Patent · US Active

Polyurethane prepregs with controllable tack

US10428193B2 · kind B2 · utility

0Cited by

4References

16Claims

0Family size

Assignee

EVONIK DEGUSSA GMBH · DE

Inventors

Uwe Stapperfenne · Uerdingen, DE
Marina-Elena Schmidt · Gelsenkirchen, DE
Tobias Gutmann · Dorsten, DE
Christina Cron · Velbert, DE
Sandra Reemers · Munster, DE

Key dates

Filing date	Oct 28, 2016
Grant date	Oct 1, 2019
Priority date	—
Expiry date	Mar 3, 2037

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2463/00
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

The invention relates to a process for producing a prepreg based on polyurethane, which is notable for high storage stability at room temperature, a two-stage reaction mechanism, and adjustable adhesion on metal surfaces. It is based on the problem of making the surface tack of the prepregs controllable during processing. The solution is to assemble the PU mixture from which the matrix originates at a later stage such that the glass transition temperature of the thermoplastic polymer is above 30° C. For this purpose, the invention proposes two basically independent but certainly synergistic measures, namely:

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