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(11) |
EP 2 174 992 A8 |
| (12) |
CORRECTED EUROPEAN PATENT APPLICATION |
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Note: Bibliography reflects the latest situation |
| (15) |
Correction information: |
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Corrected version no 1 (W1 A1) |
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Corrigendum issued on: |
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30.06.2010 Bulletin 2010/26 |
| (43) |
Date of publication: |
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14.04.2010 Bulletin 2010/15 |
| (22) |
Date of filing: 25.03.2008 |
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| (51) |
International Patent Classification (IPC):
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| (84) |
Designated Contracting States: |
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DE FR GB |
| (30) |
Priority: |
21.03.2007 US 919209 P
11.10.2007 US 974071
26.12.2007 US 9153 P
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| (62) |
Application number of the earlier application in accordance with Art. 76 EPC: |
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08153210.3 / 1972664 |
| (71) |
Applicant: Rohm and Haas Company |
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Philadelphia,
Pennsylvania 19106-2399 (US) |
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| (72) |
Inventors: |
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- Bobsein, Barrett R.
Sellersville, PA (US)
- Harris, Jerome Michael
Penllyn, PA 19422 (US)
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| (74) |
Representative: Buckley, Guy Julian |
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Patent Outsourcing Limited
1 King Street
Bakewell
Derbyshire DE45 1DZ
Bakewell
Derbyshire DE45 1DZ (GB) |
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Remarks: |
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This application was filed on 29-01-2010 as a divisional application to the application
mentioned under INID code 62. |
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| (54) |
Thickener blend composition and method for thickening aqueous systems |
(57) A thickener blend composition, and method for thickening aqueous systems, comprising
an associative thickener wherein the same group that is attached to or within the
backbone of the associative thickener is reversibly switched between being hydrophilic
and hydrophobic in nature. When the group that is attached to or within the backbone
is rendered hydrophilic, the aqueous thickener is pourable and readily incorporated
into aqueous polymer compositions. When this group is rendered hydrophobic, the thickener
performs its thickening function efficiently. Switching is readily accomplished by
adjusting the pH of the associative thickener composition and the aqueous polymer
composition being thickened.