# US 9,752,325 B2 · Multi-layer film having a high puncture resistance and resistance to further tearing

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- Number: US 9,752,325 B2
- Document ID: US9752325B2
- Status: Granted
- Kind: B2
- Application number: 13/491,662
- Filed: 2012-06-08
- Published: 2012-09-27
- Granted: 2017-09-05
- Earliest claimed: 2009-12-11
- Assignees: Infiana Germany GmbH & Co. KG
- Applicants: Heinz Engelhard
- Inventors: Heinz Engelhard
- Web page: https://patentgrep.com/patent/US9752325B2

## CPC

- E04D 5/10: by making use of compounded or laminated materials, e.g. metal foils or plastic films coated with bitumen
- B32B 11/04: comprising such {bituminous or tarry} substance as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a glass layer B32B17/06)}
- B32B 27/06: as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)}
- B32B 27/08: of synthetic resin
- B32B 27/28: comprising synthetic resins not wholly covered by any one of the sub-groups {B32B27/30 - B32B27/42}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/34: comprising polyamides
- C08L 23/10: Homopolymers or copolymers of propene
- C08L 23/12: Polypropene
- C08L 23/142: {at least partially crystalline copolymers of propene with other olefins}
- C08L 77/06: Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence)
- C09J 7/29: Laminated material (metallised plastics C09J7/22)
- C09J 2301/162: the carrier being a laminate constituted by plastic layers only
- C09J 2423/006: in the substrate
- C09J 2477/006: in the substrate
- Y10T 428/2848: Three or more layers
- Y10T 428/31757: Polymer of monoethylenically unsaturated hydrocarbon
- E04D: ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS (coverings of outer walls by plaster or other porous material E04F13/00)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A multi-layer film comprising a layer (a) and a layer (c), each layer comprising at least one propylene copolymer in a quantity of at least 30% by weight and at least one propylene homopolymer in a quantity of at least 20% by weight, in each case relative to the total quantity of the layer (a) or (c), at least one inner layer (b) based on at least one homo- and/or co-polyamide having isophorondiamine units as polyamide components, and further comprising adhesion promoter layers (d) and (e) arranged between the layers (a) and (b) and between the layers (b) and (c), respectively, each adhesion promoting layer being based on at least one modified thermoplastic olefin homopolymer or olefin copolymer; a sealing sheet comprising such a multi-layer film, and the use of such a multi-layer film for covering roofs.

## Claims

### Claim 1

A sealing sheet comprising:
a multilayer film consisting of
(a) a layer composed of
at least 30% by weight, based on the total weight of the layer (a), of at least one propylene copolymer,
at least 20% by weight, based on the total weight of the layer (a), of at least one propylene homopolymer, optionally a further polyolefin, and
optionally up to 30% by weight of additives, based on the total weight of the layer (a),
whereby the components of layer (a) always give a total of 100% by weight,
(b) at least one internal oil barrier layer based on at least one homo- and/or co-polyamide having isophoronediamine units as polyamide components and on at least one homo- and/or co-polyamide having no isophoronediamine units as polyamide components,
(c) a layer composed of
at least 30% by weight, based on the total weight of the layer (c), of at least one propylene copolymer,
at least 20% by weight, based on the total weight of the layer (c), of at least one propylene homopolymer,
optionally a further polyolefin and
optionally up to 30% by weight of additives, based on the total weight of the layer (c),
whereby the components of layer (c) always give a total of 100% by weight;
(d) a first adhesion-promoter layer based on at least one modified thermoplastic olefin homo- or co-polymer and arranged between the layer (a) and the layer (b), and
(e) a second adhesion promoter layer based on at least one modified thermoplastic olefin homo- or co-polymer and arranged between the layer (b) and the layer (c),
wherein said multilayer film has
a puncture resistance in accordance with ASTM E154-10 of at least 250 N,
a tensile strength in accordance with ASTM D1970 of at least 150 N, and
an Elmendorf tear-propagation resistance in accordance with ISO 6383-2 of at least 1500 mN;
and a sealing composition layer (h) based on a self-adhesive bitumen-based sealing composition or a self-adhesive rubber-based sealing composition arranged on the layer (a) or the layer (c).

### Claim 2 (depends on 1)

The sealing sheet as claimed in claim 1, wherein the layer (b) of the multilayer film comprises at least 30% by weight, based on the total weight of the layer (b), of at least one copolyamide comprising isophoronediamine units.

### Claim 3 (depends on 1)

The sealing sheet as claimed in claim 1, wherein the proportion of isophoronediamine units in the polyamide component of the layer (b) is at least 1% by weight, based on the total weight of said polyamide component.

### Claim 4 (depends on 3)

The sealing sheet as claimed in claim 3, wherein the proportion of isophoronediamine units in the polyamide component of the multilayer film layer (b) is at least 3% by weight, based on the total weight of said polyamide component.

### Claim 5 (depends on 1)

The sealing sheet as claimed in claim 1, wherein the polyamide component comprising isophoronediamine units of layer (b comprises aliphatic or aromatic dicarboxylic acid units.

### Claim 6 (depends on 5)

The sealing sheet as claimed in claim 5, wherein the polyamide component comprising isophoronediamine units of layer (b) comprises aromatic dicarboxylic acid units.

### Claim 7 (depends on 1)

The sealing sheet as claimed in claim 1, wherein the layer (a) of the multilayer film or the layer (c) of the multilayer film, or both, may each independently comprise at least 35% by weight, based in each case on the total weight of the respective layer, of at least one propylene co-polymer.

### Claim 8 (depends on 1)

The sealing sheet as claimed in claim 1, wherein the layers (a) and (c) of the multilayer film have identical polymer components and identical layer structures.

### Claim 9 (depends on 8)

The sealing sheet as claimed in claim 8, wherein the layers (a) and (c) of the multilayer film have identical layer thicknesses.

### Claim 10 (depends on 1)

The sealing sheet as claimed in claim 1, wherein the multilayer film has a symmetrical construction relative to a central layer (b).

### Claim 11 (depends on 1)

A method of sealing a building or part of a building against water or protecting a building or part of a building against weathering influences, said method comprising covering said building or part of a building with a sealing sheet as claimed in claim 1.

### Claim 12 (depends on 1)

The sealing sheet as claimed in claim 1, further comprising a removable protective layer (g) as protective covering for the sealing composition layer (h).