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
  • 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
  • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • D21H17/41—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups
  • D21H17/42—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups anionic
  • D21H17/43—Carboxyl groups or derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F8/00—Chemical modification by after-treatment
  • C08F8/30—Introducing nitrogen atoms or nitrogen-containing groups
  • C08F8/32—Introducing nitrogen atoms or nitrogen-containing groups by reaction with amines
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F2800/00—Copolymer characterised by the proportions of the comonomers expressed
  • C08F2800/10—Copolymer characterised by the proportions of the comonomers expressed as molar percentages

Definitions

• the invention relates to a process for the surface sizing of paper using statistical copolymers of maleic anhydride and dicyclopentadiene or of reaction products of these copolymers.
• copolymers containing succinimide groups can be used for the paper surface sizing, and vinylogous compounds are used as comonomers in their production.
• Dicyclopentadiene is mentioned as a possible vinyloge.
• the copolymers described for paper sizing soluble they must be reacted with ammonia, alkali metal solutions or amines. Because of the imide groups contained, a large number of descendants arise.
• copolymers of maleic anhydride and dicyclopentadiene which do not contain an imide structure - and thus save on a complex process in manufacture - are highly effective paper sizing agents which are equivalent or superior in their effectiveness to those described above and both on unsized and in the pre-sized paper have excellent sizing properties.
• the use of such copolymers has hitherto not been known for paper sizing.
• the invention therefore relates to anionic surface sizing agents based on aqueous solutions of random maleic anhydride copolymers, which are characterized in that they are prepared from maleic anhydride and dicyclopentadiene.
• the statistical copolymers according to the invention are obtained in a manner known per se by polymerizing as a suspension or solution polymerization in aliphatic or aromatic hydrocarbons, such as, for. As toluene or xylene, in alcohols, such as. B. ethylene glycol or ethyl glycol, or in ethers such as. B. ethylene glycol dimethyl ether or dioxane at temperatures between 60 and 150 ° C, preferably between 70 and 90 ° C, in the presence of radical initiators.
• Azo compounds, peroxides or hydroperoxides can serve as initiators, e.g. B. azobisisobutyronitrile, di-benzoyl peroxide or di-tert-butyl peroxide.
• the initiators are preferably used in amounts of 2 to 6 percent by weight of the comonomers.
• copolymers according to the invention which contain anhydride groups, water-soluble, they are converted into their salts with bases.
• carboxyl groups need to be neutralized, since a degree of neutralization of 80%, based on the number of all carboxyl groups, is generally sufficient.
• ammonium and / or mono-, di- or trialkylammonium with a total of up to 6 carbon atoms and alkali ions come into consideration as cations.
• the copolymers according to the invention in the form of their reaction products with ammonia or primary aliphatic or aromatic amines, such as. B. ethylamine or aniline, or secondary amines, such as. As diethylamine, morpholine or pyrrolidine and / or aliphatic alcohols use.
• reaction products also have excellent paper sizing properties.
• the amount of the copolymers according to the invention required for paper sizing is between 0.01 and 3, preferably between 0.1 and 1 percent by weight, based on the weight of the paper.
• copolymers used as paper sizing agents in the sense of the invention can be combined with anionic starches customary for paper sizing.
• the glue liquors obtained in this way can be required if the usual additives are added.
• the processing can take place according to the usual technologies in paper production.
• Maleic anhydride and dicyclopentadiene are polymerized in toluene as a solvent and in the presence of benzoyl peroxide as an initiator in a molar ratio of 1: 1.
• gaseous ammonia is introduced into the polymerization slurry obtained until the required. Nitrogen value is reached. After the solvent residues have been removed, a white powder with a softening point above 270 ° C. is obtained.
• a state-of-the-art copolymer of maleic anhydride and styrene as a half amide is used as the reference substance.
• Sizing agents I to II are combined with an anionic corn starch, which is commercially available under the name Amisol 5591® from Maizena, to form 10% glue liquors.
• the solids ratio of sizing agent to starch is 1.5: 8.5.
• These liquors are applied on a laboratory size press to unsized 80 g paper so that the amount of sizing agent applied is 0.6% of the paper weight.
• the paper is dried in the size press at 140-160 ° C in approx. 5 seconds.
• the size values obtained are shown in Table 1. The effectiveness of the sizing agents according to the invention is convincingly evident.
• Example 2 Analogously to Example 1, the sizing agents I-II are formulated into liquor liquors and applied on a laboratory size press, with the difference that paper pre-sized with 0.8% resin size in the mass is used. The sizing values obtained are shown in Table 2. The advantage of the sizing agent 1 according to the invention over the comparison sizing agent II can be clearly seen.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Paper (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=6011812

Family Applications (1)

Country Status (10)

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Family Cites Families (9)

• 1977
  • 1977-06-18 DE DE19772727510 patent/DE2727510A1/de not_active Withdrawn
• 1978
  • 1978-06-12 IT IT24430/78A patent/IT1096705B/it active
  • 1978-06-14 DE DE7878200042T patent/DE2861751D1/de not_active Expired
  • 1978-06-14 EP EP78200042A patent/EP0000221B1/de not_active Expired
  • 1978-06-15 ES ES470820A patent/ES470820A1/es not_active Expired
  • 1978-06-15 AT AT0436178A patent/AT364910B/de not_active IP Right Cessation
  • 1978-06-16 DK DK273178A patent/DK273178A/da not_active Application Discontinuation
  • 1978-06-16 US US05/916,124 patent/US4200559A/en not_active Expired - Lifetime
  • 1978-06-16 JP JP7226378A patent/JPS546911A/ja active Pending
  • 1978-06-16 FI FI781927A patent/FI62876C/fi not_active IP Right Cessation
  • 1978-06-16 NO NO782107A patent/NO150645C/no unknown

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