Global Patent Index - EP 3225327 A1

EP 3225327 A1 2017-10-04 - AN INORGANIC BINDER SYSTEM FOR FOUNDRIES

Title (en)

AN INORGANIC BINDER SYSTEM FOR FOUNDRIES

Title (de)

ANORGANISCHES BINDEMITTELSYSTEM FÜR GIESSEREIEN

Title (fr)

SYSTÈME DE LIANT INORGANIQUE POUR FONDERIES

Publication

EP 3225327 A1 (EN)

Application

EP 17163617 A

Priority

IT UA20162227 A

Abstract (en)

The present invention relates to a powder composition that acts as an activator in foundry binder systems comprising an aqueous solution of sodium silicate. The powder composition of the invention comprises sodium silicate having CAS Registry Number 1344-09-8 and a SiO 2 /Na 2 O molar ratio comprised between 3.0 and 3.6, preferably between 3.2 and 3.5, sodium aluminosilicate having CAS Registry Number 1344-00-9, and, optionally, additives. The invention furthermore claims binder systems comprising the powder composition of the invention and aqueous solutions of sodium silicate, optionally comprising additives, the use of said binder systems for the production of foundry moulds, such as cores and/or moulds, and likewise the moulding material mixtures for the production of foundry cores and/or moulds comprising the binder systems of the invention and silica sand and/or other granular refractory material. Furthermore, objects of the invention are a process for the production of said foundry cores and/or moulds, comprising a production step of the moulding material mixtures comprising the binder systems of the invention, together with silica sand and/or other granular refractory material, and a heating step of said moulding material mixtures, and the cores and/or moulds obtainable with said process.

IPC 8 full level (invention and additional information)

B22C 1/18 (2006.01); B22C 9/00 (2006.01)

CPC (invention and additional information)

B22C 1/188 (2013.01)

Citation (applicant)

  • US 4226277 A 19801007 - MATALON RALPH
  • WO 9849118 A1 19981105 - CROSFIELD JOSEPH & SONS [GB], et al
  • EP 1802409 A2 20070704 - LUENGEN GMBH & CO KG AS [DE]
  • SCHIELE; SCHON: "Anorganische Binder zur Form- und Kernherstellung in der Giesserei", 2012, pages: 70
  • "Giesserei Lexikon", 1986, FACHVERIAG SCHIELE & SCHON GMBH, pages: 1066
  • DONALD W; D. SMITH: "Use of blast furnace slag cements as hardening agents for silicate-bonded moulding sands", January 1968, THE BRITISH FOUNDRYMAN, pages: 34 - 40
  • D. WARREN: "Recent developments in the silicate-based foundry processes", December 1971, THE BRITISH FOUNDRYMAN, pages: 449 - 455

Citation (search report)

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

Designated extension state (EPC)

BA ME

EPO simple patent family

EP 3225327 A1 20171004

INPADOC legal status


2018-01-10 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20171130

2018-01-10 [RBV] DESIGNATED CONTRACTING STATES (CORRECTION)

- Designated State(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

2017-10-04 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

2017-10-04 [AV] REQUEST FOR VALIDATION OF THE EUROPEAN PATENT IN:

- Countries: MA MD

2017-10-04 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Countries: BA ME