US 10,766,226 B2 · Pet release liner

Abstract

A multilayer release liner for use in a roofing system. that includes a roofing membrane and an asphalt or bitumen adhesive. The multilayer release liner contains a core layer including PET, surrounded by several outer layers including at least two tie layers adhered to the core layer, and at least two polyolefin layers adhered to the tie layers. The multilayer release liner of the present invention is highly compatible with silicone and does not contain any ingredients that may interfere with the adhesion or cure of a silicone coating. The liner of the present invention also provides an effective oil barrier and minimizes oil migration and discoloration of the multilayer release liner from the adhesives used in roofing systems.

Claims15

Dependent claims

A multilayer release liner for a roofing material, comprising:

a core layer comprising polyethylene terephthalate (PET) having a first side and a second side;
a first tie layer disposed upon the first side of the core layer and a second tie layer disposed upon the second side of the core layer;
a first polyolefin layer disposed on the first tie layer and a second polyolefin layer disposed on the second tie layer;
and
a third polyolefin layer disposed on top of the first polyolefin layer and a fourth polyolefin layer disposed on top of the second polyolefin layer;
wherein the PET is present in the core layer in an amount of at least 50 wt % based on the total weight of the core layer.

3 more elements

Dependencies are inferred from the claim text.

Pet release liner

Life of this patent

Pet release liner

Life of this patent

Abstract

Claims15