Global Patent Index - EP 1098927 A1

EP 1098927 A1 2001-05-16 - PREPARATION OF CORE-SHELL POLYMER PARTICLES CONTAINING VOIDS

Title (en)

PREPARATION OF CORE-SHELL POLYMER PARTICLES CONTAINING VOIDS

Title (de)

HERSTELLUNG VON KERN-SCHALE POLYMERTEILCHEN WELCHE HOHLRÄUME ENTHALTEN

Title (fr)

PREPARATION DE PARTICULES POLYMERES DE NANOENCAPSULATION CONTENANT DES CREUX

Publication

EP 1098927 A1 (EN)

Application

EP 00922681 A

Priority

  • FI 0000371 W
  • FI 991051 A

Abstract (en)

[origin: WO0068304A1] The invention relates to a process for making core-shell polymer particles containing voids which comprises first emulsion polimerization of a core from a core monomer system comprised of at least one unsaturated monomer containing acid functionality optionally in the presence of seed latex, then encapsulating said core with a hard shell by emulsion polymerizing a shell monomer system containing at least a vinyl aromatic or/and unsaturated carboxylic ester in the presence of said core, and finally swelling at elevated temperature the resultant core-shell polymer particles with volatile base, shell monomers, a radical inhibitor and a non-ionic surfactant followed by polymerization of shell monomers charged at swelling stage to produce an aqueous dispersion of particles which, when dried contain a microvoid which causes opacity in compositions. The core-shell particles produced by the process described above are used in opaque and glossy coatings.

IPC 1-7 (main, further and additional classification)

C08J 9/20; C08F 2/22; C08F 265/04

IPC 8 full level (invention and additional information)

C08F 2/22 (2006.01); C08F 285/00 (2006.01)

CPC (invention and additional information)

C08F 285/00 (2013.01)

Combination set (CPC)

  1. C08F 285/00 + C08F 212/08
  2. C08F 285/00 + C08F 220/12

Citation (search report)

See references of WO 0068304A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 0068304 A1 20001116; AU 4299500 A 20001121; EP 1098927 A1 20010516; FI 991051 A0 19990507; FI 991051 A 20001108

INPADOC legal status


2004-05-12 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20031101

2001-05-16 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20010105

2001-05-16 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2001-05-16 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Free text: AL;LT;LV;MK;RO;SI