Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1998-05-20
2000-10-31
Szekely, Peter A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
156327, 523351, 524272, 524296, 524297, 524314, 524369, 524376, 524377, 524386, 525149, 525163, 525207, 525210, 525211, C08J 322, C08L 9304, C08K 511, C08K 512, C08K 506
Patent
active
061404004
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1) Field of the Invention
The invention relates to redispersible tackifier powders and to adhesives which comprise redispersible tackifier powders in powder form or in the form of their aqueous redispersion.
2) Background Art
Use as adhesives is an important area of application for polymers, for example homopolymers or copolymers of vinyl esters, (meth)acrylic esters or styrene. An example of this is the use of vinyl acetate-ethylene copolymers as flooring adhesives (EP-A 23360, U.S. Pat. No. 4,322,330). EP-A 620243 describes the use of vinyl ester-acrylate copolymers as contact adhesives or flooring adhesives. DE-A-3737630 (U.S. Pat. No. 4,975,481) relates to contact adhesives which are based on ethylene-vinyl acetate copolymers. EP-A 17986 (U.S. Pat. No. 4,322,516) disclosed contact adhesives based on acrylate-vinyl acetate-ethylene copolymers. EP-A 490191 (U.S. Pat. No. 5,196,468) relates to the use of aqueous acrylate latices as flooring adhesives. In the applications mentioned these polymers can in principle be used in the form of their powders or aqueous dispersions.
Especially for use as contact adhesives or flooring adhesives, the addition of tackifying substances, tackifiers, including tackifier resins, is often necessary in order to improve the tackiness. These tackifiers can be added to the aqueous dispersion as a solution in plasticizer (EP-A 23360). DE-A-3737360 discloses the addition of the tackifier to the polymer dispersion as a solution in organic solvent or in the form of its melt. EP-A 490191 describes a procedure in which a melt of tackifier resin and surface-active substances is added to the adhesive dispersion. In EP-A 620243, an aqueous suspension of the tackifier resin is added to the adhesive dispersion.
In the case of the tackifier solutions, a disadvantage of these procedures is the release of the volatile solvent during or after processing. Adding tackifier resins in the form of the melt is a time-consuming and energy-intensive process step which makes the production of the adhesive more expensive. When aqueous tackifier dispersions are added, there is a normally unwanted dilution of the adhesive dispersion. Moreover, it is not possible without taking additional steps to mix aqueous tackifier dispersions homogeneously with adhesive powder.
The object was therefore to provide a tackifier composition which can be used to modify both pulverulent and aqueous adhesives without the abovementioned disadvantages occurring.
SUMMARY OF THE INVENTION
The object has been achieved by water-redispersible, pulverulent tackifier compositions which can be employed simply both in pulverulent adhesives and in aqueous adhesive dispersions.
The invention provides water-redispersible tackifier powder compositions comprising substances, of one or more compounds from the group consisting of water-soluble, low molecular mass homopolymers or copolymers of olefinically unsaturated mono- or dicarboxylic acids or their anhydrides, which as copolymers also contain from 2 to 50 mol % of further free-radically polymerizable monomers, and of phenolsulphonic, melaminesulphonic and naphthalenesulphonic acid condensates, the water solubility of the abovementioned compounds being at least 10 g in 100 g of water at 23.degree. C. and their molecular weight being .ltoreq.250,000 g/mol, determined as weight average, constituents, of antiblocking agents, and of other additives.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Suitable tackifying substances are those customarily employed as tackifiers, examples being the rosins, also known as balsam resins or tall resins, and derivatives thereof, such as dimerized, disproportionated and hydrogenated rosin. Further examples are the glycol esters, glycerol esters and pentaerythritol esters of the balsam resins, such as rosin diethylene glycol ester, hydrocarbon resins, polyterpene resins, coumarone-indene resins and terpene-phenol resins.
Also suitable are liquids such as diethylene glycol mono-butylether acetate, diethylene glycol mono-butyl eth
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Derwent Abstract corresponding to EP-620243 (#94-318338).
Derwent Abstract corresponding to DE-3737360 (#88-134228).
Figge Reiner
Weissgerber Rudolf
Szekely Peter A.
Wacker-Chemie GmbH
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