Low coefficient of friction laminates

Patent metadata

Field	Value
Publication number	US-12098313-B2
Application number	US-201816620343-A
Country	US
Kind code	B2
Filing date	Jun 4, 2018
Priority date	Jun 9, 2017
Publication date	Sep 24, 2024
Grant date	Sep 24, 2024

Abstract

The present disclosure provides a laminate. The laminate includes a first film and a second film, wherein the first film is laminated to the second film. The first film includes a sealant layer containing (A) an ethylene-based polymer; and (B) a slip agent blend containing (i) a first polydimethylsiloxane having a number average molecular weight (Mn) from 30,000 g/mol to less than 300,000 g/mol; and (ii) a second polydimethylsiloxane having a number average molecular weight (Mn) from 300,000 g/mol to 2,000,000 g/mol.

First claim

We claim:

1. A laminate of comprising:
(1) a coextruded multilayer film consisting of a sealant layer, a core layer, and a release layer the sealant layer consisting of
(A) one or more first ethylene-based polymers consisting of (i) ethylene monomer and (ii) optional C 3 -C 10 α-olefin comonomer;
(B) a slip agent blend consisting of
(i) from 1 wt % to less than 50 wt % of a first polydimethylsiloxane (PDMS) having a Mn from 30,000 g/mol to less than 50,000 g/mol;
(ii) from greater than 50 wt % to 99 wt % of a second PDMS having a Mn from 300,000 g/mol to 550,000 g/mol;

(C) optional first additives;

the core layer in contact with the sealant layer, the core layer consisting of a second ethylene-based polymer selected from the group consisting of a linear low density polyethylene (LLDPE), a low density polyethylene (LDPE), and combinations thereof; and optionally up to 5.0 wt % of second additives, based on the weight of the core layer;
the release layer in contact with the core layer, the release layer consisting of a third ethylene-based polymer selected from the group consisting of a linear low density polyethylene (LLDPE), a low density polyethylene (LDPE), and combinations thereof, and optionally up to 5.0 wt % of third additives, based on the weight of the release layer;
(2) an adhesive layer that is a single layer in direct contact with the release layer and a second film; and
(3) the second film comprising a layer comprising polyethylene terephthalate (PET), ethylene vinyl alcohol (EVOH) copolymer, a polyamide, or a combination thereof;
wherein each ethylene-based polymer in the coextruded multilayer film has a density from 0.87 g/cc to 0.93 g/cc.

2. The laminate of claim 1 wherein the one or more first ethylene-based polymers is selected from the group consisting of (i) an ethylene plastomer/elastomer having a density from 0.870 g/cc to 0.917 g/cc, (ii) a low density polyethylene (LDPE) having a density from 0.915 g/cc to 0.930 g/cc, (iii) a linear low density polyethylene (LLDPE) having a density from 0.910 g/cc to 0.930 g/cc, and (iv) combinations thereof.

3. The laminate of claim 1 wherein the one or more first ethylene-based polymers of the sealant layer is
an ethylene plastomer/elastomer having a density from 0.870 g/cc to 0.917 g/cc;
a first low density polyethylene having a density from 0.915 g/cc to 0.930 g/cc; and
a second low density polyethylene having a density from 0.915 g/cc to 0.930 g/cc wherein the second low density polyethylene is different than the first low density polyethylene.

4. The laminate of claim 3 wherein the sealant layer is in direct contact with the core layer and the core layer is in direct contact with the release layer.

5. The laminate of claim 4 wherein the first additive is present and the first additive is selected from the group consisting of antiblock agents, antioxidants, antistatic agents, stabilizing agents, nucleating agents, colorants, pigments, ultra violet (UV) absorbers, stabilizers, flame retardants, compatibilizers, plasticizers, fillers, processing aids, antifog additive, crosslinking agents, and combinations thereof.

6. The laminate of claim 5 wherein the laminate has five layers.

7. The laminate of claim 1
wherein an outermost surface of the sealant layer is an outermost surface of the laminate and the sealant layer has a coefficient of friction at 12 m/min of from 0.01 to 0.55 as measured using an at line COF testing apparatus according to T 2 =T 1 e μβ , wherein T 1 is the tension of a sample before wrapping around a 304 stainless steel static roller, T 2 is a tension of the sample after wrapping around the static roller, μ is the coefficient of friction, and β is a 0.52 radians wrap angle across the static roller surface.

8. The laminate of claim 1 , wherein the slip agent blend consists of:
(i) from 1 wt % to less than 50 wt % of the first PDMS is a dimethylhydroxysilyl terminated PDMS; and
(ii) from greater than 50 wt % to 99 wt % of the second PDMS is a dimethylhydroxysilyl terminated PDMS; based on the total weight of the slip agent blend.

9. The laminate of claim 8 , wherein the sealant layer comprises from 0.1 wt % to 5.0 wt % of the slip agent blend, based on the total weight of the sealant layer.

10. The laminate of claim 9 , wherein the sealant layer comprises:
(i) from 0.20 wt % to 0.5 wt % of the first PDMS; and
(ii) from 1.0 wt % to 1.5 wt % of the second PDMS, based on the total weight of the sealant layer.

11. The laminate of claim 1 , wherein the one or more first ethylene-based polymers consist of an ethylene plastomer/elastomer and a low density polyethylene (LDPE).

12. The laminate of claim 10 , wherein the second film is a monolayer film.

13. The laminate of claim 12 , wherein the second film comprises polyethylene terephthalate (PET).

14. The laminate of claim 1 , wherein the adhesive layer comprises an adhesive selected from the group consisting of a polyether adhesive, a polyurethane adhesive, or a combination thereof.

15. The laminate of claim 7 , wherein the adhesive layer comprises a polyether-based polyurethane adhesive and the coefficient of friction is from 0.20 to 0.55.

16. The laminate of claim 13 , wherein the adhesive layer comprises a polyester-based polyurethane adhesive.

Assignees

• Dow Global Technologies Llc

Inventors

• Llop Cosme
• Ongayi Owendi
• Amici Marco
• Prele Patrick
• Chevallier Celine

Classifications

• Y10T428/31663

  As siloxane, silicone or silane · CPC title

• Y10T428/31504

  Composite [nonstructural laminate] · CPC title

• Y10T428/31

  Surface property or characteristic of web, sheet or block · CPC title

• B32B2383/00

  Polysiloxanes · CPC title

• B32B2307/748

  Releasability · CPC title