Patent · US Expired

Polyurethane based thermoreactive hot-melt adhesives

US6503981B2 · kind B2 · utility

2Cited by

4References

9Claims

0Family size

Assignee

E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

Silke Hellwig · Wuppertal, DE
Olaf Kleineberg · Wuppertal, DE
Heinz-Peter Pfeiffer · Wuppertal, DE

Key dates

Filing date	Dec 22, 2000
Grant date	Jan 7, 2003
Priority date	—
Expiry date	Dec 22, 2020

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G18/12
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A thermally curable hot-melt adhesive composition, comprises(A) a prepolymer having isocyanate groups, a number average molecular mass Mn of 700 to 6000 and wherein 50 to 100%, preferably 70-95%, of the reactive isocyanate groups of the prepolymer are blocked, the prepolymer being the reaction product of one or more at least semi-crystalline straight-chain polyesters; one or more amorphous or liquid straight-chain polyesters, optionally one or more polyethers, and one or more diisocyanates; and(B) at least one reactive component selected from the group consisting of diamines, epoxide adducts of diamines, and polyalcohols.

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