WO2011028701A1

WO2011028701A1 - Multilayer polypropylene films and methods of making and using same

Info

Publication number: WO2011028701A1
Application number: PCT/US2010/047312
Authority: WO
Inventors: Lea Ann Nairn; Marco Vinicio Araya Vargas
Original assignee: Fina Technology, Inc.
Priority date: 2009-09-01
Filing date: 2010-08-31
Publication date: 2011-03-10
Also published as: JP2013503756A; EA201270319A1; US10144201B2; EP2473349A4; US20110052929A1; TWI556957B; BR112012004713B1; EP2473349A1; EP2473349B1; US9174384B2; US20160001531A1; CN102481766A; CN102481766B; TW201119861A; KR20120059499A; BR112012004713A2

Abstract

A method including forming a bilayer polymer film having an oriented polypropylene film and a metallocene-catalyzed polypropylene film wherein the metallocene-catalyzed polypropylene film has a seal initiation temperature of from 80°C to 130 °C. A laminate including a biaxially oriented polypropylene film, a metallocene-catalyzed polypropylene film, and a substrate, wherein the metallocene-catalyzed polypropylene turn is disposed between the biaxially oriented polypropylene film and the substrate.

Description

ΠΪΕΕ

MULTILAYER POLYPROPYLENE FILMS A D METHODS OF MAKI G Am USI G SAME

CROSS REFBRENCE TO RELATED APPLICATIONS fOOIMj No; applicable.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

|O0O2 No! applicable.

REFERENCE TO A MICROFICHE APPENDI X

1 0 31 Ho applicable

BACKGROUND

I^mAA_:b N4

{0064} This disclosure relates to methods of preparing polypropylene dims. More spec itk a ly, this disclosure relates to «mhi4ayer polypropylene films for use in thcnttoAanrination .applications arid methods of nurkin and using same. B ckhand fOOOS Synthetic polymeric materials, particularly polypropylene resins, are mamdactnred into a variety of end-use articles ranging item medical devices to materi ls packaging. Many industries, such as the packaging industry, utilize these polypropylene materials n various mamdaeturing rocesses to create a variety of finished goods including containers, packaging dims for food packaging, iherrnoriatmnation films for book covers, etc. For example, producing themio- laminadon films nay involve extruding a layer of ethylene vinyl acetate (EVA) onto a plastic film (e.g., polypropylene) to form a hi layer film. Next, the EVA aide of the bilayer film may e t ermo-l¾minait'd ddTerem types o siibstrates (e.g.. paper, wood, etc.) to form polypropylene- EVA laminates,

fOO j ine challenge to the utility of polypropylene-BVA laminates is achieving sufikient bond strength between the polypropylene film and the EVA layer. In order 1.0 improve the bonding between these layers, a be layer may be placed between the polypropylene 11m and the EV A layer. However, adding a tie layer Increases the cost associated with producing such .materials, and may detrimentally affect one of more physical properties (e.g., low i¾ese, high gloss) of the material Thus an ongoing need exists for novel laminate compositions having desirable physical and/or mechanical properties,

SUMMARY

(§007] Disclosed herein is a method including forming a bhayer polymer film having an oriented polypropylene film and a meiall cene-cataiyxed polypropylene film wherein the metallocene-ealalyzed polypropylene iiim has a seal imitation temperature of from SO A^' to 130 *C The bhayer polymer film may have of an oriented polypropylene film and a metal Soeene- catalyzed polypropylene turn. The metalfooene-cafalyzed poly mpylene film may have a thickness of from 0.1 mil to 20 mil. The oriented polypropylene iiim may include uniaxial I y oriented polypropylene him, biaxiaiiy oriented polypropylene film, or combinations thereof The oriented polypropylene Mm may be corona treated. The oriented polypropylene fiim may have a thickness of from 0.1 mil to 20 mil The biiayer polymer film may have an adhesive strength of from O. I M to lb Ibf . The biiayer polymer film may have a gloss 45° of from 60 to 99. The biiayer polymer lira may have a ha¾e percentage of from 0,5% to 10%. The biiayer polymer film may have a thickness of from 0,2 mil to 20 mil. The forming of the biiayer polymer film may occur at a temperature of from 420 ^:T to 530 *F. The farming of the bhayer polytner film may occur by extrusion coating the metaliocene-ealalyzed polypropylene nlm onto the biaxiall oriented polypropylene trine The method m further include thermolaoanatmg the hi layer polymer film with a substrate to form a laminate wherein the nieta!!oeene-catalyxed polypropylene ilm is disposed between the biaxiahy oriented polypropylene Mm and the substrate, lire substrate may include paper, plastic meiat wood, fabric, glass or combinations thereof, The laminate may be substantially free of ethyl enc-yinyi --acetate. The oriented polypropyl ne II be may be subjected t surface modification process. An article as produced b any of the previously disclosed methods,

f{KK$^'| Also disclosed herein is a laminate including a biaxially oriented polypropylene him, a meia!io ene-c&talyzed polypropylene film, and a substrate wherein ihe m.etaiiocene ataiyxed polypropylene film is disposed between the biaxially oriented polypropylene film and the substrate. The metallocene-catalyxed polypropy lene film may have a seal in ti tion temperature of from 80 *C to 150 * C, The laminate may be substantially tree of ethylene--v|nykieeiate.

BRIEF DESCRIPTION OF THE DRA INGS

|β<Μ$| for a more complete understanding of the present disclosure and the advantages thereof reference is now made to the following brief description, taken in connection with the accompanying drawings and detailed description, wherein like reference .numerals represent like parts,

f(l(H.0J Figure 1 is a schematic diagram of an extrusion coating apparatus.

I ] Figures 2A and 2B illustrate a 1 S0° peel force test,

jOOOj Figure 3 is a plot of force as a function of extension for the 180° peel test results for Sample I from Example ! . f(M)l3J Figure 4 s a plot of feree as a function of extension for the I SO* pee! test results for Sample 2 from Example 2,

0 14| Figure 5 is a plot of force as a function of extension for the I BO* peel test results for Sample ii ir n.: Example 3.

flMfiSj figure is a plot of three as a function of extension for the i KC peel test results for Sample 4 from Example 4.

{0016} figure 7 Is plot of average l res as a function of extension lor the W peel test result; lor Samples 1 -4 from Examples 1-4,

fO0!7J Figures 8-1 i are plots of force as a. function of extension for the 1 Sir' peel test results lor Samples 9-12 i ron; Example 7,

jiNH^'8j Figure 12 s a plot of average force as a Simction of extension for the peel test results tor Samples 9-12 from Example 7,

figure 13 is a plot of average force as a function of extension for the ISO peel test results for Sample if l l ₅ and 12 from Examples 2 and 7.

DETAILED DESCRIPTION

li¾ttfy It should be understood at the outset that although an illustrative implementation of one or mare embodiments arc provided below, the disclosed systems and/or methods may be implemented using any number of techniques, whether currently known or i existence, The disclosure should in no way be limited to the illustrative inrplernemaiions, drawings, and iechnlqnes illustrated b low, including the exemplary designs and hop I emanations iihmrated and described herein, bat may be modified within the scope of the appended claims along with their foil seope of equivalents. [002!] As used herein oriented polypropylene is designated ^"\>PPy' meialloeene-catalyzed polypropylene is designated "mPP;" bi layer polymer film is. designated "EPF;" biaxial!y oriented polypropylene is designate "BOFP;^,A high crystaHrnity polypropylene is designated "IJCFPd^" polypropylene heierop asie copolymers are designated *PPHC;^W ethylene propylene rubber is designated 'iiPRT mdi flow rate is designated "MFR;" metal loeene-eatsiyzed random ethylene propylene copolymer is designated ¾ EPC ^" seal initiation temperature k designated ⁱ SlTo percentage xylene solubles is designated " 8¾Τ and ethylene vinyl acetate is designated "EVA." M122J Disclosed herein are multilayer polymer films and methods of making and using same. The multilayer polymer films include at least one oriented poiypropylene (oPP) dim layer and at bast one aa.aaiioeene-caiaiyzed polypropylene (mPP.) film layer. In an embodiment the multilayer film includes reater than 2 layers, alternatively 3, 4, 5, or 6 layers, Alternatively, the multilayer -film includes 2 layers. Hereinafter, for simplicity, the discussion will refer to hilayer polymer films although it is to be understood that polymer films having greater than two layers are also contemplated,

|0β23) In an embodiment, a hilayer polymer film (EPF) may have an oriented polypropylene

(oPP) fil layer and a tneta!Joeene-catalymf polypropylene (mPP) film layer,

\9&24\ In an embodiment, the BPF includes an oriented polypropylene film layer. The polypropylene may be a homopoiymer. a high crystal Unity polypropylene, polypropylene heterophasie copolymer, or combinations (e.g., blends) xhereoi The polypropylene may he formed into a 111m and oriented to produce an oriented polypropylene film layer as described in more detail herein.

|O02S] The polypropylene may be a homopoiymer provided however thai the homopoiymer ma eon lain up to 5% of another aipha-oledn, including but not limited to C C_* alpha-oleiins such as ethylene -and l -buieae, Despite toe potential presence of small amounts of other alpha-oieims., the polypropylene is generally referred to as a polypropylene bomopo!ymer (or substantially a homopoly er). Polypropylene htwnopoiyrners suitable lor use in this dis l su e may include any type of polypropylene known in the ait with the aid of this disefos-ure. for exam le, the polypropylene iaanopolyme may be. isotaetie polypropylene, hemhlsoiactle, or combin ti ns thereof! polymer is 'Isotactkf' when all of its pendant groups are arranged on the same side of the cham. In hsmhisotactie polymer, every other repeat unit has a random aubstitaeni.

[0i 2b| A polypropylene suitable for use in this disclosure may be characterised by a number average- molecular weight n of .from 3.3x 10 Daltons to S.3xi if Dakons, alternatively from 4.1 x 10⁴ Data to ?. S M)⁴ Daltons, alternatively from 5.0x10⁴ Daltons to b.bx ll Daltons ; a weight average molecular weight of from 3,0x10^s Daltons^' to 6.2x 10^'' Daltons, alternatively from 3.5x 10^s Data to 527x 10* Dahoos, alternatively from 4.0x10⁵ Daltons to 5.1 x1 0^" Daltons; a poiydispersity index of from 4,9 to 1 1.0, alternatively from 6.0 to 10.0, aUeroa lvcly bom 7.0 to 9.0; and a -average molecular weight of from 927x10' Daltons to 3.2x10* Daltons, alternatively from I x Uf Daltons to 2.Sxi 0⁶ Daltons, altsematively f rom 1 .7x10* Daltons in 2.5x 10" Daltons. Specifically, for a polymeric composition the number-average molecular weight hf. Is given by e uation 1 :

M₈ = A CD

where M* is the raofe-fraciion (or the number-fraction) of molecules whose weight is M_x The weight-average molecular weight _w is given by equation 2:

M^Zw_;M_s (2)

where W is the wesglu-iraetion of molecules whose weight is M*, The poiydispersky index (PDI ) Is given by equation 3;

0 P i ··^» M, ^;M, (3)

The z-averag molecular weight (M is given by equation 4:

where w_x is the weigh sd eu on of molecules whose weight s M

|iM 27| in -an embodiment, a polypropylene suitable for use in this disclosure may have a der.isi.ty of bom 0.8 5 g cc to 0.920 g cc\ alternatively from. 0.9(H) g/cc io 0,9 i 5 g/cc. and alternatively bom 05⁾05 g/cc to 0.913 g/ec as determined in accordance with ASTM D^'1.505: a melting temperature of from 150 T: to 170 °C, alternatively from 155 °€ to 168 «C, and alternatively irom 160 to 105 X.l as determined by ciiilere?rtial scannin ca!onmetry: a. melt .flow rate of rom 0.5 g/i Omin. to 30 g/10min., alternatively irom 1 .0 g/I min, to ! 5 g/!0smm, and alternatively from 1 .5 g/l niin, to 5.0 g/I Omin. as detemtmed in accordance with ASTM 101258 condition .Τ: a tensile modulus of .from 2005)00 psi io 350,000 psi; alternatively irom 220,000 psi to 320,000 gsi, and alternatively .from 250,000 psi to 520,000 psi as determined io accordance with ASTM DOTS: a tensile stress at yield of from 3,000 psi to 0,000 psi, alternatively rom 3,500 psi 10 5,500 psi, and alternatively from. 4,000 psi to 5,500 psi as determined in accordance with ASTM D63S: a tensile strain at yield of from 5% io 30%. alternatively .from 5% io 20%_; and alternatively from 550 t 13% as determined in accordance with ASTM: 038; a lexma! modulus of irom 120,000 psi 10 330,000 psi, aUcrnatively from 190,000 psi to 31.0,000 psi, and alternatively of from 220,000 psi m 300,000 psi as determined in accordance with ASTM D790; a Gardner impact of irom 3 In-ib to 50 inOh, alternatively from 5 in-lb to 30 in4b, and alternatively irom 9 in- lb to 25 in-ib as determined in accordance with ASTM D2463; a blotched iz.od Impact Strength of from 0.2 f lb/in to 20 it ih/in, alternatively from 0.5 it lb/in to 15 ft lb/in, and alternatively from 0.5 fr lb/in to 10 ft lb/in as determined in accordance with ASTM D256A; a hardness shore O of from. 30 io 90, alternatively from 50 to 8 , and alternatively frana 60 to 80 s determined in accordan e with ASTM D2240; and a heat distortion temperature of from 50 *€ io 125 *C\ aUernniivd v from 8 to 1 15 . aad alternatively from 90 -°C to 1 10 V m determined in accordance with ASTM D6 8.

101)28) Examples of polypropylene homopolyrners suitabl lot ose in this disclosure include without limitation grades 33? L 3271 , 3270, 3276, and 3377, which ate polypropylene honiopoiynrers commercially available iiom Total Petrochemicals USA, inc. In an embodiment, the polypropylene bomopolymer (e.g., grade 3377} has generally the physical properties set forth i Table I ,

Table 1

p ^'29 In another embodiment, the polypropylene may be a high crystallirsity polypropylene homo oiymer (BCFF). The HCPF may contain. primarily isotactk- polypropylene. The isotaetieity in polymers may be measured via ^{: '}€ R spectroscopy using mcso pentads and ca be expressed, as percentage of meso pentads (%mmn¾n)- As used herein, the term Tneso pentads^" refers to successive methyl groups located on the same side of the polymer chain, in an em odiment the BCF.P has a meso entads percentage of greater than 97%, or greater h 98%, or greater th&u 99%. The MCPP may have some amount of atactic or amorphous polymer. The atactic portion of the polymer is soluble In xylene, and is thus termed the xylene soluble If action (XS%). hi determining XS%. the polymer is dissolved in boiling xylene and then the solution cooled to 0 °€ that results in the precipitation of the isotactic or crystalline portion o f the polymer. The ^'XS% is that portion of the original amount that remained soluble in the cold xylene. Consequently, the XS% in the polymer is indicative of the extent of crystalline polymer i rmed. The total amo t of -polymer (100%) is the sum of the xylene soluble fraction ami the xylene imsokihte fraction, as determined m accordance with ASTM D5492-9B, In an embodiment, the ! CPP has a xylene soluble fraction of less than I ,$%_> or less than 1 ,0%, or less than 0.5%.

BOj In aii embodiment an HCPP suitable ibr use in this disclosure ma have a. density of from 0.895 g/ce to 0.920 g/ec\ alternatively from 0.900 g/cc to 0,915 g/eo, and alternatively from. 0.905 g/ce to 0.915 g/ec as determined in accordance with ASTM D 1 05; a meh flo rate of from 0,5 g/10 mm. to 30 g/1.0mia, alternatively from 1.0 g/iO in, to 15 g/d miimand alternatively from 1.5 g/l Omin, to 5.0 g lUmrn, as determined in accordance with ASTM 01238; a secant modulus in the machine direction. (MO) of from 350,000 psi to 420,000 psi: alternativel from 380,000 psi to 420,000 psi, and lternati el from 400,000 psi to 420,000 psi as detennhied in accordance with AST DS82; a secant modulus in the transverse direction (TO) of from 400,000 psi to 700,000 si, alternatively from 500,000 psi to 700,000 psi, and alternatively from 600,000 psi to 700,000 psi as determined in. accordance with ASTM DBS2; a tensile strength at break in the MD of from 19,000 psi to 211,000 psi, alternatively from 22,000 psi to 28,000 psi, and alternatively irom 25,000 psi to 28,000 pst as determined in accordance with ASTM DSS2; a tensile strength at break in the TD of from 20.000 psi to 40,000 psi, alternati vely from 30,000 psi to 40,000 psi, and alternatively of from 55,000 psl io 40,000 ρύ as determined in accordance with ASTM D882; an. elongation at break n the MD fixnn 50% to 200%, alternatively from 100% to 180%, and alternatively from 120% to 1 50% etermined in accordance with ASTM D882; aa elongation at break in the ΊΙ) of from 50% to 1 0%, alternatively from 00% to 100%, and alternatively from 80% to 100% s determined io accordance with ASTM 0882; a melting temperature of from 150 XI to 170 %2 alternatively from 155 °C to 170 «C, and alternatively from 160 °C to 170 *€ s deterni ed by differencial scanning calormietry; a gloss at 45 of from 70 io 95, alternatively from 75 to 90, and alternatively front 80 to 90 as determined in accordance with ASTM 1⁾2457; a percentage ^'haxe of Irom 0,5% to 2,0%, alternatively from 0.5% to 1.5%>, and alternatively from 0.555 to 1 ,0% s determined in accordance with ASTM 1⁾1003; and a water vapor transmission rate of from 0, 15 to 0.30 g-mii/100in"Vday, alternatively from 0.15 to 0,25 g-railO Oirnday, and alternatively from 0,20 io 0,21 gmdl/KlihirVday as determined in accordance with ASTM Fl 249-90. |0 311 An e am le of an HCFF suitable for use in this disclosure includes without limitation grade 1>270, which is an HCFP commercially available irom Total Petrochemicals USA, inc. The UC!FP {e.g., grade 3270) may generally have the physical properties set forth In Table 2.

Table 2

Pro crOis ical V loi? Test. Meth d

PtryskaS

Deas y, ,¾ cc 0,910 AST D 1505

Melt ass-Fknv Rate (MFR) (230 %T2. ! 6kg). g 1 mm. 2.0 AS^' I^'M D1258

BOW e«haak^>al

Secant Modulus; MD, psi 420,000 AST M 882

S cam .Modulus TD_> pss 700,900 AST 882

Teassle St ength at Break MIX psi 28,000 ASTM 82

Teasile Strength at Break I^'D, pss 3Τ6θ0 AST

Etoneaooa at Break MD, % ASTM 2

Eiensjadoa at Break T , % 60 ASTM 882 htifMid

Meitinc; 1 emae n re, ^:;T 329 DSC

Optical

Gloss M) 85 ASTM D24S?

(0032 f n anot er embodiment, the polypropylene may be & polypropylene heiemphnsle copolymer (PPHC; e ei a polypropylene hornopolyrner phase or component is j k d to a copolymer phase or component The PPBC ma have from greater than 6.5% to less ihao H.5% by weight ethylene, alternatively from 8.5% to less than 10,5%, alternatively from 9.5% ethylene based on the total weight of the PFB^'C. Herein, percentages of a component refer to the percent by weight of thai c m onent, in the total, composition unless otherwise noted,

|0O33) The copolymer phase of a PFHC may be a random copolymer of propylene and ethylene, also referred to as an ethylene/propylene robber (EPR;. PP impact copolymers show distinct hornopolyrner phases thai are interrupted by short sequences or blocks having a random arrangement of ethylene and propylene, in comparison to random, copolymers, the block segments comprising the EPR may have certain polymeric characteristics (e.g., intrinsic viscosity) that differ from that of the copolymer as a whole, In an. embodiment, the EPR portion of the PFHC includes greater than 14 vet.% of the PPPJC, alternatively greater vhan 18 wt.% of the PPHC, alternatively from 1 wt.% to I d wt.% of the PPI !⁽

10034] The amount of ethy lene present in the EPR portion of the PPHC; may be from 38 wt.% to 50 wt.%, alternatively from 40 wp% to 45 wt,% based on the total weight ot the Ii.FR portion. The amount of ethylene present in. the EPR portion of the PPHC may be determined spec trophotometric ally using a Fourier transtbrrn infered spectroscopy (FUR) method. Specifically, the FO R sp cirum of a polymeric sample is recorded for a series of samples having a known EPR. ethylene content. The ratio ofttansmittance at 720 em^' V900em^'; is calculated tor each ethylene concen radon and a calibration curve may then, be constructed. linear regression analysis on the calibration curve can then be carried out to derive w equation that is then used to determine the EPR ethylene content for a .s mple material.

f (MBS The EPR portion of the PPHC may exhibi an intrinsic viscosity different from that of the propylene honmpolyme-r component. Herein intrinsic viscosity infe s to the capability of a polyruer in solution to increase the viscosity of said solution. Viscosity is defined herein as ie resistance to flow doe to interna! friction. In an embodiment, the hrtrinsie viscosity of the EPR portion of the PPHC ma he greater than 2.0 dJ/g_s alternatively from 2.0 di/g to 3.0 dl/g, alternatively from 2.4 di/g to 3,0 dl/g, alternatively from 2.4 dl/g to 2.7 dl/g, alternatively from 2.6 d)/g to 2.8 dl/g. The intrinsic viscosity of the EPR portion of the PPHC is determined in accordance with AST 1)5225.

[tW \ In an embodiment, the PPHC may have a melt flow rate (MFR) of from 05 g/10 min. to 130 g 10 mhm alternatively from 70 g/10 mm. to 120 g/10 mill, alternatively from 70 g/| 0 min. to 100 g/10 min., alternatively from 70 g/10 min. to 90 g/ 1 min., alternatively from 75 g/10 min. to 85 g/ 10 min., alternatively 90 g/10 min. Excellent, flow properties as indicated by a high MFR allow lor high th.nmg.hput manufacturing of molded polymeric components, in an embodiment the PPBC Is a reactor grade resin without modiiicauon, which may also he termed a low order PP, In some embodiments, the PPHC is a controlled rheology grade resin, wherein the melt flow rate has been adjusted by various techniques such as visbreaking. For example, MFR may he increased by visbreaking as described In IIS. Patent No. 6,503,990, which, is incorporated by reference m its entirety. As described in that publication, quantities of peroxide are mixed with polymer resin in Hake, powder, or pellet form to increase the MFR. of the resin. MFR as defined herein refers to the quantity of a. melted polymer resin that will How through an orifice at a specified temperature and under a specified loud. The MFR may be determined using a dead-weight piston Piastometer that extrudes polypropylene through an orifice of specified dimensions at a temperature of 230 ^'SC and a load of 2.16 kg in accordance with ASTM D1238.

flMB?j Representative examples of suitable FPHCs Include without limitation grades 4920W and 4920WZ, which are Impact copolymer resins commercially available from Total Petrochemicals USA inc. in an embodiment, the ffttC ie,g,₅ grade 4920W) faas generally the physical properties sei forth in Table 3.

|^'0O38| In an embodiment, the polypropylene may also contain additives to imparl desired physical properties, such as printabiiiiy, increased gloss, or a reduced blocking tendency. Examples of additives include without limitation stabilizers, ultra-violet screening agents, oxidants, anti-ox ic fs, anthsmtle agents, ultraviolet light absorbents, Ike mardams, processing oik, mold release agents., coloring agents, pigments/dyes, fillers, and/or other additives known to one skilled in the art. The aforementioned additives may he used either singularly or in combination to form various ionizations of the polymer. For example, stabili ers or stabilization agents may be employed to help protect the polymer resin from degradation due to exnosore to excessive temperatures and/or ultraviolet light These additives may be included in aoionnis effective to impart the desired properties. Effective additive amounts and processes for inclusion of these additives to polymeric compositions may b determined by one skilled in the an. with the aid of th s disclosure.

{8039) The polypropylene for oPP Mm may be repared usin any suitable catalyst lo n to one or ordinary skill in th art. For example, the polypropylene may be prepared using a Ziegier- Natia catalyst.

f iMO] In an. emkKliment, the polypropylene Is prepared using Ziegier-Natta catalysts, which are typically based on titanium and. organometaliic alum num compounds, for example triedt laJiu mourn (C¾¾)„¾Ai.. Ziegier-Natta catalysts and processes tor forming such catalysts are town in the art and examples of such are described in U.S. Patent. Nos. 4,298,718; 4,544,? } /; and 4,767,73s, each of which is incorporated by reference herein,

$041) The polypropylene may be formed by placing propylene alone in a suitable reaction vessel in the presence of a catalyst (e.g., Zicgier- atta) and under suitable reaction conditions tor polymerization thereof. Standard equipment, arid processes for polymerizing the propylene info a polymer am known to one skilled in the an. Such, processes ma include solution, phase, gas phase, slurry phase, bulk phase, high pressure processes or combinations thereof^' Suets, processes are described in detail in U.S. Patent Nos. 5,525,678; 6,420,580; 6,380,328; 6.359,072; 6,346,586, 6,340.730; 6,339.134; 6.300,436: 6,274,684; 6,271,323; 6,241845; 6,245,868: 6,245,705; 6,242,545; 6,21 1 ,105; 6,207,606; 6,180,735; and 6.147, 173, which are incorporated herein by reference in their entirety.

f^'0042f an embodiment, me polypropylene is formed b a gas pbase polymerization process. One example of gas phase polymerization process includes a continuous cycle sy stem, wherein a cycling gas stream (otherwise known as a. recycle stream or tluidizing medium) is heated to a reactor by heat of polymerization. The eat is remo ved f om the cycling gas stream in a other part of the cycle by a cooling system external to the reactor. The cycling gas stream containing one or more monomers may bo continuously cycled through a i di¾ed bee! the presence of a catalyst under reactive conditions. The cycling gas stream is generally withdrawn from the fhudized bed and recycled back into the reactor. Simultaneously, polymer product may be withdrawn from the reactor and fresh monomer may be added to replace the polymerized monomer. The reactor pressure in a gas phase process may vary I om about 100 psig to about 500 psig, or Irom about 200 psig to about 400 psig, or from about 250 psig to about 350 psig, ^'The reactor temperature in a gas phase process may vary irom about 30 *C to about 120 °C, or Irom about 60 °C to about 1 15 °C. or from about 70 *€ to about 1 10 , or irom a ottt 7 ^¾C to about 95 for example U.S, Patent os, 4/543,390· 4,588,790; 5,028,670; 17, 36 5,352,749; 5,405,922; 5,436,304: 5,450,471 ; 5,462,999; 5,616,66! ; 5.627,242; 5.665,818; 5,677375; and 5,668,228. which are eorporated herein by reference in their entirety,

f K)43) In an embodiment, the polypropylene is formed by a slurry phase polymerization process. Slurry phase processes generally include forming a suspension of solid, particulate polymer in a liquid polymerization medium, to which monomers and optionally hydrogen, along with catalyst, are added. The suspension (which may include diluents) may be intermittently or continuously removed from the reactor where the volatile components can be separated i m the polymer and recycled, optionally after a distillation, to the reactor. The liquefied dilue t employed in the polymerization medium may include a C¾ to C_? a!kane (e.g„ hex arte or isobutene}. The medium employed is generally liquid under the conditions of polymerisation and relatively inert. A bulk phase process Is similar to that of a slurr process. However, a process may be a bulk process, a slurry process or a hulk slurry process. |0Θ44] In an ?mbodim«nt. the BPF includes metaiioeene-eatalyzed polyprop lene (mPP) film layer (i.e., a film layer comprising polypropylene produced using a me iliocene catalyst)- The mPP may be a homopoly er or a copolymer, lor example a copolymer of propylene with one or more -alpha olefin monomers such as ethylene, butene, hexene, etc, In an embodiment, the mPP film includes a ineutiloeene-caialyxed random euh lene-pnmyiene iC C_. copolymer (mREPC) a d may include of front 2 wt% to 1:0 wt.% ethylene, alternatively from 3 m.% io 9 vv ethylene, alternatively Irom 4 vA.% to 8 ,% ethylene. The mPP film layer may have a seal initiation temperature (SIT^"} of from WJ *C m 130 °C_} alternatively from 95 C ιο 125 ^;:C. alternatively -from 90 ^¾C to 120 . Herein the SIT refers to the minimum seals rig temperature required to form a seal of significant: strength, which varies depending cm the applications. Further,: a mPP suitable for use in this disclosure may he characterised by a number average molecular weight Mix ut^" from 52x10^'* to 9.3x 10^'; akemativel irom 5.8x10 to 8,6K 10*. alternatively from 6.5 1 (P to 7,9x 10* a weight average molecular weight of from L6^"/ l O^"3 to 2.20 1 Of, alternatively irom I .TSxl O⁵ to 2. 1 !x [{ _; alternatively irom 1 .84x 1.0^s to 2.02x 1 i ; a polydispersity index Of irom 2.1 to 3.3 , alternatively irom 2.3 o 3.1 , aitemaiive!y from 2,5 to 2,9; and a z-average molecular weight of trom 2.98x10* to 4,22x10; alternatively from 3.19x10 to 4.01 x 10; alternatively fr 3. 0x l (f to 3J i xHf;

f 045j hi ethylene-propylene random copolymers, the ethylene molecules are inserted randomly into the polymer backbone between repeating propylene molecules, hence the term ra do copolymer. In the preparation of a ral BPC a certain amount of amorphous polymer is produced. This amorphous or atactic polymer is soluble in xylene -and is thus termed the xylene soluble fraction or percent xylene solubles (XS%). in determining XS%. the polymer is dissolved m hot xylene arid then he solution is cooled to (PC which results in the precipitation of the isoiaciie or crystalline portion of the polymer. The XS% is that portion of the original amount that remained soluble in the cold xylene. CoRsequeirtly, ihe XS%

the polymer further Indicative of the extent of crystalline polymer formed, in m e bodiment, the ilEPC has a xylene soluble traction of f m 0.1% to 6.(1%; alternatively from 0.2% to 2.0%: .and altenratrvely from 0.3% 1.0%. as determined in accordance with ASTM D 5492-98.

I 6] In. m embodiment, an m EPC suitable for use in this disclosure may bas e density of from 0.S90 g/ec to 0.920 g/cc, alternatively from 0.895 g/cc to 0.915 g/ce, and alternatively from. 0.900g/ce to 0.91.0 g/cc as determined in accordance with ASTM D-1505. In an emhodbueni, an mREPC suitable for use in this disclosure may have a melt flo rate of from 0,5 /10miu. to 2000 g 10mm._; altemadvely from 1 g/IOtmm to 1000 g lOrnia, and alternatively from 10 g/lOnun. to 500 g 10mm„ as determined in accordance with ASTM D- I 23S condition "L." In an m di ent, a film prepared limn m\ mREPC suitable for use in this disclosure may have a gloss at 45* of from 70 to 95, alternatively from ?§ to 90, and alternatively from 80 to 90 as detemhn in accordance with ASTM 1T-2457,

\i)iH^'7\ Art example of a suitable RBPC suitable tor use in this disclosure includes without limitation, a tnetallooene catalyzed ethylene-propylene random copolymer known as grade HOD 02-05 available from Total Petrochemicals USA, inc. In an embodiment, the mREPC (e.g., grade EOD 02 5) generally has the physical properties set forth i Table 4,

Table 4

Seal condition; di ensure 60 ; > ( ! 3 kPa> dwell drae 1.0 se

(08481 mPP hornopolytners may be formed by placing propylene in a suitabl reaction vessel in tbe presence of a metallocene catalyst and/or optionally additives arid under suitable reaction, conditions for polymerization thereof

(0049J mPP copolymers (i.e., niREPC) .may be formed, by placi g propylene in combination with a co-monomer (eg,, ethylene) in a suitable reaction vessel m the presence o a metailoeerse catalyst: and/or optionally additives and under suitable taction, conditions lor polymerialion thereof, Preparation of mPPs (i.e., m!lEPCs) are described in further detail In U.S< Patent os. 5, 158,920, 5,416,2282 5,289,502, 5,807,800, 5,9618-64, 6,225,251, and 6,432,860, each of which is incorporated herein by reference in its entirety.

j!HIS j In an embodiment, a method of preparing a BPF includes preparing an oFP film and contacting an mPP film with the oPP film to form a multi-layer Mm (e.g., a hilayer i¾m). In such an embodiment, tbe oPP film may be prepared by first melting the polypropylene in an extruder. Next, the molten polypropylene is extruded through a slot or a die to form a thin extruded polypropylene film. The extruded polypropylene film is then adhered to a cooled .surface, such as a chili roll that may be in contact with a water hath. The chili roil functions to immediately quench the film. The polypropylene film may then be passed through rollers designed to stretch the film in one direction to produce a utiiaxially oriented polypropylene Mm, alternatively m differi g axial directions to produce biaxially oriented polypropylene tie,, BOPP) films. The uniaxjally or biaxially oriented Mm. (collectively referred to herein as oPP film) may be further trimmed ami- roiled for transport or storage. In an embodiment, the oPP film has a thickness of from 0. i mil to 20 mil aHematively from 0.25 mil to 20 mil, alternatively from 0.30 rod to 20 mil

O SIj & sense embodiments, the oPP f lm may be subjected io a surface modification process designed > increase the surface tension of the film. Examples of s rface modif cation processes include without Imitation corona treatment flame treatment and plasma treatment, Corona treatment is an electrical process that uses Ionized air to increase the surface tension of nonporous substrates. Flame treatment is a process of burning away surface contaminants by -forcibly spraying a flame onto a substrate,. Plasma treatment is a process of creating plasma in n inert g s to increase surface energy and wetting ability of a substrate. In an embodiment, the oPP film of this disclosure is subjected to corona treatment fol lowin extrusion. Methods and conditions lor corona treatment of an oPP film are known to cue of ordinary skill in the art with toe aid of this disclosure.

\M\52\ Examples of suitable oPP films include without limkaii n TAFEPIE 11120 and TAPEFILM ΊΉ30 which are oPP tape films commercially available from OppFihn Fa!ls giotu FA. in an embodiment, the oPP fil s (e.g., TAPEFILM TH20, TAPEFILM 11130 > have generally the physical properties set forth in Table 5.

f able 5

Tensile m¾nat Ml), Mmnl 150 D S

sv Ctt a ;:;asi>;: ->u;;.: at ^' t ^*. i 18 16 0 00 3] Alitor, the oPP film is pre ared, the method of preparing a. PP may further include extrusion coating a; 5 raPP layer onto the oPP him layer. Figure 1. is a schematic diagram of an extrusion coating apparatus 1 0 for use in the p ocess of preparing a BPP. Referring to Figure i , the process may he earned out by providing an oPP, which is usually in the iorm of a rolled oPP film 1 10. The rolled oPP Mm 110 is unwound using an unwinder 105 where an unrolled oFP Mm 1 .15 k guided using guide rollers 1.20 and 125 toward a nip roller 130. Next, an mPP 140 is melted and extruded through a die 1 55 at a temperature of from 420 ^: to 530 ^'X , aheroattvely tfonrOOO °F to 520 °F, alternatively from- 400 *P to 510 ^<\ The extruded mPP 140 is then l id onto (i.e., contacted with) the unrolled oPP film 115 at a nip 1 SO. Contacting^' of the mPP 140 and the oPP film 1 10 at nip 150 at. adequate pressure causes the mPP 140 to adhere to the oPP film 1 15 to hum a BPP 155. In an embodiment, the apparatus is configured such that the pressure applied may be adjusted to meet a process-desired need. The EPF 155 is then passed onto a cooling cylinder such as chilled .mil 145, and guided with guide roller 100 towards rollers 165. From rollers 105, the BPF 155 is wound using winder 170 and collected s a rolled BPP film 175.

|0 54| The oPP Film layer may have a thickness of from 0.1 rail to 20 mil. alternatively Item 0.25 mil to 20 mil, alternatively from 0.3 mil to 20 mil. The mPP film layer may have a thickness of irom 0.1 mil to 20 rail alternatively irom 0.25 mil. to 20 mil, alternatively from 0.3 mil to 20 mil In such evmOodi merits, the resultant BPF having an oPP !ilm layer and a mPP film layer has a thickness of fr m 0,2 mil to 20 mil. alternatively from 0.25 mil. t 20 mil, alternatively from 0.3 mil to 20 mil

| 5Sf In an embodiment, a BPF of the type described herein may ioeh.de m oPP, an mPP and a tie layer. Alternatively the BPF does not include a tie layer. Tie layers are adhesive la ers that a e typically added to improve the adhesion between two materials.

fC!tSoj The BPF comprising an mPP f lm layer and m oPP film layer of the type described herein may have display a number of desirable physical and/or optical properties. In an embodiment, the BPFs of the type described herein have a haze percentage of from 0.5 % to 10 %_> or from 1 % to 9 %_f or from 1.5 % to 7 %. Haze s the cloudy appearance of a material, caused by light scattered from within the material or from its surface. The haze of a material can be determined m accordance with ASTM D 10034⁾0 for a aze percentage of equal to or lower than 0%. Λ material having a haze percentage of greater than 30% can be determined in accordance with A SI M 0 67.

|0OS7j In an embodiment BFPs of the type described herein may have a gloss 45" of from 60 to 00, or from 6Ί to 98, or from 62 to 95, The gloss of a material is based on. the interaction of light with the surface of a material more specifically the abiiity of the surface to reflect light in a specular direction. Gloss is measured by measuring the degree of gloss as a function of the angle oi the incident light, tor example at 45* incident angle (also known as "gloss 45^0> and may be determined in accordance with ASTM D2457,

|0 58) in an embodiment, a BPF of the type described herein may he used in thenno- laminauon applications to form laminates. In such, an embodiment, the BPF may be applied to a substrate, wherein the mPP film layer is disposed between the oPP film layer and the substrate, and then heated to form a laminate. The substrate may include any suitable substrate such as paper. plastic, metal, wood, fabric, lass, or combinations thereof; in ilvermrMatniaadors applications, tbe mPP Sim layer of the BPF m function, s a heat seal layer.

f^' H>59] In an embodiment, a laminate is formed which has a substrate, an^' mPP film layer and an oPP film layer of the type described herein. In an embedment, the laminate includes less than i wt.% EV A, ahemavively less than 0.5, 0.1, 0.01, 0.00] or 0.00! wi.% EV A, Alternatively, t e laminate is substantially tree of EV A,

| 6θ] The laminate including a BPF having an mPP film layer and an oPP film layer of the type described herein m y display desirable mechanical properties. In an embodiment, the laminate .m y exhibit an adhesive strength of from 0, 1 Ibv io 10 Ibr alternatively ixorn 0.25 lb.: to 9 lbs alternatively fiorn 0.5 ¾ to 7 Ibf based on a IS " pee! strength test,

10061] Figures 2A and 2B illustrate a 1 W peel strength teal 200, Referring to Figure 2A, the tesi 200 is carried oat by contacting a BPF 205 comprising an oPP film la er 21 and an mPF film layer 215 with a substrate such as a bond paper 220 w here in the raPP film layer 215 of the BPF 205 is facing the bond paper 220, Next, two heated bars 225 are pressed (arrows 230} onto the BPF 205 and the bond paper 220 at a temperature of 90 ^C>C .for one second. Referring now i.o Figure 2B, the heated bars 225 are then removed (arrows 235} and a laminate 240 is termed. The larmnate 240 is cooled tor one minute. Next, the BPF 205 is peeled off from Ore bond, paper 220 by applying two opposing .forces 245. Any suitable tensile teste unit such as a 5500K Model 1122 commercially available from 1NSTR0N may be_. used to conduct the peel strength experiment. |0 62f The BP1¾ of this disclosure may be converted to various end-use articles. Examples of end use articles into which the BPFs of this disclosure may be formed include laminates (tor packaging, printed papers, etc.), laminate flooring compositions, polymeric foaxn subsmne deeorative surfaces (e.g., crown molding, etc.), weatherabie outdoor materials, poini-ohpurchase

a a signs and displays, housewares md consume? goods, cosmetics packaging, outdoor re lacement materials, lids md containers (le.,_. for deli, trait candies and cookies), appliances, utensils, and the l ke,

EXAMPLES

|$H>3| Il e disclosure having been generally described, he following examples arc given as particular embodimen s of the disclosure and to demonstrate Ike practice and advantages, thereof, ft is understood that the examples are given by ay of illustration and arc not intended to limit the specification or die cla ms to follow in any manner.

EXAMPLE I

[ KI64| The strength of adhesion tor a 8PF comprising an raPP turn layer and a BOPP film layer produced at 440 ^¾P was investigated. A EPF sample, designated Sample 1 _? was prepared. The BOPP film used was a corona treated BOPP tlira from OppFi!rm Lima. Peru, The mPP used was B D02-I 5, which is an mPP wit an SIT of 105 °C available from Total !¾roohemieals USA, Inc. No tie layer was used between the mPP and BOPP trim.

\iHH 5\ lite sample was produced by extrusion coatin an m.PP layer onto Ihe BOPP film using a laboratory extruder as described previously with reference to Figure I , The details oi processing parameters including temperatures, pressures, die gap, and screw speed lor all samples are tabulated m Table 6. ^";¾e thickness of the mPP film was adjusted by adjusting the line speed resulting in an mPP layer that was appro mately Imi] (25pm.) thick. The final EPF thickness was 2.0 mil (50 am). Table 6

fOOM The adhesion strength of Sample 1 was determined by rneasurmg ihe 180° eel force as discussed previously herein, with reference to Figure 2. The experiment wa repealed six times. Figure 3 sho ws ihe 180* peel force as a function of extension.

EXAMPLE 2

{(mi} The strength of adhesion between au rnPP layer and a BOFP layer of a BPF produced at 500 ^'-ψ was investigated. A bi-layer film sample, des gnated Sample 2, was prepared. The component materials and method of producing the bilayer him were described in Example 1 . The details of processing parameters including temperatures, pressures, die gap, and screw speed for all samples are tabulated in Table 7, Use thickness of the rnPP film was adjusted by adjusti ng the line speed resulting an rnPP layer thai was approximately I mil (2Sp ) thick. The final BPF dilckness was 2 md. Table ?

£0O68j The adhesive strength of Sam le 2 was determined by measuring the I SO* peel three and the experiment was repeated six times. Figure 4 shows the 180° peel force s a function of extension,

f0O69J The results demonstrated that the I SO⁰ peel forces were higher for Sample 2 when, compared to Sample 1 from Example L The results suggest, that EOIX)2-d S has a greater adhesive strength when eoated at 500°F instead of 440^'SF as shown, in. Example 1.

EXAMPLE 3

\m The strength of adhesion between an mPP and a BOPP of a BPP produced at 44C f was investigated using an mPP having a lower SIT. A bi-iayer film sample, designated Satnpse 3. was prepared. The BOPP used was that described in Example 1 a d the mPP was EOD0/--21 , which k an. mPP with a SIT of 98 ^;:C available from Total Petrochemicals USA. inc. The details of process n aram te s mcJyding temperatures, pressures, die gap. and screw speed for Sam l are tabulated 1st Tabic d. The thickness of the mPP film was adjusted by adjusting ihe line speed so resulting in an mPP layer that was approximately imsl (25prn) thick. The final BPF thickness was 2.0 mil.

T^'be dhes strength of Sample 3 was determined by measuring the I 80^<; el force and the ex riment was repealed five r mes. Figure 5 shows the 110'' peel toree as a function of extension. The results demonstrated that the 180* peel forces were higher for Sample 3 when compared to Sample 1 from Example 1.

EXAMPLE 4

|0 72| A hhlayer -fifra s m le, designated Sam le 4, was prepared. The BOPP and the mPP used were similar te those used Example 3. The biiayer films (approximately I m l thick) were produced using procedures similar to those described in Example I . The details of processing parameters including te eratures, pressures, die gap, and screw speed were similar to Example 2 winch are tabulated m Table 7.

[0073} Sample 4 w tested for the adhesion by measuring the 180" peel tome and the experiment was repeated 7 times. Figure 6 shows the I SO pee! force as a function of extension. The results demonstrate diat the 180^:' peel forces were lower for Sample 4 when compared to Sample 2 irons Example 2. The results were surprising since EOD07-21 has a lower SIT than KOD02-1 S. In addition, the increase in peel force trend observed by increasing the processing temperature from 440 *F ιο 500 ° as shown in Examples 1 and 2 was not observed tor Examples 3 and 4.

EXAMPLE 5

f^'0 74j The haze and gloss of Samples 1-4 from Examples 1 were determined. The results are tabulated in Table 8. Table 8

O ?5| The results demonstrated (hat significantly clear and glossy film structures can be produced with either BOD02 5 or EOD07-21.

EXAMPLE 6

fiM)? ) The average ISO* peel force ibr Samples 1-4 from Examples i -4 were determined. ^'The results are shown m Figure 7. which, is a plot of average 180° peel force as a ilmetion of extension, Referriiig to Figure 7, EOD02-15 extrusion coated at 500 (Sample 2) shows a higher average 180" peel force than the other samples, which suggests thai EOD02G extrusion coated at 500 ^»F had higher adhesion strength to BOPP films,

EXAMPLE 7

Films comprising a BOPP layer and an EVA coaling with differing tie layers were prepared .and the adhesion, of the BOPP and EVA compared. Four films, designated Samples 3-8, were prepared risin EOD05-07 a the base resin. EOD 05-07 i a. polypropylene resin commercially available from Total Petrochemicals USA, Inc. Sample 5 included the BOPP turn and a tie layer having a corona treated Base!I 7432 resin. Basel! 7432 is an ethylers:;4>uryiene~ propylene ierpolyiner layer commercially available from Baseil Service Co, The Netherlands. Sample 6 had the BOPP film and a tie layer including a corona treated HLDPE FIBS SC35 resin. H.LPPB f 035 SC35 is a medium, density polyethylene layer commercially available from. Braskenp Brazil. Sample 7 had a corona treated BOPP film without a tie layer. Sample $ had a BOPP Slim and a tie layer including a corona treated Basel! 741 . Baseil 7416 is ¾n ethylene

' 7 propylene copolymer layer, contn.iorci.ally available from Basdl Service Co, The Netherlands, The thickness of the BOPP films was 0,0010 in. The surface tension of the eorona^reated side of all samples wa measured using AecuDyne l est Ink and the results are tabulated in Table 9,

l abie 9

Surface Tension (dvne/cm)

\WI\ Next, Samples S-S were extrusion coated with, a Imil p-25pm) thick EVA layer to form Samples * -12 using a similar procedure described previously. The EVA was ELV^'AX 460 resin, which k a con mercialiy available 18% vinyl acetate EVA resin irons. DuPom, North. America. The details of processing parameters including temperatures, pressures, die gap, and screw speed !br all samples arc tabulated in Table 10.

Table 10

Take-o top roi {«ntperature 5 ^: ¾)79| Paper separators were manually attached to the BOPP Mm at regula intervals upstream of the extrusion die durin the coating process to provide separation points between the EVA co ng a.nd the BOPF film. The 180° pee! tests were conducted on Samples 942 arsd were repeated between 5-8 times. The results ibr Samples 9-12 are shown in Figures 8-1 1 respectively, figure 1 shows the average 1 SO peel force -as a function of extension tor Samples 9-1 .

1OO8 The results demonstrate thai EVA adheres strongly to the BOFP dim comprising a corona treated ethylene propylene copolymer tie layer (Sample 12) and poorly to the corona treated BOPF homo-polymer (Sample 1 1 ). The results further demonstrate thai a mPP of the type described herein (e.g.,. EOD02-1 S) exhibits increased adhesion to a corona treated BOPP surface than an 18% EVA material. The clarity and low melting point of an MPP of the type described herein could prove highl beneficial tor certain lamination applications. Fnnhennore, the simplicity of a bi-layer scalable material, when compare to a .in -layer EYA RCP/BOPP material, may also benetkiatly impact the costs associated wi th the production of laminates,

(0081] While various em diments have been shown and described, niodi ileal ions thereof can be made by one skilled In the art without departing from the spirit and teachings of the disclosure. The embodiments described herein are exemplary only, and are not intended to he limiting. Ma y variations and modifications of the subject matter disclosed herein are possible and are within the scope of the disclosure. Where numerical ranges or limitations arc expressly stated, such express ranges or limitations should be understood to Include iterative ranges or limitations of like magnitude failing ithin the expressly stated ranges or limitations (e.g,, from about 1 to about 10 includes, 2, 3. 4. etc; greater than Odd includes 0.1 L 0.12. 0. 13. etc). For example, whenever a numerical range with a lower limit. R , and an upper limit. R¾. is disclosed, any number falling within the range is specifically disclosed.. In particular, the following numbers within the range are specifically disclosed: R™R₅, fc* (R_v-R ), wherein k is a variable ranging -from, i percent to 100 percent with a 1 percent increment, i.e., k Is 1 percent 2 percent. 3 percent. 4 percent. 5 perce.nl ..-50 percent 51 percent, 52 percent, , 95 percent, 96 ercent, 97 percent, 9% percent, 9 percent, or 100 percent. M eo er- y numerical range d fined by two numbers as defined in the above Is also specifically disclosed. Use of the term "optionally" wkh respect io any element of a daim is intended io mean thai tbe subject element s mqorred, or alternatively, is not required. Both alternatives are intended to be within the scope of the daim. Use of broader terns such comprises, includes, having, etc. should be understood to provide support tor narrower term such as consisting of. consisting essentially oil comprised substantially of, etc. f 082| Accordingly, the scope of protection is not limited by the description set out above but is only limited b the claims which follow, thai scope including all equivalents of the subject maiter of the claims. Bach and every claim is incorporated into the specification a¾ an embodinieni of the present disclosure. Thus, the claims are a further description and are an addition to the embodiments of tbe present disclosure. The discussion of a refer nce is no an admission that it is prior art to the present disclosure, especially any reference that may have a publication date aft the priority date of this application. The disclosures of all patents, patent applications, and publications cited herein are hereby incorporated b reference, to the extent that the provide exemplary, procedural, or other details supplementary to those Set forth herein.

Claims

claimed is;

A method comprising:

f r in a bilayer polymer 83 m comprising an orient d polypropylene film and a me a!loeene-eataiyxed polypropylene film wherein the rnel llocene-eat lyxed polypropylene rllm has a seal initiation temperature of from 80 °C to 1 0 °C,

't he method of claim 1 wherein the metallocene-catalyml polypropylene film has a thickness of from 0,1 mil to 20 mil.

The method of claim 1 wherein the oriented polypropylene film comprises tmiaxialiy oriented polypropylene film, biaxiaily oriented polypropylene film, or c m inations thereof.

The method o f claim 1 wherein the oriented polypropylene film is corona treated.

The method of claim 1 wherein the oriented polypropylene film has a thickness of from 0.1 mil to 20 mil

The method of claim 1 wherein the bilayer polymer film ^'has an adhesi ve strength o from

The method of claim I wherein the bilayer polymer film has a gloss 45° of from 00 to 99. The method of claim 1 wherein the bilayer polymer film has a haze percentage of trom 0.5% to 10%.

The method -of claim 1 wherein the bilay er polymer film has a thickness of iron - 0.2 mil to 20 mil

The method of claim 1 wherein die fonning of the bilayer polymer film oeeurs at a temperature of from 420 ^;T- to 530 d^:.

1 1. The method of claim 1 wherein She ionmng of the bi!ayer polymer film occurs by extrusion coating the met l locene- catalysed polypropylene film onto the biaxially oriented pol ypropy!en film,

12. The met od of claim 1 further comprising:

tkemi lamk in the bilayer polymer film with a substrate to form a laminate wherein the nretaik?eene-caialy¾:ed polypropylene film is disposed between the biaxially oriented pol propylene film and the substrate.

1.3. The method of claim 12 wherein the substrate comprises paper, plastic, metal wood, iabrie. glass or combinations thereof

14. The met od of claim 12 wherein the laminate is substantially free of ethylene- vmyhaeciate.

15. The method of claim I wherein the oriented polypropylene film is subjected to a surface mod faeation process.

I b. An article produced by the method of claim 1.

17, A laminate comprising:

a biasially oriented polypropylene film,

a metaliocene-eatidyzed polypropylene film, and

a substrate,

wherein, the mstaiiocene-cataiyzed polypropylene film Is disposed between the biaxially oriented polypropylene film, and the substrate.

18. The laminate of claim 1 7 wherein the metalloceoe-eatalyzed polypropylene film has a seal initiation temperature of ifom 80 °C to 130 ^¾ C.

19.. The lannaate of claim 17 wherein the laminate is substantially free of ethyleue-vinyh aeeiaie. The method of claim 1 ? wherein the biaxiaily oriented polypropylene film h subjected te- a. surface mod fication process.