Patent · US Active

Use of closed-pore microspheres of expanded pearlite as a filler for the production of mouldings for the foundry industry

US11717879B2 · kind B2 · utility

0Cited by

5References

10Claims

0Family size

Assignee

HÜTTENES-ALBERTUS CHEMISCHE WERKE GESELLSCHAFT MIT BESCHRÄNKTER HAFTUNG · DE

Inventors

Sandra LEHMANN · Potsdam, DE
Klaus RIEMANN · Wunstorf, DE
Nils ZIMMER · Garbsen, DE
Hermann LIEBER · Langenhagen, DE
Jürgen HÜBERT · Langenhagen, DE

Key dates

Filing date	Apr 10, 2017
Grant date	Aug 8, 2023
Priority date	—
Expiry date	Oct 23, 2038

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC04B2235/3427
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

The present invention relates to the use of closed-pore microspheres of expanded perlite as a filler for producing moldings for the foundry industry, to a composition for producing moldings for the foundry industry, comprising closed-pore microspheres of expanded perlite as a filler, and a binder, the binder being selected from the group consisting of water glass, phenol-formaldehyde resins, two-component systems comprising as reactants a polyisocyanate and a polyol component containing free hydroxyl groups (OH groups), and starch, and also to moldings for the foundry industry and to a process for producing a molding for the foundry industry.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.