US 11,628,652 B2 · Composite polymer films

Abstract

A composite film includes a) a self-supporting layer of a polymer film (such as a polyester), b) an optional primer layer on the polymer film layer, wherein the primer layer includes a PVdX (X being halo), acrylic or vinyl resin; and c) a layer of heat seal composition on the primer layer, wherein the heat seal composition includes a polyolefin plastomer (POP) resin and a tackifier that constitutes at least 20 wt % of the heat seal composition. The composite film may be formed by applying a coating composition including the heat seal composition in a solvent to a primer layer on the polymer film or directly on the polymer film in absence of the optional primer layer, and then evaporating the solvent. The composite film may be heat-sealed to a surface of a container or a self-supporting film.

Claims37

Dependent claims

A composite film comprising:

a) a self-supporting layer of a polymer film,
b) primer layer on the polymer film, and in between the polymer film and a heat seal layer (c), wherein the primer layer comprises a halo polyvinylidene polymer, an acrylic resin and/or a vinyl resin;
and
wherein the heat seal layer comprising a heat seal composition is disposed on the primer layer,
wherein the heat seal layer composition comprises a polyolefin plastomer (POP) resin, a tackifier and ethylene vinyl acetate (EVA);
and where
i. the tackifier is present in an amount of at least 37% by weight of the heat seal composition, the total weight of the heat seal composition being 100%;
and
ii. the POP resin is present in an amount of no more than 80% by weight of the heat seal composition, the total weight of heat seal composition being 100%.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application

16/650,922Filed 26 Sep 2018 · us provisional application

Priority

27 Sep 2017

Published

US 2020/0269552 A127 Aug 2020

Granted

18 Apr 2023

Term ends

Not estimatedThe source records don’t support an estimate.

Classification15 codes

B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
B32B 27/32
Layered products comprising a layer of synthetic resin: comprising polyolefins
B32B 27/36
Layered products comprising a layer of synthetic resin: comprising polyesters
B65B 3/04
Packaging plastic material, semiliquids, liquids or mixed solids and liquids, in individual containers or receptacles, e.g. bags, sacks, boxes,…:…

Composite polymer films

Life of this patent

Composite polymer films

Life of this patent

Abstract

Claims37