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Fine aqueous dispersion of an organophilic sheet silicate
| Details |
Inventors: Horn, Ute; Dessauer, Guido;
Assignee: Hoechst Aktiengesellschaft (Frankfurt, DE)
Primary Examiner: Brunsman; David
Assistant Examiner:
Attorney, Agent or Firm: Connolly & Hutz
The present invention relates to a fine aqueous dispersion of an organophilic sheet silicate, consisting essentially of a sheet silicate capable of cation exchange and a quaternary organic onium salt reacted therewith, which dispersion comprises from 3 to 30% by weight, based on the organophilic sheet silicate, of a water-soluble, natural polymer and/or a derivative thereof. |
|
DETAILED DESCRIPTION We claim: 1.
A fine aqueous dispersion consisting essentially of a sheet silicate capable of ion exchange combined with a quanternary organic onium salt to form an organophilic sheet silicate and from 3 to 30% by weight, based on the organphilic sheet silicate, as anhydrous organphilic sheet silicate, of a water-soluble natural polymer and/or a salt, ether or ester thereof.
2.
A fine aqueous dispersion as claimed in claim 1, wherein the sheet silicate capable of cation exchange comprises montmorillonite, hectorite, saponite, sauconite, beidellite, nontronite and/or bentonite.
3.
A fine aqueous dispersion as claimed in claim 1, wherein the quaternary organic onium salt comprises a compound of the formula (NR.
sup.
1 R.
sup.
2 R.
sup.
3 R.
sup.
4).
sup.
+ A.
sup.
-, in which R.
sup.
1 and R.
sup.
2 are C.
sub.
8 -C.
sub.
22 -alkyl, C.
sub.
8 -C.
sub.
22 -alkenyl or benzyl, R.
sup.
3 and R.
sup.
4 are C.
sub.
1 -C.
sub.
4 -alkyl or C.
sub.
1 -C.
sub.
4 -hydroxyalkyl and A.
sup.
- is an anion.
4.
A fine aqueous dispersion as claimed in claim 1, wherein the water-soluble, natural polymer and/or the salt, ether or ester thereof is a cellulose ether, a starch ether, a guar gum salt, ether or ester, a xanthan gum salt, ether or ester and/or an alginate.
5.
A fine aqueous dispersion as claimed in claim 4, wherein the salt, ether or ester of the water-soluble, natural polymer comprises a water-soluble cellulose ether possessing a mean molecular weight between 5,000 and 500,000 and a viscosity between 10 and 500,000 mPa.
s, measured as a 2% strength aqueous solution in distilled water using a Hoppler falling sphere viscometer at 20.
degree.
C.
6.
A fine aqueous dispersion as claimed in claim 5, wherein said viscosity, measured in the same manner, is between 20 and 150,000 mPa.
s.
7.
A fine aqueous dispersion as claimed in claim 1, which comprises from 12 to 17% by weight of a water-soluble, natural polymer and/or a salt, ether or ester thereof, based on the total weight of the anhydrous organophilic sheet silicate.
8
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