Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1989-12-15
1992-06-09
Seccuro, Carman J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525118, 525119, 525208, 525281, 525913, 524531, 524530, C08L 3306, C08L 3314, C08F26504, C08F26506
Patent
active
051207958
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to nonaqueous plastics formulations, essentially containing consists of of a methacrylate of a C.sub.2 -C.sub.8 -alkanol or of a mixture of these monomers (monomers II), unsaturated mono- and/or dicarboxylic acid of 3 to 5 carbon atoms (monomers III), least one nitrogen base group and/or one hydroxyl group (monomers IV) and in polymerized form, (monomers VI), -C.sub.8 -alkanol or of a mixture of these monomers (monomers VII) and VIII), in polymerized form,
The present invention furthermore relates to the use of these formulations as adhesive, sealing and coating materials.
DE-B 24 54 235 discloses nonaqueous plastics formulations which contain, as base polymers, finely divided homopolymers of methyl methacrylate or copolymers of this monomer with C.sub.1 -C.sub.10 -alkyl acrylates and/or C.sub.2 -C.sub.10 -alkyl methacrylates and, as an organic liquid, phthalates, phosphoric esters, glycolates, high-boiling alkylaryl hydrocarbons or ether compounds. These plastics formulations have the properties of plastisols, ie. they behave like a pasty, relatively easily brushable dispersion in the cold state but gel to form a viscous rubber-like material when heated. Because of this property, the plastisols are used as adhesive, sealing and coating materials. DE-B 24 54 235 and DE-B 25 29 732 furthermore disclose that the adhesive power of these plastics materials can be improved by copolymerizing in the base polymers minor amounts of monomers having free carboxyl, hydroxyl, epoxide, amino or heterocyclic groups containing at least one N atom in the ring, and/or by adding suitable adhesion promoters to these plastics materials, but the adhesive power of these plastics materials are also not completely satisfactory in the solidified state on metallic substrates.
It is an object of the present invention to overcome this disadvantage by means of more suitable nonaqueous plastics formulations.
We have found that this object is achieved by the plastics formulations described at the outset, which are in the form of plastisols.
Suitable finely divided plastics A) are both homopolymers and copolymers of methyl methacrylate. Preferably used copolymers are those which are composed of from 50 to 90% by weight of methyl methacrylate. Particularly suitable comonomers are the monomers II, the esters of acrylic or methacrylic acid which are derived from the alkanols ethanol, isopropanol, n-butanol, isobutanol, n-hexanol and 2-ethylhexanol and, in the case of acrylic acid, from methanol being preferably copolymerized. Particularly preferred monomers II are methyl acrylate, ethyl acrylate and 2-ethylhexyl acrylate.
Component A) advantageously also contains, as copolymerized units, the monomers III and IV which carry free functional groups. Preferred monomers III are acrylic, methacrylic and itaconic acid, of which methacrylic acid is particularly preferred. Advantageously incorporated monomers IV are the nitriles and the amides of acrylic and methacrylic acid and the esters of these acids with lower aliphatic hydroxy- or aminoalcohols, such as hydroxyethyl acrylate, hydroxyethyl methacrylate and N,N-dimethylaminoethyl acrylate. Other suitable monomers IV are vinyl compounds which contain a heterocyclic group having at least one basic nitrogen atom in the ring, such as N- or C-vinyl compounds of imidazole, N-vinylimidazole being particularly preferred.
In addition, component A) may contain minor amounts, ie. up to 5% by weight, of other copolymerizable monomers, such as vinyl esters of C.sub. -C.sub.4 -alkanoic acids.
The finely divided polymers A) are preferably prepared by free radical polymerization, suspension and emulsion polymerization being preferred to solution, mass and precipitation polymerization. An aqueous plastics dispersion whose solids content is usually from 30 to 60% by weight is prepared in a particularly advantageous manner by polymerization of the relevant monomers in an aqueous medium under the known conditions of emulsion polymerization in the presence of water-soluble free radical i
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Anders Hermann
Aydin Oral
Filges Ulrich
BASF - Aktiengesellschaft
Seccuro Carman J.
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