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
  • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
  • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
  • D21H11/20—Chemically or biochemically modified fibres
  • D21H11/22—Chemically or biochemically modified fibres cationised
• • 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
  • D21H27/18—Paper- or board-based structures for surface covering

Definitions

• the invention relates to a decorative base paper and under Use of the same made decorative films or decorative laminates.
• Decorative coating materials so-called Decorative papers or decorative films are preferably used Surface coating in furniture manufacturing and in Interior fittings used.
• Decorative foil is understood a resin-impregnated or resin-impregnated and surface treated, printed or unprinted Paper web.
• Decorative films come with a backing plate glued or glued.
• Laminates high pressure Laminates
• the structure of these laminates consists in general from a highest surface resistance producing transparent overlay, one resin-soaked decorative paper and a phenolic resin Kraft paper. As a basis for this, for example Hardboard and chipboard as well as plywood used.
• the decorative paper impregnated with synthetic resin is pressed directly onto a base, for example a particle board, using a low pressure.
• the decorative paper used in the coating materials mentioned above is used in white or color with or without additional printing.
• Decorative base papers generally consist of bright white Sulphate pulps, mainly from hardwood pulp, up to 45% pigments and fillers as well as wet strength agents, Retention aids and fixatives.
• Decorative base papers differ from usual papers by the very much higher filler content and the lack of one when Paper with normal mass sizing or surface sizing the known sizing agents such as alkyl ketene dimers.
• Opacity is one of the most important properties of the Decorative base paper. This characterizes the covering ability towards the document. To ensure sufficient The fiber is filled with fillers in large quantities added. For good retention of the fillers in the sheet To achieve this, the pulp will be different Retention agent added. On the other hand, with increasing The pigment content and filler content deteriorate Strength and the impregnation behavior of the paper.
• the strength of the decorative base paper especially the Dry strength, but is for further processing, during transport through the printing press or at Rewinding operations important in the paper machine.
• the object of the invention is therefore a decorative base paper with high mechanical strength, high opacity and sufficient absorbency (impregnation ability) to provide.
• a decorative base paper the from a cellulose fiber and filler containing Paper pulp and, if necessary, customary aids is formed and a mixture of cellulose fibers unmodified and cationically modified Contains pulp.
• Cationically modified pulps are for example known from DAS PAPIER, Issue 12 (1980) p.575-579. Their Use in decorative base papers and the resultant Strength increase can not be the prior art remove.
• the pulp mixture preferably contains a proportion of cationically modified cellulose fibers of at least 5 % By weight, based on the weight of the pulp mixture, contains.
• a portion has proven to be particularly advantageous from 10 to 50% by weight, in particular 10 to 20% by weight, of cationically modified pulp in the pulp mixture proven.
• the cationically modified cellulose contained in the paper pulp has an effective cationic charge of 20 to 300 mmol / kg cellulose, determined according to the internal method No. 4 of the TU Darmstadt. Cellulose fibers with a charge density of 30 to 200 mmol / kg, in particular 30 to 100 mmol / kg, are preferred.
• effective cationic charge is understood to mean a charge density which has been offset against the charge density of the non-cationized pulp.
• the charge density of the pulp depends on the amount of the cationic agent to be used.
• the amount of the cationizing agent can be 0.005 to 200 g / 1 kg of pulp .
• the cationic modification of the pulp fibers can by reaction of the fibers with epichlorohydrin and a tertiary amine take place or by reaction with quaternary ammonium chlorides, such as Chlorhydroxypropyltrimethyl ammonium chloride or Glycidyl trimethyl ammonium chloride.
• the cationization of the pulp fibers can also be carried out by radical grafting of charged monomers, for example [2- (methacryloyloxy) ethyl] trimethyl ammonium chloride (TMAEMA) with neutral comonomers such as acrylamide respectively.
• TMAEMA Trimethacryloyloxy trimethyl ammonium chloride
• Pulp fibers used by a Addition reaction of quaternary, glycidyl-functional Groups containing ammonium compounds with Hydroxyl groups of cellulose modified cationically are.
• the unmodified pulp and the cationic modified pulp are preferably short fiber pulps with an average fiber length of 0.5 to 0.7mm, but also long-fiber pulps or blends both types of pulp can be used.
• Short fiber pulps are, for example, hardwood pulps of aspen, beech or eucalyptus, of which the latter is particularly preferred.
• the pulp has preferably a freeness of 30 to 45 ° SR.
• Suitable fillers are, for example, titanium dioxide, in particular of the rutile type, zinc sulfide, calcium carbonate, kaolin, talc or mixtures thereof.
• a rutile-type titanium dioxide surface-treated with Al 2 O 3 is particularly preferred.
• the proportion of the filler in the decorative base paper can be up to 55% by weight, in particular 20 to 45% by weight.
• the decorative base paper can contain other substances such as organic and inorganic colored pigments, dyes, optical brighteners and dispersants included in the manufacture of the decorative base paper added to the paper suspension become.
• the decorative base papers according to the invention are produced in a known manner in a paper machine in a grammage range from 50 to 200 g / m 2 .
• the pulp mixture of cationically modified pulp and unmodified pulp with a consistency of 2 to 4% by weight is ground to a freeness of 30 to 45 ° SR.
• Filler and wet strength agent are added in a mixing chest and mixed well with the pulp mixture.
• the thick material obtained in this way is diluted to a consistency of about 1% and, if necessary, further auxiliaries such as retention aids, defoamers, aluminum sulfate and, if appropriate, wet strength agents are added.
• This thin material is fed through the headbox of the paper machine onto the wire section. A nonwoven fabric is formed and the decorative base paper is obtained after dewatering, which is then dried.
• Impregnated or impregnated synthetic resin dispersions are conventional synthetic resin dispersions for example those based on polyacrylic or Polyacrylic methyl esters, polyvinyl acetate, polyvinyl chloride or synthetic resin solutions based on phenol / formaldehyde, Urea / formaldehyde or melamine / formaldehyde precondensates or their compatible mixtures.
• the impregnation can also be done in the size press Paper machine done.
• the decorative base paper can be such be impregnated that the paper is not complete is impregnated by.
• Such decorative papers are also known as pre-impregnates.
• the share of that in that Decorative base paper by impregnation of the resin in this case is 25 to 30% by weight, based on the Weight of the paper.
• the soaked papers can still painted and printed and then on a Substrate can be applied like a wooden plate.
• the painted and possibly printed products generally referred to as decorative films.
• Weight percentages refer to the weight of the pulp unless otherwise stated is specified.
• polyamide / polyamine-epichlorohydrin resin were then added to the cellulose suspension and a base paper with a basis weight of 97 g / m 2 was produced there
• the further substances were added to the cellulose suspension as in Example 1 and a base paper with a basis weight of 95 g / m 2 was produced therefrom.
• a pulp mixture of 16.7% by weight of a eucalyptus pulp modified with glycidyltrimethylammonium chloride (Quab® 151) with a charge density of 65.5 mmol / kg and 83.3% by weight of a standard eucalyptus pulp was obtained with a consistency of 3% to ground to a freeness of 38 ° SR.
• the further substances were then added to the cellulose suspension as in Example 1 and raw paper with a basis weight of 95 g / m 2 was produced therefrom.
• the further substances were then added to the pulp suspension as in Example 1 and a 95 g / m 2 paper was made therefrom.
• a cellulose mixture of 16.7% by weight of a eucalyptus cellulose modified with 2- (methacryloyloxy) ethyltrimethyl ammonium chloride and acrylamide with a charge density of 153.7 mmol / kg and 83.3% by weight of a standard eucalyptus cellulose was prepared in accordance with Example 1 and processed with the same substances (pigment and wet strength agent) to a base paper with a basis weight of 96 g / m 2 .
• a pulp suspension of 100% by weight of standard eucalyptus pulp with a consistency of 3% and a degree of pulping of the pulp fibers of 36 ° SR was added to substances according to Example 1 and a base paper with a basis weight of 94 g / m 2 was produced therefrom.
• Measurement method developed in cellulose is a colorimetric method.
• the colorimetric method uses dye ions of the dye methyl orange to Neutralize the charges in and on the fiber.
• the used solution depletes of dye ions. This Decrease in concentration is in a UV spectrometer detected.
• the amount of by cationic groups adsorbed methyl orange is calculated from the Difference of colorimetric in the blank determined and that in the sample supernatant colorimetric determined amount of methyl orange.
• the content of cationic groups are given in mmol / kg pulp.
• the purpose of the exam is to assess a person's ability Decor paper to incorporate a melamine resin.
• 2 test strips (15 x 100 mm) in melamine resin MW 550 submerged, over a flat surface between two strips Blotting paper placed with a coating weight for 15 s loaded and then weighed back. The calculation the resin absorption takes place in% of the weight.
• the opacity is a measure of the translucency of the Paper. It was on paper test strips of a size of 8 x 8 cm with the help of the Elrepho 2000 color measuring device measured.
• wet strength can be increased by increasing the proportion Wet strength agents or by adding anionic substances brought to the desired level.

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• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Biochemistry (AREA)
• Paper (AREA)
• Laminated Bodies (AREA)

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• 1999
  • 1999-03-18 DE DE19912149A patent/DE19912149C2/de not_active Expired - Lifetime
• 2000
  • 2000-03-11 DE DE50008377T patent/DE50008377D1/de not_active Expired - Fee Related
  • 2000-03-11 ES ES00105181T patent/ES2231060T3/es not_active Expired - Lifetime
  • 2000-03-11 PT PT00105181T patent/PT1036881E/pt unknown
  • 2000-03-11 SI SI200030528T patent/SI1036881T1/xx unknown
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