Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1998-07-15
1999-12-28
Cain, Edward J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C08F 1400
Patent
active
060083034
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to polymers I, which are suitable as dispersing resins and are obtained by reacting from the group consisting of atoms on the benzene ring, in the presence of a compound IX which contains an N-oxyl radical function, with from the group consisting of polar or acidic group, one polar or acidic group or a group which can readily be converted into an acidic group, alkyl group of 1 to 4 carbon atoms on the ring, and selected from the group consisting of atoms on the benzene ring, in the presence of a compound XXV which contains an N-oxyl radical function,
polymer I containing from 10 to 90% by weight of II and in total from 10 to 90% by weight of X.
The present invention, relates furthermore to the use of such polymers for pigment formulations and pigment-containing coatings, and to pigment formulations comprising a pigment and a polymer I.
Aqueous and organic suspensions which contain a pigment and a binder are widely used for the production of coatings (Ullmann's Encyclopedia of Industrial Chemistry, 5th Edition, Vol. 20, pages 243-369, VCH Publishers Inc., Weinheim-New York, 1992).
In such suspensions, the pigment should as a rule be and remain very finely divided; furthermore, it should be capable of being dispersed rapidly and moreover the suspensions should remain stable. Since these requirements cannot as a rule be met with pure pigments, it is advantageous first to convert the pure pigments into a corresponding suitable form for use, this generally being a pigment formulation with a dispersion resin.
Dispersing resins which are suitable in principle are polymers having polar, acidic or basic groups. In particular, inorganic pigments undergo addition at these anchor groups so that the organophilic moieties of the resin molecules project outward and thus make the pigment particles compatible with the binder in which they are embedded.
Although these dispersing resins can help to stabilize pigment dispersions, the dispersion stability is not sufficient for the particularly advantageous finely divided pigments.
U.S. Pat. No. 5,412,047 describes a polymer which may contain acidic or polar groups and can be prepared by reacting a very wide range of olefinically unsaturated compounds in any order and in any mixture, in the presence of a compound which contains an N-oxyl radical function.
However, such polymers have the disadvantage that they do not have strong affinity either to the usually hydrophilic pigments or to the generally organophilic binders. Thus, both the dispersing action and the anchoring of the pigments in the binder matrix is unsatisfactory, resulting in insufficient mechanical strength, in particular abrasion resistance, and weather resistance, in particular moisture resistance, of the pigment-containing coatings.
It is an object of the present invention to provide dispersing resins with which the disadvantages described can be overcome in a technically simple and economical manner.
We have that this object is achieved by the polymers I defined at the outset, their use for pigment formulations and pigment-coatings, and pigment formulations comprising a pigment and a polymer I.
Suitable esters IV are primarily esters of .alpha.,.beta.-unsaturated carboxylic acids V of the formula ##STR1## where R.sup.1, R.sup.2 and R.sup.3 are each hydrogen or C.sub.1 -C.sub.4 -alkyl, acrylic acid and methacrylic acid being preferred. Mixtures of esters of different such carboxylic acids may also be used.
Suitable alcohol components VI in addition to the C.sub.8 -C.sub.25 -alcohols, such as 2-ethylhexanol, nonanol, stearyl alcohol and lauryl alcohol, are preferably the C.sub.1 -C.sub.7 -alcohols, in particular, methanol, ethanol, n-propanol, isopropanol, n-butanol, sec-butanol, tert-butanol, isobutanol, tert-butane-1-ol and mixtures of such alcohols.
Suitable esters VII are esters of vinyl alcohol and of a saturated carboxylic acid of 1 to 4 carbon atoms, such as formic acid, butyric acid and isopropyl carboxylic acid, in particular acetic acid and propionic acid. Mixtures of ester
REFERENCES:
patent: 3506574 (1970-04-01), Stambaugh et al.
patent: 5412047 (1995-05-01), Georges et al.
Bauer Stephan
Paulus Wolfgang
Weingart Franz
BASF - Aktiengesellschaft
Cain Edward J.
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