发明授权
US06521701B2 Water-retaining and optical-brightener-activating polymer composition, paper coating colors and sheets of coated paper thus obtained 失效
保水和光学增亮剂活化聚合物组合物,由此获得的纸涂层颜色和涂布纸片

Water-retaining and optical-brightener-activating polymer composition, paper coating colors and sheets of coated paper thus obtained
摘要:
A stable aqueous liquid polymer composition, which comprises: (i) at least one polyvinyl alcohol (PVA) which has an Ostwald viscosity less than 5 mPa·s corresponding to a degree of polymerization less than 600 and a molar percentage of hydrolysis ranging from 70 to 100 measured from the ester value (DIN 53401), corresponding to a molar percentage of vinyl acetate units from 30 to 0, and (ii) at least one water-soluble polymer at neutral or alkaline pH, the composition controlling the activation of optical brighteners, water retention and viscosities of paper coating colors.
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