or smaller; and an aqueous solution of an acrylamide polymer which solution has a polymer concentration ranging from 22 to 60%, a Brookfield viscosity at 25.degree. C. of 50,000 cps or smaller and a weight-average molecular weight of from 500,000 to 10,000,000. They are useful as paper strength agents.
Claims6
An acrylamide polymer having
- (a) a weight-average molecular weight of from 1,500,000 to 10,000,000 and
- (b) a weight-average root mean square radius of from 30 to 150 nm,
- the ratio (b)/(a) of the weight-average root mean square radius to the weight-average molecular weight being 0.00004 or smaller
- which has been obtained by polymerizing acrylamide, methacrylamide, or one or more monomers in addition to acrylamide and/or methacrylamide;
- one or more of compounds and/or salts thereof, said compounds being represented by the following formula (1):
- ##STR3## wherein R represents a hydrogen atom or a lower alkyl group and n stands for an integer of from 1 to 8 and/or salts thereof,
- which comprises a crosslinking monomer as a copolymer component.
Dependencies are inferred from the claim text.