LU85195A1 - FORMALDEHYD-BONDING AGENT - Google Patents

Description

4 '- 1 - 5 formaldehyde-binding middle 1

Panels, such as chipboard and the like, are made using wood cellulose material. The preferred adhesives (or glues) are those based on formaldehyde, such as urine-10 substance-formaldehyde, melamine-formaldehyde, phenol-formaldehyde and resorcinol-formaldehyde resins or mixtures thereof.

It is a well known fact that boards made using these adhesives have a formaldehyde odor that is both harmful and unpleasant. Formaldehyde is emitted both during the manufacture of such panels and during their storage and end use.

Many methods of preventing formaldehyde emission 20 have been proposed, but they are all either ineffective or degrade the properties of the panels or require complicated application procedures. Some of these methods include spraying or coating by brushing the hot plates out of the press with various solutions, such as solutions of urea and / or ammonia or ammonium salts. In general, processes of this type are not desirable for industrial use because they require additional process steps and in any case are not very effective.

Other methods involve the use of very complex mixtures of a large number of components, some of which are natural glues. These products are also not very effective. One of their drawbacks is due to the fact that the properties of natural products are not constant.

5 “Another method for reducing the free formaldehyde content involves the use of a 5: aqueous suspension of urea granules coated with a special wax and produced by spray crystallization.

10 This process also requires a separate feed line, 'because the product is not added to the adhesive formulation itself'.

The object of the present invention is to provide a formaldehyde-binding agent which effectively reduces the odor of formaldehyde without deteriorating the properties of the plate, without changing the reactivity of the adhesive formulations and without any additional steps in the preparation of chipboard, plywood or blockboard.

The invention relates to a formaldehyde-binding agent for use in boards made from wood cellulose materials using formaldehyde-based adhesives; the invention-c. According formaldehyde-binding agent is characterized in that it has a solution of (a) at least one organic hydroxyl compound with the exception of monohydric aliphatic alcohols with 1 to 4 carbon atoms and (b) at least one amide in water. The formaldehyde-binding agent can also contain (c) il * * - 3 - an organic compound which acts as a solvent for (a) and (b) and which also reacts with formaldehyde, and / or (d) a water-soluble inorganic compound . The organic compound (c) is preferably a monohydric aliphatic alcohol having 1 to 4 carbon atoms. The inorganic compound (d) is preferably a hydrogen halide salt. Even if the individual components are not soluble in water, they can dissolve in water if a mixture of them is heated to 70 ° C in water.

The organic hydroxyl compounds [component (a)] are preferably soluble in water or in lower monohydric aliphatic alcohols. Examples 15 of such preferred hydroxyl compounds are dihydric, trihydric and pentavalent alcohols containing up to 6 carbon atoms, bis. monosaccharides containing up to 6 carbon atoms, disaccharides and polysaccharides containing up to 12 carbon atoms with a 20 Ostwald viscosity of up to 200 mPas at 25 ° C. and a concentration corresponding to 37% refraction. Other examples of preferred hydroxyl compounds are aromatic alcohols and phenols, which are preferably used alone or in combination with one or more of the above-mentioned dihydric, trihydric and / or pentavalent alcohols and / or monosaccharides, disaccharides and / or * polysaccharides. The phenols and aromatic alcohols can be monohydric or polyhydric phenols or monohydric or polyhydric aromatic alcohols containing only one benzene ring.

Specific examples of suitable organic hydroxyl compounds are monoethylene glycol, diethylene glycol, glycerin, pentaerythritol, fructose, mannose, sorbitol, // Λ _ n _

Dextrose, sucrose, maltose, lactose, dextrin, phenol, resorcinol, hydroquinone and the like.

The amides [component (b)], 5 which are used in the formaldehyde-binding agent according to the invention are preferably also soluble in water or in lower monohydric aliphatic alcohols. Aliphatic amides containing up to 6 carbon atoms and aro- containing only one benzene ring are particularly preferred. 10 matical amides.

Suitable examples of amides are urea, thiourea, formamide, acetamide, benzamide, oxamide, sucinamide, malonamide and the like.

3.5

If desired, the formaldehyde-binding agent according to the invention for increasing the solubility may additionally contain additives [component (c)] which are lower monohydric aliphatic alcohols, such as methanol, 20 ethanol, isopropanol and the like.

A cheaper and more effective formaldehyde-binding agent is obtained if inorganic compounds [component (d)] are added which preferably contain hydrogen halide salts, in particular halides of alkali metals or alkaline earth metals, such as sodium. Chloride, potassium chloride and calcium chloride.

"The weight ratio of organic hydroxyl compound [component (a) and component (c), if present] and inorganic compound [component (d), if present] to amide [component (b)] is preferably 10: 100 to 400 : 100, in particular 10: 100 to 200: 100. The formaldehyde-binding agent according to the invention

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5 can be added to the conventional size formulations in amounts of 1 to 10%, preferably 3 to 7%, of solids of the formaldehyde-binding agent, based on the weight of the liquid resin which contains 65% by weight of resin solids will.

The formaldehyde-binding agent according to the invention can contain 20 to 80% by weight, preferably 50 to 70% by weight, of the active constituents [components (a) and (b) and components (c) and / or (d ), if available] included. The water content of the formaldehyde-binding agent depends on the solubility of the active ingredients and the amount of water that can be tolerated in the glue formulations.

3-5

The formaldehyde-binding agent of the present invention can be prepared by simply adding the active ingredients and water to a mixer and mixing until the active ingredients are dissolved. This can be done at 20 room temperature or at an elevated temperature up to 70 ° C.

The formaldehyde-binding agent according to the invention can be used whenever materials made from wood cellulose using adhesives based on formaldehyde, such as urea-formaldehyde or melamine-formaldehyde-1; hyd, phenol-formaldehyde or resorcinol-formaldehyde resins or mixtures thereof, plates can be produced.

If the formaldehyde-binding agent according to the invention is used, it is possible to produce plates which actually contain less than 10 mg of free formaldehyde per 100 g of the dry plate, determined using the perforator method No.EN 120 from F.E.S.Y.P. (Fédération Euro- f

/ J

"- 6 - péenne des Syndicats des Fabricants de Panneaux de Particules), included. '

The amount of reduction in free formaldehyde-5 hyd depends on many factors and can therefore vary within wide limits. If the emission of free formaldehyde is high (higher than 50 mg formaldehyde per 100 g of the dry plate) the reduction can be high and can be 60 to 85%. If the emission of free formal-10 dehyde is relatively low, i.e. 20 to 50 mg of free formaldehyde per 100 g of the dry plate, the maximum reduction is usually 50 to 60%. The amount of reduction achieved also depends on the amount of formaldehyde-binding agent used: the more 15 formaldehyde-binding agent used, the lower the amount of free formaldehyde.

Surprisingly, when the active ingredients of the formaldehyde-binding agent are used in combination, the reduction in free formaldehyde is much greater than the sum of the effects of the separate components and has no adverse effect on the reactivity of the size formulation or the properties of the panels.

25th

The following examples illustrate the invention.

* · Parts and percentages are based on weight.

Example 1 30 In this example, the hydroxyl group-containing organic compound is glycerol and the amide is urea. The synergistic behavior of these two compounds is explained here. Various glue formulations are made, and each is then used to make chipboard.

The comparison does not contain any of components 5 of the formaldehyde-binding agent according to the invention. v Sample 1 contains both glycerin and urea, sample 2 contains only glycerin, and sample 3 contains. only holds urea.

10 It can be seen from the tables below that glycerin, when used on its own (sample 2), is a very effective formaldehyde-binding agent, while urea (sample 3) is a worse reduction in formaldehyde and less mechanical Properties and water resistance; however, when urea is used in combination with glycerin (sample 1), values are obtained which are equivalent to those obtained with glycerol alone.

20th

One can therefore use a cheaper and less effective product (urea) and make it react as effectively as a more expensive and effective product (glycerin). The effectiveness relates to the formaldehyde absorption capacity and to the maintenance of good mechanical properties and a: good water resistance without changing the reactivity of the glue formulation and without the need to use any special apparatus for its use.

In this case, the formaldehyde reduction is indeed M6%.

// - 8th -

The formulations of the various samples used are as follows:

Sample 1 Sample 2 Sample 3 5% by weight% by weight

Parts parts parts

Glycerin (100 ^ -ig) 270 590

Urea (100ï) from 320 - 590

Water 4l0 410 '410 10 1000 1000 1000% solids 59 59 59

The glue formulations used are as follows: 15

Comparison 123 g g g g

Urea-formaldehyde resin 65% 3077 3077 3077 3077 20 (molar ratio F: H 1.27: 1) hardener 400 400 400 400 (ammonium chloride 15%); 25 paraffin emulsion 50% 250 250 250 250 = - ammonia 25 ° Baume 5 555

Sample 1 - 308

Sample 2 - - 308 -

Sample 3 - 308 30 water 268 - - -

Total 4000 4040 4040 4040

Gel time in sec 68 68 71 62/1 iii {'! ^ ·

A

- 9 -!

Single-layer panels are produced in the laboratory9 by spraying each of these formulations onto 25 kg of wood chips. Plates are pressed at 10 and 9 and 8 seconds / mm. The thickness of the plates is 15.3 mm. The temperature of the press is 200 ° C, p and the pressure is 35 kg / cm. The dimensions of the plates produced are 40 x 56 cm.

The results obtained are summarized in the table below-10; they are averages.

Comparison 1 '2 _3

Density (kg / m ^) 683 669 663 657 15 Flexural strength (N / mm2) 19.9 18.1 17.3 16.3

Tensile strength (N / mm2) 0.73 0.72 0.71 0.63 2-hour swelling (%) 5.2 4.9 4.5 5.4 24-hour swelling {%) 51.4 49 , 9 47.4 53.1

Free formaldehyde 15.8 8.5 8.7 11.7 20 (mg / 100 g dry plate)

Example 2

This is another example that illustrates the synergistic behavior of glycerin and urea in reducing the free formaldehyde in chipboard while the mechanical properties of the '; Panels as well as water resistance are maintained.

The comparison does not contain any of the components of the formaldehyde-binding agent according to the invention.

Sample 1 contains both components of the formaldehyde-binding agent according to the invention, and sample 2 contains only one of the two components (the most effective of the two components).

Again, it is found that only sample 5 1 gives a free formaldehyde content below 10 mg per 100 g of dry plate (which is the desired value for class E 1), and the only sample that is absolutely equivalent mechanical

Has properties and water resistance. The reduction in formaldéhydes is actually 34%

The formulations of the various samples used are as follows: Ί c- sample 1 sample 2 J-5

Parts by weight parts by weight

Glycerin (100 ^ -ig) 128 128

Urea (100%) 424

Water 448 872 1000 1000 20% solids 55.2 12.8

The glue formulations used are as follows:; 25 Comparison 1 2 g_g_g_: urea-formaldehyde resin 65% 3077 3077 3077 (molar ratio F: H = 1.27: 1) 30 hardener 400 400 400 (ammonium chloride, 15%)

Paraffin emulsion $ 50 250 250 250

Ammonia 25 ° Baume 555 // - 11 -

Comparison_1_2_

Sample 1. - 268

Sample 2-268

Water 268 - - 5 Total 4000 4000 4000

Gel time in sec 66 67 69 * Single-layer plates are produced in the laboratory by applying each of these formulations; 10 25 kg wood chips spray. Plates are pressed at 10, 9 and 8 seconds / mm. The thickness of the plates is 17> 3 mm. The temperature of the press is 200 ° C, 2 and the pressure is 55 kg / cm, the dimensions of the plates produced are 40 x 56 cm.

15

The results obtained are summarized in the following table; they are averages.

20 comparison 1_2 ___

Density (kg / m ^) 685 684 687

Flexural strength (N / mm2) 20.7 20.6 19 * 4

Tensile strength (N / mm2) 0.74 0.73 0.67 2-hour swelling (¾) 11.0 7 * 9 8.6 25 24-hour absorption (%) 23.5 32.2 23.7

Free formaldehyde 14.3 9j5 12.3 (mg / 100 g dry plate) 30 Example 3

This example illustrates the effectiveness of monoethylene glycol together with urea as a formaldehyde binding agent.

// hl - 12 -

Two formulations are made: the comparison without any of the components of the formaldehyde-binding agent according to the invention and sample 1 which contains both monoethylene glycol and urea.

5

Boards are produced from these two glue formulations, and it is also proven here that boards are obtained with the formaldehyde-binding agent according to the invention using a urea-formaldehyde resin which provides 10 boards which are normally classified as E 2 (comparison) be classified as E 1 (sample 1).

In this case, the reduction of the formaldehyde is 37%. The formulation of sample 1 used is as follows: 20 sample 1

Parts by weight

Monoethylene glycol 100 / S-ig 360

Urea 100% 365

Water 275 25 1000 1% solids 72.5

The glue formulations used are as follows:; / in 30 - 13 -

Comparison 1 g__g

Urea-formaldehyde resin 65% 3077 3077 (molar ratio F: H 1.27: 1) 5 hardener 400 400 "(ammonium chloride 15JS-ig)

Paraffin emulsion 50 ^ -ig 250 250

Ammonia 25 ° Bàumé 5 5

Sample 1 - 268 10 water 268

Total 4,000 4,000

Gel time in sec 66 60

Single-layer plates 15 are produced in the laboratory by spraying each of these formulations onto 25 kg of wood chips. Plates are pressed at 10, 9 and 8 seconds / mm. The thickness of the plates is 17.3 mm. The temperature of the press is 200 ° C and 2 the pressure is 35 kg / cm. The dimensions of the plates produced are 40 x 56 cm.

The results obtained are summarized in the following table; they are averages.

25; Comparison_1

Density (kg / m ^) 685 684

Flexural strength (N / mm2) 20.7 20.2

Tensile strength (N / mm2) 0.74 0.74 30 2-hour swelling (%) 11.0 8.6 24-hour absorption (%) 23.5 22.6

Free formaldehyde 14.3 9 * 0 (mg / 100 g dry plate) // N * - 14 -

Example 4

This example explains the synergistic behavior of monoethylene glycol and urea.

5 plates are produced from three different formulations: the comparison in which no constituents of the formaldehyde-binding agent according to the invention are used, sample 1, in which both constituents of the formaldehyde-binding agent according to the invention are used, and sample 2, in which only one of these components is used.

It can be seen from the results obtained, given below, that Sample 15 1, which contains both components, is much more effective than Sample 2, which contains only one component (the most effective of the two components).

The reduction in formaldehyde obtained in this case is 32%,

The formulations of the different samples used are as follows:. 25 Sample 1 Sample 2

Parts by weight parts by weight

Monoethylene glycol 100 ^ 230 580

Urea 100 ^ -ig 350

Water 420 420 30 1000 1000% solids 58 58

The glue formulations are as follows: f, f - 15 -

Comparison 1 2 g ..... g ....... g .....

Urine t-ff-Porraald ehyd-Har z 65 * -ig 3077 3077 3077 5 (molar ratio F: H = 1.27: 1) hardener (ammonium chloride 15 # -ig) 400 400 400

Paraffin emulsion 5055-ig '250 250 250

Ammonia 25 ° Baume 555 10 sample 1 268

Sample 2-268

Water 268 - -

Total 4000 4000 4000

Gel time in sec 70 71 76 15

Single-layer panels are made in the laboratory by spraying each of these formulations onto 25 kg of wood chips. Plates are pressed at 10, 9 and 8 seconds / mm. The thickness of the plates be-20 is 17.3 mm. The temperature of the press is 200 ° C, p and the pressure is 35 kg / cm. The dimensions of the plates produced are 40 x 56 cm.

The results obtained are summarized in the following table; these are average values.

Comparison 1_2_

Density (kg / m3) 688 688 687 2 30 Flexural strength (N / mm) 17.6 17.6 17.5

Tensile strength (N / mm2) 0.55 0.60 0.56 2-hour swelling in thickness {%) 6.7 4.9 4.7 24-hour absorption (%) 20.1 20.1 19.5

Free formaldehyde 15.0 10.3 12.3 35 (mg / 100 g dry plate) / fi - 16 -

Example 5

In this example, the use of a resin having a different molar ratio and various addition amounts of the formaldehyde-binding agent itself 5 are explained.

The formaldehyde-binding agent used has the following formulation: 10 parts by weight

Glycerin $ 100 270

100% urea 318

Water 4l2 1000 15% solids 58.8

The glue formulations used in the different samples are as follows: 20 comparison 123 -g g g g

Urea formaldehyde

Resin 65 $ (Molver 3077 3077 3077 3077 ratio F: H = 1.4: 1) 25 hardener 293 380 380 380 (ammonium chloride, 15 $)

Paraffin emulsion 50 $ 250 250 250 250

Ammonia 25 ° Baume 5555

Formaldehyde binding agent - 154 215 375 30 water 375 134 73

Total 4000 4000 4000 4087

Gel time in sec 73 73 72 75 f

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- 21 -

Single-layer panels are made in the laboratory by spraying each of these formulations onto 25 kg of wood chips. Plates are pressed at 10, 9 and 8 seconds / mm. The thickness of the plates is 17a3 mm. The temperature of the press is 200 ° C, 2 and the pressure is 35 kg / cm. The dimensions of the plates produced are * 10 x 56 cm.

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// - 23 -

The results summarized above show that all the samples used give values that are equivalent to the comparison, while the reduction in formaldehyde is of the order of 32 to ^ 7%.

5

Example 7

In this example, three different types of hydroxyl group-containing organic compounds, namely dextrin, phenol and resorcinol, are used.

A monohydric alcohol which acts as an additive and is different from methanol is also explained, namely ethyl alcohol.

3-5

The different types of formaldehyde binding agents that are used are as follows:

Sample 1 Sample 2 Sample 3 Sample 4 20 Monoethylene glycol 230 -

Dextrin - 1 ^ 0

Phenol - - 130

Resorcinol - 130

Methanol - 1 ^ 0 130 130 25 ethanol 80

Urea 350 350 370 370 '' water 3 ^ 0 370 370 370 1000 1000 1000 1000% solids 66 63 63 63

All numbers above are parts by weight. The samples of formaldehyde binding agents are used in this example to replace part of the ή 30 - 24 - j i ji il v * used resin.

The glue formulations used are as follows: 5

Comparison 1 2 3 4 S_S_g_i_g. Urea-formaldehyde- 3077 2770 2770 2770 2770

Resin (molar ratio 10 F: H = 1.27: 1) hardener 400 500 400 450 400 (ammonium chloride, 15% solution)

Paraffin emulsion 50% 250 250 250 250 250 15 ammonia 25 ° Baume 5 -

Formaldehyde binding agent> Sample 1 307

Sample 2 - 307

Sample 3 - 307 20 Sample 4 - 307

Water '268 _ _ _

Total 4000 3827 3727 3777 3727

Gel time in sec 65 64 62 63 63 25 Single-layer plates are produced in the laboratory by spraying each of these formulations onto 25 kg * ’wood chips. Plates are pressed at 10, 9 and 8 seconds / mm. The thickness of the plates is 17.3 mm.

The temperature of the press is 200 ° C and the pressure 2 30 is 35 kg / em. The dimensions of the pressed plates are 40 x 56 cm.

The results are summarized in the following table; they are averages.

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// /. / / - 26 -

The results given above demonstrate that all samples have values equivalent to those of the control containing no formaldehyde-binding agent, although the latter replaces an equivalent amount of urea-formaldehyde resin in the other 5 formulations. In this example, the reduction in formal dehydration varies from 24 to 37%.

Example 8 10 In this example only one type of formaldehyde binding agent is used and the resin is a phenol-melamine-urea-formaldehyde resin.

The formaldehyde-binding agent used has the following formulation:

Parts by weight

Monoethylene glycol 300

Urea 330

Water 370 20 1000

The glue formulations used are as follows:

Comparison 1

25 K p

Phenol melamine urea

Formaldehyde Resin $ 63 _ig 5600 5600 Hardener ($ 15.5 aqueous

Ammonium chloride solution) 840 840 30 paraffin emulsion 50? 150 150

Formaldehyde binding agent - 560

Total 6590 7150

Gel time in sec 73 79 - 27 -

Single-layer panels are made in the laboratory by spraying each of these formulations onto 25 kg of wood chips. Plates are pressed at 10, 9 and 8 seconds / mm. The thickness of the plates is 17.3 mm. The temperature of the press is 200 ° C, p and the pressure is 35 kg / cm. The dimensions of the plates produced are 40 x 56 cm.

The results are in the table below; 10 compiled; these are average values.

'Comparison ...... 1

Density (kg / m ^.) 705 695 15 Flexural strength (N / mm2) 26.2 25s9

Tensile strength (N / mm2) 0.27 0.26 - tensile strength V100 (N / mm2) 2.7 2.6 2-hour swelling (%) 7 »1 6.2 24-hour swelling {%) 12, 0 11.3 20 Free formaldehyde 12.8 7 (mg / 100 g dry plate)

Formaldehyde reduction (%) - 45

The results shown above demonstrate that the formaldehyde-binding agent according to the invention can also be used for phenol-melamine-urea-formaldehyde resins and considerably reduce the emission of free formaldehyde without adversely affecting the properties of the plates.

30th

Example 9

In this example, the formaldehyde-binding agent used contains an inorganic compound ii - 28 - [component (d)], which in this case is sodium chloride.

The formaldehyde-binding agent used has the following formulation 5: i 6

Parts by weight

Monoethylene glycol 100 ^ 270

Urea 1005S-ig 318 10 sodium chloride 100? -Ig '50

Water 362

Total 1000% solids 63.8 15 The used in the different samples

Glue formulations are as follows: i »

Comparison 1 to 20 urea-formaldehyde resin 3077 2770 (molar ratio F: H = 1.27: 1) hardener * 100 * 150 (ammonium chloride, $ 15 solution) 25 paraffin emulsion 50 ^ - 250 250 t ammonia 25 ° Baume 5

Formaldehyde binding agent - 307

Water 268 -

Total * 1000 3777 30 gel time in sec 65 6 * 1

Single-layer plates are made in the laboratory. made by spraying each of these formulations onto /// j - 29 - 25 kg wood chips. Plates are pressed at 10, 9 and 8 seconds / mm. The thickness of the plates is 17.3 mm. The temperature of the press is 200 ° C.

2 and the pressure is 35 kg / cm. The dimensions of the pressed 5 plates are 40 x 56 cm.

The results obtained are shown in the following. compiled the table; these are average values.

10th

Comparison 1 '

Density (kg / m ^) 695 699

Flexural strength (N / mm2) 19.9 19.5

Tensile strength (N / mm2) 0.71 0.73 15 2-hour swelling (%) 7.0 6.6 24-hour swelling (%) 20.5 20.8, free formaldehyde 17 9.5 (mg / 100 g dry plate)

Formaldehyde reduction (%) - 20

The results demonstrate that the sample containing the formaldehyde-binding agent gives values equivalent to those of the comparative sample, despite the fact that the formaldehyde-binding agent replaces part of the urea-formaldehyde resin in the formulation. Reducing the formal. . dehydration is 44%.

if 30

Claims (25)

1. Formaldehyde-binding agent for use in boards made from wood cellulose materials using adhesives based on formaldehyde 10, characterized in that it is a solution of (a) at least one organic hydroxyl compound with the exception of monohydric aliphatic alcohols with 1 to 4 Has carbon atoms and 15 (b) at least one amide in water. 2. Formaldehyde-binding agent according to claim 1, * characterized in that it additionally contains (c) an organic compound which acts as a solvent for (a) and (b) and also reacts with formaldehyde. 3. formaldehyde-binding agent according to claim 2, characterized in that component (c) is a monohydric 25 aliphatic alcohol having 1 to 4 carbon atoms. 4. formaldehyde-binding agent according to one of the c> claims 1 to 3 », characterized in that it also (d) contains a water-soluble inorganic compound 30 fertilizer. 5. formaldehyde-binding agent according to claim 4, characterized in that component (d) is a water-soluble hydrogen halide salt. in - 31 - 5 claims 6. Formaldehyde-binding agent according to claim 5S, characterized in that component (d) is a water-soluble halide of an alkali metal or an alkaline earth metal. 5 7 · formaldehyde-binding agent according to claim 6, characterized in that component (d) is sodium chloride, "- potassium chloride or calcium chloride. ; 10th 8. Formaldehyde-binding agent according to one of claims 1 to 7S, characterized in that component (a) is soluble in water or in a monohydric aliphatic alcohol having 1 to 4 carbon atoms. 15 * 9. formaldehyde-binding agent according to claim 8,; characterized in that component (a) of up to 6 carbon atoms containing dihydric, trihydric and pentavalent alcohols, up to 6 carbon atoms 20 monosaccharides, up to 12 carbon atoms disaccharides and polysaccharides with an Ostwald viscosity up to 200 mPas at 25 ° C. and a concentration corresponding to 37% refraction. 25th 10. formaldehyde-binding agent according to claim 8, characterized in that component (a) is selected from aromatic alcohols and phenols. 11. Formaldehyde-binding agent according to claim 10, characterized in that component (a) is selected from monohydric and polyhydric aromatic alcohols containing only one benzene ring and monohydric and polyhydric phenols. > h ff - 32 -% ♦ r 12. Formaldehyde-binding agent according to one of claims 1 to 11 ', characterized in that component (b) is soluble in water or in a monohydric aliphatic alcohol having 1 to 4 carbon atoms. 5 13. formaldehyde-binding agent according to claim 12, characterized in that component (b) from up to - - to 6 carbon atoms containing aliphatic amides and aromatic rings containing only one benzene ring. . 10 amides is selected. 14. Formaldehyde-binding agent according to one of claims 1 to 13, characterized in that the weight ratio of component (a) plus components 15 (c) and (d), if present, to component (b) is 10: 100 to 400: 100 . 15. formaldehyde-binding agent according to one of claims 1 to 14, characterized in that it contains 20 20 to 80 wt .-% of the active ingredients. 16. A process for the preparation of the formaldehyde-binding agent as claimed in claim 1, characterized in that 25 (a) comprises at least one organic hydroxyl compound, with the exception of monohydric aliphatic alcohols. : 1 to 4'carbon atoms, (b) at least one amide and (c) optionally at least one organic compound, 30 which acts as a solvent for (a) and (b) and also reacts with formaldehyde, and (d) optionally one in water soluble inorganic compound and water at a temperature from room temperature to .// * · - 33 - * 70 ° C mixes. 17. The method according to claim 16, characterized in that one uses as component (c) a monohydric 5 aliphatic alcohol having 1 to 4 carbon atoms. 18. The method according to claim 16 or 17, characterized in that a 10 water-soluble hydrogen halide salt is used as component (d). 19. The method according to claim 18, characterized in that a water-soluble halide of an alkali metal or an alkaline earth metal is used as component (d). 20 Me Alain / fctkävifia / 7 (ß''v y fr 20. The method according to claim 19, characterized in that one uses as component (d) sodium · - * chloride, potassium chloride or calcium chloride. 20th 21; Method according to one of claims 16 to 20, characterized in that component (a) is soluble in water or in a monohydric aliphatic alcohol having 1 to 4 carbon atoms. 25th 22. The method according to claim 21, thereby? indicates that component (a) consists of dihydric, trihydric and pentavalent alcohols containing up to 6 carbon atoms, monosaccharides containing up to 6 carbon atoms 30, disaccharides and polysaccharides containing up to L2 carbon atoms with an Ostwald viscosity of up to 200 mPas 25 ° C and a concentration corresponding to 37% refraction. / _ 34 _ î ... ' 23. The method according to claim 21, characterized in that component (a) is selected from aromatic alcohols and phenols. 24. The method according to claim 23, characterized in that component (a) from only one benzene ring containing monovalent and polyvalent; aromatic alcohols and monohydric and polyvalent phenols is selected. 10 - k - 25. The method according to any one of claims 16 to 24, characterized in that component (b) is soluble in water or in monohydric aliphatic alcohols having 1 to 4 carbon atoms. 15 26. The method according to claim 25, characterized in that component (b) is selected from aliphatic amides containing up to 6 carbon atoms and aromatic amides containing only one benzene ring. 27. The method according to any one of claims 16 to 26, characterized in that the weight ratio of component (a) plus components (c) and (d), if 25, to component (b) is 10: 100 to 400: 100. ? 28. The method according to any one of claims 16 to 27, characterized in that the formaldehyde-binding agent contains 20 to 80 wt .-% # of active ingredients 30. 29. Process for the production of boards from wood cellulose materials using an adhesive based on formaldehyde, characterized thereby- il / a '..................... ~% · - 35 - net that a formaldehyde-binding agent according to any one of claims 1 to 15 is added to the adhesive. 30. Plates produced by method 5 according to claim 29. E 10 t * designs: __________ Z 'planches 15 pages dont ....... A .... psps cs Ssr ^ s ...... <23 ... papes de description ........ 6 de revendication ..... Λ .. £> r = ç: e descriptif Luxembourg, ic -g fEV. is Le Mandataire: 25 J w u ^ 30