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Title:
EMULSION POLYMERISATION OF ETHYLENICALLY-UNSATURATED MONOMERS IN THE PRESENCE OF PHOSPHORYLATED CELLULOSE
Document Type and Number:
WIPO Patent Application WO/2000/047633
Kind Code:
A2
Abstract:
Proposed is a process for the emulsion polymerisation of ethylenically-unsaturated monomers such as vinyl esters, monovinyl aromatic compounds, (meth)acrylic acid and/or derivatives thereof in the presence of a stabilising amount of water-soluble phosphorylated cellulose obtained by dissolving cellulose in a phosphoric acid-containing solvent to give a solution of which 94-100 wt. % is composed of the constituents cellulose, phosphoric acid and/or its anhydrides, and water. The relative viscosity, $g(h)¿rel?, of the phosphorylated cellulose is preferably < 2.5 (measured at 25 °C in a concentration of 0.3g phosphorylated cellulose/100ml cueen), while the content of cellulose-bound phosphorus is in the range of 3 to 20, preferably 4 to 8 wt. %. In the obtained latex dispersions a biodegradable polymer (cellulose phosphate) is coupled to a non-biodegradable polymer of vinyl esters, styrene, acrylates and/or methacrylates. These dispersions have a very high salt solutions stability and a high storage stability and because of their good adhesive power they are pre-eminently suited to be used for the preparation of latex paints. What is special about this system is that a biodegradable polymer (cellulose phosphate) is coupled to a non-biodegradable polymer of ethylenically-unsaturated monomers such as vinyl esters, monovinyl aromatic compounds (meth)acrylic acid and/or derivatives thereof.

Inventors:
Van Streun, Karel Hindrik (Aduardstraat 32, CT Arnhem, NL-6835, NL)
Application Number:
PCT/EP2000/001050
Publication Date:
August 17, 2000
Filing Date:
February 09, 2000
Export Citation:
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Assignee:
AKZO NOBEL N.V. (Velperweg 76, BM Arnhem, NL-6824, NL)
Van Streun, Karel Hindrik (Aduardstraat 32, CT Arnhem, NL-6835, NL)
International Classes:
C08F2/26; C08F251/02; (IPC1-7): C08F2/26
Domestic Patent References:
WO1996014357A11996-05-17
Foreign References:
EP0469372A11992-02-05
Attorney, Agent or Firm:
Schalkwijk, Pieter Cornelis (Akzo Nobel N.V, Patent Department P.O. Box 9300, SB Arnhem, NL-6800, NL)
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Claims:
Claims
1. A process for the emulsion polymerisation of ethylenicallyunsaturated monomers in the presence of a stabilising amount of a watersoluble cellulose derivative, characterised in that the cellulose derivative is a watersoluble phosphorylated cellulose obtained by dissolving cellulose in a phosphoric acidcontaining solvent to give a solution of which 94100 wt. % is composed of the constituents cellulose, phosphoric acid and/or its anhydrides, and water.
2. A process according to claim 1, characterised in that the ethylenically unsaturated monomers are selected from the group of vinyl esters, monovinyl aromatic compounds, (meth) acrylic acid and/or derivatives thereof.
3. A process according to claim 1, characterised in that the relative <BR> <BR> viscosity, r) re), of the phosphorylated cellulose is < 2.5 (measured at 25°C<BR> <BR> in a concentration of 0.3 g phosphorylated cellulose/100 ml cueen) and the content of cellulosebound phosphorus is in the range of 3 to 20 wt. %.
4. A process according to claim 3, characterised in that the relative viscosity, rire ouf the phosphorylated cellulose is < 2.0 and the content of cellulosebound phosphorus is in the range of 4 to 8 wt. %.
5. A process according to one or more of the preceding claims, characterised in that the amount of phosphorylated cellulose corresponds to a percentage by weight in the range of 0.05 to 5, calculated on the overall amount of monomers.
6. A process according to one or more of claims 14, characterised in that the amount of phosphorylated cellulose corresponds to a percentage by weight in the range of 0.1 to 3, calculated on the overall amount of monomers.
7. A process according to one or more of the preceding claims, characterised in that the polymerisation takes place in the presence of sodium, potassium and/or ammonium persulphate as radical initiator.
8. A process according to one or more of the preceding claims, characterised in that in addition to the watersoluble phosphorylated cellulose another amount of watersoluble cellulose derivative with a molecular weight < 75 000 is present, which is selected from the group of carboxymethyl cellulose and derivatives thereof with a degree of substitution of at least 0.7, hydroxyethyl cellulose, ethyl hydroxyethyl cellulose, methyl cellulose, methyl hydroxypropyl cellulose, hydroxypropyl cellulose, polyacrylic acid and the alkali salts thereof, ethoxylated starch derivatives, watersoluble starch, gelatin, water soluble alginates, casein, agar, wholly and partially hydrolyse polyvinyl alcool, polyacrylamide, (vinyl pyrrolidone), and poly (methyl vinylether maleic anhydride).
9. A process according to claim 8, characterised in that the amount of watersoluble phosphorylated cellulose is at least 10% of the overall amount of watersoluble cellulose.
10. A process according to one or more of the preceding claims, characterised in that in addition 0.01 to about 4 wt. % of a surfaceactive compound, calculated on the overall amount of monomer, is present.
11. A latex obtained using a process according to one or more of the preceding claims, characterised in that the obtained polymer comprises particles with a mean particle size of 50 to 500 nm.
Description:
INTERNATIONAL SEARCH REPORT Internajpnal AppilcatlonNo information on patent family members PCT/EP00/01050 PatentdocumentPublication Patentfamily Publication citedinsearchreportdate member(s)date EP 469372A05-02-1992DE 4024371 A 06-02-1992 AT 121105 T 15-04-1995 DE 59105150 D 18-05-1995 DK 469372 T 08-05-1995 ES 2071173 T 16-06-1995 JP 1994743 C 22-11-1995 JP 4233925 A 21-08-1992 JP 7025851 B 22-03-1995 US 5142008 A 25-08-1992 WO9614357A17-05-1996AU 705681 B 27-05-1999 AU 3998595 A 31-05-1996 BR 9509581 A 23-12-1997 CA 2204242 A 17-05-1996 CZ 9701338 A 15-10-1997 EP 0789725 A 20-08-1997 HU 77335 A 30-03-1998 JP 10508632 T 25-08-1998 NO 972015 A 23-06-1997 NZ 296243 A 29-04-1999 PL 319938 A 01-09-1997 US 5795928 A 18-08-1998US 5795928 A 18-08-1998