Patent · US Expired

Flexible multilayer film

US6524712B1 · kind B1 · utility

13Cited by

3References

10Claims

0Family size

Assignee

Wolff Walsrode AG · DE

Inventors

Ralf Schledjewski · Walsrode, DE
Antoine Cassel · Walsrode, DE
Rainer Brandt · Walsrode, DE
Aileen Craig · Bad Fallingbostel, DE

Key dates

Filing date	Apr 4, 2001
Grant date	Feb 25, 2003
Priority date	—
Expiry date	Apr 4, 2021

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31565
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A multilayer film is described which has at least one first layer (1) of thermoplastic polyurethane, at least one second layer (2) of thermoplastic elastomer, and optionally a third layer (3) of thermoplastic polyurethane. The ratio of the water vapor permeability level of the first layer (1) to the water vapor permeability level of the second layer (2), of the multilayer film is at least two. When the optional third layer (3) is present in the multilayer film, the first and third layers enclose the second layer. Also described are filled articles (e.g., water beds and hot/cold pads), which are fabricated from the multilayer films of the present invention.

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