| 摘要 |
<p>The present invention provides in the production of paper, cardboard or paperboard from a resin containing pulp or a mechanical wood pulp a process for inhibiting the separation of resins from said pulp which comprises adding to said pulp an additive including at least one phosphonic-acid compound having the general formula wherein R1 is H, -CH3, -NH2, -CH2OH, -(CH2)nCH3, -(CH2)nCOOH, or -(CH2)nPO3H2 R2 is H, -OH, -PO3H2, -(CH2)n COOH, , H2O3PH2C- N-(CH2)n ,</p> |
