发明名称 |
PROCESS OF MAKING PAPER |
摘要 |
According to the invention, a process of making paper comprises forming a cellulosic suspension, adding retention aid to the suspension, draining the suspension through a screen to form a sheet, and drying the sheet and in this process we add to the suspension a retention system comprising polyethylene oxide and a greater amount (dry weight) of a phenolsulphone-formaldehyde resin (PSR resin) consisting essentially of recurring units of the formula -CH2-X-, wherein (a) 65 to 95 % of the groups X are di(hydroxyphenyl) sulphone groups, (b) 5 to 35 % of the groups X are selected from hydroxy phenyl sulphonic acid groups (i.e., groups which contain at least one hydroxy-substituted phenyl ring and at least onesulphonic group) and naphthalene sulphonic acid groups and (c) 0 to 10 % of the groups X are other aromatic groups.
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申请公布号 |
WO9521296(A1) |
申请公布日期 |
1995.08.10 |
申请号 |
WO1995GB00232 |
申请日期 |
1995.02.06 |
申请人 |
ALLIED COLLOIDS LIMITED;SATTERFIELD, BRIAN, FREDERIC;STOCKWELL, JOHN, OLIVER |
发明人 |
SATTERFIELD, BRIAN, FREDERIC;STOCKWELL, JOHN, OLIVER |
分类号 |
D21H17/47;D21H17/29;D21H17/37;D21H17/45;D21H17/48;D21H17/53;D21H17/55;D21H17/56;D21H17/67;D21H21/10;D21H23/76;(IPC1-7):D21H17/53 |
主分类号 |
D21H17/47 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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