Particulate polymers, their production and uses

• US 4,950,725 A
• Filed: 05/19/1989
• Issued: 08/21/1990
• Est. Priority Date: 05/20/1988
• Status: Expired due to Term

• Current Assignee: Huntsman International LLC (Huntsman Corporation)
• Original Assignee: Allied Colloids Limited (BASF SE)
• Inventors: Allen, Adrian, Farrar, David, Flesher, Peter
• Primary Examiner(s): Schofer, Joseph L.
• Assistant Examiner(s): DELMENDO, ROMULO H
• Application Number:
  US07/354,889
• Time in Patent Office: 459 Days
• Field of Search: 526/317.1, 526/307.6, 526/287, 523/336, 523/337
• US Class Current: 526/307.6
• CPC Class Codes: C08F 246/00 Copolymers in which the nature of only the monomers in minority is defined
• CPC Class Codes: D06P 1/44 using insoluble pigments or auxiliary substances, e.g. binders
• CPC Class Codes: D06P 1/525 Polymers of unsaturated carboxylic acids or functional derivatives thereof

Abstract

Polymer thickeners suitable for use as textile pigment print paste thickeners are particulate cross linked polymers having a particle size of below 20 μm and have defined physical characterization that indicates an optimum degree of cross linking and molecular size within the polymer.

Claims

1. A particulate cross linked polymeric material formed from a water soluble ethylenically unsaturated monomer or blend of monomers comprising 10 to 100% ionic monomer and 0 to 90% non-ionic monomer and 0.005 to 3% (based on monomer) crosslinking agent and which has a dry particle size of below 20 μ

m, the polymeric material having a storage modulus G'"'"' of 600 to 1400 dynes/cm², a loss modulus G" of 500 to 700 dynes/cm² and a viscosity retention of at least 80%.

2. A polymer according to claim 1 having a flushing value below 6 mm and a transfer value of 70 to 115 g/m².

3. A polymer according to claim 1 having a storage modulus G'"'"' of 950 to 1350, dynes/cm².

4. A polymer according to claim 1 having a storage modulus G'"'"' of at least 750 dynes/cm² and at least 0.5% sodium sulphate for 50% drop in viscosity.

5. A polymer according to claim 2 having a storage modulus G'"'"' of at least 750 dynes/cm² and having flushing value of below 3 mm.

6. A polymer according to claim 2 having a transfer value of at least 90 g/m² and flushing of below 3 mm.

7. A polymer according to claim 1 in which the cross linker comprises an allylic cross linker.

8. A polymer according to claim 7 in which the cross linker comprises a triallyl amine quaternary ammonium salt.

9. A polymer according to claim 1 that has been made by a process in which cross linker is added both at the beginning of the process and at or near the end of the process.

10. A polymer according to claim 1 that has been made by polymerising under conditions which, in the absence of the cross linker, would give intrinsic viscosity of from 3 to 6 dl/g.

11. A polymer according to claim 1 that has been made by a polymerisation process in which initiator is added at the rate of 5 to 20 ppm per minute substantially throughout the process.

12. A polymer according to claim 1 that has been made by polymerisation in the presence of chain transfer agent.

13. A polymer according to claim 1 that has been made by reverse phase polymerisation, and in which the particles are below 4 μ

m in size and are present as a stable dispersion in a non-aqueous liquid.

14. A polymer according to claim 1 formed from monomers comprising 10 to 100% by weight acrylic acid (as free acid or water soluble salt) and 0 to 90% by weight acrylamide.