Polymeric materials and their use

• US 6,127,499 A
• Filed: 06/30/1998
• Issued: 10/03/2000
• Est. Priority Date: 06/30/1997
• Status: Expired due to Fees

• Current Assignee: CIBA Specialty Chemicals Water Treatments Limited (BASF SE)
• Original Assignee: CIBA Specialty Chemicals Water Treatments Limited (BASF SE)
• Inventors: Symes, Kenneth Charles, Mistry, Kishor Kumar
• Primary Examiner(s): YOON, TAE H
• Application Number:
  US09/107,407
• Time in Patent Office: 826 Days
• Field of Search: 526/271, 526/273, 526/366, 526/272
• US Class Current: 526/271
• CPC Class Codes: B01J 13/16 Interfacial polymerisation
• CPC Class Codes: B01J 13/20 After-treatment of capsule walls, e.g. hardening
• CPC Class Codes: C09K 23/00 Use of substances as emulsifying, wetting, dispersing, or foam-producing agents
• CPC Class Codes: C09K 23/34 Higher-molecular-weight carboxylic acid esters esters of higher fatty acids with hydroxyalkylated sulfonic acids or salts thereof C09K23/06
• CPC Class Codes: C11D 17/0013 Liquid compositions with insoluble particles in suspension C11D17/0021, C11D17/0026, C11D17/003 take precedence
• CPC Class Codes: C11D 17/0039 Coated compositions or coated components in the compositions, (micro)capsules
• CPC Class Codes: C11D 3/37 Polymers polymeric surface-active agents C11D1/008; polysaccharides C11D3/222
• CPC Class Codes: C11D 3/3757 (Co)polymerised carboxylic acids, -anhydrides, -esters in solid and liquid compositions
• CPC Class Codes: C11D 3/3765 in liquid compositions

Abstract

A polymeric amphipathic stabilizer is formed of hydrophobic monomer units and hydrophilic monomer units which comprise carboxylic free acid or acid salt units and glycidyl or anhydride units. The glycidyl or anhydride units react onto reactive groups on polymer particles when dispersed in non-aqueous liquid and provide improved stability when the particles are subsequently dispersed in liquid electrolyte.

Claims

1. A polymeric amphipathic stabilizer comprising an addition polymer of hydrophobic monomer units wherein the hydrophobic monomer units comprise at least 20% by weight C_8-24 alkyl (meth) acrylate units and at least 10% by weight C_1-4 (meth) acrylate and/or styrene units and hydrophilic monomer units wherein the hydrophilic monomer units comprise 5 to 30% by weight carboxylic free acid or acid salt monomer units and 0 to 20% by weight hydroxyalkyl monomer units and reactive monomer units selected from (a) glycidyl monomer units and (b) anhydride monomer units wherein the amount of the reactive monomer units is less than 10% by weight total monomer units.

2. A stabiliser according to claim 1 in which the amount of the reactive monomer units is 1 to 5% by weight.

3. A stabiliser according to claim 1 in which the reactive monomer units are selected from glycidyl acrylate and glycidyl methacrylate.

4. A stabiliser according to claim 1 in which the reactive monomer units are maleic anhydride.

5. A stabiliser according to claim 1 containing at least 10% by weight of the carboxylic free acid monomer units.

6. A stabiliser according to claim 1 comprising 25 to 70% by weight C_8-24 alkyl methacrylate, 15 to 40% methyl methacrylate and/or styrene, 5 to 30% methacrylic acid and/or maleic acid, 0 to 20% hydroxyalkyl (meth) acrylate and 1 to 5% maleic anhydride and/or glycidyl (meth) acrylate.