Patent · US Active

Composite foils biodisintegratable at home compost conditions

US12421344B2 · kind B2 · utility

0Cited by

6References

12Claims

0Family size

Assignee

BASF SE

Inventors

Karl-Heinz Schumacher · Ludwigshafen, DE
Ulrike Licht · Mannheim, DE
Ines Pietsch · Speyer, DE
Lars Heckhoff · Ludwigshafen am Rhein, DE

Key dates

Filing date	Feb 24, 2021
Grant date	Sep 23, 2025
Priority date	—
Expiry date	Jan 24, 2042

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G2230/00
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

The use of an aqueous polyurethane dispersion adhesive is described for producing composite foils which are biodisintegratable at home compost conditions where at least two substrates are adhesive-bonded to one another with use of the polyurethane dispersion adhesive, where at least one of the substrates is a polymer foil which is biodisintegratable at home compost conditions. At least 60% by weight of the polyurethane is composed of diisocyanates, polyesterdiols, and at least one bifunctional carboxylic acid selected from dihydroxy carboxylic acids and diamino carboxylic acids, wherein the polyurethane has no melting point above 20° C. or wherein the polyurethane has a melting point above 20° C. with an enthalpy of fusion lower than 10 J/g, and wherein a film of the polyurethane adhesive is biodegradable at home compost conditions.

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