US20090260769A1 - Method for treating cellulose-containing fibers or planar structures containing cellulose-containing fibers - Google Patents
Method for treating cellulose-containing fibers or planar structures containing cellulose-containing fibers Download PDFInfo
- Publication number
- US20090260769A1 US20090260769A1 US12/438,312 US43831207A US2009260769A1 US 20090260769 A1 US20090260769 A1 US 20090260769A1 US 43831207 A US43831207 A US 43831207A US 2009260769 A1 US2009260769 A1 US 2009260769A1
- Authority
- US
- United States
- Prior art keywords
- compounds
- radical
- cellulose
- atoms
- ketocarbonyl
- 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.)
- Abandoned
Links
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- 229920002678 cellulose Polymers 0.000 title claims description 47
- 239000000835 fiber Substances 0.000 title claims description 47
- 150000001875 compounds Chemical class 0.000 claims abstract description 105
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims abstract description 17
- 239000000758 substrate Substances 0.000 claims abstract description 6
- 150000003961 organosilicon compounds Chemical class 0.000 claims description 35
- 125000004432 carbon atom Chemical group C* 0.000 claims description 25
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 19
- 125000003277 amino group Chemical group 0.000 claims description 17
- 238000011282 treatment Methods 0.000 claims description 17
- 239000004215 Carbon black (E152) Substances 0.000 claims description 16
- 229930195733 hydrocarbon Natural products 0.000 claims description 16
- 229920001296 polysiloxane Polymers 0.000 claims description 13
- 229920000570 polyether Polymers 0.000 claims description 12
- 229920000642 polymer Polymers 0.000 claims description 12
- 239000007864 aqueous solution Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 10
- 229920000728 polyester Polymers 0.000 claims description 8
- 229920001577 copolymer Polymers 0.000 claims description 7
- 125000005842 heteroatom Chemical group 0.000 claims description 6
- 229920000768 polyamine Polymers 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
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- 125000004433 nitrogen atom Chemical group N* 0.000 claims description 5
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- 238000002360 preparation method Methods 0.000 description 12
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- WDJHALXBUFZDSR-UHFFFAOYSA-M acetoacetate Chemical compound CC(=O)CC([O-])=O WDJHALXBUFZDSR-UHFFFAOYSA-M 0.000 description 5
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- LLPNBWNKPILNSX-UHFFFAOYSA-N 4-methylideneoxetan-2-one propan-2-one Chemical class CC(C)=O.C=C1CC(=O)O1 LLPNBWNKPILNSX-UHFFFAOYSA-N 0.000 description 4
- ZSZHYKUYNPHJGB-UHFFFAOYSA-N C.C#CCN(CCC=COC[Y]C)COCCOC Chemical compound C.C#CCN(CCC=COC[Y]C)COCCOC ZSZHYKUYNPHJGB-UHFFFAOYSA-N 0.000 description 4
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- KHRIPQMMFOGLOF-UHFFFAOYSA-N C.CN(C)C Chemical compound C.CN(C)C KHRIPQMMFOGLOF-UHFFFAOYSA-N 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 2
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- 239000004952 Polyamide Substances 0.000 description 2
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- GCPWJFKTWGFEHH-UHFFFAOYSA-N acetoacetamide Chemical compound CC(=O)CC(N)=O GCPWJFKTWGFEHH-UHFFFAOYSA-N 0.000 description 2
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- 125000002339 acetoacetyl group Chemical group O=C([*])C([H])([H])C(=O)C([H])([H])[H] 0.000 description 2
- 150000001299 aldehydes Chemical class 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
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- 239000012298 atmosphere Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000008139 complexing agent Substances 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 229920006324 polyoxymethylene Polymers 0.000 description 2
- 229920001451 polypropylene glycol Polymers 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 239000011541 reaction mixture Substances 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 125000000467 secondary amino group Chemical group [H]N([*:1])[*:2] 0.000 description 2
- 241000894007 species Species 0.000 description 2
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 description 2
- VILCJCGEZXAXTO-UHFFFAOYSA-N 2,2,2-tetramine Chemical compound NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 description 1
- TXBCBTDQIULDIA-UHFFFAOYSA-N 2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propane-1,3-diol Chemical compound OCC(CO)(CO)COCC(CO)(CO)CO TXBCBTDQIULDIA-UHFFFAOYSA-N 0.000 description 1
- RNLHGQLZWXBQNY-UHFFFAOYSA-N 3-(aminomethyl)-3,5,5-trimethylcyclohexan-1-amine Chemical compound CC1(C)CC(N)CC(C)(CN)C1 RNLHGQLZWXBQNY-UHFFFAOYSA-N 0.000 description 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- NOWKCMXCCJGMRR-UHFFFAOYSA-N Aziridine Chemical compound C1CN1 NOWKCMXCCJGMRR-UHFFFAOYSA-N 0.000 description 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- FERIUCNNQQJTOY-UHFFFAOYSA-M Butyrate Chemical compound CCCC([O-])=O FERIUCNNQQJTOY-UHFFFAOYSA-M 0.000 description 1
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Natural products CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 1
- 229910014033 C-OH Inorganic materials 0.000 description 1
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- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 229910014570 C—OH Inorganic materials 0.000 description 1
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 description 1
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
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- 229920000881 Modified starch Polymers 0.000 description 1
- ZMTCHYALYZRJRQ-UHFFFAOYSA-N N'-(2-methylpropylsilyl)ethane-1,2-diamine Chemical class CC(C)C[SiH2]NCCN ZMTCHYALYZRJRQ-UHFFFAOYSA-N 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 239000004902 Softening Agent Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
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- NSOXQYCFHDMMGV-UHFFFAOYSA-N Tetrakis(2-hydroxypropyl)ethylenediamine Chemical compound CC(O)CN(CC(C)O)CCN(CC(C)O)CC(C)O NSOXQYCFHDMMGV-UHFFFAOYSA-N 0.000 description 1
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 1
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- BWRFQFVRMJWEQW-UHFFFAOYSA-N but-1-ene-1,3-dione Chemical class CC(=O)C=C=O BWRFQFVRMJWEQW-UHFFFAOYSA-N 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
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- 125000004122 cyclic group Chemical group 0.000 description 1
- 150000001991 dicarboxylic acids Chemical class 0.000 description 1
- HPNMFZURTQLUMO-UHFFFAOYSA-N diethylamine Chemical compound CCNCC HPNMFZURTQLUMO-UHFFFAOYSA-N 0.000 description 1
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- 150000002081 enamines Chemical class 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- XYIBRDXRRQCHLP-UHFFFAOYSA-N ethyl acetoacetate Chemical compound CCOC(=O)CC(C)=O XYIBRDXRRQCHLP-UHFFFAOYSA-N 0.000 description 1
- 229940012017 ethylenediamine Drugs 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
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- IPCSVZSSVZVIGE-UHFFFAOYSA-M hexadecanoate Chemical compound CCCCCCCCCCCCCCCC([O-])=O IPCSVZSSVZVIGE-UHFFFAOYSA-M 0.000 description 1
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- 150000002576 ketones Chemical class 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 150000002596 lactones Chemical class 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- WCYWZMWISLQXQU-UHFFFAOYSA-N methyl Chemical compound [CH3] WCYWZMWISLQXQU-UHFFFAOYSA-N 0.000 description 1
- GRVDJDISBSALJP-UHFFFAOYSA-N methyloxidanyl Chemical compound [O]C GRVDJDISBSALJP-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- REODOQPOCJZARG-UHFFFAOYSA-N n-[[diethoxy(methyl)silyl]methyl]cyclohexanamine Chemical compound CCO[Si](C)(OCC)CNC1CCCCC1 REODOQPOCJZARG-UHFFFAOYSA-N 0.000 description 1
- ZQXSMRAEXCEDJD-UHFFFAOYSA-N n-ethenylformamide Chemical compound C=CNC=O ZQXSMRAEXCEDJD-UHFFFAOYSA-N 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 238000005580 one pot reaction Methods 0.000 description 1
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- 125000004437 phosphorous atom Chemical group 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229920006112 polar polymer Polymers 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
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- 125000006239 protecting group Chemical group 0.000 description 1
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- 150000003456 sulfonamides Chemical group 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
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- MBYLVOKEDDQJDY-UHFFFAOYSA-N tris(2-aminoethyl)amine Chemical compound NCCN(CCN)CCN MBYLVOKEDDQJDY-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- 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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/18—Reinforcing agents
- D21H21/20—Wet strength agents
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/02—Polyamines
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/42—Block-or graft-polymers containing polysiloxane sequences
- C08G77/46—Block-or graft-polymers containing polysiloxane sequences containing polyether sequences
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/12—Chemical modification
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
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- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/53—Polyethers; Polyesters
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- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
- D21H17/55—Polyamides; Polyaminoamides; Polyester-amides
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
- D21H17/56—Polyamines; Polyimines; Polyester-imides
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/59—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon
-
- 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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/002—Tissue paper; Absorbent paper
Definitions
- the invention relates to a method for treating cellulose-containing fibers or planar structures containing cellulose-containing fibers.
- US 2004/0118540 A1 describes a papermaking process in which first a high molecular weight amine component having an NH 2 concentration of at least 1.5 meq/g is introduced into the aqueous cellulose fiber mixture. Separately therefrom, a second component which can react with amino groups and which is either a polyanionic compound or an aldehyde-functional polymer is then added.
- a paper product having increased strength is claimed in U.S. Pat. No. 6,824,650 B2.
- the product contains a combination of a polyvinylamine and a complexing agent selected from an aldehyde-functional polymer and a polyelectrolyte.
- the paper product is strengthened by reaction of polyvinylamine with the complexing agent.
- the invention relates to a method for treating cellulose-containing fibers or planar structures containing cellulose-containing fibers with a combination of
- the compounds (1) used in the method according to the invention may have a monomeric, oligomeric or polymeric character.
- the compounds (1) preferably contain at least five primary amino groups (—NH 2 ), preferably at least 20 primary amino groups (—NH 2 ) and particularly preferably at least 100 primary amino groups (—NH 2 ).
- Polyamines are preferably used as compounds (1).
- compounds (1) are polymers of ethyleneimine in linear or branched form and polyvinylamine. The latter obtained by polymerization of N-vinylformamide and subsequent partial or complete hydrolysis are generally commercially available in the form of aqueous dilutions.
- the compounds (2) used in the method according to the invention may have a monomeric, oligomeric or polymeric character, preferably a polymeric character.
- the compounds (2) preferably contain at least two ⁇ -keto-carbonyl groups and preferably at least three ⁇ -keto-carbonyl groups.
- the ⁇ -ketocarbonyl groups in compound (2) preferably have the structure of the formula
- ⁇ -Ketocarbonyl-functional monomeric compounds (2a) can be prepared by known methods, preferably by reacting compounds of the general formula
- L, Y and e have the meaning stated above therefor, with diketenes, diketene-acetone adducts and thermally labile acetoacetates.
- the radical L is preferably a hydrocarbon radical which has 1 to 18 carbon atoms and may contain one or more oxygen or nitrogen atoms separate from one another.
- Compounds (2) in polymeric form are selected from the group consisting of the
- Compounds (2) may correspond either to only one of these species or may correspond to a combination of two or more species from this group. These in turn may be present in separate compounds and/or may be combined in one polymer type, as is the case with silicone polyethers.
- radical K are therefore polymer radicals selected from the groups consisting of the
- organopolysiloxanes polyesters, polyethers, polyacetals, polyetheracetals, polyesterpolyols, polyamides and mixtures and copolymers thereof.
- ⁇ -Ketocarbonyl-functional polymeric compounds (2b) can be prepared by known methods—analogously to the preparation of the ⁇ -ketocarbonyl-functional monomeric compounds (2a)—preferably by reacting compounds of the general formula
- K, Y and f have the meanings stated above therefor, with diketenes, diketene-acetone adducts and thermally labile acetoacetates.
- Partial or complete hydrolysis products of polyvinyl acetate Partial or complete hydrolysis products of polyvinyl-formamide Silicone polyethers obtained from ⁇ , ⁇ -dihydroorgano-polysiloxanes and allylpolyethers Silicone polyethers obtained from siloxanes having MeHSiO units and allylpolyethers Polyaminoamides obtained from dicarboxylic acids and diethylenetriamine Polyaminoamides obtained from methyl dicarboxylates and triethylenetetramine Aminosilicones containing H 2 NC 3 H 6 (Me)SiO groups Aminosilicones containing H 2 NC 2 H 4 NHC 3 H 6 (Me)SiO groups Condensates of polydimethylsiloxanediols and secondary ⁇ -aminosilanes, such as cyclohexylaminomethylmethyl-diethoxysilane, Me being a methyl radical.
- ⁇ -Ketocarbonyl-functional polymeric compounds (2b) are preferably, entirely or at least in proportions, organopolysiloxanes or copolymers containing organo-polysiloxanes, such as silicone polyethers.
- the organo-polysiloxanes or their copolymers preferably have a linear or branched structure.
- These polymeric compounds (2b) are prepared by reacting organopolysiloxanes or their copolymers which contain at least two carbinol functions ( ⁇ C—OH) and/or primary or secondary SiC-bonded amino groups with the same substances, such as compounds of the general formula (II), i.e. with diketenes, diketene-acetone adducts and thermally labile acetoacetates.
- organosiloxane polymers used in the method according to the invention are soluble or at least dispersible in water. Organosiloxane polymers having components of relatively high polarity are necessary for this purpose.
- ⁇ -keto-carbonyl-functional organosilicon compounds (2c) which contain at least one Si-bonded radical of the general formula
- ⁇ -ketocarbonyl-functional organosilicon compounds (2c) are prepared by a procedure in which,
- aminosilicon compounds (i) which contain at least one Si—C-bonded amino group A of the general formula
- R 1 , R 2 , R 3 , R 4 , Y, Z, a and x have the meanings stated above therefor
- E 2 is a monofunctional terminal group or a radical of the general formula —Y—C(O)—CR 4 ⁇ C(CH 2 R 4 )—OH or —Y—C(O)—CHR 4 — C(O)—CH 2 R 4
- the organosilicon compounds (2c′) obtained in the first stage are reacted with diketenes (iii) of the general formula
- the aminosilicon compounds (i) are reacted in a first stage with acetoacetyl compounds (ii) of the tautomeric forms (VIIa) or (VIIb) and are reacted in a subsequent second stage with diketenes (iii).
- This reaction sequence can be advantageously carried out in a one-pot process.
- a particularly preferred procedure is the upstream preparation of compound (ii) from the parent compounds (iv) by reacting these with diketenes (iii), after which aminosilicon compounds (i) are metered in at the end of the reaction and the organosilicon compounds (2c) according to the invention are then obtained in a particularly economical method by further metering in of diketenes (iii) after the reaction thereof.
- Z preferably has a weight-based heteroatom content of at least 20% and particularly preferably at least 25%.
- Preferred aminosilicon compounds (i) are organopoly-siloxanes having at least one Si—C-bonded radical A of the formula (VI).
- Preferred aminosilicon compounds (i) are organopoly-siloxanes of the general formula
- R is a monovalent hydrocarbon radical having 1 to 18 C atoms
- R′ is a hydrogen atom or a monovalent hydrocarbon radical having 1 to 18 C atoms, preferably a hydrogen atom
- g is 0 or 1
- k is 0 or an integer from 1 to 30
- l is 0 or an integer from 1 to 1000, with the proviso that at least one radical A is present per molecule.
- Aminosilicon compounds (i) preferably contain amino group concentrations in the range of 0.01 to about 10 meq/g, in particular from about 0.05 to 5 meq/g.
- Preferred viscosities are in the range from about 100 to 50 000 mPa ⁇ s at 25° C., the range 500 to 10 000 mPa ⁇ s at 25° C. being particularly preferred.
- aminosilicon compounds (i) are preferably used without prior conversion of the amino groups by means of protective group reagents, such as aldehydes or ketones.
- the aminosilicon compounds (i) are preferably prepared from “diamino” monomers, such as aminoethylamino-propyl- or aminoethylaminoisobutylsilanes, the Si—C— bonded amino group A containing both a primary and a secondary amino radical, bonded to the same Si atom.
- diamino monomers
- the radicals A preferably the primary amino radicals react with the compounds (ii), the secondary amino radicals being retained as basic centers.
- the compounds (ii) can be used as reactants for the aminosilicon compound (i) in two tautomeric forms of the formulae (VIIa) and (VIIb).
- the compounds (ii) are preferably obtained by reacting the parent compounds (iv) of the formula (E 2 ) x Z-Y (X), which are saturated with hydrogen at the free valencies,
- E 2 , Z, Y and x have the meanings stated above therefor, with diketenes, acetylketenes, alkyl-diketenes, diketene-acetone adducts or acetoacetates, preferably with diketenes or their acetone adducts, by methods known in the literature.
- the radical “Z” is defined as an organic radical which, owing to its bifunctionality to hexafunctionality, is linked to 2 to 6 further groups E or Y: the sum of “E” plus “Y” corresponds in its numerical value to this bifunctionality to hexafunctionality.
- “Z” is bifunctional, i.e. divalent. In this case, “Z” is bonded either to two Y groups or to one Y group and one monofunctional terminal group.
- Monofunctional terminal groups may be saturated or unsaturated hydrocarbon radicals having 1 to 18 C atoms or acyl radicals, such as the acetate, butyrate, palmitate or stearate radical, as well as the acrylate, methacrylate or benzoate radical.
- the radical “Z” has a heteroatom content of at least 10% by weight. Heteroatoms are selected from the group consisting of the O, N, B, P and S atoms; preferably O and N atoms, particularly preferably O atoms.
- the radical “Z” has the function of introducing higher polarity and hence a higher degree of hydrophilicity into the organosilicon compounds (1) according to the invention, and it is for this reason that a relatively high content of heteroatoms is preferred.
- the radical “Z” is particularly preferably a polyether or polyester.
- Trifunctional to hexafunctional radicals “Z” are usually started from alcohols of the same functionality as well as from amines.
- trimethylolpropane or ammonia gives, with ethylene oxide, parent compounds (iv) with “Z” of the general formula C 2 H 5 C[CH 2 (OC 2 H 4 ) m/3 ] 3 or N [C 2 H 4 (OC 2 H 4 ) (m-1)/3 ] 3 , in which m is the total number of moles of ethylene oxide, preferably 5 to 100, the free valencies of which are linked to oxygen atoms (Y) which in turn are saturated with hydrogen.
- the correspondingly more highly functionalized carbinol or amino compounds are usually used: tetrafunctionality from pentaerythritol or ethylenediamine, hexa-functionality from sorbitol or tris(aminoethyl)amine.
- Corresponding polyesters can be prepared from identical or similar starter compounds by ring-opening polymerization of cyclic esters (lactones) by generally known methods.
- Preferred parent compounds (iv) are polyethylene glycol, polypropylene glycol and the copolymers thereof, and the monoalkyl ethers thereof. The latter are a special case where “Y” is oxygen and “E” is an alkyl group (methyl, alkyl, butyl).
- these parent compounds (iv) are monofunctional.
- the compounds (ii) prepared therefrom are likewise monofunctional and accordingly serve for saturating amino groups with polar polymers.
- bifunctional reactants (ii) which have a chain-extending effect with respect to likewise bifunctional aminosilicon compounds (i), i.e. which contain two amino groups A per molecule, are obtained from polyalkylene glycols.
- branched products (2c) it is also possible to obtain branched products (2c) provided that the aminosilicon compounds (i) contain at least three amino groups A per molecule.
- An alternating siloxane-polyether structure forms.
- the surprisingly high selectivity of the compounds (ii) having primary amino radicals in the amino groups A of the aminosilicon compounds (i) permits virtually complete conversion of the H 2 N radicals into enamines, and it is for this reason that a stoichiometric ratio of primary NH 2 radicals in amino groups A of compounds (i) to acetoacetyl groups in compounds (ii) close to 1.0 is preferably used in the first stage of the method for the preparation of (2c). This ratio is particularly preferably 0.8 to 1.0. However, it may also be above 1.0. In this case, not all primary amino radicals are converted, which are then however additionally available for reaction with diketenes (iii). This procedure is technically possible but is not preferred.
- the acetone adducts of diketenes (iii) can also be used as said diketenes.
- diketenes (iii) are preferably used.
- the stoichiometric ratio of secondary —NH groups in amino groups A of compounds (i) to diketenes (iii) is 5:1 to 0.5:1, preferably 2:1 to 0.8:1, in the subsequent reaction with diketenes (iii).
- a ratio of about 1:1 is particularly preferred.
- the method for the preparation (2c) can be effected in the presence of organic solvents or the products (2c) according to the invention can be diluted with organic solvents.
- the method for the preparation of (2c) is preferably carried out at temperatures of 10 to 100° C., preferably 40 to 80° C. Furthermore, the method is preferably carried out at the pressure of the ambient atmosphere but can also be carried out at higher and lower pressures.
- the treatment of the cellulose-containing fibers or planar structures containing cellulose-containing fibers can be effected in two different variants of the method.
- the treatment of the cellulose-containing fibers or planar structures containing cellulose-containing fibers is effected preferably first with (1) compounds having at least two primary amino groups and subsequently with (2) compounds having at least one ⁇ -ketocarbonyl group.
- the application of the compound (2) is effected only after the action of the compound (1) on the cellulose-containing fibers or planar structures containing cellulose-containing fibers.
- the treatment of the cellulose-containing fibers or planar structures containing cellulose-containing fibers is preferably effected with a mixture of (1) compounds having at least two primary amino groups and (2) compounds having at least one ⁇ -ketocarbonyl group, the mixture of (1) and (2) being prepared before the treatment.
- a premix of (1) and (2) is first prepared and the premix is then applied to the cellulose-containing fibers or planar structures containing cellulose-containing fibers.
- compounds (1) and (2) are used in amounts such that the compounds (1) are used in amounts of preferably 0.1 to 1000 mol, preferably 0.5 to 500 mol, particularly preferably 1.1 to 500 mol of amino group, based in each case on 1 mol of ⁇ -ketocarbonyl group in compounds (2).
- cellulose-containing fibers which are treated according to the invention are all cellulose-containing fibers and all aqueous cellulose-containing slurries from which paper products can be produced, such as bleached fibers, recycled fibers, fibers which are produced via chemical digestion methods, such as the sulfate or sulfite method, fibers which are produced from vegetable raw materials (fibrous plants) and which have a sufficient cellulose content, and mechanical pulps which are produced predominantly by mechanical defibration of wood.
- the cellulose fiber-containing materials are materials such as wood, grass fibers, straw, bamboo, corn fibers and hemp, in each case in any desired forms, such as scraps, chips or sawdust.
- planar structures containing cellulose-containing fibers are all paper products produced from cellulose-containing fibers, such as paper towels, toilet paper, tissues, kitchen paper, paper napkins, facial tissues.
- the paper to be treated according to the invention may be low-quality paper varieties, such as absorptive papers, including base paper, i.e. kraft paper not pretreated with chemicals and/or polymeric natural substances having a weight of 60 to 150 g/m 2 , unsized papers, paper having a low freeness, wood-containing papers, unglazed or uncalendered papers, papers which are smooth on one side owing to the use of a calendar stack in their production without further expensive measures and are therefore referred to as “papers machine-finished on one side”, uncoated papers and papers produced from paper waste, i.e. so-called waste papers.
- absorptive papers including base paper, i.e. kraft paper not pretreated with chemicals and/or polymeric natural substances having a weight of 60 to 150 g/m 2 , unsized papers, paper having a low freeness, wood-containing papers, unglazed or uncalendered papers, papers which are smooth on one side owing to the use of a calendar stack in their production without further expensive measures and are therefore
- the paper to be treated according to the invention can of course also be high-quality paper varieties, such as low-absorption papers, sized papers, papers having a high freeness, wood-free papers, calendered or glazed papers, glassine papers, parchmentized papers or precoated papers.
- the boards may also be of high or low quality.
- the compounds (1) and (2) are used in the form of aqueous solutions or aqueous dispersions in the treatment of the cellulose-containing fibers or planar structures containing cellulose-containing fibers.
- compound (1) is preferably present in amounts of 0.1 to 20% by weight, preferably 0.2 to 10% by weight.
- compound (2) is preferably present in amounts of 0.1 to 50% by weight, preferably 0.5 to 20% by weight.
- cellulose-containing fibers or planar structures containing cellulose-containing fibers can be effected by the methods known in the prior art, in particular by the methods known in the production and finishing of paper products, as described, for example, in U.S. Pat. No. 6,824,650 B2, column 12, line 1 to column 13, line 15.
- the treatment can be effected by metering the compounds (1) and (2)—either individually in successive steps or together as a premix of (1) and (2)—into the aqueous cellulose-containing fiber slurry from which the planar structures containing cellulose-containing fibers, such as paper products, are produced or during the concentration or drying process.
- the treatment can also be effected by spraying the compounds (1) and (2)—either individually in successive spraying steps or together as a premix of (1) and (2)—onto the planar structures containing cellulose-containing fibers, such as paper products.
- the planar structures may be moist or dry during the process.
- the treatment can also be effected by coating the surface of the planar structures, such as paper products, with the compounds (1) and (2)—either individually in successive steps or together as a premix of (1) and (2).
- the treatment can also be effected by impregnating the wet or dry planar structures with the compounds (1) and (2)—either individually in successive steps or together as a premix of (1) and (2)—the planar structures being completely or partly penetrated therewith.
- the invention furthermore relates to paper products containing
- planar structures containing cellulose-containing fibers, the planar structures furthermore containing a combination of
- the compound (1) and (2) are preferably added to cellulose-containing fiber slurries which are used for the production of the planar structures.
- the compounds (1) and (2) are preferably used in each case in amounts of 0.1 to 50% by weight, preferably 0.2 to 20% by weight, based on the total weight of the dry cellulose-containing fibers or dry planar structures containing cellulose-containing fibers.
- further substances which are usually concomitantly used in the treatment of cellulose-containing fibers or planar structures containing cellulose-containing fibers can also be concomitantly used.
- further substances are antifoams, dry strength agents, such as (modified) starch, carboxymethylcellulose or (modified) polyacrylamides, softening agents, drainage aids or retention aids.
- the treatment according to the invention is preferably carried out at temperatures of 5 to 60° C., preferably 15 to 35° C.
- the treatment according to the invention is preferably carried out at the pressure of the ambient atmosphere, i.e. at 1020 hPa, but can also be carried out at higher or lower pressures.
- the high-viscosity product has a solids content of 75% and an acetoacetamide content of 0.22 meq/g.
- 13.3 g of the 75% strength solution obtained in example 2 are homogeneously mixed with 10.0 g of the diacetoacetate of PEG 1000 and diluted with isopropanol to 200 g.
- the clear solution contains 0.105 meq/g of ⁇ -ketocarbonyl groups per g.
- 0.1 g of triethylamine and thereafter 20.6 g of diketene are slowly metered into 200 g of a silicone polyether prepared from 2 parts of allylpolyether of the formula CH 2 ⁇ CH—CH 2 O(C 2 H 4 O) 10 H and 1 part of hydrogen-siloxane of the formula HO(HSiMeO) 14.3 (SiMe 2 O) 60 H.
- a silicone polyether prepared from 2 parts of allylpolyether of the formula CH 2 ⁇ CH—CH 2 O(C 2 H 4 O) 10 H and 1 part of hydrogen-siloxane of the formula HO(HSiMeO) 14.3 (SiMe 2 O) 60 H.
- the batch is kept at 70° C. for a further hour.
- a pale brownish product which has a viscosity of about 20 000 mm 2 /s in undiluted form is obtained.
- the concentration of acetoacetate is 1.10 meq/g.
- 50 g of the polymeric acetoacetate obtained in example 5 are further condensed at 100° C. after dropwise addition of 0.2 g of a 10% strength solution of p-toluenesulfonic acid in THF, with the result that a gel-like high polymer which is soluble in the same amount of isopropanol to give a clear solution is obtained.
- the 50% strength solution contains aceto-acetate groups at a level of 0.55 meq/g.
- a 10% strength solution is prepared.
- a 10% strength aqueous solution of the diacetoacetate of PEG 2000 are added to 200 g of this dilution and homogeneously mixed. After 3 days, a clear aqueous solution which no longer contains detectable acetoacetate is obtained.
- the mixture is a ready-to-use one-component formulation of the compounds (1) and (2).
- the molar ratio of amino to acetoacetate groups is about 700:1.
- the polyamine (1) is in principle applied first as a 1% strength aqueous solution by the spray process described below and is dried at 105° C. for 5 minutes.
- the active substance application of compound (1) is stated in the table and is 0.5 or 0.9% by weight, based on the dry weight of the paper towel.
- the substrate, the paper towel, is preconditioned therewith.
- the active substance application of compound (2) is stated in % by weight, based on the dry weight of the paper towel. This product application is determined by weighing the uncoated and the wet paper towel. The product application is effected on one side. Thereafter, the coated paper towel is dried at 105° C. for 5 min.
- the paper towel to be tested is cut into at least 10 strips having a minimum length of 152 mm and a width of 25 mm in the running direction.
- test specimens are clamped in the ZWICK 1446 tensile tester, likewise in the running direction, and the following parameters are set:
- the paper towel is moistened in the middle by brief immersion in demineralized water to at least 25 mm to not more than 50 mm. The ends remain dry for clamping. (Cf. also point 8.2 in DIN ISO 3781.) The evaluation and settings are the same as for the dry breaking strength method.
- the improvement in the wet strength of the test strips by the additional compound (2) is clear from the higher TEA values, with improved soft handle throughout in the comparison with the test strips treated only with (1). In most cases, even an improvement in the soft handle compared with the blank sample is achieved.
Abstract
Cellulosic substrates are treated with compound(s) containing at least two primary amino groups and compounds containing at least one β-ketocarbonyl group. The substrates exhibit good strength and hand properties.
Description
- The invention relates to a method for treating cellulose-containing fibers or planar structures containing cellulose-containing fibers.
- US 2004/0118540 A1 describes a papermaking process in which first a high molecular weight amine component having an NH2 concentration of at least 1.5 meq/g is introduced into the aqueous cellulose fiber mixture. Separately therefrom, a second component which can react with amino groups and which is either a polyanionic compound or an aldehyde-functional polymer is then added.
- A paper product having increased strength is claimed in U.S. Pat. No. 6,824,650 B2. The product contains a combination of a polyvinylamine and a complexing agent selected from an aldehyde-functional polymer and a polyelectrolyte. The paper product is strengthened by reaction of polyvinylamine with the complexing agent.
- Articles which contain cellulose of which at least part was chemically modified and where a further chemical has formed chemical bonds are claimed in U.S. Pat. No. 6,916,402 B2. The chemical modification of the cellulose can be carried out with compounds which contain aldehyde, epoxy or anhydride groups, while the further chemical then contains amino, thiol, amido, sulfonamide or sulfinic acid groups—or vice versa.
- It was the object to provide a method by means of which the wet strength of cellulose-containing products, in particular the wet strength of paper towels, is to be increased, it being intended that the products also have a soft handle. The object is achieved by the invention.
- The invention relates to a method for treating cellulose-containing fibers or planar structures containing cellulose-containing fibers with a combination of
- (1) compounds having at least two primary amino groups and
(2) compounds having at least one β-ketocarbonyl group. - The compounds (1) used in the method according to the invention may have a monomeric, oligomeric or polymeric character. The compounds (1) preferably contain at least five primary amino groups (—NH2), preferably at least 20 primary amino groups (—NH2) and particularly preferably at least 100 primary amino groups (—NH2). The density of amino groups in compounds (1) is preferably at least 1.0 meq/g, preferably at least 3.0 meq/g (meq/g=milliequivalent per g of substance=equivalent per kg of substance).
- Polyamines are preferably used as compounds (1). Examples of compounds (1) are polymers of ethyleneimine in linear or branched form and polyvinylamine. The latter obtained by polymerization of N-vinylformamide and subsequent partial or complete hydrolysis are generally commercially available in the form of aqueous dilutions.
- The compounds (2) used in the method according to the invention may have a monomeric, oligomeric or polymeric character, preferably a polymeric character. The compounds (2) preferably contain at least two β-keto-carbonyl groups and preferably at least three β-keto-carbonyl groups.
- The β-ketocarbonyl groups in compound (2) preferably have the structure of the formula
-
—Y′—C(O)—CHR4—C(O)—CH2R4 - or its tautomeric enol form of the formula
-
—Y′—C(O)—CR4═C(CH2R4)—OH - in which
- Y′ is —O—, —NR2— or
- preferably —O—,
- R2 is a hydrogen atom or a monovalent hydrocarbon radical having 1 to 30 C atoms, preferably a hydrogen atom, and
- R4 is a hydrogen atom or a monovalent hydrocarbon radical having 1 to 18 C atoms, preferably a hydrogen atom.
- In the method according to the invention, β-keto-carbonyl-functional monomeric compounds (2a) of the general formula
-
L(—Y—C(O)—CHR4—C(O)—CH2R4)e (I) - or their tautomeric enol forms
in which - e is an integer from 1 to 20, preferably 2 to 20, preferably 2 to 8,
- L is a monomeric organic radical having the valency or functionality corresponding to the index e in formula (I), i.e. a monofunctional to 20-functional monomeric organic radical, preferably a monofunctional to 8-functional monomeric radical,
- Y is —O— or —NR2—, preferably —O—,
- R2 is a hydrogen atom or a monovalent hydrocarbon radical having 1 to 30 C atoms, preferably a hydrogen atom, and
- R4 is a hydrogen atom or a monovalent hydrocarbon radical having 1 to 18 C atoms, preferably a hydrogen atom,
can be used as compounds (2). - β-Ketocarbonyl-functional monomeric compounds (2a) can be prepared by known methods, preferably by reacting compounds of the general formula
-
L(—YH)e (II) - in which L, Y and e have the meaning stated above therefor, with diketenes, diketene-acetone adducts and thermally labile acetoacetates.
- The radical L is preferably a hydrocarbon radical which has 1 to 18 carbon atoms and may contain one or more oxygen or nitrogen atoms separate from one another.
- Examples of the compounds L(—YH)e of the formula (II) on which the β-ketocarbonyl-functional monomeric compounds (2a) are based are
- Compounds (2) in polymeric form are selected from the group consisting of the
-
- organosiloxane polymers
- polyesters
- polyethers
- polyacetals
- polyetheracetals
- polyesterpolyols
- polyamides
- Compounds (2) may correspond either to only one of these species or may correspond to a combination of two or more species from this group. These in turn may be present in separate compounds and/or may be combined in one polymer type, as is the case with silicone polyethers.
- In the method according to the invention, β-keto-carbonyl-functional oligomeric or polymeric compounds (2b) of the general formula
-
K(—Y—C(O)—CHR4—C(O)—CH2R4)f (III) - or their tautomeric enol forms
in which - f is an integer from 1 to 10 000, preferably 2 to 2000, preferably 2 to 200,
- K is an oligomeric or polymeric, organic or organo-silicon radical having the valency or functionality corresponding to the index f in formula (III), i.e. a monofunctional to 10 000-functional oligomeric or polymeric, organic or organosilicon radical, and
- Y and R4 have the meaning stated above therefor, can therefore be used as compounds (2).
- Examples of the radical K are therefore polymer radicals selected from the groups consisting of the
- organopolysiloxanes,
polyesters,
polyethers,
polyacetals,
polyetheracetals,
polyesterpolyols,
polyamides and
mixtures and copolymers thereof. - β-Ketocarbonyl-functional polymeric compounds (2b) can be prepared by known methods—analogously to the preparation of the β-ketocarbonyl-functional monomeric compounds (2a)—preferably by reacting compounds of the general formula
-
K(—YH)f (IV) - in which K, Y and f have the meanings stated above therefor, with diketenes, diketene-acetone adducts and thermally labile acetoacetates.
- Examples of compounds K(—YH)f of the formula (IV) on which the β-ketocarbonyl-functional polymeric compounds (2b) are based are
- MeO(C2H4O)pH where p=2-20 000
- HO(C3H6O)qH where q=2-200
- HO-functional polyesters obtained from dicarboxylic acid and diols
HO-functional polyesters obtained from dicarboxylic esters and diols
HO-functional polyesters obtained from diols and caprolactone - Partial or complete hydrolysis products of polyvinyl acetate
Partial or complete hydrolysis products of polyvinyl-formamide
Silicone polyethers obtained from α,ω-dihydroorgano-polysiloxanes and allylpolyethers
Silicone polyethers obtained from siloxanes having MeHSiO units and allylpolyethers
Polyaminoamides obtained from dicarboxylic acids and diethylenetriamine
Polyaminoamides obtained from methyl dicarboxylates and triethylenetetramine
Aminosilicones containing H2NC3H6(Me)SiO groups
Aminosilicones containing H2NC2H4NHC3H6(Me)SiO groups
Condensates of polydimethylsiloxanediols and secondary α-aminosilanes, such as cyclohexylaminomethylmethyl-diethoxysilane,
Me being a methyl radical. - β-Ketocarbonyl-functional polymeric compounds (2b) are preferably, entirely or at least in proportions, organopolysiloxanes or copolymers containing organo-polysiloxanes, such as silicone polyethers. The organo-polysiloxanes or their copolymers preferably have a linear or branched structure. These polymeric compounds (2b) are prepared by reacting organopolysiloxanes or their copolymers which contain at least two carbinol functions (≡C—OH) and/or primary or secondary SiC-bonded amino groups with the same substances, such as compounds of the general formula (II), i.e. with diketenes, diketene-acetone adducts and thermally labile acetoacetates.
- Since the increase in the wet strength of cellulose-containing products is preferably effected in the wet-end region as a result of production, it is advantageous if the organosiloxane polymers used in the method according to the invention are soluble or at least dispersible in water. Organosiloxane polymers having components of relatively high polarity are necessary for this purpose.
- In the method according to the invention, β-keto-carbonyl-functional organosilicon compounds (2c) which contain at least one Si-bonded radical of the general formula
- or its tautomeric enol forms,
where - —(Si≡) is the bond to the silicon atom,
- R1 is a divalent organic radical having 1 to 6 carbon atoms which may optionally contain nitrogen atoms separate from one another, preferably a divalent hydrocarbon radical having 1 to 6 C atoms which may optionally contain one or more nitrogen atoms separate from one another,
- R3 is a divalent organic radical having 1 to 6 carbon atoms, preferably having 2 to 6 carbon atoms, preferably a divalent hydrocarbon radical having 2 to 6 carbon atoms,
- Y, R2 and R4 have the meanings stated above therefor,
- Z is a divalent to hexavalent organic radical having a monomeric, oligomeric or polymeric structure, which has a weight-based heteroatom content of at least 10%, which is bonded via C atoms,
- E1 is a monofunctional terminal group or an Si—C— bonded radical of the general formula
- a is an integer from 1 to 5, preferably 1 or 2, and
- x is 0 or an integer from 1 to 5, preferably 0 or 1, preferably 1,
can as compounds (2) for this purpose. - The β-ketocarbonyl-functional organosilicon compounds (2c) are prepared by a procedure in which,
- in a first stage,
aminosilicon compounds (i) which contain at least one Si—C-bonded amino group A of the general formula -
HNR2—(R3—NH—)aR1—(Si≡) (VI) - are reacted with compounds (ii) which contain at least one β-ketocarbonyl-functional radical of the general formula
-
(E2)xZ-Y—C(O)—CR4═C(CH2R4)—OH (VIIa) or -
(E2)xZ-Y—C(O)—CHR4—C(O)—CH2R4 (VIIb) - in which
organosilicon compounds (2c′) of the general formula -
(E2)xZ-Y—C(O)—CR4═C(CH2R4)—NR2—(R3—NH—)aR1—(Si≡) (V′) - are obtained, in which
R1, R2, R3, R4, Y, Z, a and x have the meanings stated above therefor, and
E2 is a monofunctional terminal group or a radical of the general formula —Y—C(O)—CR4═C(CH2R4)—OH or —Y—C(O)—CHR4— C(O)—CH2R4,
and, in a second stage,
the organosilicon compounds (2c′) obtained in the first stage are reacted
with diketenes (iii) of the general formula - in which
R4 has the meaning stated above therefor. - In the method according to the invention, the aminosilicon compounds (i) are reacted in a first stage with acetoacetyl compounds (ii) of the tautomeric forms (VIIa) or (VIIb) and are reacted in a subsequent second stage with diketenes (iii). This reaction sequence can be advantageously carried out in a one-pot process. A particularly preferred procedure is the upstream preparation of compound (ii) from the parent compounds (iv) by reacting these with diketenes (iii), after which aminosilicon compounds (i) are metered in at the end of the reaction and the organosilicon compounds (2c) according to the invention are then obtained in a particularly economical method by further metering in of diketenes (iii) after the reaction thereof.
- Preferred examples of Si—C-bonded amino groups A of the formula (VI) are
-
- H2N—C2H4—NH—CH2—
- H2N—C3H6—NH—CH2—
- H2N—C3H6—NH—C3H6—NH—CH2—
- H2N—C2H4—NH—C3H6—
- H2N—C3H6—NH—C3H6—
- H2N—C2H4—NH—C2H4—NH—C3H6—
- H2N—C3H6—NH—C3H6—NH—C3H6—
- H2N—C2H4—NH—C4H8—
R2 is preferably a hydrogen atom.
R3 is particularly preferably an alkylene radical having 2 to 6 carbon atoms.
R4 is preferably a hydrogen atom.
- Z preferably has a weight-based heteroatom content of at least 20% and particularly preferably at least 25%.
- Preferred aminosilicon compounds (i) are organopoly-siloxanes having at least one Si—C-bonded radical A of the formula (VI).
- Preferred aminosilicon compounds (i) are organopoly-siloxanes of the general formula
-
AgR3-gSiO(SiR2O)l(SiRAO)kSiR3-gAg (IXa), -
(R′O )R2SiO(SiR2O)l(SiRAO)kSiR2(OR′) (IXb) - in which A has the meaning stated above therefor,
R is a monovalent hydrocarbon radical having 1 to 18 C atoms,
R′ is a hydrogen atom or a monovalent hydrocarbon radical having 1 to 18 C atoms, preferably a hydrogen atom,
g is 0 or 1,
k is 0 or an integer from 1 to 30 and
l is 0 or an integer from 1 to 1000,
with the proviso that at least one radical A is present per molecule. - Aminosilicon compounds (i) preferably contain amino group concentrations in the range of 0.01 to about 10 meq/g, in particular from about 0.05 to 5 meq/g. Preferred viscosities are in the range from about 100 to 50 000 mPa·s at 25° C., the range 500 to 10 000 mPa·s at 25° C. being particularly preferred.
- The aminosilicon compounds (i) are preferably used without prior conversion of the amino groups by means of protective group reagents, such as aldehydes or ketones.
- The aminosilicon compounds (i) are preferably prepared from “diamino” monomers, such as aminoethylamino-propyl- or aminoethylaminoisobutylsilanes, the Si—C— bonded amino group A containing both a primary and a secondary amino radical, bonded to the same Si atom. In the radicals A, preferably the primary amino radicals react with the compounds (ii), the secondary amino radicals being retained as basic centers.
- The compounds (ii) can be used as reactants for the aminosilicon compound (i) in two tautomeric forms of the formulae (VIIa) and (VIIb).
- The compounds (ii) are preferably obtained by reacting the parent compounds (iv) of the formula (E2)xZ-Y (X), which are saturated with hydrogen at the free valencies,
- in which E2, Z, Y and x have the meanings stated above therefor, with diketenes, acetylketenes, alkyl-diketenes, diketene-acetone adducts or acetoacetates, preferably with diketenes or their acetone adducts, by methods known in the literature.
- The radical “Z” is defined as an organic radical which, owing to its bifunctionality to hexafunctionality, is linked to 2 to 6 further groups E or Y: the sum of “E” plus “Y” corresponds in its numerical value to this bifunctionality to hexafunctionality. In the simplest case, which is also preferred, “Z” is bifunctional, i.e. divalent. In this case, “Z” is bonded either to two Y groups or to one Y group and one monofunctional terminal group. Monofunctional terminal groups may be saturated or unsaturated hydrocarbon radicals having 1 to 18 C atoms or acyl radicals, such as the acetate, butyrate, palmitate or stearate radical, as well as the acrylate, methacrylate or benzoate radical.
- The radical “Z” has a heteroatom content of at least 10% by weight. Heteroatoms are selected from the group consisting of the O, N, B, P and S atoms; preferably O and N atoms, particularly preferably O atoms. The radical “Z” has the function of introducing higher polarity and hence a higher degree of hydrophilicity into the organosilicon compounds (1) according to the invention, and it is for this reason that a relatively high content of heteroatoms is preferred. The radical “Z” is particularly preferably a polyether or polyester. Examples of polyethers are polyethylene oxide, polypropylene oxide or polybutylene oxide (also poly-THF) and also copolymers of the general formula (CaH2aO)nCaH2a where a=2, 3 or 4 and n is an integer from 1 to 500, preferably from 1 to 100 and particularly preferably from 5 to 60.
- Trifunctional to hexafunctional radicals “Z” are usually started from alcohols of the same functionality as well as from amines. Thus, trimethylolpropane or ammonia gives, with ethylene oxide, parent compounds (iv) with “Z” of the general formula C2H5C[CH2(OC2H4)m/3]3 or N [C2H4 (OC2H4)(m-1)/3]3, in which m is the total number of moles of ethylene oxide, preferably 5 to 100, the free valencies of which are linked to oxygen atoms (Y) which in turn are saturated with hydrogen. For the preparation of parent compounds (iv) having a higher functionality, the correspondingly more highly functionalized carbinol or amino compounds are usually used: tetrafunctionality from pentaerythritol or ethylenediamine, hexa-functionality from sorbitol or tris(aminoethyl)amine.
- Corresponding polyesters can be prepared from identical or similar starter compounds by ring-opening polymerization of cyclic esters (lactones) by generally known methods. Preferred parent compounds (iv) are polyethylene glycol, polypropylene glycol and the copolymers thereof, and the monoalkyl ethers thereof. The latter are a special case where “Y” is oxygen and “E” is an alkyl group (methyl, alkyl, butyl). With regard to the conversion into compounds (ii), these parent compounds (iv) are monofunctional. Compared with the aminosilicon compounds (i), the compounds (ii) prepared therefrom are likewise monofunctional and accordingly serve for saturating amino groups with polar polymers.
- In contrast, bifunctional reactants (ii) which have a chain-extending effect with respect to likewise bifunctional aminosilicon compounds (i), i.e. which contain two amino groups A per molecule, are obtained from polyalkylene glycols. In this way, it is also possible to obtain branched products (2c) provided that the aminosilicon compounds (i) contain at least three amino groups A per molecule. An alternating siloxane-polyether structure forms.
- The surprisingly high selectivity of the compounds (ii) having primary amino radicals in the amino groups A of the aminosilicon compounds (i) permits virtually complete conversion of the H2N radicals into enamines, and it is for this reason that a stoichiometric ratio of primary NH2 radicals in amino groups A of compounds (i) to acetoacetyl groups in compounds (ii) close to 1.0 is preferably used in the first stage of the method for the preparation of (2c). This ratio is particularly preferably 0.8 to 1.0. However, it may also be above 1.0. In this case, not all primary amino radicals are converted, which are then however additionally available for reaction with diketenes (iii). This procedure is technically possible but is not preferred.
- In the method for the preparation of (2c), the acetone adducts of diketenes (iii) can also be used as said diketenes. Preferably used diketenes (iii) are
- or their acetone adducts.
- In the method for the preparation of (2c), the stoichiometric ratio of secondary —NH groups in amino groups A of compounds (i) to diketenes (iii) is 5:1 to 0.5:1, preferably 2:1 to 0.8:1, in the subsequent reaction with diketenes (iii). A ratio of about 1:1 is particularly preferred.
- The method for the preparation (2c) can be effected in the presence of organic solvents or the products (2c) according to the invention can be diluted with organic solvents.
- The reaction of the compounds (ii) with aminosilicon compounds (i) in the first stage of the method for the preparation of (2c) takes place spontaneously even without external heating but supply of heat accelerates the synthesis of (2c).
- The method for the preparation of (2c) is preferably carried out at temperatures of 10 to 100° C., preferably 40 to 80° C. Furthermore, the method is preferably carried out at the pressure of the ambient atmosphere but can also be carried out at higher and lower pressures.
- The treatment of the cellulose-containing fibers or planar structures containing cellulose-containing fibers can be effected in two different variants of the method.
- In one variant of the method, the treatment of the cellulose-containing fibers or planar structures containing cellulose-containing fibers is effected preferably first with (1) compounds having at least two primary amino groups and subsequently with (2) compounds having at least one β-ketocarbonyl group.
- The application of the compound (2) is effected only after the action of the compound (1) on the cellulose-containing fibers or planar structures containing cellulose-containing fibers.
- In a second variant of the method, the treatment of the cellulose-containing fibers or planar structures containing cellulose-containing fibers is preferably effected with a mixture of (1) compounds having at least two primary amino groups and (2) compounds having at least one β-ketocarbonyl group, the mixture of (1) and (2) being prepared before the treatment. Thus, a premix of (1) and (2) is first prepared and the premix is then applied to the cellulose-containing fibers or planar structures containing cellulose-containing fibers.
- In the method according to the invention, compounds (1) and (2) are used in amounts such that the compounds (1) are used in amounts of preferably 0.1 to 1000 mol, preferably 0.5 to 500 mol, particularly preferably 1.1 to 500 mol of amino group, based in each case on 1 mol of β-ketocarbonyl group in compounds (2).
- Examples of cellulose-containing fibers which are treated according to the invention are all cellulose-containing fibers and all aqueous cellulose-containing slurries from which paper products can be produced, such as bleached fibers, recycled fibers, fibers which are produced via chemical digestion methods, such as the sulfate or sulfite method, fibers which are produced from vegetable raw materials (fibrous plants) and which have a sufficient cellulose content, and mechanical pulps which are produced predominantly by mechanical defibration of wood. The cellulose fiber-containing materials are materials such as wood, grass fibers, straw, bamboo, corn fibers and hemp, in each case in any desired forms, such as scraps, chips or sawdust.
- Examples of planar structures containing cellulose-containing fibers are all paper products produced from cellulose-containing fibers, such as paper towels, toilet paper, tissues, kitchen paper, paper napkins, facial tissues.
- The paper to be treated according to the invention may be low-quality paper varieties, such as absorptive papers, including base paper, i.e. kraft paper not pretreated with chemicals and/or polymeric natural substances having a weight of 60 to 150 g/m2, unsized papers, paper having a low freeness, wood-containing papers, unglazed or uncalendered papers, papers which are smooth on one side owing to the use of a calendar stack in their production without further expensive measures and are therefore referred to as “papers machine-finished on one side”, uncoated papers and papers produced from paper waste, i.e. so-called waste papers. However, the paper to be treated according to the invention can of course also be high-quality paper varieties, such as low-absorption papers, sized papers, papers having a high freeness, wood-free papers, calendered or glazed papers, glassine papers, parchmentized papers or precoated papers. The boards may also be of high or low quality.
- Preferably, the compounds (1) and (2) are used in the form of aqueous solutions or aqueous dispersions in the treatment of the cellulose-containing fibers or planar structures containing cellulose-containing fibers. In the aqueous solutions or aqueous dispersions, compound (1) is preferably present in amounts of 0.1 to 20% by weight, preferably 0.2 to 10% by weight.
- In the aqueous solutions or aqueous dispersions, compound (2) is preferably present in amounts of 0.1 to 50% by weight, preferably 0.5 to 20% by weight.
- The treatment of cellulose-containing fibers or planar structures containing cellulose-containing fibers can be effected by the methods known in the prior art, in particular by the methods known in the production and finishing of paper products, as described, for example, in U.S. Pat. No. 6,824,650 B2, column 12, line 1 to column 13, line 15.
- The production of paper products as treated according to the invention is described in U.S. Pat. No. 6,824,650 B2, column 15, line 20 to column 19, line 11.
- Some possible treatments are mentioned by way of example:
- The treatment can be effected by metering the compounds (1) and (2)—either individually in successive steps or together as a premix of (1) and (2)—into the aqueous cellulose-containing fiber slurry from which the planar structures containing cellulose-containing fibers, such as paper products, are produced or during the concentration or drying process.
- The treatment can also be effected by spraying the compounds (1) and (2)—either individually in successive spraying steps or together as a premix of (1) and (2)—onto the planar structures containing cellulose-containing fibers, such as paper products. The planar structures may be moist or dry during the process.
- The treatment can also be effected by coating the surface of the planar structures, such as paper products, with the compounds (1) and (2)—either individually in successive steps or together as a premix of (1) and (2).
- The treatment can also be effected by impregnating the wet or dry planar structures with the compounds (1) and (2)—either individually in successive steps or together as a premix of (1) and (2)—the planar structures being completely or partly penetrated therewith.
- The invention furthermore relates to paper products containing
- planar structures containing cellulose-containing fibers, the planar structures furthermore containing a combination of
- (1) compounds having at least two primary amino groups and
- (2) compounds having at least one β-ketocarbonyl group.
- The compound (1) and (2) are preferably added to cellulose-containing fiber slurries which are used for the production of the planar structures.
- The compounds (1) and (2) are preferably used in each case in amounts of 0.1 to 50% by weight, preferably 0.2 to 20% by weight, based on the total weight of the dry cellulose-containing fibers or dry planar structures containing cellulose-containing fibers.
- In addition to the compounds (1) and (2), further substances which are usually concomitantly used in the treatment of cellulose-containing fibers or planar structures containing cellulose-containing fibers can also be concomitantly used. An example of further substances are antifoams, dry strength agents, such as (modified) starch, carboxymethylcellulose or (modified) polyacrylamides, softening agents, drainage aids or retention aids.
- The treatment according to the invention is preferably carried out at temperatures of 5 to 60° C., preferably 15 to 35° C. The treatment according to the invention is preferably carried out at the pressure of the ambient atmosphere, i.e. at 1020 hPa, but can also be carried out at higher or lower pressures.
- All tests relate to the combination of (1) with various compounds (2). Exclusively Lupamin 9095 (BASF), a high molecular weight polyvinylformamide having a degree of hydrolysis of about 95% and an amino group concentration of about 3.8 meq/g for the 20% strength aqueous solution (commercial product) was used as compound (1).
- 73.1 g of N,N,N,N-tetrakis(2-hydroxypropyl)ethylene-diamine are heated to 50° C. Thereafter, 92 g of diketene are metered in with cooling so that the temperature of the reaction mixture is kept between 50 and 70° C. The reaction is allowed to continue for a further hour and excess diketene is removed in vacuo at 100° C. A pale orange product having an acetoacetate content of 6.3 meq/g is obtained.
- 250.5 g of a trimethylsilyl-terminated aminosiloxane which contains dimethylsilyloxy and aminoethylamino-propylmethylsilyloxy units and has a concentration of 2.24% by weight of basic nitrogen are mixed with 411.4 g of a polyether acetyl acetate of the average formula CH3O(C2H4O)19.4(C3H6O)17.1C(═O)—CH2C(═O)—CH3 and heated to 70° C. On clarification, the viscosity of the reaction mixture increases sharply, whereupon 70 g of isopropanol are metered in. At 70° C., 16.8 g of diketene are slowly added dropwise, followed by altogether a further 156 g of isopropanol after a further hour. The high-viscosity product has a solids content of 75% and an acetoacetamide content of 0.22 meq/g.
- 400 g of 75% strength solution obtained in example 2 are homogeneously mixed with 0.75 g of isophoronediamine at 25° C. and slowly heated to 40° C. With a considerable increase in viscosity, a clear, high-viscosity polymer solution having an acetoacetamide content of 0.20 meq/g is obtained in 2 hours.
- 13.3 g of the 75% strength solution obtained in example 2 are homogeneously mixed with 10.0 g of the diacetoacetate of PEG 1000 and diluted with isopropanol to 200 g. The clear solution contains 0.105 meq/g of β-ketocarbonyl groups per g.
- 0.1 g of triethylamine and thereafter 20.6 g of diketene are slowly metered into 200 g of a silicone polyether prepared from 2 parts of allylpolyether of the formula CH2═CH—CH2O(C2H4O)10H and 1 part of hydrogen-siloxane of the formula HO(HSiMeO)14.3(SiMe2O)60H. After an exothermic reaction, the batch is kept at 70° C. for a further hour. A pale brownish product which has a viscosity of about 20 000 mm2/s in undiluted form is obtained. The concentration of acetoacetate is 1.10 meq/g.
- 50 g of the polymeric acetoacetate obtained in example 5 are further condensed at 100° C. after dropwise addition of 0.2 g of a 10% strength solution of p-toluenesulfonic acid in THF, with the result that a gel-like high polymer which is soluble in the same amount of isopropanol to give a clear solution is obtained. The 50% strength solution contains aceto-acetate groups at a level of 0.55 meq/g.
- By dilution of a commercially available aqueous solution (Lupamin 9095, BASF) of a high molecular weight polyvinylamine (about 19 meq of NH2 per g) with the same amount of water, a 10% strength solution is prepared. 6.0 g of a 10% strength aqueous solution of the diacetoacetate of PEG 2000 are added to 200 g of this dilution and homogeneously mixed. After 3 days, a clear aqueous solution which no longer contains detectable acetoacetate is obtained. The mixture is a ready-to-use one-component formulation of the compounds (1) and (2). The molar ratio of amino to acetoacetate groups is about 700:1.
- For the preparation of a 10% strength aqueous solution of the combination of compounds (1) with an exclusively monofunctional compound (2), 24 g of Lupamin 9095 (BASF), 67.2 g of water and 4.8 g of ethyl acetoacetate are mixed in succession. A clear colorless mixture is obtained, to which 0.65 g of acetic acid is added after 24 hours. The mixing ratio of amino to acetoacetate groups is about 2.5:1.
- The dry and wet strength of paper towels is tested.
- Regardless of the preparation process, all examples of the compounds (2) are used as a 10% strength aqueous solution. This also applies to the one-component formulation of examples 7 and 8.
- In the case of two-component applications, the polyamine (1) is in principle applied first as a 1% strength aqueous solution by the spray process described below and is dried at 105° C. for 5 minutes. The active substance application of compound (1) is stated in the table and is 0.5 or 0.9% by weight, based on the dry weight of the paper towel.
- The substrate, the paper towel, is preconditioned therewith.
- The specified paper towel having a very low tensile strength is cut to a size of 1×w=15×35 cm. This is placed without creases in a vertical clamping apparatus and sprayed uniformly (3×per sheet of paper towel) from top to bottom using a Sata 200 Dekor spray gun. The settings on the spray gun always remain the same and are 2 bar compressed air with a spray nozzle of 0.5 mm. Depending on amount of product and type, this process is repeated until 4.8-5.2% by weight of active product (=compound (2)) is present on the paper towel. In the table, the active substance application of compound (2) is stated in % by weight, based on the dry weight of the paper towel. This product application is determined by weighing the uncoated and the wet paper towel. The product application is effected on one side. Thereafter, the coated paper towel is dried at 105° C. for 5 min.
-
TABLE Test results of the testing of dry and wet strength of paper towels Compound (2) Polyamine Soft TEA TEA (2) in %* (1) in %* handle (wet) (dry) Example 1 4.9 0.5 − 11 42 Example 2 5.0 0.9 + 11 32 Example 3 4.8 0.5 + 9 32 Example 4 5.0 0.5 + 7 Example 5 5.0 0.5 + 6 23 Example 6 5.1 0.5 + 7 29 Comparison — 0.5 −− 6 42 1 Comparison — 0.9 −− 9 2 Blank — — 0 2 31 sample Example 7** 0.02 0.5 − 8 46 Example 8** 0.5 0.5 − 8 50 *The active substance application is stated in % by weight, based on the dry weight of the paper web. **Polyamine (1) and compound (2) applied premixed. The soft handle was assessed as softer (+) or harder (− or −−) than the blank sample. - Description of the dry breaking strength (cf. DIN EN 29 073 part 3 or ISO 9073-3):
- The paper towel to be tested is cut into at least 10 strips having a minimum length of 152 mm and a width of 25 mm in the running direction.
- Five test specimens thereof are used for measuring the dry breaking strength and 5 for the wet strength.
- The test specimens are clamped in the ZWICK 1446 tensile tester, likewise in the running direction, and the following parameters are set:
- traction speed=0.21 mm/s (12.7 mm/min)
sample length=152 mm (6 inches) - By starting the tester, the force in F-Max [N or g/force], the elongation at F-max [%] and the resulting area (load-elongation curve) TEA or energy up to breaking in [J] are recorded.
- By inputting the weight, it is also possible to determine the tensile force per tex in cn/tex. This process is repeated at least 5 times and the mean value and standard deviation of each parameter is determined.
- Description of the wet breaking strength (cf. DIN ISO 3781):
- In the measurement of the wet breaking strength, the paper towel is moistened in the middle by brief immersion in demineralized water to at least 25 mm to not more than 50 mm. The ends remain dry for clamping. (Cf. also point 8.2 in DIN ISO 3781.) The evaluation and settings are the same as for the dry breaking strength method.
- The energy (in Joule) absorbed by the test strips was compared with the blank sample (TEA=2) and the strips treated only with polyamine (1) (TEA=6 and 9), comparative experiments 1 and 2, respectively. The improvement in the wet strength of the test strips by the additional compound (2) is clear from the higher TEA values, with improved soft handle throughout in the comparison with the test strips treated only with (1). In most cases, even an improvement in the soft handle compared with the blank sample is achieved.
- All test strips proved to be hydrophilic with drop absorption times of less than two seconds.
Claims (23)
1.-18. (canceled)
19. A method for treating a substrate of cellulose-containing fibers or planar structures containing cellulose-containing fibers, comprising treating with a combination of
(1) compounds having at least two primary amino groups and
(2) compounds having at least one β-ketocarbonyl group.
20. The method of claim 19 , wherein the compounds (2) contain β-ketocarbonyl groups of the formula
—Y′—C(O)—CHR4—C(O)—CH2R4
—Y′—C(O)—CHR4—C(O)—CH2R4
or their tautomeric enol form of the formula
—Y′—C(O)—CR4═C(CH2R4)—OH
—Y′—C(O)—CR4═C(CH2R4)—OH
in which
Y′ is —O—, —NR2— or
21. The method of claim 19 , wherein Y′ is —O—.
22. The method of claim 19 , wherein one or both of R2 and R3 are hydrogen.
23. The method of claim 19 , wherein polyamine(s) are used as at least one compound (1).
24. The method of claim 19 , wherein β-ketocarbonyl-functional monomeric compounds (2a) of the formula
L(—Y—C(O)—CHR4—C(O)—CH2R4)e (I)
L(—Y—C(O)—CHR4—C(O)—CH2R4)e (I)
or their tautomeric enol forms
in which
e is an integer from 1 to 20,
L is a monomeric organic radical having the valency or functionality corresponding to the index e in formula (I), and
Y is —O— or —NR2—,
R2 is a hydrogen atom or a monovalent hydrocarbon radical having 1 to 30 C atoms, and
R4 is a hydrogen atom or a monovalent hydrocarbon radical having 1 to 18 C atoms,
are used as compounds (2).
25. The method of claim 24 , wherein e is 2 to 8.
26. The method of claim 19 , wherein β-ketocarbonyl-functional oligomeric or polymeric compounds (2b) of the formula
K(—Y—C(O)—CHR4—C(O)—CH2R4)f (III)
K(—Y—C(O)—CHR4—C(O)—CH2R4)f (III)
or their tautomeric enol forms, in which
f is an integer from 1 to 10,000,
K is an oligomeric or polymeric, organic or organosilicon radical having the valency or functionality corresponding to the index f in formula (III), and
Y is —O— or —NR2—, and
R4 is a hydrogen atom or a monovalent hydrocarbon radical having 1 to 18 C atoms,
are used as compounds (2).
27. The method of claim 26 , wherein an organopolysiloxane radical or an organopolysiloxane-containing copolymer radical is a radical K in the β-ketocarbonyl-functional oligomeric or polymeric compounds (2b).
28. The method of claim 19 , wherein β-ketocarbonyl-functional organosilicon compounds (2c) which contain at least one Si-bonded radical of the general formula
in which
—(Si≡) is the bond to the silicon atom,
R1 is a divalent organic radical having 1 to 6 carbon atoms which optionally contain non-adjacent nitrogen atoms,
R3 is a divalent organic radical having 1 to 6 carbon atoms,
Y is —O— or —NR2—,
R2 is a hydrogen atom or a monovalent hydrocarbon radical having 1 to 30 C atoms, and
R4 is a hydrogen atom or a monovalent hydrocarbon radical having 1 to 18 C atoms,
Z is a divalent to hexavalent organic radical having a monomeric, oligomeric or polymeric structure, which has a weight-based heteroatom content of at least 10%, which is bonded via C atoms,
E1 is a monofunctional terminal group or an Si—C-bonded radical of the formula
29. The method of claim 28 , wherein Z is a polyether or polyester radical.
30. The method of claim 19 , wherein the treatment of the substrate is effected first with
(1) compounds having at least two primary amino groups and subsequently with
(2) compounds having at least one β-ketocarbonyl group.
31. The method of claim 19 , wherein the treatment of the substrate is effected with a mixture of
(1) compounds having at least two primary amino groups and
(2) compounds having at least one β-ketocarbonyl group,
the mixture of (1) and (2) being prepared before the treatment.
32. The method of claim 19 , wherein the compounds (1) are used in amounts of 1.1 to 500 mol of amino group per mole of β-ketocarbonyl group in compounds (2).
33. The method of claim 19 , wherein as the compounds (1) and (2) are used in the form of aqueous solutions or aqueous dispersions.
34. The method of claim 19 , wherein aqueous cellulose-containing fiber slurries are used as cellulose-containing fibers.
35. The method of claim 34 , wherein the compounds (1) and (2) are added to the aqueous cellulose-containing fiber slurries, the compounds (1) and (2) being added
(i) either individually in successive steps or
(ii) together as a premix of (1) and (2).
36. The method of claim 19 , wherein paper products, such as paper towels, are used as planar structures containing cellulose-containing fibers.
37. The method of claim 36 , wherein paper towels are the planar structures.
38. The method of claim 36 , wherein the compounds (1) and (2) are sprayed onto the paper products, the compounds (1) and (2) being sprayed on
(i) either individually in successive spraying steps or
(ii) together as a premix of (1) and (2).
39. A paper product containing
planar structures containing cellulose-containing fibers, the planar structures furthermore containing a combination of
(1) compounds having at least two primary amino groups and
(2) compounds having at least one β-ketocarbonyl group.
40. The paper product of claim 38 , wherein the compounds (1) and (2) are added to aqueous cellulose-containing fiber slurries which are used for producing the planar structures.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006039941A DE102006039941A1 (en) | 2006-08-25 | 2006-08-25 | Process for the treatment of cellulosic fibers or fabrics containing cellulosic fibers |
DE102006039941.2 | 2006-08-25 | ||
PCT/EP2007/058141 WO2008022905A1 (en) | 2006-08-25 | 2007-08-06 | Method for treating cellulose-containing fibers or planar structures containing cellulose-containing fibers |
Publications (1)
Publication Number | Publication Date |
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US20090260769A1 true US20090260769A1 (en) | 2009-10-22 |
Family
ID=38668648
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/438,312 Abandoned US20090260769A1 (en) | 2006-08-25 | 2007-08-06 | Method for treating cellulose-containing fibers or planar structures containing cellulose-containing fibers |
Country Status (7)
Country | Link |
---|---|
US (1) | US20090260769A1 (en) |
EP (1) | EP2054550B1 (en) |
JP (1) | JP2010501741A (en) |
KR (1) | KR20090052354A (en) |
CN (1) | CN101501274A (en) |
DE (2) | DE102006039941A1 (en) |
WO (1) | WO2008022905A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105862155A (en) * | 2016-04-08 | 2016-08-17 | 江南大学 | Method for enhancing wet strength of taxus chinensis fibers by use of silane coupling agent |
US20190309468A1 (en) * | 2016-11-16 | 2019-10-10 | Wacker Chemie Ag | Dispersions of beta-ketocarbonyl-functional organosilicon compounds |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6413055B2 (en) * | 2014-10-09 | 2018-10-31 | サンノプコ株式会社 | Paper strength enhancing aid, paper strength enhancing agent, and method for producing paper strength enhanced paper |
CN105780474B (en) * | 2016-05-27 | 2018-04-20 | 东华大学 | A kind of durable hydrophobic finishing method of cotton fabric |
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Also Published As
Publication number | Publication date |
---|---|
DE102006039941A1 (en) | 2008-02-28 |
KR20090052354A (en) | 2009-05-25 |
EP2054550B1 (en) | 2009-12-02 |
JP2010501741A (en) | 2010-01-21 |
CN101501274A (en) | 2009-08-05 |
WO2008022905A1 (en) | 2008-02-28 |
EP2054550A1 (en) | 2009-05-06 |
DE502007002220D1 (en) | 2010-01-14 |
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