发明授权
US4738992A Hydrophilic polyurethane/polyurea sponge 失效
亲水性聚氨酯/聚脲海绵

Hydrophilic polyurethane/polyurea sponge
摘要:
A water-absorbing sponge comprises at least one of a pendent sulfo-group containing polyurea and polyurethane, the polymer containing at least one sulfonate equivalent per 20,000 molecular weight units.
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