Global patent index - EP 0986602 A1

EP 0986602 A1 2000-03-22 - PROCESS FOR PREPARING POROUS POLYOLEFIN PARTICLES

Title (en)

PROCESS FOR PREPARING POROUS POLYOLEFIN PARTICLES

Title (de)

VERFAHREN ZUR HERSTELLUNG VON PORÖSEN POLYOLEFINPARTIKELN

Title (fr)

PROCEDE SERVANT A PREPARER DES PARTICULES POREUSES DE POLYOLEFINES

Publication

EP 0986602 A1 (EN)

Application

EP 98928644 A

Priority

  • NL 9800321 W
  • NL 1006235 A
  • NL 1007333 A

Abstract (en)

[origin: WO9855540A1] The invention relates to a process for preparing porous polyolefin particles. The process according to the invention is characterized in that it comprises the following steps: 1) dissolving at least one crystallizable polyolefin in a solvent, in the absence of a nucleating agent; 2) dispersing the polyolefin solution obtained in a non-solvent in the presence of a surfactant, at a temperature that is higher than the crystallization temperature of the polyolefin in the polyolefin solution; 3) cooling the multi-phase system obtained with stirring, at a rate of between 0.05 and 10 DEG C/min to a temperature that lies below the crystallization temperature of the polymer in the polymer solution, so that firm polyolefin particles are formed; 4) separating the polyolefin particles; 5) drying the polyolefin particles. The invention also relates to a porous polyolefin particle with a high effective loadability and a narrow particle size distribution.

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

C08J 9/28

IPC 8 full level (invention and additional information)

A61K 47/32 (2006.01); C08J 3/14 (2006.01); C08J 9/28 (2006.01)

CPC (invention and additional information)

C08J 9/28 (2013.01); C08J 2201/052 (2013.01); C08J 2201/0542 (2013.01); C08J 2323/02 (2013.01)

Citation (search report)

See references of WO 9855540A1

Designated contracting state (EPC)

BE DE FR GB IT NL

EPO simple patent family

WO 9855540 A1 19981210; AU 8039498 A 19981221; CN 1265690 A 20000906; EP 0986602 A1 20000322; JP 2002503281 A 20020129; KR 20010013416 A 20010226; NL 1007333 C1 19990427

INPADOC legal status

2001-08-22 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20010118

2000-08-23 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20000707

2000-03-22 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 19991129

2000-03-22 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): BE DE FR GB IT NL