Polypropylene laminate sheet

Patent metadata

Field	Value
Publication number	US-11760057-B2
Application number	US-201817271316-A
Country	US
Kind code	B2
Filing date	Aug 31, 2018
Priority date	Aug 31, 2018
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

The present disclosure provides a fabric laminate. In an embodiment, the fabric laminate includes a fabric sheet, a coating layer, and a tie layer. The fabric sheet is composed of propylene-based polymer fibers. The coating layer is composed of one or more ethylene-based polymers. The tie layer is located between the fabric sheet and the coating layer. The tie layer is composed of at least 50 wt % of a crystalline block composite (CBC) and an optional blend component. The CBC includes (i) an isotactic crystalline propylene homopolymer (iPP); (ii) an ethylene/propylene copolymer; and (iii) a diblock with the formula (EP)-(iPP). The CBC has a block composite index (CBCI) from 0.1 to 1.0. The fabric laminate has a peel force from 20 N/15 mm to 40 N/15 mm.

First claim

We claim:

1. A fabric laminate comprising:
a fabric sheet composed of propylene-based polymer fibers;
a coating layer composed of one or more ethylene-based polymers;
a tie layer located between the fabric sheet and the coating layer, the tie layer composed of
at least 50 wt % of a crystalline block composite (CBC) and an optional blend component, the CBC comprising
(i) an isotactic crystalline propylene homopolymer (iPP);
(ii) an ethylene/propylene copolymer; and
(iii) a diblock with the formula (EP)-(iPP);
the CBC having a block composite index (CBCI) from 0.1 to 1.0,
wherein the fabric laminate has a peel force from 20 N/15 mm to 40 N/15 mm.

2. The multilayer sheet of claim 1 wherein the tie layer is in direct contact with the fabric sheet and the tie layer is in direct contact with the coating layer.

3. The fabric laminate of claim 2 wherein
the coating layer is composed of a blend of an ethylene/α-olefin multi-block copolymer and an ethylene/α-olefin copolymer;
the tie layer consists of the CBC; and
the fabric laminate has a peel force from 20 N/15 mm to 40 N/15 mm.

4. The fabric laminate of claim 2 wherein the coating layer is composed of a blend of an ethylene/α-olefin multi-block copolymer and an ethylene/α-olefin copolymer;
tie layer comprises from 70 wt % to 90 wt % of the CBC and from 30 wt % to 10 wt % of a blend component that is an ethylene/α-olefin copolymer; and
the fabric laminate has a peel force from greater than 20 N/15 mm to 40 N/15 mm.

5. The fabric laminate of claim 2 wherein
the coating layer consists of an ethylene/α-olefin block copolymer;
the tie layer consists of the CBC; and
the fabric laminate has a peel force from 20 N/15 mm to 40 N/15 mm.

6. The fabric laminate of claim 2 wherein
the coating layer consists of an ethylene/α-olefin multi-block copolymer;
tie layer comprises from 70 wt % to 90 wt % of the a CBC and from 30 wt % to 10 wt % of a blend component that is an ethylene/α-olefin copolymer; and
the fabric laminate has a peel force from greater than 20 N/15 mm to 40 N/15 mm.

Assignees

• Dow Global Technologies Llc

Inventors

• Ultsch Stefan
• Hu Yushan
• Van Dun Jozef J I
• Ming Ming

Classifications

• B32B5/022 Primary

  Non-woven fabric · CPC title

• B32B7/12 Primary

  using interposed adhesives or interposed materials with bonding properties · CPC title

• B32B5/24 Primary

  one layer being a fibrous or filamentary layer · CPC title

• B32B2307/718

  Weight, e.g. weight per square meter · CPC title

• B32B2419/06

  Roofs, roof membranes · CPC title