Global Patent Index - EP 0975692 A1

EP 0975692 A1 2000-02-02 - CONTROLLED DEGRADATION COATINGS AND A METHOD FOR THEIR MANUFACTURE

Title (en)

CONTROLLED DEGRADATION COATINGS AND A METHOD FOR THEIR MANUFACTURE

Title (de)

BESCHICHTUNG ZUM KONTROLLIERTEN ABBAU UND VERFAHREN ZU IHRER HERSTELLUNG

Title (fr)

REVETEMENTS A DEGRADATION REGULEE ET PROCEDE DE FABRICATION DE CES DERNIERS

Publication

EP 0975692 A1 (EN)

Application

EP 98917566 A

Priority

  • IE 9800028 W
  • IE S970278 A

Abstract (en)

[origin: WO9846668A1] A coating for a biodegradable article comprises a hydratable coating or a chemically or physically discontinuous coating. Imperfections in the coating, which may comprise pores in the coating, enable water to penetrate to the underlying surface of the water soluble article. The nature and extent of the imperfections permits the rate of penetration of the coating by water to be controlled. Alternatively, the coating is a hydratable coating which swells and tears on hydration to expose the underlying article to moisture. By these means, the article can be protected from premature dissolution during its normal working life, but will degrade on disposal to waste, when the surface coating will degrade to permit water to reach and dissolve the underlying article. Typically, the body of the article comprises water soluble, biodegradable polyvinyl alcohol or polyvinylalcohol/polyvinylacetate copolymer. Chemical/physical discontinuity may be achieved by over-coating a surface already covered with a physically flawed coating with a hydratable coating.

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

C08J 7/04

IPC 8 full level (invention and additional information)

C08J 7/04 (2006.01)

CPC (invention and additional information)

C08J 7/047 (2013.01); C08J 2329/04 (2013.01)

Citation (search report)

See references of WO 9846668A1

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 9846668 A1 19981022; AU 7074998 A 19981111; CA 2286724 A1 19981022; EP 0975692 A1 20000202; IE S80667 B2 19981118; IE S970278 A2 19981021

INPADOC legal status


2002-01-02 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20010522

2000-12-27 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20001109

2000-02-02 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 19991111

2000-02-02 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

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