Single-layered hot-melt film adhesive which can be wound on a reel without using release or separating agents runs easily on machines and is made from olefin copolymers

US5593775A · kind A · utility

Assignee

• Wolff Walsrode AG · DE

Inventors

• Nicole Hargarter · Charlottesville, US
• Dirk Schultze · Bad Fallingbostel, DE
• Ulrich Reiners · Neuenkirchen, DE

Key dates

• Filing date: Oct 6, 1995
• Grant date: Jan 14, 1997
• Expiry date: Oct 6, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31913
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A single-layered, plastic and elastic thermoplastic hot-melt adhesive film which does not have a separating layer, wherein it can be wound on and off a reel without the use of a supplementary separating material, is essentially free of antiblocking agents and/or lubricants and that the maximum of its thermoanalytically determined main melting peak is below 90.degree. C. and which is essentially formed from at least two olefin copolymers with polar comonomers A and B, wherein ethylene is preferably used as an olefinic monomer, and whose essential comonomers contain oxygen atoms and the essential oxygen-containing comonomers in the olefin copolymers A and B are not identical, wherein the total proportion of oxygen-containing comonomer in the total weight of polymer resin forming the film is between 18 wt. % and 40 wt. % and the proportion of oxygen-containing comonomers in copolymer A is at least 60 wt. % of the total weight of oxygen-containing comonomers and copolymers A and B are mutually degraded under a sufficient shearing force for copolymer B to be present as a finely distributed second phase in copolymer A.