Stock material or miscellaneous articles – Composite – Of addition polymer from unsaturated monomers
Patent
1985-03-11
1986-09-16
Wong, Jr., Harry
Stock material or miscellaneous articles
Composite
Of addition polymer from unsaturated monomers
524555, 524827, 524829, 524831, B32B 2700, C08F22006
Patent
active
046122508
ABSTRACT:
Disclosed is a process for preparing water absorbing, cross-linked acrylate resins by aqueous polymerization of (A) acrylic acid neutralized 70 to 100 mole percent for example with ammonia, and/or caustic alkali and/or an amine; with (B) acrylamide in a mole ratio of 70 to 100 mole percent (A) to 30:0 mole percent (B); and (C) a water miscible or a water soluble polyvinyl monomer in an amount of 0.001 to 0.3 weight percent based on the total weight of (A) and (B). In accordance with one embodiment of the invention, the concentration of monomers (A) plus (B) should be at least 70 percent by weight of the polymerization mixture of (A) plus (B) plus (C) to achieve a substantially dry polymer (less than 15 weight percent water) when polymerization is completed by utilizing the exothermic heat of polymerization and cross-linking to drive off water without the need for additional heating to obtain a dry solid. The addition of polystyrene and/or methylcellulose substantially increases the water absorbing capacity of these polymers.
REFERENCES:
patent: 4525527 (1985-06-01), Takeda et al.
Takeda Hisao
Taniguchi Yasunori
American Colloid Company
Wong, Jr. Harry
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