EP0307816A2 - Process for improving the printability of paper - Google Patents
Process for improving the printability of paper Download PDFInfo
- Publication number
- EP0307816A2 EP0307816A2 EP88114757A EP88114757A EP0307816A2 EP 0307816 A2 EP0307816 A2 EP 0307816A2 EP 88114757 A EP88114757 A EP 88114757A EP 88114757 A EP88114757 A EP 88114757A EP 0307816 A2 EP0307816 A2 EP 0307816A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- weight
- polymer
- cationic
- paper
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000008569 process Effects 0.000 title claims abstract description 10
- 125000002091 cationic group Chemical group 0.000 claims abstract description 43
- 239000000049 pigment Substances 0.000 claims abstract description 30
- 238000004513 sizing Methods 0.000 claims abstract description 22
- 239000011248 coating agent Substances 0.000 claims abstract description 19
- 239000002270 dispersing agent Substances 0.000 claims abstract description 11
- 239000004815 dispersion polymer Substances 0.000 claims abstract description 10
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims abstract description 4
- 239000004094 surface-active agent Substances 0.000 claims abstract description 4
- 239000000178 monomer Substances 0.000 claims description 53
- 239000006185 dispersion Substances 0.000 claims description 42
- 229920000642 polymer Polymers 0.000 claims description 41
- 229920002472 Starch Polymers 0.000 claims description 40
- 235000019698 starch Nutrition 0.000 claims description 40
- 239000008107 starch Substances 0.000 claims description 32
- 239000000203 mixture Substances 0.000 claims description 22
- 239000000243 solution Substances 0.000 claims description 22
- 239000007864 aqueous solution Substances 0.000 claims description 20
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 19
- 239000003995 emulsifying agent Substances 0.000 claims description 19
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 13
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 10
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 10
- 238000007720 emulsion polymerization reaction Methods 0.000 claims description 8
- 239000003999 initiator Substances 0.000 claims description 7
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims description 6
- 150000001298 alcohols Chemical class 0.000 claims description 6
- 229920006317 cationic polymer Polymers 0.000 claims description 6
- 229920001282 polysaccharide Polymers 0.000 claims description 6
- 159000000000 sodium salts Chemical class 0.000 claims description 6
- GYCMBHHDWRMZGG-UHFFFAOYSA-N Methylacrylonitrile Chemical compound CC(=C)C#N GYCMBHHDWRMZGG-UHFFFAOYSA-N 0.000 claims description 5
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 5
- UIWXSTHGICQLQT-UHFFFAOYSA-N ethenyl propanoate Chemical compound CCC(=O)OC=C UIWXSTHGICQLQT-UHFFFAOYSA-N 0.000 claims description 5
- 150000004676 glycans Chemical class 0.000 claims description 5
- 239000005017 polysaccharide Substances 0.000 claims description 5
- 230000009477 glass transition Effects 0.000 claims description 4
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- 239000007787 solid Substances 0.000 abstract description 16
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- 239000000463 material Substances 0.000 abstract description 2
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- 239000008199 coating composition Substances 0.000 description 16
- 238000005259 measurement Methods 0.000 description 16
- 238000006116 polymerization reaction Methods 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- 239000002245 particle Substances 0.000 description 11
- -1 chalk Chemical compound 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 8
- 238000007334 copolymerization reaction Methods 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 238000006467 substitution reaction Methods 0.000 description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 6
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- 238000004519 manufacturing process Methods 0.000 description 6
- 229920001592 potato starch Polymers 0.000 description 6
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 5
- 239000011541 reaction mixture Substances 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 4
- 239000000084 colloidal system Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000007859 condensation product Substances 0.000 description 4
- 125000002791 glucosyl group Chemical group C1([C@H](O)[C@@H](O)[C@H](O)[C@H](O1)CO)* 0.000 description 4
- 229920001519 homopolymer Polymers 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- OSSNTDFYBPYIEC-UHFFFAOYSA-N 1-ethenylimidazole Chemical compound C=CN1C=CN=C1 OSSNTDFYBPYIEC-UHFFFAOYSA-N 0.000 description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000013543 active substance Substances 0.000 description 3
- 150000001412 amines Chemical class 0.000 description 3
- 125000000129 anionic group Chemical group 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 150000001735 carboxylic acids Chemical class 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 3
- 239000004816 latex Substances 0.000 description 3
- 229920000126 latex Polymers 0.000 description 3
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 3
- 235000019394 potassium persulphate Nutrition 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 3
- HXVJQEGYAYABRY-UHFFFAOYSA-N 1-ethenyl-4,5-dihydroimidazole Chemical compound C=CN1CCN=C1 HXVJQEGYAYABRY-UHFFFAOYSA-N 0.000 description 2
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 2
- SJIXRGNQPBQWMK-UHFFFAOYSA-N 2-(diethylamino)ethyl 2-methylprop-2-enoate Chemical compound CCN(CC)CCOC(=O)C(C)=C SJIXRGNQPBQWMK-UHFFFAOYSA-N 0.000 description 2
- DPBJAVGHACCNRL-UHFFFAOYSA-N 2-(dimethylamino)ethyl prop-2-enoate Chemical compound CN(C)CCOC(=O)C=C DPBJAVGHACCNRL-UHFFFAOYSA-N 0.000 description 2
- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 2
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 2
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229960000583 acetic acid Drugs 0.000 description 2
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 2
- 229920006318 anionic polymer Polymers 0.000 description 2
- 239000003945 anionic surfactant Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- VAYGXNSJCAHWJZ-UHFFFAOYSA-N dimethyl sulfate Chemical compound COS(=O)(=O)OC VAYGXNSJCAHWJZ-UHFFFAOYSA-N 0.000 description 2
- LQZZUXJYWNFBMV-UHFFFAOYSA-N dodecan-1-ol Chemical compound CCCCCCCCCCCCO LQZZUXJYWNFBMV-UHFFFAOYSA-N 0.000 description 2
- 230000007515 enzymatic degradation Effects 0.000 description 2
- 239000012362 glacial acetic acid Substances 0.000 description 2
- 238000007646 gravure printing Methods 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
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- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 2
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 2
- 239000011976 maleic acid Substances 0.000 description 2
- 125000005395 methacrylic acid group Chemical group 0.000 description 2
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 2
- 125000000896 monocarboxylic acid group Chemical group 0.000 description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
- 238000007645 offset printing Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
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- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 235000019333 sodium laurylsulphate Nutrition 0.000 description 2
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Chemical compound [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 2
- RPACBEVZENYWOL-XFULWGLBSA-M sodium;(2r)-2-[6-(4-chlorophenoxy)hexyl]oxirane-2-carboxylate Chemical compound [Na+].C=1C=C(Cl)C=CC=1OCCCCCC[C@]1(C(=O)[O-])CO1 RPACBEVZENYWOL-XFULWGLBSA-M 0.000 description 2
- DAJSVUQLFFJUSX-UHFFFAOYSA-M sodium;dodecane-1-sulfonate Chemical compound [Na+].CCCCCCCCCCCCS([O-])(=O)=O DAJSVUQLFFJUSX-UHFFFAOYSA-M 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 150000003460 sulfonic acids Chemical class 0.000 description 2
- ISXSCDLOGDJUNJ-UHFFFAOYSA-N tert-butyl prop-2-enoate Chemical compound CC(C)(C)OC(=O)C=C ISXSCDLOGDJUNJ-UHFFFAOYSA-N 0.000 description 2
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 2
- DOGQRRGVLIGIEG-UHFFFAOYSA-N 1-(prop-2-enoylamino)butane-2-sulfonic acid Chemical class CCC(S(O)(=O)=O)CNC(=O)C=C DOGQRRGVLIGIEG-UHFFFAOYSA-N 0.000 description 1
- MPPPKRYCTPRNTB-UHFFFAOYSA-N 1-bromobutane Chemical compound CCCCBr MPPPKRYCTPRNTB-UHFFFAOYSA-N 0.000 description 1
- XYXKGFAXOACTEE-UHFFFAOYSA-N 1-prop-1-enyl-4,5-dihydroimidazole Chemical compound CC=CN1CCN=C1 XYXKGFAXOACTEE-UHFFFAOYSA-N 0.000 description 1
- IJLJDZOLZATUFK-UHFFFAOYSA-N 2,2-dimethylpropyl prop-2-enoate Chemical compound CC(C)(C)COC(=O)C=C IJLJDZOLZATUFK-UHFFFAOYSA-N 0.000 description 1
- QHVBLSNVXDSMEB-UHFFFAOYSA-N 2-(diethylamino)ethyl prop-2-enoate Chemical compound CCN(CC)CCOC(=O)C=C QHVBLSNVXDSMEB-UHFFFAOYSA-N 0.000 description 1
- XRFNTXLDNOXNLP-UHFFFAOYSA-N 2-(dimethylaminomethylidene)-4,4-dimethylpentanoic acid Chemical compound CN(C)C=C(C(O)=O)CC(C)(C)C XRFNTXLDNOXNLP-UHFFFAOYSA-N 0.000 description 1
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- WDQMWEYDKDCEHT-UHFFFAOYSA-N 2-ethylhexyl 2-methylprop-2-enoate Chemical compound CCCCC(CC)COC(=O)C(C)=C WDQMWEYDKDCEHT-UHFFFAOYSA-N 0.000 description 1
- QENRKQYUEGJNNZ-UHFFFAOYSA-N 2-methyl-1-(prop-2-enoylamino)propane-1-sulfonic acid Chemical compound CC(C)C(S(O)(=O)=O)NC(=O)C=C QENRKQYUEGJNNZ-UHFFFAOYSA-N 0.000 description 1
- ZHCGVAXFRLLEFW-UHFFFAOYSA-N 2-methyl-3-(prop-2-enoylamino)propane-1-sulfonic acid Chemical compound OS(=O)(=O)CC(C)CNC(=O)C=C ZHCGVAXFRLLEFW-UHFFFAOYSA-N 0.000 description 1
- RUMACXVDVNRZJZ-UHFFFAOYSA-N 2-methylpropyl 2-methylprop-2-enoate Chemical compound CC(C)COC(=O)C(C)=C RUMACXVDVNRZJZ-UHFFFAOYSA-N 0.000 description 1
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- BOZBBKZCBLPUSG-UHFFFAOYSA-N 2-prop-1-enyl-1h-imidazole Chemical compound CC=CC1=NC=CN1 BOZBBKZCBLPUSG-UHFFFAOYSA-N 0.000 description 1
- WWJCRUKUIQRCGP-UHFFFAOYSA-N 3-(dimethylamino)propyl 2-methylprop-2-enoate Chemical compound CN(C)CCCOC(=O)C(C)=C WWJCRUKUIQRCGP-UHFFFAOYSA-N 0.000 description 1
- UFQHFMGRRVQFNA-UHFFFAOYSA-N 3-(dimethylamino)propyl prop-2-enoate Chemical compound CN(C)CCCOC(=O)C=C UFQHFMGRRVQFNA-UHFFFAOYSA-N 0.000 description 1
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- KBLWLMPSVYBVDK-UHFFFAOYSA-N cyclohexyl prop-2-enoate Chemical compound C=CC(=O)OC1CCCCC1 KBLWLMPSVYBVDK-UHFFFAOYSA-N 0.000 description 1
- BSVQJWUUZCXSOL-UHFFFAOYSA-N cyclohexylsulfonyl ethaneperoxoate Chemical compound CC(=O)OOS(=O)(=O)C1CCCCC1 BSVQJWUUZCXSOL-UHFFFAOYSA-N 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
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- DENRZWYUOJLTMF-UHFFFAOYSA-N diethyl sulfate Chemical compound CCOS(=O)(=O)OCC DENRZWYUOJLTMF-UHFFFAOYSA-N 0.000 description 1
- 229940008406 diethyl sulfate Drugs 0.000 description 1
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002255 enzymatic effect Effects 0.000 description 1
- 229940088598 enzyme Drugs 0.000 description 1
- 229960003750 ethyl chloride Drugs 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- IVJISJACKSSFGE-UHFFFAOYSA-N formaldehyde;1,3,5-triazine-2,4,6-triamine Chemical compound O=C.NC1=NC(N)=NC(N)=N1 IVJISJACKSSFGE-UHFFFAOYSA-N 0.000 description 1
- SLGWESQGEUXWJQ-UHFFFAOYSA-N formaldehyde;phenol Chemical compound O=C.OC1=CC=CC=C1 SLGWESQGEUXWJQ-UHFFFAOYSA-N 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 229940093915 gynecological organic acid Drugs 0.000 description 1
- LNMQRPPRQDGUDR-UHFFFAOYSA-N hexyl prop-2-enoate Chemical compound CCCCCCOC(=O)C=C LNMQRPPRQDGUDR-UHFFFAOYSA-N 0.000 description 1
- 150000002432 hydroperoxides Chemical class 0.000 description 1
- 229920001600 hydrophobic polymer Polymers 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910000358 iron sulfate Inorganic materials 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- SNQQPOLDUKLAAF-UHFFFAOYSA-N nonylphenol Chemical compound CCCCCCCCCC1=CC=CC=C1O SNQQPOLDUKLAAF-UHFFFAOYSA-N 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 150000004976 peroxydisulfates Chemical class 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 229920000962 poly(amidoamine) Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- ODGAOXROABLFNM-UHFFFAOYSA-N polynoxylin Chemical compound O=C.NC(N)=O ODGAOXROABLFNM-UHFFFAOYSA-N 0.000 description 1
- 229920003009 polyurethane dispersion Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- BOQSSGDQNWEFSX-UHFFFAOYSA-N propan-2-yl 2-methylprop-2-enoate Chemical compound CC(C)OC(=O)C(C)=C BOQSSGDQNWEFSX-UHFFFAOYSA-N 0.000 description 1
- LYBIZMNPXTXVMV-UHFFFAOYSA-N propan-2-yl prop-2-enoate Chemical compound CC(C)OC(=O)C=C LYBIZMNPXTXVMV-UHFFFAOYSA-N 0.000 description 1
- NHARPDSAXCBDDR-UHFFFAOYSA-N propyl 2-methylprop-2-enoate Chemical compound CCCOC(=O)C(C)=C NHARPDSAXCBDDR-UHFFFAOYSA-N 0.000 description 1
- PNXMTCDJUBJHQJ-UHFFFAOYSA-N propyl prop-2-enoate Chemical compound CCCOC(=O)C=C PNXMTCDJUBJHQJ-UHFFFAOYSA-N 0.000 description 1
- 238000005956 quaternization reaction Methods 0.000 description 1
- XWGJFPHUCFXLBL-UHFFFAOYSA-M rongalite Chemical compound [Na+].OCS([O-])=O XWGJFPHUCFXLBL-UHFFFAOYSA-M 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 description 1
- JVBXVOWTABLYPX-UHFFFAOYSA-L sodium dithionite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])=O JVBXVOWTABLYPX-UHFFFAOYSA-L 0.000 description 1
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 1
- 235000010262 sodium metabisulphite Nutrition 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 230000009182 swimming Effects 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- NLVXSWCKKBEXTG-UHFFFAOYSA-N vinylsulfonic acid Chemical compound OS(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H5/00—Special paper or cardboard not otherwise provided for
- D21H5/12—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials
- D21H5/14—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials of cellulose fibres only
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/3188—Next to cellulosic
- Y10T428/31895—Paper or wood
- Y10T428/31899—Addition polymer of hydrocarbon[s] only
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/3188—Next to cellulosic
- Y10T428/31895—Paper or wood
- Y10T428/31899—Addition polymer of hydrocarbon[s] only
- Y10T428/31902—Monoethylenically unsaturated
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/3188—Next to cellulosic
- Y10T428/31895—Paper or wood
- Y10T428/31906—Ester, halide or nitrile of addition polymer
Definitions
- a pigment coat For example, it is known from EP-PS 51 144 to use finely divided polymer dispersions containing nitrogen-containing monomers in polymerized form as mass and surface sizing agents for paper and for coating or impregnating paper and building materials.
- these coating compositions contain no pigments.
- the polymer dispersions are prepared by a two-stage polymerization, in which in the first stage of polymerization a monomer mixture comprising a nitrogen-containing monomer, e.g.
- these polymer dispersions are good surface sizing agents.
- a paper coating composition which contains 1 to 30 parts by weight, based on the solids content, of an amphoteric copolymer latex per 100 parts by weight of a pigment.
- the copolymer contains 20 to 50% by weight of an aliphatic conjugated diolefin, 0.5 to 5% by weight of an ethylenically unsaturated acidic monomer, for example acrylic acid, methacrylic acid or itaconic acid, 0.5 to 5% by weight of an ethylenically unsaturated amine monomer, for example diethylaminoethyl methacrylate , and 10 to 74% by weight of a monoolefinically unsaturated monomer, for example styrene.
- the latex must not contain more than 1% by weight, based on the copolymer, of an emulsifier and should have a gel point within the pH range from 3.5 to 8.5 and should be gellable during the drying of the paper coated with the coating composition.
- the amount of the coating composition applied to one side of the paper is approximately 16 g / m 2 .
- the pigment coat improves the printability of the paper. This procedure is from. suffered from the outset that, due to the high application quantity of the coating composition, no papers with particularly low basis weights can be produced.
- the disadvantages of surface sizing are the limited production capacity due to the application of the surface sizing agent using the size press.
- the present invention has for its object to provide a method for improving the printability of paper, which can be operated at high machine speeds, so that a direct coupling of the remuneration of the paper with the paper production is possible.
- any uncoated, uncoated or otherwise uncoated base paper can be improved.
- the used Natural paper should have the same color acceptability and a high smoothness.
- Such papers are mainly used for newspapers, magazines and advertising brochures.
- the paper qualities mentioned are printed, for example, using the offset or gravure printing process.
- the coating agent to be used according to the invention is a mixture of the above-mentioned components a) to c).
- Fine-particle pigments are used as component a) of the mixture. These are the pigments commonly used in paper coating, e.g. Calcium carbonate, chalk, kaolin, clay, titanium dioxide, barium sulfate, satin white, talc, aluminum silicate, calcium sulfate, magnesium carbonate.
- the particle size of the pigments is 0.2 to 10 u.m. Calcium carbonate, the particle size of which is 87% below 2 ⁇ m, is preferably used as the pigment.
- Basic, ethylenically unsaturated monomers are, for example, acrylic and methacrylic esters of amino alcohols, e.g. Dimethylaminoethyl acrylate, dimethylaminethyl methacrylate, diethylaminoethyl acrylate, diethylaminoethyl methacrylate, dimethylaminopropylacrylate, dimethylaminopropyl methacrylate, dibutylaminopropylacrylate, dibutylaminopropyl methacrylate, dimethylaminoneopentylacrylate, methacrylate amide, methacrylate amide, methacrylate amide, methacrylate amide,
- the quaternary compounds of formula 11 are obtained by reacting the basic monomers of formula I with known quaternizing agents, for example with benzyl chloride, methyl chloride, ethyl chloride, butyl bromide, dimethyl sulfate and diethyl sulfate. In the quaternized form, these monomers lose their basic character.
- the compounds of the formula I can also be used in the form of the salts with inorganic or saturated organic acids in the copolymerization.
- Suitable basic monomers are, for example, N-vinylimidazole, 2-methylvinylimidazole, N-vinylimidazoline, 2-methylvinylimidazoline and the corresponding quaternization products or salts of the basic monomers mentioned.
- the group 2) monomers include acrylic and methacrylic esters derived from monohydric, saturated Cs to Cs alcohols, e.g. n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, tert-butyl acrylate, neopentyl acrylate, n-hexyl acrylate, cyclohexyl acrylate, 2-ethylhexyl acrylate and the corresponding methacrylic acid esters, e.g.
- n-propyl methacrylate, iso-propyl methacrylate, iso-butyl methacrylate and 2-ethylhexyl methacrylate are preferably used in amounts of 38 to 75% by weight.
- Suitable monomers of group 3 which are optionally used to modify the copolymers, are, for example, ethylenically unsaturated C 3 - to Cs-carboxylic acids, such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid and maleic acid semiesters.
- This group of monomers also includes vinylsulfonic acid and 2-acrylamidomethylpropanesulfonic acid or water-soluble salts of the carboxylic acids and sulfonic acids mentioned.
- the ethylenically unsaturated carboxylic acids and sulfonic acids can be completely neutralized with sodium hydroxide solution, potassium hydroxide solution, ammonia and / or amines or only partially, for example 5 to 95%.
- a further modification possibility of the copolymers from the monomers of groups 1) and 2) results from the fact that basic compounds which have already been mentioned above can be polymerized in as a monomer of group 3), cf.
- the monomers of groups 1) to 3) are copolymerized in the manner of an emulsion copolymer Rization in an aqueous medium in the presence of degraded cationic starches with a viscosity ⁇ i of 0.04 to 0.50 dl / g.
- Such starches contain quaternized aminoalkyl groups. These strengths are commercially available. If the viscosity of these starches is not already in the specified range, they are subjected to oxidative, thermal, acidolytic or enzymatic degradation to the desired viscosity. Cationized, enzymatically degraded potato starch is preferably used.
- the degree of substitution of the cationic starch is 0.01 to 0.1 mol of nitrogen per mol of glucose unit.
- the relative viscosity of the digested starch solutions is determined in 1% by weight aqueous solutions using a capillary viscometer at 25 ° C. and a pH of 3.5, the relative viscosity being determined from the corrected throughput times for solvents t o and solution ti according to the following equation calculated.
- the conversion to 71i is carried out according to the relationship given above on the basis of the information in “Methods in Carbohydrate Chemistry”, Volume IV, Starch, Academic Press, New York and London, 1964, page 127.
- an aqueous solution which contains 1.5 to 25, preferably 1.7 to 21% by weight of a degraded starch with a viscosity ⁇ i of 0.04 to 0.50 dl / g dissolved .
- Degraded starches with a viscosity in the range of 0.3 to 0.5 dl / g are preferably used when it is desired to produce dispersions with a low solids content.
- the degraded starches with a lower viscosity, ie in the range from 0.04 to about 0.3 dl / g, are preferably used in the production of dispersions with higher solids contents, for example 25 to 40% by weight.
- starches of different viscosities 71i can also be used as protective colloids, but the viscosity of the mixture must be in the specified ⁇ i range from 0.04 to 0.50 dl / g, ie starch mixtures can also be used in this case where the viscosity of a starch is outside the specified range.
- 10 to 56 parts by weight of a monomer mixture of components (1) to (3) are subjected to the copolymerization per 100 parts by weight of such an aqueous starch solution.
- the monomers can be emulsified either in the form of a mixture or separately from one another in the aqueous solution of the degraded starch.
- an emulsifier can be added to the aqueous starch solution.
- the monomers can also first be emulsified in water with the aid of an emulsifier and then added in the form of the emulsion to the aqueous starch solution.
- Products with anionic or cationic character are suitable as emulsifiers.
- Such emulsifiers are, for example, sodium alkyl sulfonate, sodium lauryl sulfate, sodium dodecylbenzenesulfonate or dimethylalkylbenzylammonium chloride.
- anionic emulsifiers for anionic starches and cationic emulsifiers for cationic starches.
- the amount of emulsifier which is optionally used is 0 to 0.3, preferably 0.05 to 0.2% by weight, based on the sum of the monomers (1) to (3) used.
- the emulsion polymerization is preferably carried out in the absence of an emulsifier.
- the copolymerization of the monomers in the aqueous solution of the degraded starch is carried out at temperatures from 40 to 110, preferably 50 to 100 ° C. in the presence of an initiator containing peroxide groups.
- Hydrogen peroxide combinations of hydrogen peroxide with a heavy metal salt, e.g. Iron-II-sulfate or a redox system made of hydrogen peroxide with a suitable reducing agent, such as sodium formaldehyde sulfoxylate, ascorbic acid, sodium disulfite and / or sodium dithionite.
- a redox system of hydrogen peroxide, a reducing agent or a mixture of the reducing agents mentioned and, in addition, a small amount of a heavy metal salt, such as, for example, iron (II) sulfate, are preferably used.
- a heavy metal salt such as, for example, iron (II) sulfate
- Other suitable initiators containing peroxide groups are, for example, organic peroxides, hydroperoxides and peroxydisulfates.
- Suitable compounds of this type are, for example, tert-butyl hydroperoxide, acetylcyclohexylsulfonyl peroxide, sodium peroxydisulfate, potassium peroxydisulfate or ammonium peroxydisulfate.
- the components must be thoroughly mixed during the polymerization.
- the reaction mixture is preferably stirred for the entire duration of the polymerization and any subsequent polymerization, if appropriate, to lower the residual monomer content.
- the polymerization is carried out in the absence of oxygen in an inert gas atmosphere, for example under nitrogen.
- the oxygen is first removed from the aqueous solution of the starch and from the monomers and first 1 to 40% of the monomers to be polymerized are added to the aqueous solution of the starch and the monomers therein are emulsified by stirring the reaction mixture.
- the polymerisation begins, as a rule after a short induction period, by adding an aqueous initiator solution beforehand, simultaneously or subsequently.
- the heat of polymerization which arises at the beginning of the polymerization can be used to heat the reaction mixture.
- the temperature can rise to 90 ° C.
- the copolymerization can also be carried out batchwise or continuously.
- a finely divided, aqueous dispersion is obtained in which the copolymer particles are surrounded by a protective colloid shell based on a degraded starch.
- a measure of the fine particle size of the dispersion is the LD value (light transmission value of the dispersion).
- the LD value is measured by measuring the dispersion in 0.01% by weight aqueous solution in a cuvette with an edge length of 2.5 cm with light of the wavelength 546 nm and comparing it with the permeability of water under the conditions mentioned above .
- the permeability of water is given as 100%. The more finely divided the dispersion, the higher the LD value, which is measured using the method described above.
- the average particle size of the copolymer particles without the protective colloid shell from degraded starch can be determined if the starch shell of the latex particles is virtually completely enzymatically degraded. Possible coagulation of the copolymer dispersion can be prevented by adding a suitable emulsifier. After enzymatic degradation, the particle size of the copolymer dispersion can then be measured using commercially available devices, e.g. with the help of the Nanosizer from Coulter Electronics. The average diameter of the copolymer particles without the protective colloid shell is 75 to 110 nm.
- the aqueous polymer dispersions of component b) are prepared with a composition such that the polymers have a glass transition temperature of 5 to 80, preferably 15 to 60 ° C.
- the concentration of the polymer in the aqueous dispersion is 15 to 55, preferably 20 to 45,% by weight.
- the coating compositions contain, based on the solids of the dispersion, 5 to 70, preferably 8 to 30, parts by weight of component b), based on 100 parts by weight of a finely divided pigment or a mixture of pigments.
- 5 to 30% by weight of the polymer of component b) or a mixture of polymers of component b) are preferably replaced by at least one water-soluble polysaccharide. Suitable water-soluble polysaccharides are water-soluble starches, carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose and galactomannans.
- component c) of the coating compositions surface-active substances and / or polymeric dispersants come into consideration, each of which disrupt or prevent the formation of surface sizing by the surface sizing agent b).
- the surface-active substances and the polymeric dispersants improve the wettability of the paper with water.
- Suitable surface-active compounds have an HLB value of at least 10 (for a definition of the HLB value, see WC Griffin, J. Cosmetic Chemist, Volume 5, 311 (1954).
- the surface-active substances in question are, for example, as surfactant classes in the Tensid-Taschenbuch by Dr. Stachel, Carl-Hanser-Verlag, Kunststoff-Vienna, 2nd edition 1981, pages 4 to 10.
- Nonionic, anionic as well as cationic surfactants can be used. Products of this type are produced, for example, by the addition of ethylene oxide and / or alcohols, phenols, amines and fatty acids containing 8 to 22 carbon atoms are of particular interest from this group of compounds are, for example, the adducts of 10 to 50 moles of ethylene oxide with 1 mole of dodecanol, C 9 C 13 alcohols and nonylphenol the anionic surfactants come primarily into consideration as component c) sodium lauryl sulfonate.
- Suitable polymeric dispersant of component c) are for example polymers of ethylenically unsaturated C 3 - to Cs-carboxylic acids having a K-value of 10 measured to 50 (in 1% aqueous solution at 25 * C and pH 8 on the sodium salt of the polymers), polymers of acrylamide, methacrylamide and vinyl pyrrolidone with a K value of 10 to 60, polyvinyl alcohols with a molecular weight of 2,000 to 200,000, lignin sulfonates, phenol-formaldehyde condensation products. Urea-formaldehyde condensation products, melamine-formaldehyde condensation products, sulfonated. aromatic formaldehyde condensation products, polyamidoamines, commercially available polyethyleneimines and polydiallyldimethylaminochlorides with a molecular weight of 2,000 to 200,000.
- polymeric dispersant of component c preference is given to using homopolymers of acrylic acid or methacrylic acid with a K value of 10 to 40 (measured in 1% by weight aqueous solution at 25 ° C. and pH 8 on the sodium salt of the polymers).
- a method of making such Polymers are known, for example, from US Pat. No. 4,301,266.
- copolymers of acrylic acid and / or methacrylic acid with acrylamidomethylpropanesulfonic acids are also used in the preferred embodiment of the process according to the invention.
- Copolymers of this type are known, for example, from US Pat. No. 4,450,013 as dispersants and grinding aids for pigments.
- Preferred copolymers used contain 5 to 60% by weight of copolymerized acrylamidomethylpropanesulfonic acid and have a K value in the range from 12 to 35 (measured using the Na salt in a 1% strength aqueous solution at pH 8).
- copolymers of acrylic acid and methacrylic acid which contain the monomers copolymerized in any ratio and have a K value in the range from 10 to 50, or homopolymers of acrylamido-2-methylpropanesulfonic acid with K values from 10 to 35, as polymeric dispersant of component c) are used.
- the coating compositions to be used according to the invention are obtained by mixing the individual components a) to c).
- the pigments can be introduced into the aqueous cationic polymer dispersion of a paper sizing agent and then at least one of the compounds suitable according to c) can be added, or the procedure can be followed such that an aqueous pigment slurry, the solids concentration of which is first prepared by mixing components a) and c) is, for example, in the range from 40 to 85% by weight and the aqueous pigment slurry thus obtained is then mixed with at least one cationic aqueous polymer dispersion of a paper sizing agent.
- a method of operation is particularly preferred in which aqueous slurries of pigments are used, which are obtained by grinding and dispersing the pigments in the presence of polymers of ethylenically unsaturated C 3 to Cs carboxylic acids with a K value of 10 to 50 (measured in 1% strength) aqueous solution at 25 ° C and pH 8 on the sodium salt of the polymer) are available.
- calcium carbonate or chalk is preferably used as the pigment and polyacrylic acid or a copolymer of acrylic acid and acrylamidomethylpropanesulfonic acid with a K value of 10 to 30 (measured as Na salt as stated above) is used as the polymeric dispersant.
- pigment slurries with a particle size of the dispersed particles of approximately 90% ⁇ 2 ⁇ m.
- Such pigment slurries even in high concentrations, for example at solids contents between 60 and 80% by weight, still have a viscosity such that the slurries are light are to be handled.
- These pigment slurries are then mixed with at least one cationic aqueous polymer dispersion according to b).
- the coating compositions which are then applied to the surface of the paper have a solids content in the range from 5 to 60, preferably 15 to 35% by weight.
- the pH of the coating compositions is in the range from 5 to 10.
- the coating compositions are applied to paper on one or both sides.
- the coating compositions are preferably applied continuously using known devices such as those used in paper coating, e.g. Blade, speed sizer and short dwell coater.
- the paper web is guided through the coating unit at a speed of more than 750 m / min, preferably 1000 to 1400 m / min.
- These high coating speeds make it possible to couple the coating of the paper directly with the paper production and to integrate a coating unit into a paper machine.
- a natural paper is then directly obtained, which can be used, for example, in offset printing and gravure printing and as newsprint.
- the parts given in the examples are parts by weight, the percentages are percentages by weight.
- the relative viscosity was measured in 1% by weight aqueous solutions at 25 ° C. and a pH of 3.5 using a capillary viscometer.
- the intrinsic viscosity was calculated from the relative viscosity using the formula given above.
- the printability properties of the coated papers were assessed on the basis of whiteness, brightness, opacity, bleed through and translucency.
- whiteness was measured in accordance with DIN 53145.
- opacity was determined in accordance with DIN 53146.
- the other criteria were determined using the following methods:
- a 40% cationic polymer dispersion which has an LD value is prepared by copolymerization of 20 parts by weight of a N-vinylimidazole quaternized with dimethyl sulfate, 26 parts of acrylonitrile and 54 parts of n-butyl acrylate out of 84.
- Starch II presented and heated to a temperature of 85 C with stirring.
- Starch I is a degraded, cationic potato starch with an intrinsic viscosity ⁇ i of 0.47 dl / g, a degree of substitution of 0.027 mol nitrogen per mol glycose unit and 0.015 mol COOH groups per mol glycose unit.
- the solids content of the starch is 83%.
- Starch II is a degraded, cationic potato starch with an intrinsic viscosity ⁇ i of 1.16 dl / g with a degree of substitution of 0.07 mole nitrogen per mole glycose unit.
- the solids content of the starch is 83%.
- Anionic copolymer dispersion is prepared by polymerizing in the manner of an emulsion polymerization at 80 ° C. by mixing an emulsion of 66.3 parts of n-butyl acrylate, 14 parts of acrylonitrile, 15 parts of styrene and 4 parts of acrylic acid and, at the same time, an aqueous solution of potassium peroxydisulfate in an aqueous solution Solution of sodium lauryl sulfonate metered and polymerized therein. A 50% anionic polymer dispersion with an LD value of 72 is obtained.
- JP-OS 58/115196 500 parts of a 6.6% aqueous solution of an oxidatively degraded potato starch are placed in a 2-liter flask provided with a stirrer and a reflux condenser.
- the degraded potato starch has an intrinsic viscosity ⁇ i ; of 0.27 dl / g and a degree of substitution of 0.034 moles of carboxyl groups per mole of glucose unit.
- 44 parts of styrene, 71.7 parts of n-butyl acrylate and 21.7 parts of tert-butyl acrylate and 3 parts of potassium peroxydisulfate in 50 parts of water are then added to the template, which has been heated to 80 to 90 ° C.
- An anionic polymer dispersion with a solids content of 25% and an LD value of 90 is obtained.
- aqueous starch solution is prepared separately, which is obtained by dissolving 6.7 kg of a cationic or oxidatively degraded starch in 70 kg of water.
- the cationic starch has an intrinsic viscosity ⁇ i of 1.6 and a degree of substitution of 0.09 moles of nitrogen per mole of glucose unit.
- the oxidatively degraded starch has an intrinsic viscosity of ⁇ i of 0.6 dl / g and a degree of substitution of 0.025 moles of COOH groups per mole of glucose unit.
- the coating compositions are then prepared in each case by adding 33.3 kg, based on the polymer, of the cationic dispersions 1 to 3 and of the comparative dispersions 1 and 2 to the mixture of pigment slurry and soluble starch described above.
- the coating agent is adjusted to a solids content of approx. 25% by weight by adding 150 kg of water in each case.
- a natural gravure paper with a basis weight of 60 g / m 2 is coated on both sides with the coating agents described above in a technical coater by means of a blade applicator at a speed of the paper web of 1000 m / min.
- the application weight is 1 g / m2 and page.
- the coated paper web is dried in each case.
- the table shows the coating compositions used in each case and the properties of the coated papers obtained in each case. It can be seen from this that, according to the invention, a considerable improvement in the printability compared to the comparative dispersions is achieved.
Landscapes
- Paper (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Cable Accessories (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
- Optical Filters (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
Description
Um die Eigenschaften von Rohpapieren zu verbessern, führt man entweder eine Oberflächenleimung durch oder versieht die Oberfläche der Papiere mit einem Pigmentstrich. So ist beispielsweise aus der EP-PS 51 144 bekannt, feinteilige, stickstoffhaltige Monomere einpolymerisiert enthaltende Polymerdispersionen als Masse- und Oberflächenleimungsmittel für Papier sowie zum Beschichten oder Imprägnieren von Papier und Baustoffen zu verwenden. Diese Beschichtungsmittel enthalten jedoch keine Pigmente. Die Polymerdispersionen werden durch eine zweistufige Polymerisation hergestellt, wobei man in der ersten Polymerisationsstufe eine Monomerenmischung, die ein stickstoffhaltiges Monomer, z.B. Dimethylaminoethylacrylat, mindestens ein nichtionisches, hydrophobes, ethylenisch ungesättigtes Monomer, wobei diese Monomeren, wenn sie für sich alleine polymerisiert werden, hydrophobe Polymerisate bilden, und eine ethylenisch ungesättigte Carbonsäure oder Maleinsäureanhydrid in einem mit Wasser mischbaren Lösemittel nach Art einer Lösungscopolymerisation ein niedrig-molekulares Vorpolymerisat herstellt, die Lösung des Vorpolymerisats dann mit Wasser verdünnt und in dieser Polymerlösung in der zweiten Stufe der Polymerisation, bezogen auf 1 Gew.-Teil des Lösungscopolymerisats, 1 bis 32 Gew.-Teile mindestens eines nichtionischen, hydrophoben, ethylenisch ungesättigten Monomeren nach Art einer Emulsionspolymerisation in Gegenwart von üblichen Mengen an wasserlöslichen Polymerisationsinitiatoren polymerisiert. Wie aus den Beispielen hervorgeht, sind diese Polymerdispersionen gute Oberflächenleimungsmittel.In order to improve the properties of base papers, one either carries out surface sizing or provides the surface of the papers with a pigment coat. For example, it is known from EP-PS 51 144 to use finely divided polymer dispersions containing nitrogen-containing monomers in polymerized form as mass and surface sizing agents for paper and for coating or impregnating paper and building materials. However, these coating compositions contain no pigments. The polymer dispersions are prepared by a two-stage polymerization, in which in the first stage of polymerization a monomer mixture comprising a nitrogen-containing monomer, e.g. Dimethylaminoethyl acrylate, at least one nonionic, hydrophobic, ethylenically unsaturated monomer, these monomers, when polymerized on their own, form hydrophobic polymers, and an ethylenically unsaturated carboxylic acid or maleic anhydride in a water-miscible solvent in the manner of a solution copolymerization, a low molecular weight prepolymer prepares, the solution of the prepolymer is then diluted with water and in this polymer solution in the second stage of the polymerization, based on 1 part by weight of the solution copolymer, 1 to 32 parts by weight of at least one nonionic, hydrophobic, ethylenically unsaturated monomer in the manner of Emulsion polymerization polymerized in the presence of conventional amounts of water-soluble polymerization initiators. As can be seen from the examples, these polymer dispersions are good surface sizing agents.
Aus der DE-OS 28 35 125 ist eine Papierüberzugsmasse bekannt, die auf 100 Gew.-Teile eines Pigments 1 bis 30 Gew.-Teile, bezogen auf den Feststoffgehalt, eines amphoteren Copolymerisatlatex enthält. Das Copolymerisat enthält 20 bis 50 Gew.% eines aliphatischen konjugierten Diolefins, 0,5 bis 5 Gew.% eines ethylenisch ungesättigten sauren Monomeren, z.B. Acrylsäure, Methacrylsäure oder Itaconsäure, 0,5 bis 5 Gew.% eines ethylenisch ungesättigten Aminmonomeren, z.B. Diethylaminoethylmethacrylat, und 10 bis 74 Gew.% eines monoolefinisch ungesättigten Monomeren, z.B. Styrol. Der Latex darf nicht mehr als 1 Gew.%, bezogen auf das Copolymerisat, eines Emulgators enthalten und soll einen Gelpunkt innerhalb des pH-Bereichs von 3,5 bis 8,5 haben und während der Trocknung des mit der Überzugsmasse gestrichenen Papiers gelierbar sein. Gemäß den Angaben in Beispiel 1 beträgt die Menge der auf eine Seite des Papiers aufgetragenen Überzugsmasse etwa 16 g/m2. Mit Hilfe des Pigmentstrichs wird die Bedruckbarkeit des Papiers verbessert. Dieses Verfahren ist von . vornherein mit dem Nachteil behaftet, daß aufgrund der hohen Auftragsmenge der Überzugsmasse keine Papiere mit besonders niedrigen Flächengewichten herstellbar sind. Die Nachteile bei der Oberflächenleimung liegen in der begrenzten Produktionskapazität aufgrund der Applikation der Oberflächenleimungsmittel mit Hilfe der Leimpresse.From DE-OS 28 35 125 a paper coating composition is known which contains 1 to 30 parts by weight, based on the solids content, of an amphoteric copolymer latex per 100 parts by weight of a pigment. The copolymer contains 20 to 50% by weight of an aliphatic conjugated diolefin, 0.5 to 5% by weight of an ethylenically unsaturated acidic monomer, for example acrylic acid, methacrylic acid or itaconic acid, 0.5 to 5% by weight of an ethylenically unsaturated amine monomer, for example diethylaminoethyl methacrylate , and 10 to 74% by weight of a monoolefinically unsaturated monomer, for example styrene. The latex must not contain more than 1% by weight, based on the copolymer, of an emulsifier and should have a gel point within the pH range from 3.5 to 8.5 and should be gellable during the drying of the paper coated with the coating composition. According to the information in Example 1, the amount of the coating composition applied to one side of the paper is approximately 16 g / m 2 . The pigment coat improves the printability of the paper. This procedure is from. suffered from the outset that, due to the high application quantity of the coating composition, no papers with particularly low basis weights can be produced. The disadvantages of surface sizing are the limited production capacity due to the application of the surface sizing agent using the size press.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Verbesserung der Bedruckbarkeit von Papier zur Verfügung zu stellen, bei dem mit hohen Maschinengeschwindigkeiten gearbeitet werden kann, so daß unmittelbar eine Kopplung der Vergütung des Papiers mit der Papierherstellung möglich ist.The present invention has for its object to provide a method for improving the printability of paper, which can be operated at high machine speeds, so that a direct coupling of the remuneration of the paper with the paper production is possible.
Die Aufgabe wird erfindungsgemäß gelöst mit einem Verfahren zur Verbesserung der Bedruckbarkeit von Papier durch ein- oder beidseitiges Auftragen von wäßrigen Beschichtungsmitteln aus Pigmenten und Bindemitteln auf die Oberfläche des Papiers und Trocknen des beschichteten Papiers, wenn man als Beschichtungsmittel eine Mischung aus
- a) 100 Gew.-Teilen eines feinteiligen Pigmentes,
- b) 5 bis 70 Gew.-Teilen, bezogen auf Polymer, einer kationischen wäßrigen Polymerdispersion eines Papierleimungsmittels, dessen Polymer eine Glasübergangstemperatur von 5 bis 80 C hat, und
- c) 0,01 bis 10 Gew.-Teilen eines die Ausbildung der Oberflächenleimung störenden oberflächenaktiven Stoffs und/oder eines polymeren Dispergiermittels
in einer Menge von 0,5 bis 4 gim2 aufträgt. Bis zu 90, vorzugsweise 5 bis 30 Gew.% des Polymerisats der Komponente b) können durch ein wasserlösliches Polysaccharid ersetzt sein. Obwohl die Komponente b) ein typisches kationisches Oberflächenleimungsmittel für Papier darstellt, wird die Leimungswirkung des Leimungsmittels in der applizierten Formulierung praktisch aufgehoben und überraschenderweise eine deutliche Verbesserung der Bedruckbarkeit des so behandelten Papiers erzielt. Besonders hervorzuheben sind hierbei die Eigenschaften, wie Opazität, Durchschlagen, Durchscheinen. Weiße und Helligkeit, die nach dem erfindungsgemäßen Verfahren verbessert werden.The object is achieved according to the invention with a process for improving the printability of paper by applying aqueous coating compositions of pigments and binders to the surface of the paper on one or both sides and drying the coated paper if a mixture of is used as the coating composition
- a) 100 parts by weight of a finely divided pigment,
- b) 5 to 70 parts by weight, based on polymer, of a cationic aqueous polymer dispersion of a paper sizing agent, the polymer of which has a glass transition temperature of 5 to 80 ° C., and
- c) 0.01 to 10 parts by weight of a surface-active substance which disturbs the formation of surface sizing and / or a polymeric dispersant
in an amount of 0.5 to 4 gim 2 . Up to 90, preferably 5 to 30% by weight of the polymer of component b) can be replaced by a water-soluble polysaccharide. Although component b) is a typical cationic surface sizing agent for paper, the sizing effect of the sizing agent in the applied formulation is practically eliminated and, surprisingly, a significant improvement in the printability of the paper treated in this way is achieved. Particularly noteworthy are the properties, such as opacity, penetration, show-through. Whiteness and brightness, which are improved by the method according to the invention.
Nach dem erfindungsgemäßen Verfahren kann generell jedes ungestrichene, unbeschichtete oder sonst keiner Veredlung unterzogene Rohpapier in der Bedruckbarkeit verbessert werden. Es handelt sich hierbei um Naturpapiere, vorzugsweise um holzhaltiges Druckpapier, das in den meisten Fällen stark satiniert ist und ein Flächengewicht von mindestens 30 glm2, vorzugsweise mehr als 35 glm2 aufweist. Das verwendete Naturpapier soll gleiche Farb annahmefähigkeit und eine hohe Glätte aufweisen. Derartige Papiere werden vornehmlich für Zeitungen, Illustrierte Zeitschriften und Werbeprospekte verwendet. Die genannten Papierqualitäten werden beispielsweise nach dem Offset- oder Tiefdruckverfahren bedruckt.In general, the printability of any uncoated, uncoated or otherwise uncoated base paper can be improved. These are natural papers, preferably wood-containing printing paper, which in most cases is heavily satined and has a weight per unit area of at least 30 g l m 2 , preferably more than 35 glm 2 . The used Natural paper should have the same color acceptability and a high smoothness. Such papers are mainly used for newspapers, magazines and advertising brochures. The paper qualities mentioned are printed, for example, using the offset or gravure printing process.
Das gemäß Erfindung zu verwendende Beschichtungsmittel ist eine Mischung aus den oben angegebenen Komponenten a) bis c). Als Komponente a) der Mischung werden feinteilige Pigmente eingesetzt. Hierbei handelt es sich um die üblicherweise in der Papierstreicherei verwendeten Pigmente, z.B. Calciumcarbonat, Kreide, Kaolin, Clay, Titandioxid, Bariumsulfat, Satinweiß, Talkum, Aluminiumsilikat, Calciumsulfat, Magnesiumcarbonat. Die Teilchengröße der Pigmente beträgt 0,2 bis 10 u.m. Vorzugsweise verwendet man als Pigmente Calciumcarbonat, dessen Teilchengröße zu 87 % unterhalb 2 µm beträgt.The coating agent to be used according to the invention is a mixture of the above-mentioned components a) to c). Fine-particle pigments are used as component a) of the mixture. These are the pigments commonly used in paper coating, e.g. Calcium carbonate, chalk, kaolin, clay, titanium dioxide, barium sulfate, satin white, talc, aluminum silicate, calcium sulfate, magnesium carbonate. The particle size of the pigments is 0.2 to 10 u.m. Calcium carbonate, the particle size of which is 87% below 2 μm, is preferably used as the pigment.
Als Komponente b) werden kationische wäßrige Polymerdispersionen eines Papierleimungsmittels eingesetzt, dessen Polymer eine Glasübergangstemperatur von 5 bis 80 C hat. Derartige kationische Polymerdispersionen sind bekannt und ergeben, für sich allein auf die Oberfläche des Papiers aufgetragen, eine Papierleimung. Der kationische Charakter der Dispersion kommt dadurch zustande, daß man in das Polymerisat der Dispersion mindestens ein kationisches Monomer einpolymerisiert oder beim ausschließlichen Einsatz nichtionischer Monomerer bei der Polymerisation mindestens einen kationischen Emulgator verwendet. Es ist selbstverständlich auch möglich, bei der Polymerisation sowohl kationische Monomere als auch kationische Emulgatoren einzusetzen. In der Mischung mit den anderen beiden Bestandteilen des Beschichtungsmittels wirken diese Dispersionen jedoch als Bindemittel und tragen zusammen mit den anderen Bestandteilen zur Verbesserung der Bedruckbarkeit des Papiers bei. Geeignete kationische Dispersionen b) enthalten beispielsweise 1 bis 40 Gew.% mindestens eines kationischen Monomers einpolymerisiert. Dispersionen dieser Art sind beispielsweise aus der DE-PS 1 696 326 und der DE-AS 1 546 236 bekannt. Diese kationischen Dispersionen werden durch Emulsionspolymerisation in Gegenwart von kationischen und/oder nichtionischen Emulgatoren hergestellt. Geeignete kationische Verbindungen haben beispielsweise die allgemeine Formel
in der
- A = O, NH,
- B = CmH2n, n = 1 bis 8,
- R1, R2 = CmH 2m+1, m = 1 bis 4 und
- R3 = H, CH3
- bedeutet.
in the
- A = O, NH,
- B = C m H 2n , n = 1 to 8,
- R1, R2 = C m H 2m + 1 , m = 1 to 4 and
- R 3 = H, CH 3
- means.
Die quaternierten Verbindungen können mit Hilfe der folgenden Formel
- X- = OH-, CI-, Br-, CH3-0S03-H
- R4 = CmH2m+1, m = 1 bis 4
charakterisiert werden. Die übrigen Substituenten haben die in Formel I angegebene Bedeutung.The quaternized compounds can be made using the following formula
- X- = OH-, CI-, Br-, CH 3 -0S0 3 -H
- R 4 = C m H 2m + 1 , m = 1 to 4
be characterized. The other substituents have the meaning given in formula I.
Basische, ethylenisch ungesättigte Monomere sind beispielsweise Acrylsäure- und Methacrylsäureester von Aminoalkoholen, z.B. Dimethylaminoethylacrylat, Dimethylaminethylmethacrylat, Diethylaminoethylacrylat, Diethylaminoethylmethacrylat, Dimethylaminopropylacrylat, Dimethylaminopropylmethacrylat, Dibutylaminopropylacrylat, Dibutylaminopropylmethacrylat, Dimethylaminoneopentylacrylat, Aminogruppen enthaltende Derivate des Acrylamids oder Methacrylamids, wie Acrylamidodimethylpropylamin, Methacrylamidodimethylpropylamin und Methacrylamidodiethylpropylamin.Basic, ethylenically unsaturated monomers are, for example, acrylic and methacrylic esters of amino alcohols, e.g. Dimethylaminoethyl acrylate, dimethylaminethyl methacrylate, diethylaminoethyl acrylate, diethylaminoethyl methacrylate, dimethylaminopropylacrylate, dimethylaminopropyl methacrylate, dibutylaminopropylacrylate, dibutylaminopropyl methacrylate, dimethylaminoneopentylacrylate, methacrylate amide, methacrylate amide, methacrylate amide, methacrylate amide,
Die quaternären Verbindungen der Formel 11 werden erhalten, indem man die basischen Monomeren der Formel I mit bekannten Quaternisierungsmitteln umsetzt, z.B. mit Benzylchlorid, Methylchlorid, Ethylchlorid, Butylbromid, Dimethylsulfat und Diethylsulfat. Diese Monomeren verlieren in der quaternisierten Form ihren basischen Charakter. Die Verbindungen der Formel I können auch in Form der Salze mit anorganischen oder gesättigten organischen Säuren bei der Copolymerisation einsetzt werden.The quaternary compounds of formula 11 are obtained by reacting the basic monomers of formula I with known quaternizing agents, for example with benzyl chloride, methyl chloride, ethyl chloride, butyl bromide, dimethyl sulfate and diethyl sulfate. In the quaternized form, these monomers lose their basic character. The compounds of the formula I can also be used in the form of the salts with inorganic or saturated organic acids in the copolymerization.
Weitere geeignete basische Monomere sind beispielsweise N-Vinylimidazol, 2-Methylvinylimidazol, N-Vinylimidazolin, 2-Methylvinylimidazolin und die entsprechenden Quaternisierungsprodukte oder Salze der genannten basischen Monomeren.Other suitable basic monomers are, for example, N-vinylimidazole, 2-methylvinylimidazole, N-vinylimidazoline, 2-methylvinylimidazoline and the corresponding quaternization products or salts of the basic monomers mentioned.
Geeignete kationische Papierleimungsmittel sind beispielsweise aus folgenden Literaturstellen bekannt:
- DE-OS 24 52 585, EP-PS 51 144, DE-AS 16 21 689, DE-OS 34 01 573,
- DE-OS 25 19 581, EP-PS 58 313, EP-A 221 400 und EP-A-165 150.
- DE-OS 24 52 585, EP-PS 51 144, DE-AS 16 21 689, DE-OS 34 01 573,
- DE-OS 25 19 581, EP-PS 58 313, EP-A 221 400 and EP-A-165 150.
Bei den in den vorstehend genannten Schriften angegebenen kationischen Leimungsmitteln handelt es sich um Dispersionen, die nach einem zweistufigen Polymerisationsverfahren hergestellt werden, um kationisch modifizierte Polyurethandispersionen sowie um Copolymerisate, die durch direkte Copolymerisation der Monomeren erhältlich sind. Bei der zweistufigen Polymerisation stellt man zunächst ein niedrigmolekulares Polymerisat her, das dann als Emulgator für die nachfolgende Emulsionspolymerisation verwendet wird. Das als kationischer Emulgator verwendete niedrigmolekulare Polymerisat, das zunächst hergestellt wird, kann beispielsweise 5 bis 100 Gew.% eines basische Stickstoffatome aufweisenden Monomers einpolymerisiert enthalten und eine Lösungsviskosität 17rel von 1,05 bis 1,4 haben. Die Viskosität ηrel wird in Wasser bei einem pH-Wert von 3,5 und einer Temperatur von 25' C bei einer Polymerkonzentration von 1 g/100 ml Wasser gemessen. Dieses niedrigmolekulare Polymerisat dient dann als Emulgator für die Emulsionspolymerisation von Monomermischungen, die beispielsweise folgende Zusammensetzung haben:
- 1) 20 bis 65 Gew.% Acrylnitril, Methacrylnitril, Methacrylsäuremethylester und/oder Styrol,
- 2) 35 bis 80 Gew.% mindestens eines Acrylsäure- oder Methacrylsäureesters von jeweils einwertigen, gesättigten Cs- bis Cs-Alkoholen, Vinylacetat, Vinylpropionat und/oder Butadien-1,3 und
- 3) 0 bis 10 Gew.% anderen ethylenisch ungesättigten copolymerisierbaren Monomeren,
wobei die Summe der Angaben in Gew.% unter 1) bis 3) immer 100 beträgt. Der kationische Charakter der Polymerdispersionen beruht dann auf dem Gehalt an dem in der ersten Stufe der Polymerisation hergestellten niedrigmolekularen kationischen Polymerisat.The cationic sizing agents specified in the abovementioned documents are dispersions which are prepared by a two-stage polymerization process, cationically modified polyurethane dispersions and copolymers which are obtainable by direct copolymerization of the monomers. In the two-stage polymerization, a low molecular weight polymer is first prepared, which is then used as an emulsifier for the subsequent emulsion polymerization. The low molecular weight polymer used as a cationic emulsifier, which is initially prepared, can, for example, contain 5 to 100% by weight of a monomer having basic nitrogen atoms in copolymerized form and have a solution viscosity 17 rel of 1.05 to 1.4. The viscosity ηrel is measured in water at a pH of 3.5 and a temperature of 25 'C at a polymer concentration of 1 g / 100 ml of water. This low molecular weight polymer then serves as an emulsifier for the emulsion polymerization of monomer mixtures which, for example, have the following composition:
- 1) 20 to 65% by weight of acrylonitrile, methacrylonitrile, methacrylic acid methyl ester and / or styrene,
- 2) 35 to 80% by weight of at least one acrylic or methacrylic acid ester of monohydric, saturated Cs to Cs alcohols, vinyl acetate, vinyl propionate and / or 1,3-butadiene and
- 3) 0 to 10% by weight of other ethylenically unsaturated copolymerizable monomers,
the sum of the percentages by weight under 1) to 3) is always 100. The cationic character of the polymer dispersions is then based on the content of the low molecular weight cationic polymer produced in the first stage of the polymerization.
Besonders bevorzugt werden als Komponente b) Polymerdispersionen eingesetzt, die durch Copolymerisieren von 10 bis 56 Gew.-Teilen einer Monomermischung aus
- 1) 20 bis 65 Gew.% Acrylnitril, Methacrylnitril, Methacrylsäuremethylester und/oder Styrol,
- 2) 35 bis 80 Gew.% mindestens eines Acrylsäure- oder Methacrylsäureesters von jeweils einwertigen, gesättigten C3- bis Cs-Alkoholen, Vinylacetat, Vinylpropionat undioder Butadien-1,3 und
- 3) 0 bis 10 Gew.% anderen ethylenisch ungesättigten copolymerisierbaren Monomeren,
wobei die Summe der Angaben in Gew.% unter 1) bis 3) immer 100 beträgt, nach Art einer Emulsionspolymerisation in 100 Gew.-Teilen einer wäßrigen Lösung, die 1,5 bis 25 Gew.% einer kationischen Stärke mit einer Viskosität ηi = 0,04 bis 0,50 dl/g gelöst enthält, bei Temperaturen von 40 bis 100°C in Gegenwart eines Peroxidgruppen aufweisenden Initiators erhältlich sind. Die Monomeren der Gruppe 1) werden vorzugsweise zu 25 bis 62 Gew.% verwendet. Aus dieser Gruppe von Monomeren werden vorzugsweise Styrol und Acrylnitril eingesetzt.Particularly preferred as component b) are polymer dispersions which consist of 10 to 56 parts by weight of a monomer mixture by copolymerization
- 1) 20 to 65% by weight of acrylonitrile, methacrylonitrile, methacrylic acid methyl ester and / or styrene,
- 2) 35 to 80% by weight of at least one acrylic acid or methacrylic acid ester of monovalent, saturated C 3 - to Cs alcohols, vinyl acetate, vinyl propionate and i or 1,3-butadiene and
- 3) 0 to 10% by weight of other ethylenically unsaturated copolymerizable monomers,
the sum of the data in% by weight under 1) to 3) is always 100, in the manner of an emulsion polymerization in 100 parts by weight of an aqueous solution which contains 1.5 to 25% by weight of a cationic starch with a viscosity ηi = Contains 0.04 to 0.50 dl / g dissolved, are available at temperatures from 40 to 100 ° C in the presence of an initiator containing peroxide groups. The monomers of group 1) are preferably used in an amount of 25 to 62% by weight. From this group of monomers, styrene and acrylonitrile are preferably used.
Die Monomeren der Gruppe 2) umfassen Acrylsäure- und Methacrylsäureester, die sich von einwertigen, gesättigten Cs- bis Cs-Alkoholen ableiten, z.B. n-Propylacrylat, iso-Propylacrylat, n-Butylacrylat, isoButylacrylat, tert.-Butylacrylat, Neopentylacrylat, n-Hexylacrylat, Cyclohexyl-acrylat, 2-Ethylhexylacrylat und die entsprechenden Methacrylsäureester, z.B. n-Propylmethacrylat, iso-Propylmethacrylat, iso-Butylmethacrylat und 2-Ethylhexylmethacrylat. Die Monomeren der Gruppe 2) werden vorzugsweise in Mengen von 38 bis 75 Gew.% eingesetzt.The group 2) monomers include acrylic and methacrylic esters derived from monohydric, saturated Cs to Cs alcohols, e.g. n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, tert-butyl acrylate, neopentyl acrylate, n-hexyl acrylate, cyclohexyl acrylate, 2-ethylhexyl acrylate and the corresponding methacrylic acid esters, e.g. n-propyl methacrylate, iso-propyl methacrylate, iso-butyl methacrylate and 2-ethylhexyl methacrylate. The monomers of group 2) are preferably used in amounts of 38 to 75% by weight.
Als Monomere der Gruppe 3), die gegebenenfalls zur Modifizierung der Copolymerisate verwendet werden, eignen sich beispielsweise ethylenisch ungesättigte C3- bis Cs-Carbonsäuren, wie Acrylsäure, Methacrylsäure, Maleinsäure, Fumarsäure, Itaconsäure und Maleinsäurehalbester. Zu dieser Gruppe von Monomeren gehören auch Vinylsulfonsäure und 2-Acrylamidomethylpropansulfonsäure bzw. wasserlösliche Salze der genannten Carbonsäuren und Sulfonsäuren. Die ethylenisch ungesättigten Carbonsäuren und Sulfonsäuren können vollständig mit Natronlauge, Kalilauge, Ammoniak und/oder Aminen neutralisiert sein oder auch nur partiell, z.B. zu 5 bis 95 %.Suitable monomers of group 3), which are optionally used to modify the copolymers, are, for example, ethylenically unsaturated C 3 - to Cs-carboxylic acids, such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid and maleic acid semiesters. This group of monomers also includes vinylsulfonic acid and 2-acrylamidomethylpropanesulfonic acid or water-soluble salts of the carboxylic acids and sulfonic acids mentioned. The ethylenically unsaturated carboxylic acids and sulfonic acids can be completely neutralized with sodium hydroxide solution, potassium hydroxide solution, ammonia and / or amines or only partially, for example 5 to 95%.
Eine weitere Modifizierungsmöglichkeit der Copolymerisate aus den Monomeren der Gruppen 1) und 2) ergibt sich dadurch, daß man als Monomer der Gruppe 3) basische Verbindungen einpolymerisieren kann, die oben bereits genannt worden sind, vgl. Formeln I und Il sowie zusätzlich N-Vinylimidazol und N-Vinylimidazolin sowie die entsprechenden quaternisierten und substituierten Verbindungen.A further modification possibility of the copolymers from the monomers of groups 1) and 2) results from the fact that basic compounds which have already been mentioned above can be polymerized in as a monomer of group 3), cf. Formulas I and Il and in addition N-vinylimidazole and N-vinylimidazoline and the corresponding quaternized and substituted compounds.
Die Copolymerisation der Monomeren der Gruppen 1) bis 3) erfolgt nach Art einer Emulsionscopolymerisation in wäßrigem Medium in Gegenwart von abgebauten kationischen Stärken mit einer Viskosität ηi von 0,04 bis 0,50 dl/g. Solche Stärken enthalten quaternisierte Aminoalkylgruppen. Diese Stärken sind im Handel erhältlich. Sofern die Viskosität dieser Stärken nicht bereits in dem angegebenen Bereich liegt, werden sie einem oxidativen, thermischen, acidolytischen oder enzymatischen Abbau bis zur gewünschten Viskosität unterworfen. Vorzugsweise verwendet man kationisierte, enzymatisch abgebaute Kartoffelstärke. Der Substitutionsgrad der kationischen Stärke beträgt 0,01 bis 0,1 Mol Stickstoff pro Mol Glucose-Einheit.The monomers of groups 1) to 3) are copolymerized in the manner of an emulsion copolymer Rization in an aqueous medium in the presence of degraded cationic starches with a viscosity ηi of 0.04 to 0.50 dl / g. Such starches contain quaternized aminoalkyl groups. These strengths are commercially available. If the viscosity of these starches is not already in the specified range, they are subjected to oxidative, thermal, acidolytic or enzymatic degradation to the desired viscosity. Cationized, enzymatically degraded potato starch is preferably used. The degree of substitution of the cationic starch is 0.01 to 0.1 mol of nitrogen per mol of glucose unit.
Die Viskosität ηi - auch "Intrinsic-Viskosität" genannt - von Stärke wird aus der relativen Viskosität ηrel gemäß folgender Gleichung 711 = (2,303 x log ηrel)/Konzentration
errechnet. Die Konzentration wird dabei in g/100 ml angegeben. Die relative Viskosität der aufgeschlossenen Stärkelösungen wird an 1 gew.%igen wäßrigen Lösungen mit Hilfe eines Kapillar-Viskosimeters bei 25 C und einem pH-Wert von 3,5 bestimmt, wobei man die relative Viskosität aus den korrigierten Durchlaufzeiten für Lösungsmittel to und Lösung ti gemäß folgender Gleichung
errechnet. Die Umrechnung auf 71i erfolgt nach der oben angegebenen Beziehung aufgrund der Angaben in "Methods in Carbohydrate Chemistry", Volume IV, Starch, Academic Press, New York and London, 1964, Seite 127.The viscosity ηi - also called "intrinsic viscosity" - of starch becomes the relative viscosity ηrel according to the following equation 711 = (2.303 x log ηrel) / concentration
calculated. The concentration is given in g / 100 ml. The relative viscosity of the digested starch solutions is determined in 1% by weight aqueous solutions using a capillary viscometer at 25 ° C. and a pH of 3.5, the relative viscosity being determined from the corrected throughput times for solvents t o and solution ti according to the following equation
calculated. The conversion to 71i is carried out according to the relationship given above on the basis of the information in “Methods in Carbohydrate Chemistry”, Volume IV, Starch, Academic Press, New York and London, 1964, page 127.
Zur Herstellung der feinteiligen Copolymerisat-Dispersionen bereitet man zunächst eine wäßrige Lösung, die 1,5 bis 25, vorzugsweise 1,7 bis 21 Gew.% einer abgebauten Stärke mit einer Viskosität ηi von 0,04 bis 0,50 dl/g gelöst enthält. Abgebaute Stärken mit einer Viskosität in dem Bereich von 0,3 bis 0,5 dl/g werden vorzugsweise dann eingesetzt, wenn man Dispersionen mit einem niedrigen Feststoffgehalt herstellen will. Die abgebauten Stärken mit einer niedrigeren Viskosität, d.h. in dem Bereich von 0,04 bis etwa 0,3 dl/g, werden bevorzugt bei der Herstellung von Dispersionen mit höheren Feststoffgehalten, z.B. 25 bis 40 Gew.%, verwendet. Man kann auch Mischungen aus Stärken einer unterschiedlichen Viskosität 71i als Schutzkolloid einsetzen, jedoch muß die Viskosität der Mischung im angegebenen ηi-Bereich von 0,04 bis 0,50 dl/g liegen, d.h. es können in diesem Fall auch Stärkemischungen eingesetzt werden, in denen die Viskosität einer Stärkesorte außerhalb des angegebenen Bereichs liegt. Pro 100 Gewichtsteile einer solchen wäßrigen Stärkelösung unterwirft man 10 bis 56 Gewichtsteile einer Monomermischung aus den Komponenten (1) bis (3) der Copolymerisation. Die Monomeren können entweder in Form einer Mischung oder getrennt voneinander in die wäßrige Lösung der abgebauten Stärke einemulgiert werden. Um die Emulsion zu stabilisieren, kann man der wäßrigen Stärkelösung eine geringe Menge eines Emulgators zusetzen. Man kann jedoch auch die Monomeren mit Hilfe eines Emulgators zunächst in Wasser emulgieren und sie dann in Form der Emulsion zur wäßrigen Stärkelösung zugeben. Als Emulgatoren kommen hierfür Produkte mit anionischem oder kationischem Charakter in Betracht. Solche Emulgatoren sind beispielsweise Natriumalkylsulfonat, Natriumlaurylsulfat, Natriumdodecylbenzolsulfonat oder Dimethylalkylbenzylammoniumchlorid. Es ist empfehlenswert, bei anionischen Stärken anionische Emulgatoren, bei kationischen Stärken kationische Emulgatoren einzusetzen. Die Menge an Emulgator, die gegebenenfalls mitverwendet wird, beträgt 0 bis 0,3, vorzugsweise 0,05 bis 0,2 Gew.%, bezogen auf die Summe der eingesetzten Monomeren (1) bis (3). Vorzugsweise wird die Emulsionspolymerisation jedoch in Abwesenheit eines Emulgators durchgeführt.To prepare the finely divided copolymer dispersions, an aqueous solution is first prepared which contains 1.5 to 25, preferably 1.7 to 21% by weight of a degraded starch with a viscosity ηi of 0.04 to 0.50 dl / g dissolved . Degraded starches with a viscosity in the range of 0.3 to 0.5 dl / g are preferably used when it is desired to produce dispersions with a low solids content. The degraded starches with a lower viscosity, ie in the range from 0.04 to about 0.3 dl / g, are preferably used in the production of dispersions with higher solids contents, for example 25 to 40% by weight. Mixtures of starches of different viscosities 71i can also be used as protective colloids, but the viscosity of the mixture must be in the specified ηi range from 0.04 to 0.50 dl / g, ie starch mixtures can also be used in this case where the viscosity of a starch is outside the specified range. 10 to 56 parts by weight of a monomer mixture of components (1) to (3) are subjected to the copolymerization per 100 parts by weight of such an aqueous starch solution. The monomers can be emulsified either in the form of a mixture or separately from one another in the aqueous solution of the degraded starch. To stabilize the emulsion, a small amount of an emulsifier can be added to the aqueous starch solution. However, the monomers can also first be emulsified in water with the aid of an emulsifier and then added in the form of the emulsion to the aqueous starch solution. Products with anionic or cationic character are suitable as emulsifiers. Such emulsifiers are, for example, sodium alkyl sulfonate, sodium lauryl sulfate, sodium dodecylbenzenesulfonate or dimethylalkylbenzylammonium chloride. It is recommended to use anionic emulsifiers for anionic starches and cationic emulsifiers for cationic starches. The amount of emulsifier which is optionally used is 0 to 0.3, preferably 0.05 to 0.2% by weight, based on the sum of the monomers (1) to (3) used. However, the emulsion polymerization is preferably carried out in the absence of an emulsifier.
Die Copolymerisation der Monomeren in der wäßrigen Lösung der abgebauten Stärke wird bei Temperaturen von 40 bis 110, vorzugsweise 50 bis 100°C in Gegenwart eines Peroxidgruppen enthaltenden Initiators durchgeführt. Als Polymerisationsinitiator kommen in erster Linie Wasserstoffperoxid, Kombinationen von Wasserstoffperoxid mit einem Schwermetallsalz, z.B. Eisen-II-sulfat oder ein Redoxsystem aus Wasserstoffperoxid mit einem geeigneten Reduktionsmittel, wie Natriumformaldehydsulfoxylat, Ascorbinsäure, Natriumdisulfit und/oder Natriumdithionit in Betracht. Vorzugsweise verwendet man ein Redoxsystem aus Wasserstoffperoxid, einem Reduktionsmittel oder einer Mischung der genannten Reduktionsmittel und zusätzlich eine geringe Menge eines Schwermetallsalzes, wie beispielsweise Eisen-II-sulfat. Weitere geeignete Peroxidgruppen enthaltende Initiatoren sind beispielsweise organische Peroxide, Hydroperoxide und Peroxidisulfate. Geeignete Verbindungen dieser Art sind beispielsweise tert.-Butylhydroperoxid, Acetylcyclohexylsulfonylperoxid, Natriumperoxidisulfat, Kaliumperoxidisulfat oder Ammoniumperoxidisulfat.The copolymerization of the monomers in the aqueous solution of the degraded starch is carried out at temperatures from 40 to 110, preferably 50 to 100 ° C. in the presence of an initiator containing peroxide groups. Hydrogen peroxide, combinations of hydrogen peroxide with a heavy metal salt, e.g. Iron-II-sulfate or a redox system made of hydrogen peroxide with a suitable reducing agent, such as sodium formaldehyde sulfoxylate, ascorbic acid, sodium disulfite and / or sodium dithionite. A redox system of hydrogen peroxide, a reducing agent or a mixture of the reducing agents mentioned and, in addition, a small amount of a heavy metal salt, such as, for example, iron (II) sulfate, are preferably used. Other suitable initiators containing peroxide groups are, for example, organic peroxides, hydroperoxides and peroxydisulfates. Suitable compounds of this type are, for example, tert-butyl hydroperoxide, acetylcyclohexylsulfonyl peroxide, sodium peroxydisulfate, potassium peroxydisulfate or ammonium peroxydisulfate.
Während der Polymerisation ist für eine gute Durchmischung der Komponenten zu sorgen. So wird das Reaktionsgemisch vorzugsweise während der gesamten Dauer der Polymerisation und einer sich gegebenenfalls daran anschließenden Nachpolymerisation zur Erniedrigung des Restmonomerengehaltes gerührt. Die Polymerisation wird unter Ausschluß von Sauerstoff in einer Inertgasatmosphäre, z.B. unter Stickstoff, durchgeführt. Um die Polymerisation zu starten, entfernt man zunächst den Sauerstoff aus der wäßrigen Lösung der Stärke sowie aus den Monomeren und gibt zunächst 1 bis 40 % der zu polymerisierenden Monomeren zu der wäßrigen Lösung der Stärke und emulgiert durch Rühren der Reaktionsmischung die Monomeren darin. Durch vorhergehende, gleichzeitige oder nachträgliche Zugabe einer wäßrigen Initiatorlösung beginnt - in aller Regel nach einer kurzen Induktionsperiode - die Polymerisation. Dabei kann die zu Beginn der Polymerisation entstehende Polymerisationswärme dazu verwendet werden, um das Reaktionsgemisch zu erwärmen. Die Temperatur kann dabei bis auf 90 C ansteigen. Sobald die vorgelegten Monomeren polymerisiert sind, wird der Rest der Monomeren und der Initiatorlösung kontinuierlich oder portionsweise zugefügt und unter Rühren polymerisiert. Die Copolymerisation kann jedoch auch diskontinuierlich oder kontinuierlich vorgenommen werden. Man erhält eine feinteilige, wäßrige Dispersion, bei der die Copolymerisatteilchen von einer Schutzkolloidhülle auf Basis einer abgebauten Stärke umgeben sind. Ein Maß für die Feinteiligkeit der Dispersion ist der LD-Wert (Lichtdurchlässigkeitswert der Dispersion). Der LD-Wert wird gemessen, indem man die Dispersion in 0,01 gew.%iger wäßriger Lösung in einer Küvette einer Kantenlänge von 2,5 cm mit Licht der Wellenlänge 546 nm vermißt und mit der Durchlässigkeit von Wasser unter den vorstehend genannten Bedingungen vergleicht. Die Durchlässigkeit von Wasser wird dabei mit 100 % angegeben. Je feinteiliger die Dispersion ist, desto höher ist der LD-Wert, der nach der oben beschriebenen Methode gemessen wird.The components must be thoroughly mixed during the polymerization. For example, the reaction mixture is preferably stirred for the entire duration of the polymerization and any subsequent polymerization, if appropriate, to lower the residual monomer content. The polymerization is carried out in the absence of oxygen in an inert gas atmosphere, for example under nitrogen. In order to start the polymerization, the oxygen is first removed from the aqueous solution of the starch and from the monomers and first 1 to 40% of the monomers to be polymerized are added to the aqueous solution of the starch and the monomers therein are emulsified by stirring the reaction mixture. The polymerisation begins, as a rule after a short induction period, by adding an aqueous initiator solution beforehand, simultaneously or subsequently. The heat of polymerization which arises at the beginning of the polymerization can be used to heat the reaction mixture. The temperature can rise to 90 ° C. As soon as the submitted monomers are polymerized, the rest of the monomers and the initiator solution are added continuously or in portions and polymerized with stirring. However, the copolymerization can also be carried out batchwise or continuously. A finely divided, aqueous dispersion is obtained in which the copolymer particles are surrounded by a protective colloid shell based on a degraded starch. A measure of the fine particle size of the dispersion is the LD value (light transmission value of the dispersion). The LD value is measured by measuring the dispersion in 0.01% by weight aqueous solution in a cuvette with an edge length of 2.5 cm with light of the wavelength 546 nm and comparing it with the permeability of water under the conditions mentioned above . The permeability of water is given as 100%. The more finely divided the dispersion, the higher the LD value, which is measured using the method described above.
Die mittlere Teilchengröße der Copolymerisatteilchen ohne die Schutzkolloidhülle aus abgebauter Stärke kann ermittelt werden, wenn man die Stärkehülle der Latexteilchen praktisch vollständig enzymatisch abbaut. Eine mögliche Koagulation der Copolymerisat-Dispersion kann dabei durch Zusatz eines geeigneten Emulgators verhindert werden. Nach dem enzymatischen Abbau kann dann die Teilchengröße der Copolymerisatdispersion mit handelsüblichen Geräten gemessen werden, z.B. mit Hilfe des Nanosizers der Firma Coulter Electronics. Der mittlere Durchmesser der Copolymerisatteilchen ohne die Schutzkolloidhülle beträgt 75 bis 110 nm.The average particle size of the copolymer particles without the protective colloid shell from degraded starch can be determined if the starch shell of the latex particles is virtually completely enzymatically degraded. Possible coagulation of the copolymer dispersion can be prevented by adding a suitable emulsifier. After enzymatic degradation, the particle size of the copolymer dispersion can then be measured using commercially available devices, e.g. with the help of the Nanosizer from Coulter Electronics. The average diameter of the copolymer particles without the protective colloid shell is 75 to 110 nm.
Die wäßrigen Polymerdispersionen der Komponente b) werden in allen Fällen mit einer solchen Zusammensetzung hergestellt, daß die Polymerisate eine Glasübergangstemperatur von 5 bis 80, vorzugsweise 15 bis 60 °C haben. Die Konzentration des Polymerisats in der wäßrigen Dispersion beträgt 15 bis 55, vorzugsweise 20 bis 45 Gew.%. Die Beschichtungsmittel enthalten, bezogen auf die Feststoffe der Dispersion 5 bis 70, vorzugsweise 8 bis 30 Gew.-Teile der Komponente b), bezogen auf 100 Gew.-Teile eines feinteiligen Pigments oder einer Mischung von Pigmenten. Vorzugsweise werden 5 bis 30 Gew.% des Polymerisats der Komponente b) oder einer Mischung von Polymerisaten der Komponente b) durch mindestens ein wasserlösliches Polysaccharid ersetzt. Geeignete wasserlösliche Polysaccharide sind wasserlösliche Stärken, Carboxymethylcellulose, Methylcellulose, Hydroxyethylcellulose und Galactomannane.In all cases, the aqueous polymer dispersions of component b) are prepared with a composition such that the polymers have a glass transition temperature of 5 to 80, preferably 15 to 60 ° C. The concentration of the polymer in the aqueous dispersion is 15 to 55, preferably 20 to 45,% by weight. The coating compositions contain, based on the solids of the dispersion, 5 to 70, preferably 8 to 30, parts by weight of component b), based on 100 parts by weight of a finely divided pigment or a mixture of pigments. 5 to 30% by weight of the polymer of component b) or a mixture of polymers of component b) are preferably replaced by at least one water-soluble polysaccharide. Suitable water-soluble polysaccharides are water-soluble starches, carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose and galactomannans.
Als Komponente c) der Beschichtungsmittel kommen oberflächenaktive Stoffe und/oder polymere Dispergiermittel in Betracht, die jeweils die Ausbildung der Oberflächenleimung durch das Oberfiächenleimungsmittel b) stören bzw. verhindern. Die oberflächenaktiven Stoffe und die polymeren Dispergiermittel verbessern die Benetzbarkeit des Papiers mit Wasser. Geeignete oberflächenaktive Verbindungen haben einen HLB-Wert von mindestens 10 (zur Definition des HLB-Wertes vgl. W.C. Griffin, J. Cosmetic Chemist, Band 5, 311 (1954). Die in Betracht kommenden oberflächenaktiven Stoffe sind beispielsweise als Tensidklassen im Tensid-Taschenbuch von Dr. Stachel, Carl-Hanser-Verlag, München-Wien, 2. Auflage 1981, Seiten 4 bis 10, aufgelistet. Man kann sowohl nichtionische, anionische als auch kationische Tenside einsetzen. Produkte dieser Art werden beispielsweise durch Anlagerung von Ethylenoxid und/oder Propylenoxid an 8 bis 22 Kohlenstoffatome enthaltende Alkohole, Phenole, Amine und Fettsäuren erhalten. Von besonderem Interesse aus dieser Gruppe von Verbindungen sind beispielsweise die Anlagerungsprodukte von 10 bis 50 Mol Ethylenoxid an 1 Mol Dodecanol, C9C13-Alkohole und Nonylphenol. Von den anionischen Tensiden kommt vor allem als Komponente c) Natriumlaurylsulfonat in Betracht.As component c) of the coating compositions, surface-active substances and / or polymeric dispersants come into consideration, each of which disrupt or prevent the formation of surface sizing by the surface sizing agent b). The surface-active substances and the polymeric dispersants improve the wettability of the paper with water. Suitable surface-active compounds have an HLB value of at least 10 (for a definition of the HLB value, see WC Griffin, J. Cosmetic Chemist, Volume 5, 311 (1954). The surface-active substances in question are, for example, as surfactant classes in the Tensid-Taschenbuch by Dr. Stachel, Carl-Hanser-Verlag, Munich-Vienna, 2nd edition 1981, pages 4 to 10. Nonionic, anionic as well as cationic surfactants can be used. Products of this type are produced, for example, by the addition of ethylene oxide and / or alcohols, phenols, amines and fatty acids containing 8 to 22 carbon atoms are of particular interest from this group of compounds are, for example, the adducts of 10 to 50 moles of ethylene oxide with 1 mole of dodecanol, C 9 C 13 alcohols and nonylphenol the anionic surfactants come primarily into consideration as component c) sodium lauryl sulfonate.
Geeignete polymere Dispergiermittel der Komponente c) sind beispielsweise Polymerisate ethylenisch ungesättigter C3- bis Cs-Carbonsäuren mit einem K-Wert von 10 bis 50 (gemessen in 1 %iger wäßriger Lösung bei 25 * C und pH 8 am Natriumsalz der Polymerisate), Polymerisate von Acrylamid, Methacrylamid und Vinylpyrrolidon mit einem K-Wert von 10 bis 60, Polyvinylalkohole mit einem Molekulargewicht von 2.000 bis 200.000, Ligninsulfonate, Phenol-Formaldehyd-Kondensationsprodukte. Harnstoff-Formaldehyd-Kondensationsprodukte, Melamin-Formaldehyd-Kondensationsprodukte, sulfonierte. aromatische Formaldehydkondensationsprodukte, Polyamidoamine, handelsübliche Polyethylenimine und Polydiallyldimethylaminochloride mit einem Molekulargewicht von 2.000 bis 200.000.Suitable polymeric dispersant of component c) are for example polymers of ethylenically unsaturated C 3 - to Cs-carboxylic acids having a K-value of 10 measured to 50 (in 1% aqueous solution at 25 * C and pH 8 on the sodium salt of the polymers), polymers of acrylamide, methacrylamide and vinyl pyrrolidone with a K value of 10 to 60, polyvinyl alcohols with a molecular weight of 2,000 to 200,000, lignin sulfonates, phenol-formaldehyde condensation products. Urea-formaldehyde condensation products, melamine-formaldehyde condensation products, sulfonated. aromatic formaldehyde condensation products, polyamidoamines, commercially available polyethyleneimines and polydiallyldimethylaminochlorides with a molecular weight of 2,000 to 200,000.
Als polymeres Dispergiermittel der Komponente c) verwendet man vorzugsweise Homopolymerisate der Acrylsäure oder der Methacrylsäure mit einem K-Wert von 10 bis 40 (gemessen in 1 gew.%iger wäßriger Lösung bei 25 °C und pH 8 am Na-Salz der Polymerisate). Ein Verfahren zur Herstellung solcher Polymerisate ist beispielsweise aus der US-PS 4 301 266 bekannt. Außer den genannten Homopolymerisaten werden in der bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens auch Copolymerisate aus Acrylsäure und/oder Methacrylsäure mit Acrylamidomethylpropansulfonsäuren eingesetzt. Copolymerisate dieser Art sind beispielsweise aus der US-PS 4 450 013 als Dispergiermittel und Mahlhilfsmittel für Pigmente bekannt. Bevorzugte, zur Anwendung gelangende Copolymerisate enthalten 5 bis 60 Gew.% Acrylamidomethylpropansulfonsäure einpolymerisiert und haben einen K-Wert in dem Bereich von 12 bis 35 (gemessen am Na-Salz in 1 %iger wäßriger Lösung bei pH 8). Selbstverständlich können auch Copolymerisate aus Acrylsäure und Methacrylsäure, die die Monomeren in jedem beliebigen Verhältnis einpolymerisiert enthalten und einen K-Wert in dem Bereich von 10 bis 50 haben, oder Homopolymerisate von Acrylamido-2-methylpropansulfonsäure mit K-Werten von 10 bis 35, als polymeres Dispergiermittel der Komponente c) eingesetzt werden.As the polymeric dispersant of component c), preference is given to using homopolymers of acrylic acid or methacrylic acid with a K value of 10 to 40 (measured in 1% by weight aqueous solution at 25 ° C. and pH 8 on the sodium salt of the polymers). A method of making such Polymers are known, for example, from US Pat. No. 4,301,266. In addition to the homopolymers mentioned, copolymers of acrylic acid and / or methacrylic acid with acrylamidomethylpropanesulfonic acids are also used in the preferred embodiment of the process according to the invention. Copolymers of this type are known, for example, from US Pat. No. 4,450,013 as dispersants and grinding aids for pigments. Preferred copolymers used contain 5 to 60% by weight of copolymerized acrylamidomethylpropanesulfonic acid and have a K value in the range from 12 to 35 (measured using the Na salt in a 1% strength aqueous solution at pH 8). Of course, copolymers of acrylic acid and methacrylic acid, which contain the monomers copolymerized in any ratio and have a K value in the range from 10 to 50, or homopolymers of acrylamido-2-methylpropanesulfonic acid with K values from 10 to 35, as polymeric dispersant of component c) are used.
Die erfindungsgemäß anzuwendenden Beschichtungsmittel werden durch Mischen der einzelnen Komponenten a) bis c) erhalten. Man kann beispielsweise die Pigmente in die wäßrige kationische Polymerdispersion eines Papierleimungsmittels eintragen und dann mindestens eine der gemäß c) in Betracht kommenden Verbindungen zusetzen oder auch so verfahren, daß man zunächst durch Mischen der Komponenten a) und c) eine wäßrige Pigmentanschlämmung herstellt, deren Feststoffkonzentration beispielsweise in dem Bereich von 40 bis 85 Gew.% beträgt und die so erhaltene wäßrige Pigmentanschlämmung dann mit mindestens einer kationischen wäßrigen Polymerdispersion eines Papierleimungsmittels mischt. Besonders bevorzugt ist eine Arbeitsweise, bei der wäßrige Anschlämmungen von Pigmenten eingesetzt werden, die durch Mahlen und Dispergieren der Pigmente in Gegenwart von Polymerisaten ethylenisch ungesättigter C3- bis Cs-Carbonsäuren mit einem K-Wert von 10 bis 50 (gemessen in 1 %iger wäßriger Lösung bei 25° C und pH 8 am Na-Salz des Polymerisats) erhältlich sind. In diesen Fällen verwendet man als Pigment vorzugsweise Kalziumcarbonat oder Kreide und als polymeres Dispergiermittel Polyacrylsäure oder ein Copolymerisat aus Acrylsäure und Acrylamidomethylpropansulfonsäure mit einem K-Wert von 10 bis 30 (gemessen als Na-Salz wie oben angegeben). Man erhält auf diese Weise besonders feinteilige Pigmentanschlämmungen mit einer Teilchengröße der dispergierten Teilchen von ca. 90 % <2 j.l.m. Derartige Pigmentanschlämmungen haben selbst in hohen Konzentrationen, z.B. bei Feststoffgehalten zwischen 60 und 80 Gew.%, noch eine solche Viskosität, daß die Anschlämmungen leicht zu handhaben sind. Diese Pigmentanschlämmungen werden dann noch mit mindestens einer kationischen wäßrigen Polymerdispersion gemäß b) gemischt. Die Beschichtungsmittel, die dann auf die Oberfläche des Papiers aufgetragen werden, haben einen Feststoffgehalt in dem Bereich von 5 bis 60, vorzugsweise 15 bis 35 Gew.%. Der pH-Wert der Beschichtungsmittel liegt in dem Bereich von 5 bis 10.The coating compositions to be used according to the invention are obtained by mixing the individual components a) to c). For example, the pigments can be introduced into the aqueous cationic polymer dispersion of a paper sizing agent and then at least one of the compounds suitable according to c) can be added, or the procedure can be followed such that an aqueous pigment slurry, the solids concentration of which is first prepared by mixing components a) and c) is, for example, in the range from 40 to 85% by weight and the aqueous pigment slurry thus obtained is then mixed with at least one cationic aqueous polymer dispersion of a paper sizing agent. A method of operation is particularly preferred in which aqueous slurries of pigments are used, which are obtained by grinding and dispersing the pigments in the presence of polymers of ethylenically unsaturated C 3 to Cs carboxylic acids with a K value of 10 to 50 (measured in 1% strength) aqueous solution at 25 ° C and pH 8 on the sodium salt of the polymer) are available. In these cases, calcium carbonate or chalk is preferably used as the pigment and polyacrylic acid or a copolymer of acrylic acid and acrylamidomethylpropanesulfonic acid with a K value of 10 to 30 (measured as Na salt as stated above) is used as the polymeric dispersant. This gives particularly fine-particle pigment slurries with a particle size of the dispersed particles of approximately 90% <2 μm. Such pigment slurries, even in high concentrations, for example at solids contents between 60 and 80% by weight, still have a viscosity such that the slurries are light are to be handled. These pigment slurries are then mixed with at least one cationic aqueous polymer dispersion according to b). The coating compositions which are then applied to the surface of the paper have a solids content in the range from 5 to 60, preferably 15 to 35% by weight. The pH of the coating compositions is in the range from 5 to 10.
Die Beschichtungsmittel werden entweder ein- oder beidseitig auf Papier aufgebracht. Der Auftrag der Beschichtungsmittel erfolgt vorzugsweise kontinuierlich mit Hilfe bekannter Vorrichtungen, wie sie in der Papierstreicherei verwendet werden, z.B. Blade, Speed-Sizer und Short-dwell-coater. Die Papierbahn wird dabei mit einer Geschwindigkeit von mehr als 750 m/min, vorzugsweise 1000 bis 1400 m/min durch das Beschichtungsaggregat geführt. Diese hohen Geschwindigkeiten bei der Beschichtung erlauben es, die Beschichtung des Papiers unmittelbar mit der Papierherstellung zu koppeln und eine Beschichtungseinheit in eine Papiermaschine zu integrieren. Man erhält dann direkt ein Naturpapier, das beispielsweise im Offset-Druck und Tiefdruck und als Zeitungsdruckpapier verwendet werden kann.The coating compositions are applied to paper on one or both sides. The coating compositions are preferably applied continuously using known devices such as those used in paper coating, e.g. Blade, speed sizer and short dwell coater. The paper web is guided through the coating unit at a speed of more than 750 m / min, preferably 1000 to 1400 m / min. These high coating speeds make it possible to couple the coating of the paper directly with the paper production and to integrate a coating unit into a paper machine. A natural paper is then directly obtained, which can be used, for example, in offset printing and gravure printing and as newsprint.
Bei den hohen Arbeitsgeschwindigkeiten erhält man einen Auftrag an Beschichtungsmittel von 0,5 bis 4, vorzugsweise 1 bis 2,5 g/m2. Infolge dieses gegenüber dem üblichen Verfahren zum Streichen von Papier wesentlich geringeren Auftrags an Beschichtungsmittel ist auch die Herstellung relativ leichter Papiere, die eine gute Bedruckbarkeit aufweisen, möglich.At the high working speeds, an application of coating agent of 0.5 to 4, preferably 1 to 2.5 g / m 2 is obtained . As a result of this application of coating agent, which is considerably less than the conventional process for coating paper, it is also possible to produce relatively light papers which have good printability.
Die in den Beispielen angegebenen Teile sind Gewichtsteile, die Angaben in Prozet bedeuten Gew.%. Die K-Werte wurden nach H.Fikentscher, Cellulose Chemie, Band 13, 48 bis 64 und 71 bis 74 (1932) in wäßriger Lösung bei einem pH-Wert von 8, einer Temperatur von 25. C und einer Polymerkonzentration von 1 % des Natriumsalzes des Copolymerisats bestimmt; dabei bedeutet K = k' 103. Die relative Viskosität wurde an 1 gew.%igen wäßrigen Lösungen bei 25 C und einem pH von 3,5 mit Hilfe eines Kapillar-Viskosimeters gemessen. Die Intrinsic-Viskosität wurde aus der relativen Viskosität nach der oben angegebenen Formel berechnet.The parts given in the examples are parts by weight, the percentages are percentages by weight. The K values were determined according to H. Fikentscher, Cellulose Chemie, Vol. 13, 48 to 64 and 71 to 74 (1932) in aqueous solution at a pH of 8 and a temperature of 25 . C and a polymer concentration of 1% of the sodium salt of the copolymer determined; where K = k '10 3 . The relative viscosity was measured in 1% by weight aqueous solutions at 25 ° C. and a pH of 3.5 using a capillary viscometer. The intrinsic viscosity was calculated from the relative viscosity using the formula given above.
Die Bedruckbarkeitseigenschaften der beschichteten Papiere wurden anhand der Weiße, Helligkeit, Opazität, des Durchschlagens und des Durchscheinens beurteilt. Für die Bestimmung der Weiße wurde der Reflektionsfaktor nach DIN 53145 gemessen. Die Bestimmung der Opazität erfolgte nach DIN 53146. Die übrigen Kriterien wurden nach folgenden Methoden bestimmt:The printability properties of the coated papers were assessed on the basis of whiteness, brightness, opacity, bleed through and translucency. To determine the whiteness, the reflection factor was measured in accordance with DIN 53145. The opacity was determined in accordance with DIN 53146. The other criteria were determined using the following methods:
- Gerät: Elrepho MeßgerätDevice: Elrepho measuring device
- Filter: FMY/CFilter: FMY / C
Für diese Messung werden so viele unbedruckte Blätter (mit der gleichen Seite nach oben zeigend) auf einer schwarzen Samtunterlage übereinandergelegt. daß der abzulesende Wert sich nicht mehr durch Hinzufügen weiterer Blätter verändern läßt (Unendlichkeitsmessung). Je nach Größe der Papierbögen bekommt man mit 3 bis 5 Einzelmessungen einen repräsentativen Mittelwert. Die Ergebnisse werden als Reflexionswerte in Prozent, bezogen auf den Weißestandard nach DIN 53 145, angegeben. Die Helligkeitsmessung beruht auf dem gleichen Prinzip wie die Weißgradmessung (DIN 53145).For this measurement, so many unprinted sheets (with the same side facing up) are placed on a black velvet surface. that the value to be read can no longer be changed by adding more sheets (infinity measurement). Depending on the size of the paper sheets, you get a representative average with 3 to 5 individual measurements. The results are given as reflection values in percent, based on the white standard according to DIN 53 145. The brightness measurement is based on the same principle as the whiteness measurement (DIN 53145).
- Gerät für den Druck : Haindl TiefdruckgerätDevice for printing: Haindl gravure device
- Gerät für die Messung : Elrepho MeßgerätDevice for measurement: Elrepho measuring device
- Filter für die Messung: FMY/CMeasurement filter: FMY / C
- X = Helligkeit verdecktX = brightness hidden
- Y = Helligkeit Vollton Rückseite,Y = back spot full tone brightness,
- Z = Helligkeit im StapelZ = brightness in the stack
Messung X:
- Ein bedruckter Bogen wird mit einem unbedruckten gleicher Versuchsreihe derart abgedeckt, daß die zwei gleichen Seiten aufeinander liegen (z.B. Siebseite unbedruckt auf Siebgeräte bedruckt). Gemessen wird über dem großen, rechteckigen Volltonfeld ohne schwarze Samtunterlage. Üblicherweise gibt man den Mittelwert aus 3 Einzelmessungen pro Bogen an, wobei die Meßwerte als Reflexionswerte in Prozent, bezogen auf den Weißestandard nach DIN 53 145, angegeben werden.
- A printed sheet is covered with an unprinted, identical test series in such a way that the two identical sides lie on one another (for example, the printed side is printed unprinted on screening devices). Measurements are taken over the large, rectangular solid field without a black velvet pad. Usually the average of 3 individual measurements per sheet is given, the measurement values being given as reflection values in percent, based on the white standard according to DIN 53 145.
Messung Y:
- Ein bedruckter Bogen wird von der Rückseite her über dem großen rechteckigen Volltonfeld, ebenfalls ohne schwarze Samtunterlage, gemessen. Es wird gleich falls der Mittelwert aus 3 Einzelmessungen angegeben. Auch bei dieser Messung sind die Werte als Reflexionswerte in Prozent, bezogen auf den Weißestandard nach DIN 53 145, angegeben.
- A printed sheet is measured from the back over the large rectangular solid field, also without a black velvet pad. The average of 3 individual measurements is also given. In this measurement too, the values are given as reflectance values in percent, based on the white standard according to DIN 53 145.
Berechnung für das Durchschlagen:
DurchscheinenCalculation for strikethrough:
To shine through
Messungen und Geräte: siehe oben unter DurchschlagenMeasurements and devices: see above under breakdown
Berechnung für das Durchscheinen:
Der Leimungsgrad der Papiere wurde mit Hilfe des Cobb-Wertes (60 sec) nach DIN 53132 und der Tintenschwimmzeit bis zum 50 %igen Durchschlag mit einer Normtinte nach DIN 53 126 ermittelt.Calculation for shining through:
The degree of sizing of the papers was determined with the aid of the Cobb value (60 sec) according to DIN 53132 and the ink swimming time up to 50% breakthrough with a standard ink according to DIN 53 126.
Gemäß der Lehre der DE-PS 16 96 326 wird durch Copolymerisation von 20 Gew.-Teilen eines mit Dimethylsulfat quaternierten N-Vinylimidazols, 26 Teilen Acrylnitril und 54 Teilen n-Butylacrylat, eine 40 %ige kationische Polymerdispersion hergestellt, die einen LD-Wert von 84 hat.According to the teaching of DE-PS 16 96 326, a 40% cationic polymer dispersion which has an LD value is prepared by copolymerization of 20 parts by weight of a N-vinylimidazole quaternized with dimethyl sulfate, 26 parts of acrylonitrile and 54 parts of n-butyl acrylate out of 84.
In einem Polymerisationsgefäß, das mit Rührer, Dosiervorrichtungen und einer Einrichtung für das Arbeiten unter Stickstoff ausgestattet ist, werden unter Rühren 20,7 Teile einer 82 %igen wäßrigen kationischen Kartoffelstärke (ηi = 0,1 dl/g, Substitutionsgrad 0,025 mol Stickstoff pro Mol Glycoseeinheit) in 133 Gew.-Teilen Wasser bei 85 °C gelöst. Man fügt 3,7 Teile Eisessig und 0,03 Teile Eisensulfat (FeS04.7H20) zu, gibt dann 0,8 Teile 30 %iges Wasserstoffperoxid zu und nach 20 Minuten 0,8 g 30 %iges Wasserstoffperoxid. Man dosiert dann innerhalb von 2 Stunden eine Emulsion von 44 Teilen n-Butylacrylat und 39 Teilen Styrol in einer Lösung von 0,045 Teilen Natriumlaurylsulfat in 29 Teilen Wasser und gleichbeginnend damit aus einem zweiten Zulaufgefäß 14 Teile einer 5,5 %igen Wasserstoffperoxidlösung. Nach Beendigung der Monomeren- und der Wasserstoffperoxid-Zugabe wird das Reaktionsgemisch noch eine Stunde bei 85 C nachpolymerisiert. Man erhält eine kationische Dispersion mit einem Feststoffgehalt von 34 % und einem LD-Wert von 86.20.7 parts of an 82% strength aqueous cationic potato starch (ηi = 0.1 dl / g, degree of substitution 0.025 moles of nitrogen per mole) are stirred into a polymerization vessel equipped with a stirrer, metering devices and a device for working under nitrogen Glycose unit) dissolved in 133 parts by weight of water at 85 ° C. 3.7 parts of glacial acetic acid and 0.03 parts of iron sulfate (FeS0 4 .7H 2 0) are added, then 0.8 parts of 30% hydrogen peroxide are added, and after 20 minutes 0.8 g of 30% hydrogen peroxide. An emulsion of 44 parts of n-butyl acrylate and 39 parts of styrene in a solution of 0.045 parts of sodium lauryl sulfate in 29 parts of water is then metered in over the course of 2 hours, and 14 parts of a 5.5% strength hydrogen peroxide solution from a second feed vessel. After the monomer and hydrogen peroxide addition have ended, the reaction mixture is polymerized for a further hour at 85.degree. A cationic dispersion with a solids content of 34% and an LD value of 86 is obtained.
In einem 1-1-Vierhalskolben, der mit Rührer, Rückflußkühler, Dosiervorrichtungen und einer Einrichtung zum Arbeiten unter Stickstoffatmosphäre ausgestattet ist, werden 148 g Wasser und 34,0 g der im folgenden beschriebenen Stärke I sowie 8,4 g der im folgenden ebenfalls charakterisierten Stärke II vorgelegt und unter Rühren auf eine Temperatur von 85 C erhitzt. Bei der Stärke I handelt es sich um eine abgebaute, kationische Kartoffelstärke mit einer Intrinsic-Viskosität ηi von 0,47 dl/g, einem Substitutionsgrad von 0,027 Mol Stickstoff pro Mol Glykoseeinheit sowie 0,015 Mol COOH-Gruppen pro Mol Glykoseeinheit. Der Feststoffgehalt der Stärke beträgt 83 %. Bei der Stärke II handelt es sich um eine abgebaute, kationische Kartoffelstärke mit einer Intrinsic-Viskosität ηi von 1,16 dl/g mit einem Substitutionsgrad von 0,07 Mol Stickstoff pro Mol Glykoseeinheit. Der Feststoffgehalt der Stärke beträgt 83 %.In a 1-1 four-necked flask equipped with a stirrer, reflux condenser, metering devices and a device for working under a nitrogen atmosphere, 148 g of water and 34.0 g of starch I described below and 8.4 g of the following are also characterized Starch II presented and heated to a temperature of 85 C with stirring. Starch I is a degraded, cationic potato starch with an intrinsic viscosity ηi of 0.47 dl / g, a degree of substitution of 0.027 mol nitrogen per mol glycose unit and 0.015 mol COOH groups per mol glycose unit. The solids content of the starch is 83%. Starch II is a degraded, cationic potato starch with an intrinsic viscosity ηi of 1.16 dl / g with a degree of substitution of 0.07 mole nitrogen per mole glycose unit. The solids content of the starch is 83%.
Nach 30 minütigem Rühren bei 85 C werden 2,6 g einer wäßrigen 10 %igen Kalziumacetatlösung und 10 g einer 1 %igen Enzymlösung (a-Amylase A) zugefügt. Nach weiteren 20 Minuten bei 85 C wird der enzymatische Stärkeabbau durch Zugabe von 7,5 g Eisessig abgestoppt. Anschließend werden 16,5 g einer 1 %igen Eisen(II)sulfatlösung und 1,75 g 30 %iges Wasserstoffperoxid zugesetzt. Nach 20 Minuten ist das Wasserstoffperoxid zersetzt und der oxidative Stärkeabbau beendet. Die Intrinsic-Viskosität der Stärkemischung beträgt dann 0,08 dl/g. Man gibt dann 1,8 g 30 %iges Wasserstoffperoxid zu und beginnt sofort damit, eine Emulsion, die aus 93,7 g Acrylnitril, 76,4 g n-Butylacrylat und einer Lösung von 0,2 g Natrium-C14-Alkylsulfonat in 50 g Wasser besteht, gleichmäßig innerhalb einer Stunde sowie gleichzeitig separat davon 50 g einer 3,12 %igen Wasserstoffperoxidlösung innerhalb von 1,75 Stunden zuzufügen. Während dieser Zeit und noch 60 Minuten nach dem Ende der Monomer- und Wasserstoffperoxiddosierung wird die Temperatur des Reaktionsgemisches auf 85 C gehalten. Es resultiert eine kationische Dispersion mit einem Feststoffgehalt von 40,5 % und einem LD-Wert von 82 (Teilchendurchmesser ohne Stärkehülle, 143 nm).After stirring at 85 ° C. for 30 minutes, 2.6 g of an aqueous 10% calcium acetate solution and 10 g of a 1% enzyme solution (α-amylase A) are added. After a further 20 minutes at 85 C, the enzymatic starch breakdown is stopped by adding 7.5 g of glacial acetic acid. Then 16.5 g of a 1% iron (II) sulfate solution and 1.75 g of 30% hydrogen peroxide are added. After 20 minutes the hydrogen peroxide has decomposed and the oxidative starch degradation has ended. The intrinsic viscosity of the starch mixture is then 0.08 dl / g. 1.8 g of 30% hydrogen peroxide are then added, and an emulsion consisting of 93.7 g of acrylonitrile, 76.4 g of n-butyl acrylate and a solution of 0.2 g of sodium C 14 -alkyl sulfonate is immediately started 50 g of water consist of adding 50 g of a 3.12% strength hydrogen peroxide solution evenly within one hour and separately at the same time within 1.75 hours. During this time and 60 minutes after the end of the monomer and hydrogen peroxide metering, the temperature of the reaction mixture is kept at 85.degree. The result is a cationic dispersion with a solids content of 40.5% and an LD value of 82 (particle diameter without starch shell, 143 nm).
Durch Polymerisieren nach Art einer Emulsionspolymerisation bei 80 C wird eine anionische Copolymerisatdispersion hergestellt, indem man eine Emulsion von 66,3 Teilen n-Butylacrylat, 14 Teilen Acrylnitril, 15 Teilen Styrol und 4 Teilen Acrylsäure und gleichzeitig damit eine wäßrige Lösung von Kaliumperoxidisulfat in eine wäßrige Lösung von Natriumlaurylsulfonat dosiert und darin polymerisiert. Man erhält eine 50 %ige anionische Polymerdispersion mit einem LD-Wert von 72.Anionic copolymer dispersion is prepared by polymerizing in the manner of an emulsion polymerization at 80 ° C. by mixing an emulsion of 66.3 parts of n-butyl acrylate, 14 parts of acrylonitrile, 15 parts of styrene and 4 parts of acrylic acid and, at the same time, an aqueous solution of potassium peroxydisulfate in an aqueous solution Solution of sodium lauryl sulfonate metered and polymerized therein. A 50% anionic polymer dispersion with an LD value of 72 is obtained.
Entsprechend der Lehre der JP-OS 58/115196 werden in einem mit einem Rührer und einem Rückflußkühler versehenen 2-I-Kolben 500 Teile einer 6,6 %igen wäßrigen Lösung einer oxidativ abgebauten Kartoffelstärke vorgelegt. Die abgebaute Kartoffelstärke hat eine Intrinsic-Viskosität ηi; von 0,27 dl/g und einen Substitutionsgrad von 0,034 Mol Carboxylgruppen pro Mol Glukoseeinheit. Zu der auf 80 bis 90 C erwärmten Vorlage gibt man dann 44 Teile Styrol, 71,7 Teile n-Butylacrylat und 21,7 Teile tert.-Butylacrylat sowie 3 Teile Kaliumperoxidisulfat in 50 Teilen Wasser. Man erhält eine anionische Polymerdispersion mit einem Feststoffgehalt von 25 % und einem LD-Wert von 90.According to the teaching of JP-OS 58/115196 500 parts of a 6.6% aqueous solution of an oxidatively degraded potato starch are placed in a 2-liter flask provided with a stirrer and a reflux condenser. The degraded potato starch has an intrinsic viscosity ηi ; of 0.27 dl / g and a degree of substitution of 0.034 moles of carboxyl groups per mole of glucose unit. 44 parts of styrene, 71.7 parts of n-butyl acrylate and 21.7 parts of tert-butyl acrylate and 3 parts of potassium peroxydisulfate in 50 parts of water are then added to the template, which has been heated to 80 to 90 ° C. An anionic polymer dispersion with a solids content of 25% and an LD value of 90 is obtained.
In einem Kessel, der mit einem Rührer versehen ist, werden 100 kg des in der Tabelle angegebenen Pigments unter Zusatz von jeweils 0,5 kg des Natriumsalzes eines Homopolymerisats der Acrylsäure vom K-Wert 20 in 150 kg Wasser dispergiert. Separat davon wird jeweils eine wäßrige Stärkelösung hergestellt, die man durch Lösen von 6,7 kg einer kationischen bzw. oxidativ-abgebauten Stärke in 70 kg Wasser erhält. Die kationische Stärke hat eine Intrinsic-Viskosität ηi von 1,6 und einen Substitutionsgrad von 0,09 Mol Stickstoff pro Mol Glukoseeinheit. Die oxidativ abgebaute Stärke hat eine Intrinsik-Viskosität von ηi von 0,6 dl/g und einen Substitutionsgrad von 0,025 Mol COOH-Gruppen pro Mol Glukoseeinheit.In a kettle equipped with a stirrer, 100 kg of the pigment shown in the table are dispersed in 150 kg of water with the addition of 0.5 kg of the sodium salt of a homopolymer of acrylic acid with a K value of 20. An aqueous starch solution is prepared separately, which is obtained by dissolving 6.7 kg of a cationic or oxidatively degraded starch in 70 kg of water. The cationic starch has an intrinsic viscosity ηi of 1.6 and a degree of substitution of 0.09 moles of nitrogen per mole of glucose unit. The oxidatively degraded starch has an intrinsic viscosity of ηi of 0.6 dl / g and a degree of substitution of 0.025 moles of COOH groups per mole of glucose unit.
Man stellt dann jeweils die Beschichtungsmittel her, indem man zu der oben beschriebenen Mischung aus Pigmentanschlämmung und löslicher Stärke jeweils 33,3 kg, bezogen auf Polymerisat, der kationischen Dispersionen 1 bis 3 und der Vergleichsdispersionen 1 und 2 zusetzt. Durch Zugabe von jeweils 150 kg Wasser wird das Beschichtungsmittel auf einen Feststoffgehalt von ca. 25 Gew.% eingestellt.The coating compositions are then prepared in each case by adding 33.3 kg, based on the polymer, of the cationic dispersions 1 to 3 and of the comparative dispersions 1 and 2 to the mixture of pigment slurry and soluble starch described above. The coating agent is adjusted to a solids content of approx. 25% by weight by adding 150 kg of water in each case.
Mit den oben beschriebenen Beschichtungsmitteln wird jeweils ein Naturtiefdruckpapier eines Flächengewichts von 60 g/m2 in einer Technikums-Streichanlage mittels eines Blade-Auftragswerkes bei einer Geschwindigkeit der Papierbahn von 1000 m/min beidseitig gestrichen. Das Auftragsgewicht beträgt 1 g/m2 und Seite. Nach dem Auftragen des Beschichtungsmittels erfolgt jeweils ein Trocknen der beschichteten Papierbahn. Der Tabelle sind die jeweils verwendeten Beschichtungsmittel sowie die Eigenschaften der jeweils erhaltenen beschichteten Papiere angegeben. Man ersieht daraus, daß erfindungsgemäß eine beträchtliche Verbesserung der Bedruckbarkeit gegenüber den Vergleichsdispersionen erzielt wird.
Claims (10)
in einer Menge von 0,5 bis 4 g/m2 aufträgt.1. A process for improving the printability of paper by applying aqueous coating agents composed of pigments and binders to the surface of the paper on one or both sides and drying the coated paper, characterized in that a mixture of
in an amount of 0.5 to 4 g / m 2 .
nach Art einer Emulsionspolymerisation in 100 Gew.-Teilen einer wäßrigen Lösung, die 1,5 bis 25 Gew.% einer kationischen Stärke mit einer Viskosität ηi = 0,04 bis 0,50 dl g gelöst enthält, bei Temperaturen von 40 bis 100 C in Gegenwart eines Peroxidgruppen aufweisenden Initiators erhältlich sind.10. The method according to claim 7, characterized in that one uses as component b) polymer dispersions which by copolymerizing from 10 to 56 parts by weight of a monomer mixture
in the manner of an emulsion polymerization in 100 parts by weight of an aqueous solution which contains 1.5 to 25% by weight of a cationic starch with a viscosity ηi = 0.04 to 0.50 dl g, at temperatures of 40 to 100 ° C. are available in the presence of an initiator containing peroxide groups.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT88114757T ATE82783T1 (en) | 1987-09-15 | 1988-09-09 | METHOD OF IMPROVING THE PRINTABILITY OF PAPER. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873730887 DE3730887A1 (en) | 1987-09-15 | 1987-09-15 | METHOD FOR IMPROVING THE PRINTABILITY OF PAPER |
DE3730887 | 1987-09-15 |
Publications (3)
Publication Number | Publication Date |
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EP0307816A2 true EP0307816A2 (en) | 1989-03-22 |
EP0307816A3 EP0307816A3 (en) | 1990-12-12 |
EP0307816B1 EP0307816B1 (en) | 1992-11-25 |
Family
ID=6336006
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Application Number | Title | Priority Date | Filing Date |
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EP88114757A Expired - Lifetime EP0307816B1 (en) | 1987-09-15 | 1988-09-09 | Process for improving the printability of paper |
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US (1) | US4908240A (en) |
EP (1) | EP0307816B1 (en) |
JP (1) | JPH0197297A (en) |
KR (1) | KR890005349A (en) |
AT (1) | ATE82783T1 (en) |
AU (1) | AU603258B2 (en) |
CA (1) | CA1327146C (en) |
DE (2) | DE3730887A1 (en) |
DK (1) | DK510788A (en) |
ES (1) | ES2037165T3 (en) |
FI (1) | FI884196A (en) |
NO (1) | NO884078L (en) |
NZ (1) | NZ226157A (en) |
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US4304703A (en) * | 1980-06-23 | 1981-12-08 | Ppg Industries, Inc. | Cationic polymer dispersions and their method of preparation |
US4554181A (en) * | 1984-05-07 | 1985-11-19 | The Mead Corporation | Ink jet recording sheet having a bicomponent cationic recording surface |
FR2603042B1 (en) * | 1986-08-22 | 1988-11-10 | Coatex Sa | COMPLEX PIGMENT COMPOSITIONS FOR COATING PAPER |
-
1987
- 1987-09-15 DE DE19873730887 patent/DE3730887A1/en not_active Withdrawn
-
1988
- 1988-09-08 CA CA000576783A patent/CA1327146C/en not_active Expired - Fee Related
- 1988-09-09 AT AT88114757T patent/ATE82783T1/en not_active IP Right Cessation
- 1988-09-09 EP EP88114757A patent/EP0307816B1/en not_active Expired - Lifetime
- 1988-09-09 ES ES198888114757T patent/ES2037165T3/en not_active Expired - Lifetime
- 1988-09-09 DE DE8888114757T patent/DE3876192D1/en not_active Expired - Lifetime
- 1988-09-13 NZ NZ226157A patent/NZ226157A/en unknown
- 1988-09-13 FI FI884196A patent/FI884196A/en not_active Application Discontinuation
- 1988-09-14 AU AU22201/88A patent/AU603258B2/en not_active Ceased
- 1988-09-14 NO NO88884078A patent/NO884078L/en unknown
- 1988-09-14 JP JP63228915A patent/JPH0197297A/en active Pending
- 1988-09-14 DK DK510788A patent/DK510788A/en not_active Application Discontinuation
- 1988-09-15 US US07/244,679 patent/US4908240A/en not_active Expired - Fee Related
- 1988-09-15 KR KR1019880011981A patent/KR890005349A/en not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1546416A1 (en) * | 1964-06-05 | 1970-07-30 | Nat Starch Chem Corp | Paper coating slip made from water, neutral mineral pigment and binder |
US3671472A (en) * | 1968-10-07 | 1972-06-20 | Rohm & Haas | Mineral-coating compositions comprising an amine polymer and an amylaceous substance and papers coated therewith |
FR2182060A1 (en) * | 1972-04-26 | 1973-12-07 | Basf Ag |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19545182A1 (en) * | 1995-03-30 | 1996-10-02 | New Oji Paper Co Ltd | Coated paper for printing made by steaming and calendering initially coated paper |
DE19545182C2 (en) * | 1995-03-30 | 1998-09-17 | Oji Paper Co | Process for the production of coated paper |
EP1056783B2 (en) † | 1998-02-18 | 2015-06-24 | Kemira Germany GmbH | Fine-particle polymer dispersions for paper sizing |
US6835767B2 (en) | 2000-08-11 | 2004-12-28 | Basf Aktiengesellschaft | Polymer dispersions containing starch |
US7662871B2 (en) | 2002-04-24 | 2010-02-16 | Basf Aktiengesellschaft | Aqueous polymer dispersions, based on copolymers of vinyl aromatics and butadiene, method for their production and their use as sizing agents for paper |
WO2008071688A1 (en) * | 2006-12-14 | 2008-06-19 | Basf Se | Fine-particulate polymer dispersions comprising starch |
Also Published As
Publication number | Publication date |
---|---|
DK510788D0 (en) | 1988-09-14 |
AU603258B2 (en) | 1990-11-08 |
EP0307816A3 (en) | 1990-12-12 |
ES2037165T3 (en) | 1993-06-16 |
NO884078L (en) | 1989-03-16 |
KR890005349A (en) | 1989-05-13 |
EP0307816B1 (en) | 1992-11-25 |
DK510788A (en) | 1989-03-16 |
NZ226157A (en) | 1990-05-28 |
NO884078D0 (en) | 1988-09-14 |
AU2220188A (en) | 1989-03-16 |
FI884196A0 (en) | 1988-09-13 |
US4908240A (en) | 1990-03-13 |
JPH0197297A (en) | 1989-04-14 |
ATE82783T1 (en) | 1992-12-15 |
CA1327146C (en) | 1994-02-22 |
FI884196A (en) | 1989-03-16 |
DE3876192D1 (en) | 1993-01-07 |
DE3730887A1 (en) | 1989-03-23 |
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