Multilayer films and laminates containing slip agents

Patent metadata

Field	Value
Publication number	US-12049065-B2
Application number	US-202318383653-A
Country	US
Kind code	B2
Filing date	Oct 25, 2023
Priority date	Dec 14, 2018
Publication date	Jul 30, 2024
Grant date	Jul 30, 2024

Abstract

The present disclosure provides a multilayer film. The multilayer film includes at least two layers including a sealant layer and a second layer in contact with the sealant layer. The sealant layer contains (A) a first ethylene-based polymer having a density from 0.900 g/cc to 0.925 g/cc and a melt index from 0.5 g/10 min to 30 g/10 min; and (B) a polyethylene-polydimethylsiloxane block copolymer having a weight average molecular weight from 1,000 g/mol to 10,000 g/mol. The second layer contains a second ethylene-based polymer.

First claim

We claim:

1. A laminate comprising:
a film comprising a sealant layer comprising:
(A) a first ethylene-based polymer having a density from 0.900 g/cc to 0.925 g/cc and a melt index from 0.5 g/10 min to 30 g/10 min;
(B) a polyethylene-polydimethylsiloxane block copolymer comprising (i) at least one polyethylene block formed from hydrogenating at least one polybutadiene block comprising 1,2-butadiene, the at least one polyethylene block having a crystallinity from 0% to 5% and (ii) at least one polydimethylsiloxane block, the polyethylene-polydimethylsiloxane block copolymer having a weight average molecular weight from 1,000 g/mol to 10,000 g/mol;

a substrate; and
an adhesive layer adhering the film to the substrate;
wherein crystallinity is calculated in accordance with Equation (1), where x is the mole % of 1,2-butadiene in the at least one polybutadiene block prior to hydrogenation, as measured by proton Nuclear Magnetic Resonance Spectroscopy ( 1 H NMR):

Crystallinity
⁢

(

wt
⁢

⁢
%

)

=

{

0.0136

x
2

-

2.436
x

+
61.475

,

if
⁢

x

<
30.39

0
,

if
⁢

⁢
x

≥
30.39

.

Equation
⁢

(
1
)

2. The laminate of claim 1 , wherein the polyethylene-polydimethylsiloxane block copolymer comprises from 40 wt % to 55 wt % of the at least one polyethylene block and from 60 wt % to 45 wt % of the at least one polydimethylsiloxane block, based on the total weight of the polyethylene-polydimethylsiloxane block copolymer.

3. The laminate of claim 2 , wherein the sealant layer comprises from 0.01 wt % to 2.0 wt % polyethylene-polydimethylsiloxane block copolymer, based on the total weight of the sealant layer.

4. The laminate of 3 , wherein the film is a multilayer film and comprises a core layer and a skin layer, wherein the core layer is between the skin layer and the sealant layer; and
the skin layer is in contact with the adhesive layer.

5. The laminate of claim 4 wherein the sealant layer has a laminate 60° C. Aged coefficient of friction (COF) from 0.01 to 0.8 as measured in accordance with ASTM D1894 after the adhesive layer of the laminate is cured for seven days at 25° C. and then the laminate is heated for seven days at 60° C.

6. The laminate of claim 5 , wherein the sealant layer has a a haze of from 0% to 5%.

7. The laminate of claim 6 wherein, prior to the film being combined with the substrate and the adhesive layer, the sealant layer has a pre-lamination coefficient of friction (COF) from 0.01 to 0.45, wherein the film is produced as a film roll and the pre-lamination COF is measured in accordance with ASTM D1894 after the film roll is stored for one week at 25° C.

8. The laminate of claim 1 wherein the 1,2-butadiene is present in a polybutadiene block prior to hydrogenation in an amount from 29.0 mol % to 48.5 mol %.

9. The laminate of claim 1 wherein the adhesive layer comprises an adhesive composition selected from the group consisting of polyurethane adhesive, polyacrylate adhesive, and combinations thereof.

10. The laminate of claim 9 wherein the adhesive layer has a dry coating weight from 0.5 g/m 2 to 3.0 g/m 2 .

11. The laminate of claim 1 , wherein the substrate comprises a component selected from the group consisting of a second ethylene-based polymer, a propylene-based polymer, polyamide, polyester, ethylene vinyl alcohol copolymer, polyethylene terephthalate, ethylene vinyl acrylate copolymer, ethylene methyl acrylate copolymer, ethylene ethyl acrylate copolymer, ethylene butyl acrylate copolymer, ethylene acrylic acid copolymer, ethylene methacrylic acid copolymer, an ionomer of ethylene acrylic acid, an ionomer of methacrylic acid, maleic anhydride grafted ethylene-based polymer, a metal foil, and combinations thereof.

Assignees

• Dow Global Technologies Llc

Inventors

• Sharma Rahul
• Weinhold Jeffrey D
• Hustad Phillip D
• Donaldson Megan E
• Li Xiaoyong
• Neuman Joseph C
• Yang Yang

Classifications

• Y10T428/31663

  As siloxane, silicone or silane · CPC title

• C08G81/024

  Block or graft polymers containing sequences of polymers of C08C or C08F and of polymers of C08G · CPC title

• B32B2553/00

  Packaging equipment or accessories not otherwise provided for · CPC title

• B32B2439/70

  Food packaging · CPC title

• B32B2307/746

  Slipping, anti-blocking, low friction · CPC title