DE2710033A1 - COATING AND IMPREGNATION COMPOUND - Google Patents

Description

Rohm and Haas Company, Philadelphia / USA Topping or impregnating compound

The invention relates to coating or impregnation compounds that have a Vinyl addition polymer as well as certain cyclic esters of acrylic acid and / or methacrylic acid contain.

When using aqueous dispersions of emulsion polymers, whose particles are water-insoluble, depends on the effectiveness of the dispersion in terms of the formation of a film after Applying the polymer dispersion to a surface to be painted from the glass transition temperature of the dispersed polymer as well as on the temperature at which the cover is worn lets dry. This is particularly evident from US Pat. No. 2,795,564 which discloses the applicability of many acrylic polymers describes the production of water-based paints. As pointed out in this US patent, the polymer disclosed in

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aqueous dispersion obtained by emulsion polymerization of one or more monoethylenically unsaturated monomers (with a group H ₂ C = C ^) have an apparent glass transition temperature, which depends on the components and the quantitative ratio of such components in the polymer. It is stated that some monomers of this type, such as methyl methacrylate, where styrene, vinyl acetate, vinyl chloride and acrylonitrile are similar in this respect, tend to produce homopolymers which have relatively high glass transition values, the glass transition temperature which is used in this US Pat. PS is described by the symbol T. The monomers mentioned above provide for a homopolymer ization hard polymers, ie polymers having a glass transition temperature or a T. value of more than 20 ^p C. On the other hand, many in this US patent monoethylenically unsaturated monomers to be mentioned that yield relatively soft homopolymers. This characterization refers to polymers with glass transition temperatures or T. values of 20 ° C or less.

Further, it is mentioned in said U.S. Patent that can be obtained by copolymerizing various hard and / or soft monomers in predetermined proportions a copolymer having a predetermined glass transition temperature or a predetermined T ^ value which or from -40 ⁰ C fluctuates up to 150 ⁰ C or above, coatings that are produced from aqueous dispersions of the various polymers can be such that an application of the coating compositions or of water-based paints from such polymers can be carried out at normal temperature or even lower temperature, Good film-forming qualities are obtained if the T. value of the polymer used in each case is not above the ambient temperatures at which the coating is carried out. For example, in general

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Coatings of paints based on water, which contain a polymer with a T. "value of about 15 ⁰ C, are applied at room temperature and result in good film formation by simply drying the applied film in the ambient atmosphere. On the other hand, it contains the coating composition as its primary film-forming component emulsion polymer having a T.-value of more than room temperature, for example about 35 ° C or above, then the film obtained from such a paint elevated temperatures, for example 35 ⁰ C or above can, during drying require to ensure that the Polymer particles sufficiently converge or fuse together to form a continuous film. Some polymers may have a glass transition temperature well above room temperature, e.g. eratures due to an affinity for water (hydrophilicity) of a specific polymerized unit in the dispersed polymer particles. An example of such a monomeric component is vinyl acetate. The hydrophilicity of a polymer, as a result of the fact that it contains a significant proportion of vinyl acetate (or other equivalent hydrophilic monomer), promotes the coalescence of the polymer particles into a continuous film at temperatures below the T. value of such a polymer, as can be determined by a standard test.

The production of water-based paints using polymers with low T. values that ensure compliance Allowing normal room temperatures without the use of a plasticizer results in the formation of films, which in many Cases are very hard and tough after drying. On the other hand, generally requires the use of polymers with high glass transition temperatures, which are significantly above room temperature,

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for example above 35 ° C, generally the presence a permanent or volatile plasticizer (the plasticized polymer has a lower T. value) or compliance a high drying temperature so that good continuous films are produced on the surfaces to be coated.

It has now been found that the incorporation of dicyclopentenyl acrylate and / or dicyclopentenyl methacrylate in aqueous coating compositions, such as water-based paints, which are composed of water-soluble Addition polymers or from aqueous dispersions of water-insoluble addition polymer particles, as they are are obtainable, for example, by emulsion polymerization, such compositions have a previously unattainable versatility can lend without great effort and expense.

The symbol DCPA is used below for dicyclopentenyl acrylate and the symbol DCPMA for the corresponding methacrylate. DCP (M) A is used as a general term that includes a mixture of these two materials or one of these materials is to be understood.

Dicyclopentenyl (meth) acrylate is believed to have the following formula:

R O

t Il

C-O CH- (I)

wherein R is H or -CH ₃ . The (meth) acryloxy substituent can be either in the 5- or 6-position, the commercial

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product is a mixture of the two isanes, DCP (M) A can by adding (meth) acrylic acid to one of the double bonds of dicyclopentadiene.

According to the invention, a coating or impregnation compound is used Made available, which consists of the following components:

(a) an aqueous dispersion or solution of a vinyl addition polymer,

(b) 1 to 200% by weight based on the weight of the vinyl addition polymer, Dicyclopentenyl acrylate and / or dicyclopentenyl methacrylate, and

(c) a desiccant.

It has been found that the addition of a DCP (M) A to coating compositions based on vinyl addition polymers of monoethylenically unsaturated monomers, in particular those with a terminal group HJC = C ^, is extremely beneficial in terms of facilitating the coating and the film-forming effect during drying at normal room temperatures, the hardened film also having greater hardness and toughness as a result of the reactive air-hardening properties of DCP (MJA. In general, a small amount of a drying agent, which is the salt or complex type of polyvalent metal, is used. which is conventionally used to accelerate the oxidation of drying oils is added to accelerate the hardening of the coating film during drying The amount of DCP (M) A in the coating composition can be selected within a wide range depending on the one used Mass, its components and in particular the film-forming polymer contained therein and its apparent glass transition temperature.

This is what matters when adding to an emulsion polymer dispersion

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DCP (M) A has a role that is extremely beneficial. It can serve as a leveling agent as it acts as a plasticizer for the dispersed Polymer particle is used. If the dispersed polymer has a T. value that is above room temperature, for example 35 ° C, so that coating materials such as paints water-based, which are made from the polymer dispersion, do not form a continuous film when dried at ambient conditions, then that much DCP (M) A can be in the polymer dispersion or in the coating composition, which such a polymer dispersion should be mixed in so that the T. value and the effective film-forming temperature are reduced to such an extent that that the masses are able to form continuous films at ambient temperature. At the same time, the product will air dry the films are hard and non-blocking due to the autoxidizable nature of the mass,

If DCP (M) A coatings are based on an aqueous dispersion an emulsion polymer with such a low T. value that a film would be formed at room temperature without DCP (M) A, then similarly the films prepared from the DCP (M) A-containing Polymer mass can be obtained, hardened and tough when air-curing the DCP (M) A.

According to one embodiment of the invention the vinyl addition polymers in the form of water-insoluble particles is dispersed and has an apparent glass transition temperature (apparent second order transition temperature) of -40 to + 150 ⁰ C and preferably from 15 to 100 ⁰ C, in particular from 15 ⁰ C or below , on.

The coating compositions preferably contain one or more drying agents. The drying agent used consists of any polyvalent metal-containing complex or salt that promotes the oxidative hardening of drying oils or catalyzed drying oil-modified alkyl resins. Examples

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for drying agents are various salts of polyvalent metals, such as calcium, copper, zinc, manganese, Lead, cobalt, iron and zircon, which are present as cations. Simple inorganic salts are suitable, for example the halides, especially chlorides, nitrates or sulfates. Salts of organic acids such as acetylacetonates, acetates, Propionates and butyrates are also suitable. The drying agents can also be made from complex reaction products of metal oxides, Acetates or borates and vegetable oils exist. Suitable drying agents are also salts of naphthenic acids or of (Cg-C-jg) aliphatic acids. Examples of the aliphatic Component or fatty acid component or the anion of the salt acting as a drying agent are the components of Naphthenic acids, resin acids, i.e. colophony acids, tall oil fatty acids, linseed oil fatty acids, 2-ethylc apronic acid, lauric acid, palmitic acid, Myristic acid, stearic acid, oleic acid, linoleic acid, Linolenic acid, behenic acid, cerotic acid, montanic acid and abietic acid. Preferred desiccant salts are those of cobalt and manganese such as cobalt octoate, cobalt naphthenate and manganese octoate and naphthenate. Mixtures of different drying agents can also be used. In the "Encyclopedia of Chemical Technology", Kirk-Othmer, Volume 5, published by Interscience Encyclopedia, Inc., New York (1950) on pages 195 * to 205 mentioned drying agents be used.

The amount of desiccant can be very low. It is generally used in an amount of, based on the metal content 0.0005 to 2% based on the weight of the component (b) containing the DCP (M) A is used. The desiccant can Mass may be added prior to storage, provided that such addition is made in the absence of oxygen. One can also add a volatile stabilizer to the mass to inhibit the oxidizing effect of the drying agent or

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AA

to avoid. The mass is then kept in sealed containers to avoid volatilization of the inhibitor. The stabilizing agent can be used in small amounts of 0.1 to 2% by weight, based on the weight of component (b), the containing DCP (M) A can be used. The stabilizing agent is generally a volatile ketone oxime or aldehyde oxime. Specific examples are methyl ethyl ketone oxime, methyl butyl ketone oxime, 5-methyl-3-heptanone oxime, cyclohexanone oxime and butyraldehyde oxime. The addition of such inhibitors is essential when a long stability and useful life of the aqueous masses containing dispersed polymer, DCP (M) A and drying agents, be desired.

The coating compositions can of course contain other materials as indicated in the patent discussed above, for example Pigments, dispersants, sequestering agents, defoaming agents, Humectants, thickeners, bactericides, fungicides, odor modifiers, and others resinous materials in dispersed forms. The various pigments as well as other materials mentioned in the patent mentioned can be used.

In general, the amount of component (b) containing DCP (M) A, which is used in the coating composition, about 1 to 200% by weight and preferably 5 to 150% by weight, based on the weight of the vinyl addition polymer, the represents the main film-forming component of the topcoat. The vinyl addition polymer in the compositions of the invention can consist of any of the polymers described in US Pat. No. 2,795,564. For example, the polymer can contain units of an eC, ß-unsaturated carboxylic acid, such as acrylic acid or methacrylic acid, units of an ester of acrylic acid with a ^ 1 "C ₁ I alkanol and / or an ester of methacrylic acid with a C ₅ -C ₁₈ alkanol as well Units of a (C ₁ -C J-alkyl methacrylate).

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It should be noted that those described in Ug-PS 2,795,564 Acrylic polymers mentioned above are not the only types of vinyl addition polymers that can perform the incorporation of DCP (M) A together with a drying agent can be modified and improved. In the in the mentioned In the copolymer systems described in the patent, the curing component is a lower methacrylate, such as methyl methacrylate, similar Copolymer systems in which the hard lower methacrylate is partially or completely replaced by hardening monomers such as styrene, Vinyltoluene, acrylonitrile, methacrylonitrile, vinyl chloride, vinylidene chloride or vinyl acetate can also be replaced by the Incorporation of DCP (M) A and a drying agent can be improved. Copolymers of such monomers with at least one Cj-Cjo-alkyl acrylate and / or a (C.-C.g) -alkyl methacrylate can be used. However, preferred copolymers are those which contain units of methyl methacrylate and at least one (C.-C.) -Alkyl acrylate, optionally with units of acrylonitrile.

It has been found that the DCP (M) A can also be used in conjunction with aqueous coating systems based on natural latices or synthetic latices consisting of butadiene, chloroprene, styrene / butadiene copolymers, acrylonitrile / butadiene / styrene copolymers and related synthetic rubber systems with low T. values is suitable. Films obtained from these dispersions are also improved in hardness by the incorporation of DCP (M) A together with a drying agent.

The use of DCP (M) A makes it possible to produce hard and tough topcoat films from topcoat materials that contain a polymer contain a low T. value which normally forms a soft film. These benefits can be achieved without using a Achieve plasticizer or at least with a markedly reduced amount of a permanent plasticizer in the masses.

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The incorporation of DCP (H) A 'in the coating masses is not on limited to those compositions in which the film-forming component consists essentially of water-insoluble dispersed particles of a polymer or copolymer, or contains such a polymer. The DCP (N) A can also be used in aqueous solutions of vinyl addition polymers in which the solubility of the polymer is essentially a true solubility is due to a low molecular weight of the polymer containing hydrophilic groups. It can also be added to solutions made of such polymers, which are characterized by the formation of colloidal solutions.

The soluble polymers can reduce their solubility to a high level Content of hydrophilic groups, such as acidic mers, which can be present in acidic form or in salt form, return. Examples such acids are acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic acid, citraconic acid and aconitic acid. The salts can be salts of ammonia, amines, such as dimethylaminoethanol, triethylamine and 2-amino-2-methyl-1-propanol, or of alkali metals, especially sodium, potassium or lithium. In addition to polymers which contain large amounts of acidic units, such as units of polyacrylic acid or polymethacrylic acid, or copolymers, such as, for example Copolymers of 15% methacrylic acid and 85% butyl methacrylate, you can also use copolymers that contain a large amount of Have units containing amide groups, for example acrylamide or methacrylamide units, or polymers which have a large amount of amine units, for example homopolymers of oxazole ± dinylethyl acrylate, or copolymers of the latter amine-containing polymers with up to 20% by weight methyl acrylate. The water solubility can also be due to polymerized mers that contain hydroxyl groups, for example hydroxyethyl acrylate or methacrylate, 2-hydroxypropyl

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acrylate or 3-hydroxypropyl acrylate. The water solubility can also be the result of the copolymerization of two or more types of the aforementioned hydrophylizing monomers. In these cases the DCP (M) A is used together with a drying agent to modify the properties of the finished coating film.

The use of the DCP (M) A in the coating compounds serves various purposes Functions or purposes. In aqueous solutions of water-soluble polymers, adjusting the viscosity is made easier it is easier to pull on without the need to swallow the solution excessively with water or to be diluted with another water-miscible volatile solvent. The DCP (M) A then becomes part of the binder component in air drying and contributes to the solvent resistance, water resistance, alkali resistance, gloss, hardness and the toughness of the cured topcoat films. In coating compounds based on aqueous dispersions of water-insoluble polymer particles, such as those produced, for example, by emulsion polymerization are obtained, the DCP (M) A serves as a leveling agent, hardener, agent to increase the toughness and agent for Control of viscosity. In all cases, the DCP (M) A becomes upon air curing of the coatings comprising the vinyl polymer, DCP (M) A and contain the desiccant, part of the binder in the final cured topcoat films. The admixture of volatile organic solvents to the coating compositions can therefore be avoided, so that environmental pollution, toxicity and the risk of flammability can be avoided.

The non-volatile reactive component can consist essentially of DCP (M) A, which is also preferably the case, if appropriate however, it can also consist of a mixture of at least a larger amount (more than 50 to 100% by weight, for example 51 to 99% by weight) DCP (M) A and a smaller amount (less than 50 to 0% by weight) of another non-volatile reactive

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Ethylenically unsaturated monomeric material consisting of (1) a (C ₁ -C ₂₀ ) aliphatic ester of acrylic acid and / or methacrylic acid, for example (C ₁₀ -C ₂₀ ) -alkyl and ( ^c io "* ^C 2O * ~ Alkenyl acrylates and methacrylates, (2) a vinyl ester of a (C ₁₀ -C ₂₀ ) aliphatic acid and (3) reactive dialkyl esters of maleic acid, fumaric acid or itaconic acid, in which the alkyl group contains 1 to 8 carbon atoms, is selected Improvement of the water, solvent, abrasion and blocking resistance, the compositions according to the invention also contain a non-volatile reactive polyethylenically unsaturated material in a small amount of up to 25% by weight, preferably 2 to 15% by weight, based on the weight of the binder, for example a glycol or polyol (meth) acrylate, for example xethylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,3-butylene glycol di (meth ) acrylate, Ne opentylglycol di (meth) acrylate, pentaerythritol tri- and tetra (meth) acrylate, trimethylolpropane tri (methX acrylate and allyl (meth) acrylates ./ 'Examples of the esters (1) described above are decyl acrylate, isodecyl acrylate, undecyl acrylate, Lauryl acrylate, cetylacrylate, pentadecyl acrylate, hexadecyl acrylate, octadecyl acrylate, the corresponding methacrylates and the unsaturated analogs such as oleyl acrylate or methacrylate, linoleyl (meth) acrylate and linolenyl (meth) acrylate. Examples of (2) are vinyl decanoate, vinyl laurate, vinyl oleate, vinyl palmitate, vinyl myristate and vinyl stearate. Examples of the diesters (3) are dimethyl maleate, fumarate and itaconate, diethyl maleate, fumarate and itaconate, and dibutyl maleate, fumarate and itaconate.

Some preferred embodiments of the invention are illustrated by the the following examples are explained in more detail. All parts and percentages Unless otherwise stated, are based on weight. The temperature specifications are to be understood unless otherwise stated is, in 'Celsius.

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example 1

Coating compounds based on hard latex polymers and DCPMA

The polymer A is an aqueous latex polymer having the following Monomer composition: 43.5 parts of ethyl acrylate, 55.5 parts of methyl methacrylate and 1.0 part methacrylic acid. The latex is neutralized with ammonium hydroxide and has a pH of 9.5. It is also characterized by a solids content of 46.5%, an average particle diameter of 0.11 μ and a T. value from 32 ° C.

The polymer B is an aqueous latex polymer with the following monomer composition: 46 parts of butyl acrylate, 53 parts of methyl methacrylate and 1 part methacrylic acid. The latex is neutralized with ammonia and has a pH of 9.5. He draws furthermore by a solids content of 4 6.5%, a medium one Particle diameter of 0.15 μ and a T. value of 22 ° C.

The polymers A and B are each made into a series of coating compositions by adding DCPMA with stirring and then adding 0.1 part of cobalt (II) as acetylacetonate and 0.25 parts Cyclohexanone oxime made per 100 parts from latex solids and DCPMA. Other coating compositions are produced from polymers A or B in such a way that the volatile flow control agent is added while stirring 2,2,4-Trimethylpentanediol-1,3-monoisobutyrate (commercial product Texanol, Eastman Chemical) is added. The various coating compounds are first tested for their film-forming ability, i.e. their minimum film formation temperature (MFT), examined according to ASTM method D-2354. The results come from the Table I.

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Table I.

Polymeric parts DCPMA or Texanol ^R / MFT ( ⁰ C)

100 parts latex solids visual toughness

A no 38 37

20 DCPMA 4 11

40 DCPMA O O

20 Texanol ^R 5 9

B none 14 19

15 DCPMA <1 2-4

40 DCPIIA <1 <1

15 Texanol ^R <1 2

Coatings are then applied to aluminum test panels in the manner that the film thickness in the dry state is 33 μ. After drying for a period of 4 weeks at ambient conditions, the film properties are determined as follows Table II summarizes.

Table II

Polymeric parts DCPMA or Texanol / Knoop- lead- indentation-100 parts latex solids hardness, number donation *

(KHN) hardness

A no no film - powdered filing

tion 20 DCPMA 7.1 H none

40 DCPMA 10.1 2H none

20 Texanol ^R 0.5 HB massive

B none 1.1 - massive

15 DCPMA 1.6 F light

40 DCPMA 4.0 F track

15 Texanol ^R 0.5 F massive

* A cheesecloth is put on a film under a pressure of 0.14 kg / cm ^a for a period of 2 hours. The extent to which the cheesecloth fibers have left an imprint on the film is examined.

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Λί

Example 2

Coating compounds based on soft latex polymers and DCPMA

The polymer C is an aqueous latex copolymer with the following monomer composition: 53 parts of butyl acrylate, 4-6 parts of methyl methacrylate and 1 part of methacrylic acid. The latex is neutralized with ammonium hydroxide and has a pH of 9.1. It is also distinguished by a solids content of 4 6.5%, an average particle diameter of 0.1 μ, a T. value of 15 ^° C. and an MFT value of 12 ^° C.

The polymer D is an aqueous latex copolymer with the following monomer composition: 70 parts of butyl acrylate, 29 parts of methyl methacrylate and 1 part of methacrylic acid. The latex is neutralized with ammonium hydroxide and has a pH of 9.0. It is characterized further by a solids content of 46.5%, an average particle diameter μ of 0.1, a T. value of -7 ⁰ C and an MFT of <0 ⁰ C from.

The polymers C and D are converted into coating compositions by adding DCPMA with stirring and then adding 0.1 parts Cobalt (II) in the form of the acetate and 0.25 parts of cyclohexanone oxime per 100 parts of latex solids and DCPMA.

The coatings are applied to steel test plates in such an amount that the thickness of the finished films is 38 μ after Drying amounts. After drying at ambient conditions for a period of at least 2 weeks, the coating properties will improve determined. The results are shown in Table III.

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271Q033

Parts of DCPMA
per 100 parts
le latex
solids Table UI pencil
hardness
trek wet Rusting de Poly
meres 0 Relative Knoop
Sticky hardness,
number (KHN) 2B <ζβΒ strong C. 40 none 0.34 HB 5B none 0 none 0.50 5B strong D. 40 sticky 0.20 5B moderate 80 sticky 0.23 3B track 120 easy 0.35
Adhere 2 B none Example 3 very light- 0.65
gluing

Pigmented latex paint containing DCPMA

Pigment dispersions are made by grinding the following ingredients made in a Cowles dissolver for 15 minutes at 1650 meters per minute.

material

Dispersant (Tamol 731, 25%) defoamer (Nopco NDW) propylene glycol
Rutile TiCU

Parts by weight

10.8 2.0 59.8 270.0

The following are added to the above dispersions with stirring Materials added:

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SLO

material

Propylene glycol
water

Latex polymer B according to Example 1 (46.5%)

DCPMA

Cyclohexanone oxime

Cobalt (II) acetylacetonate

Texanol ^R

Hydroxyethylene cellulose (2.5% in water) (Natrosol 250MR)

water

painting
medium A painting
medium B painting
medium C 69 32.2 - - 30.0 30.0 376 313.4 267.7 - 28.8 49.4 - 0.43 0.44 - 0.76 0.77 26th 0 0 49.1 71.6 80

38.7

86.9

All paints have a pigment concentration of 30% by volume, has a pH of about 9.1 and a Stormer viscosity of about 80 to 85 Krebs units. The paintings will applied to steel test plates in such an amount that the thickness of the dry films is 28 μ. After drying Over a period of 2 weeks under ambient conditions, the upper tensile properties are determined, as shown in the following Table IV summarizes:

Table IV

Paint A

Knoop hardness, OKHN number) 1.4

Pencil hardness B

Continuous impact strength (m-kg) 5.53 indentability (60 ° C / 0.14 kg / cm ^a / 30 minutes)

Face to face blocking (60 ° C / 0.14 kg / cm * / 60 minutes)

easy
strong

Paint B medium C

2.1

HB

5.53

track
little

3.5

HB

5.53

not easy

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- ve -

TAMOL is a registered trademark of the Rohm and Haas Company NOPCO is a registered trademark of NOPCO Chemical Company NATROSOL is a registered trademark of Hercules Incorporated

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Claims (13)

Claims 1. Covering or impregnation compound, characterized by (a) an aqueous dispersion or solution of a vinyl addition polymer, (b) 1 to 200 parts by weight based on the weight of the vinyl addition polymer, Dicyclopentenyl acrylate and / or dicyclopentenyl methacrylate, as (c) a desiccant. 2. Composition according to claim 1, characterized in that the component (b) from more than 50 to 100% by weight of dicyclopentenyl acrylate and / or methacrylate and less than 50 to 0% by weight consists of one or more of the following: (1) a C. q-C _-- aliphatic ester of acrylic acid and / or Methacrylic acid, (2) a vinyl ester of a C ₁ gCQ aliphatic acid, (3) a dialkyl ester of maleic acid, fumaric acid or itaconic acid, wherein the alkyl groups contain 1 to 8 carbon atoms. 3. Mass according to one of claims 1 or 2, characterized in that that it contains a volatile aldehyde oxime or ketone oxime as a stabilizing agent. 4. Composition according to one of claims 1 to 3, characterized in that the vinyl addition polymer is dispersed in the form of water-insoluble particles and has an apparent glass transition temperature of -40 to +150 ⁰ C, 5. A composition according to claim 4, characterized in that the vinyl addition polymer has an apparent glass transition temperature of 15 to 100 ⁰ C. 709837/0885 ORIGINAL INSPECTED 6. Composition according to claim 4, characterized in that the vinyl addition polymer has an apparent glass transition temperature of 15 ⁰ C or below. 7. Composition according to one of claims 1 to 4, characterized in that the vinyl addition polymer units of at least one OC , ß-unsaturated carboxylic acid, units of at least one ester of acrylic acid with a C.-Cg-alkanol and / or an ester of methacrylic acid with a C ₅ -C ₁ g -alkanol and units of at least one C. _{-C 4} -alkyl methacrylate. 8. Composition according to claim 4, characterized in that the vinyl addition polymer is a copolymer which contains units of at least methyl methacrylate, acrylonitrile, vinyl chloride, vinylidene chloride, vinyl acetate, styrene or vinyl toluene and units of at least one C -C -alkyl acrylate and one (C ₄ -C ₁₈ ) alkyl methacrylate. 9. Composition according to claim 6, characterized in that the vinyl addition polymer is a copolymer which contains units of methyl methacrylate and at least one (C ₁ -C ₄ ) -alkyl acrylate. 10. Composition according to claim 9, characterized in that the vinyl addition polymer also contains units of acrylonitrile. 11. Mass according to one of claims 1 to 3, characterized in that that the vinyl addition polymer is dissolved in the aqueous phase and contains units with hydrophilic groups consisting of hydroxyl, Consist of carboxyl, amide and / or amine, 12. Mass according to one of the preceding claims, characterized in that that the desiccant is a salt or complex of a polyvalent metal and 0.0005 to 2% by weight calculated as Amount of metal that makes up component (b). 709837/0885 13. Composition according to one of claims 3 to 12, characterized in that that the amount of stabilizing agent is between 0.1 and 2% by weight of component (b). 709837/0888