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US 5,462,978 AGranted
Use of unsaturated sulfonic acid polymers as spray drying assistants
AssigneeBASF SE
InventorsErich Penzel, Gernot Franzmann, Maximilian Angel, Joachim Pakusch, Bernhard Schuler
Life of this patent
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Abstract
Polymers I comprising from 15 to 80% by weight of monomers of the general formula I ##STR1## where R.sup.1, R.sup.2 and R.sup.3 are each C.sub.1 -C.sub.3 -alkyl, R.sup.4 is C.sub.1 -C.sub.5 -alkyl and X is O or NH, and from 20 to 85% by weight of other monomers capable of undergoing free radical copolymerization are used as assistants in the spray drying of aqueous dispersions of polymers II which differ from the polymers I.
Claims13
A process for spray drying aqueous polymer dispersions, comprising:
- preparing a mixed polymer dispersion of at least one polymer II and at least one polymer I as a spray assistant, wherein polymer I is comprised of (a) from 15-80% by weight of at least one monomer of formula I or salts thereof:
- ##STR4## wherein R.sup.1, R.sup.2 and R.sup.3 independently of one another are each hydrogen or C.sub.1-3 alkyl, R.sup.4 is C.sub.1-5 alkylene and X is O or NH, and (b) from 20-85% by weight of at least one monomer capable of undergoing free radical copolymerization, with the proviso that the average molar solubility of the components of the mixture of all the monomers (b) polymerized at 25.degree. C. in water is lower than the correspondingly defined average molar solubility of the components of the mixture of all the monomers (a) polymerized;
- and
- spray drying the mixed polymer dispersion.
1 more element
Dependencies are inferred from the claim text.