Coated scrim reinforced thermoplastic olefin roofing membrane

Patent metadata

Field	Value
Publication number	US-2016265156-A1
Application number	US-201615001556-A
Country	US
Kind code	A1
Filing date	Jan 20, 2016
Priority date	Mar 11, 2015
Publication date	Sep 15, 2016
Grant date	—

Abstract

A scrim reinforced roofing membrane comprising a coated scrim layer having a first side and a second side and a first TPO layer on the first side of the coated scrim layer. The coated scrim layer contains a scrim fabric which contains a plurality of warp yarns in a first direction and a plurality of weft yarns in a second direction approximately perpendicular to the first direction. The warp yarns cross the weft yarns at crossing points. The scrim fabric has a polyvinyl acetate coating which is located along the length of the warp yarns and the weft yarns and between the warp and weft yarns at the crossing points. The coated scrim is at least partially embedded in the first TPO layer.

First claim

1 . A scrim reinforced roofing membrane comprising:
a coated scrim layer having a first side and a second side, wherein the coated scrim layer comprises:
a scrim fabric, wherein the scrim fabric is a weft insert warp knit fabric and comprises a plurality of warp yarns in a first direction and a plurality of weft yarns in a second direction approximately perpendicular to the first direction, wherein the warp yarns cross the weft yarns at crossing points; and,
a coating comprising polyvinyl acetate and a fluorocarbon, wherein the coating is located along the length of the warp yarns and the weft yarns and is located between the warp and weft yarns at the crossing points;
a first thermoplastic olefin layer on the first side of the coated scrim layer, and;
a second thermoplastic olefin layer on the second side of the coated scrim layer, wherein the coated scrim layer is fully embedded and encapsulated by the first thermoplastic olefin layer and the second thermoplastic olefin layer.

2 . The scrim reinforced roofing membrane of claim 1 , wherein the warp yarns and weft yarns of the scrim fabric comprise polyester yarns.

3 . The process of forming a scrim reinforced roofing membrane comprising, in order:
forming a weft insert warp knit fabric scrim fabric, wherein the scrim fabric comprises a plurality of warp yarns in a first direction and a plurality of weft yarns in a second direction approximately perpendicular to the first direction, wherein the warp yarns cross the weft yarns at crossing points; coating the scrim fabric with a coating comprising polyvinyl acetate, wherein the coating is located along the length of the warp yarns and the weft yarns and is located between the warp and weft yarns at the crossing points forming a coated scrim fabric; applying a first thermoplastic olefin layer on the first side of the coated scrim layer; and, applying a second thermoplastic olefin layer on the second side of the coated scrim layer, wherein the coated scrim layer is fully embedded and encapsulated by the first thermoplastic olefin layer and the second thermoplastic olefin layer.

4 . The process of claim 3 , wherein the warp yarns and weft yarns of the scrim fabric comprise polyester yarns.

5 . The process of claim 3 , wherein the coating further comprises a fluorocarbon.

Assignees

• Milliken & Co

Inventors

• Martin David W

Classifications

• D10B2331/04

  polyesters, e.g. polyethylene terephthalate [PET] · CPC title

• D10B2401/063

  high strength · CPC title

• D06N5/00 Primary

  Roofing materials comprising a fibrous web coated with bitumen or another polymer, e.g. pitch (compositions of bituminous materials C08L95/00, roof covering E04D5/00, roofing underlays E04D12/002) · CPC title

• D10B2505/18

  Outdoor fabrics, e.g. tents, tarpaulins (D10B2507/00 takes precedence) · CPC title

• D10B2403/0122

  Smooth surfaces, e.g. laminated or coated · CPC title