JPS5945150A - Method of forming sealant web-pvdc-base film laminate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a sealant web made of polyvinylidene chloride (P
VDC) - relates to heat lamination to coated base films.

The laminate of base film and sealant web with PVDC coating is
Useful in packaging food products such as bacon, sausages and cheese. Examples of base films are nylon films, polyester films and polypropylene films, and examples of sealant webs are polypropylene. Typically, such laminates combine the sealant web with a PVDC coated base film.
DC coatings are produced by laminating, so-called adhesive lamination. Usually, in this adhesive lamination method, the adhesive dissolved in a solvent is
Spread on the VDC coating and evaporate the solvent to make the adhesive tacky. The sealant web is then pressure laminated to the viscous adhesive coated PVDC. The adhesive is usually a urethane adhesive. Such urethanes can be dissolved in volatile organic solvents such as acetone, ethyl acetate or toluene.

Adhesive lamination of sealant webs to PVDC coatings has several drawbacks. One drawback relates to the use of volatile organic solvents, which have a high tendency to burn, are expensive and are not easily recoverable. Therefore, from a safety standpoint, it is desirable to use water-based adhesives or adhesive-free methods. Other drawbacks are
Concerning the types of PVDC that can be used. In order to prevent PVI)C from being attacked by the solvents used in the adhesive lamination process, crystalline PVDC must be used. However, crystalline p V D C
generally do not adhere well to the aforementioned base films, and it is usually necessary to bond the crystalline PVDC to the base film with a primer. For example, amorphous PV
DC Brymer, Canada No. 391,235 (T,
J.

Nylon films can be used to adhere to crystalline PVDC, as taught in J.D. Lang, filed December 1981).

Two sheets with I'VDC sandwiched between them -117
= Another approach to producing laminates of plastic films is to coat one of the plastic films with a so-called PVDC barrier and then heat-laminate the second film with a barrier adhesive. Barrier adhesives are available for coating oriented polypropylene films, medium density polyethylene (soundness of about 0.935-0.945 g/am3), nitrocellulose-coated regenerated cellulose, and nylon films. Such/Heller adhesives are said to be heat laminable to low density polyethylene films. however,
Bonding using so-called slip-modified low-density polyethylene films, i.e. low-density polyethylene films containing a slip-lump adhesive, yields only about 10-20 g as determined in a 5uter™ tester.
/ cm was found. Commercially acceptable bond strengths are greater than about 100 g/cm.

The first sealant web and the base film are 18-ranali, the base film is a nylon film, an oriented polypropylene film, an oriented polyester film, or a second sealant web, and the base film has a PVDC layer between the first sealant web and the base film. laminates and methods of manufacturing laminates that do not rely on adhesive lamination methods and have commercially acceptable bond strengths,
It was discovered this time.

The present invention therefore provides a film laminate comprising a base film and a first sealant web with a PVDC coating sandwiched therebetween, the first sealant web comprising: a) a copolymer of ethylene and vinyl acetate; Film made from Oyobi b)
l) a copolymer of ethylene and vinyl acetate; and 2) a homopolymer of ethylene, or a copolymer of ethylene and one or more 04-C10 α-olefins, said homopolymer or copolymer having a polyolefin of from about 0.915 to about 0.
having a density of 955 g/cm'', or blends of said homopolymers and copolymers, said base film being an oriented nylon film, an oriented polyester film, an oriented polypropylene film. , a cast nylon film, and a second sealant web, said second sealant web being selected from the same group as said first sealant web, and having a diameter of about 0.4
has a lower slip coefficient, said PVDC coating consists of at least one layer,
said layer has a crystallinity of less than 1.15 when dried and left standing at 20° C. for 30 days, and when the base film is selected from nylon film, polyester film or polypropylene film, the layer in contact with the base film; is characterized by having a crystallinity of 1.12 to 1.25 when dried and left at 40°C for 5 days.

To provide a film laminate characterized by:

The present invention also provides a method for feeding the base film and the first sealant web together between a nip roll and a hot roll;
The PVDC coating is applied to at least a base film or a first sealant web, provided that when the first sealant web or the second sealant web is in contact with a hot roll, the web in contact with the hot roll has a has a slip coefficient of less than .4;
A method of forming a laminate of the present invention is provided, characterized in that:

In one embodiment, the method comprises: a) PVDC
b) heating the coated base film or first sealant web to an extent sufficient to reduce the crystallinity of the PVDC coating to less than about 1.05; b) heating the heated PVDC coated base 21- film or first sealant web; c) when using a PVDC coated base film, the first sealant web is in contact with the PVDC coating and between the nip roll and the heat roll;
The sealant web is sandwiched against a PVDC coated base film to form a laminate and the PVDC
When using a coated base film, the process consists of contacting the base film with the PVDC coated base film between a two-layer roll and a hot roll to form a laminate.

In another embodiment of this method, a PVDC coated base film first sealant web is taken and a further PVDC coating is applied to the base film or first sealant web, followed by heat lamination to form a laminate. Specific embodiments are hereinafter referred to as Methods A, B, C, and D.

Method A comprises: a) heating a PVDC-coated base film to an extent sufficient to reduce the crystallographic plane of the PVDC coating to less than about 1.05, and the PVDC is dried and
characterized by having a crystal face smaller than 1.15 when standing for 30 days at 0°C, and when the base film is selected from nylon film, polyester film or polypropylene film,
The PVDC coating is further characterized by having a crystal face of 1.12 to 1.25 when dried and left at 40°C for 5 days, b) converting the PVDC coated base film to aqueous PVDC
coating with a dispersion to form a second PVDC coating, the PVDC coating being dried and heated at 40°C.
C) drying and subsequent application of a second PVDC coating;
heating until the temperature of the free surface of said second coating is below 75° C.; d) passing the resulting PVDC coated base film over a hot roll, said base film being in contact with said hot roll; , said hot roll is at a temperature greater than about 70°C, and e) contacting a first sealant web with a second PVDC coating and applying said first sealant web to a PVDC coated base film between a nip roll and a hot roll. It consists of forming a laminate by sandwiching it between the two.

Method B comprises: a) heating a PVDC-coated base film to an extent sufficient to reduce the crystallographic plane of the PVDC coating to less than about 1.05, wherein the PVDC is dry and
characterized by having a crystal face smaller than 1.15 when standing for 30 Ei at 0°C, and the base film is selected from nylon film, polyester film or polypropylene film,
and the PVDC coating is further characterized by having crystallographic planes of 1.12 to 1.25 when dry and standing at 40° C. for 5 days, b) crystal planes having a surface tension of at least 42 dynes/cm 1 sealant web with an aqueous PVD C dispersion to form a PVDC-coated first sealant web, wherein the PVDC coating of the first sealant web"-- when dried and left to stand at 20'0 for 30 days, c) drying the PVDC coating on the first sealant web; d) passing the PVDC coated base film through a 25-roll roll; in contact with a roll, said heated roll being at a temperature greater than about 70°C; and e) a PVDC-coated first sealan I web.
PVD of PVDC coated base film on DC surface
The PVDC coated sealant web is PVD-coated between a nip roll and a hot roll in contact with the C surface.
It consists of forming a laminate by sandwiching it against a C-coated base film.

Method C comprises a) applying a PVDC coated first sealant web to an aqueous P
coating with a VDC dispersion to form a second PVDC coating, said second PVDC coating characterized by having a crystal face smaller than 1.15 when dried and left at 20° C. for 30 days; is selected from nylon film, polyester film or polypropylene film,
A second PVDC coating is further characterized by having a crystal dust content of 1.12 to 125 when dried and allowed to stand at 40°C for 5[1 min, and said PVDC coating adjacent to the first sealant web is dried And when left at 200C for 30 days, 1
．． b) drying the second PVDC coating;

C) passing a base film through a hot roll, said base film being in contact with said hot roll, said hot roll being at a temperature greater than about 70°C, and d) contacting said base film with a second PVDC coating. and sandwiching the base film against a PVDC coated first sealant web between a nip roll and a hot roll to form a laminate.

The method is as follows: a) The base film is coated with an aqueous PVDC solution, and the resulting coating is dried and left at 20°C for 30 minutes.

15 and the base film is selected from nylon film, polyester film or polypropylene film 1\, the PVDC coating is dried and heated at 40°C.
b) drying the PVDC coating; c) passing the PVDC coated base film through a heated roll; , the base film is in contact with the thermo roll, and the thermo roll is at a temperature greater than about 70°C, and d) a PvDC coated first sheet 77
Contacting the PVDC-coated surface of the i-web with the PVDC-coated surface of the PVDC-coated base film and sandwiching the PVDC-coated sealant web against the PVDC-coated base film between a nip roll and a hot roll to form a laminate. , consisting of.

In a further embodiment of this method, a base film or first sealant web is taken and the PVD
After applying the C-coating to the base film and/or first sealant web, a silicate is formed by heat lamination.

Method E includes: a) coating the base film with a first PVDc;
The coating is characterized by having a crystalline dust of less than 1.15 when dried and left to stand for 30 E1 at 20°C, and when the base film is selected from a nylon film, a polyester film or a polypropylene film. , the PVDC coating is dried and 4
0'C! When left standing for 5 days, 1.12 to 1.
Further characterized by having 25 crystalline dust.

b) '-1- Coating the PVDC-coated base film formed in step a) with a second PVDC to form a second coating, which when dried and left at 20°C for 30 days, .15
c) heating said second coating until the temperature of the free surface of said second coating is below 75°C; and d) heating the resulting PVDC coated paste film. passing the sealant web over a second PV roll, the base film being in contact with the heat roll, and the heat roll being at a temperature greater than about 70°C;
sandwiching the sealant web against a PVDC coated base film in contact with a DC coating and between a nip roll and a hot roll 30 to form a laminate.

Direction/IIr F is.

a) Coating a first sealant web with a first PVDC having a surface tension of at least 38 dynes/cm to form a first PVDC coating, the coating having a surface tension of 1.15 when dried and left at 20°C for 30 days; b) coating the PVDC-coated first sealant web formed in step a) with a second PVDC, and allowing the second coating to dry and stand for 30 days at 20°C; the second PVDC is characterized by observing crystal dust smaller than 1.15 when
The coating has a crystalline dust of less than 1.15 when dried and left at 200C for 5F4, and has a crystalline dust of less than 1.15 when dried and left at 40C for 5F4.
C) passing a base film over a hot roll, said base film being in contact with said hot roll, and said hot roll having a grain size of about 70' c) the PVDC formed in steps a) and d);
The PVDC coated surface of the coated first sealant web is brought into contact with the base film and the PVDC coated first sealant web is sandwiched against the base film between a nip roll and a hot roll to form a laminate.

Method G includes: a) coating the base film with a first PVDc;
The first PVDc coating is characterized by having a crystal dust smaller than 1.15 when dried and stored at 20° C. for 30 H, and the base film is selected from nylon film, polyester film or polypropylene film. When dried and left at 40°C for 5 days, 16
b) drying the first PVDC coating; and c) a surface tension of at least 42 dynes/cm? d) a first sealant web having a second PVDC coating, the coating being characterized by having a crystalline dust of less than 1.15 when dried and left for 30 days at 20°C; d) a second PVDC coating; drying, e) passing a base film over a hot roll, said base film being in contact with said hot roll, said hot roll being at an angle of about 70°;
and e) PVD of the PVDC-coated first sealant web.
C surface is PVDC coated base film PVDC
The PVDC coated sealant web is heated between a nip roll and a hot roll before being brought into contact with the surface.
It consists of forming a laminate by sandwiching it against a coated base film.

In a preferred embodiment of the method of the invention, the PVDC layer in contact with the base film and the PVDC layer furthest from the base film are combined into a single layer, and said PVDC
The layer is dry and has a crystalline dust of less than 1.15 when left for 30 days at 20'O
1.12 to 1.25 when left at 0°C for 5 days
It is further characterized by having crystalline dust.

In another embodiment, when the base film is a Kya 34-Nut nylon film, the PVDC coating, i.e., the layer containing the sealant web, which is far from the base film is dried and left at 20 °C for 30 EI. is characterized by having a crystallinity of less than 1.05.

In a particularly preferred embodiment, the first sealant web comprises a) a copolymer of ethyl 1/vinyl acetate;
and b) a copolymer of ethylene and vinyl acetate and (1
) a copolymer of ethylene and a C4-C10 alpha-olefin, said copolymer having a
(2) a homopolymer of ethylene, a blend with said homopolymer, or said homopolymer has a density of about 0.915 to about 0.955 g/cm3;
A preferred copolymer of ethylene and an alpha-olefin has a surface adjacent to the PVDC coating of a material selected from the group consisting of Blend 1" with at least one of the following, having a density of ethylene/ Butene
1. Ethylene/octene-1 and ethylene/butene-1
It is a 1/octene-1 copolymer.

Preferably, a copolymer of ethylene and vinyl acetate (E
VA) of vinyl acetate is from about 1.0 to about 20% by weight, and the weight ratio of the copolymer of ethylene and vinyl acetate to the homopolymer of ethylene, copolymer of ethylene, or blend of said copolymer and homopolymer is 2. :9
It is in the range of 8 to 50:50.

In other embodiments, the Sealan I web is about 1.0
EVA copolymer having a vinyl acetate content of ˜15% modification, and the sealan web contains a slip additive. The slip coefficient of the sealant web is
It is less than 0.4, especially less than 0.3, as determined by ASTM method D-1894.

In yet other embodiments, the surface of the sealant web adjacent to the PVDC coating is corona discharge treated to a level of 38-45 dynes/cm prior to lamination.

In another preferred embodiment, the base film is a nylon film, especially nylon-6, nylon-66
or a condensation copolymer of ε-caprolactam and hexamethylene diamine adipate (sometimes called nylon 6/66).

In a further preferred embodiment, the base film is a metal coated surface, said surface being between the base film and the PVDC coating. The coating is a metal foil or, for example, a vacuum deposited film.

In other embodiments, the base film is a copolymer of ethylene and vinyl acetate that is bonded to the carrier web and has a hynyl acetate content of 2 to 40% by weight. Preferably the carrier web is made from an ionomer.

In another embodiment, the base film has an aluminum-coated surface, said surface being sandwiched between the base film and the PVDC coating.

In still other embodiments, the PVDC layer is the first PVDC layer.
The intervening PVDC layer interposed between the C coating and the second PVDC coating is characterized by the ability to exhibit crystallinity, and the level of the intervening crystalline PVDC layer thus formed is characterized by the ability to exhibit crystallinity. such that it resists attack by organic solvents as determined by the haze test, said organic solvents having a
PVDC coatings with lower crystallinity can be dissolved. Examples of PVDC dispersions suitable for forming the intervening layer can be found under the trademark 5erfen411.

In the solvent haze test, the PVDC coating is dried and crystallized before being sprayed with an organic solvent. If the PVDC coating has developed sufficient crystallinity, the PVD38-C coating will not be affected by solvents.

However, when the crystallinity of the PVDC coating is insufficient, the solvent will cloud the appearance of the PVDC coating or dissolve a portion or all of the PVDC coating.

Crystallinity, as defined herein, is measured using infrared spectroscopy by obtaining an attenuated total internal reflection infrared spectrum of the coated film. Crystallinity is Per
Measurements can be made using a Kin Elmer(TM) 467 infrared spectrometer and a Wilks(TM) ATR-9 attenuated total internal reflection apparatus with germanium crystal sections at 45[deg.].

In this method, a rectangular film is placed on each side of a germanium crystal (ie, two rectangular films are used), with the PVDC coated side of the film facing the crystal. Set the reference beam attenuator to 85% at 1150 cm and set it to 950 cm.
Scan at ~l 150 cm-1. 1115c
m-', and at the peak, measure the background absorption A at 107107 O' and 1042 cm-'. Crystallinity is A and A1042
Dividing the difference of 1115 by A and A is 107
0 1115 Therefore, calculate.

The detailed description of the invention relates to coating and lamination of nylon base films. Techniques similar to those used for nylon films, particularly oriented nylon films, can be used for polyester and polypropylene base films. However, cast nylon film,
Particularly thin cast nylon films require tighter controls when coating with PVDC and laminating the PVDC coated nylon film to a sealant web due to the sensitivity of cast nylon films to moisture and heat. Base films made from sealant webs require a slip coefficient of less than about 0.4 to prevent the film from sticking to the hot roll.

The invention will now be described with reference to the accompanying drawings.

Referring to FIG. 1, a suitable apparatus consists of a first coating station IO1, a first dryer 11, a second coating station 12, a second dryer 13, and a nip roll assembly 14. The equipment for supplying the base film and sealant web and winding up the laminate is not shown.

The first coating station 10 includes a pan 34 holding a PVDC dispersion, a direct gravure roll 16, and
It consists of a nip roll 20 associated with a gravure roll 16. The second coating station 12 is similar to the first coating station IO and has a pan 35, a direct gravure roll 41-17 and a nip roll 21. Instead of direct gravure rolls 16 and 17 and associated nip rolls, Meyer™ rots, reverse gravure rolls, or other coating equipment can be used. PVD
When using equipment that subjects the C dispersion to relatively high shear, the PVDC dispersion is modified, for example with the addition of isopropyl alcohol, to minimize foaming.

The nip roll assembly 14 includes a lamination roll 18, which has heating means (not shown).
Lay-on roll 37.on roll 36, which can guide the PVDC coated nylon film to lamination roll 181-. This can guide the sealant web into the nip between nip roll 19 and lamination roll 18, and take-off roll 38, which after the laminate has passed through the nip between lamination roll 18 and nip roll 19, The lamination row 42-J can be positioned such that the laminate can remain in contact with the lamination row 18.

There are various idler rollers (several shown in the figures, but not identified) which, for example, are used after leaving the first coating station 10 and before going to the second coating 12. film first
It can be guided through the dryer 11.

In one embodiment, the nylon film 30 is
Pass through Kotei/Gestijion 10. ff1l
Coating station directly uses gravure roll 16
and associated nip rolls 20. 1st PVD
The c-coating is applied at a first coating station.

Typically, if the nylon film is oriented,
3.25~6.51g/m2 (2~4 lbs/ream)
PVDC coating of 6.50 to 13.
02 g/m2 of 50% PVD C dispersion, and if the nylon film is substantially unoriented, i.e. cast nylon film, 2.4
4-3.25 g/m2 of PVD (,=+-ting, i.e. 4,88-6,51 g/m2 of 50% P
Apply VDC separation liquid. After drying in the first dryer 11, the second PVDC coating is coated with a 52Pvnc coating in a second coating station. Typically 3.25-6.51 g/m (7
) PVDC: PVDC coated film for l-ting! Second, direct gravure coating by direct gravure roll 17 and associated nip roll 21. Cast nylon film, in this stage, 6.51
It can be coated with PVDC coatings up to g/m2 or higher. This is because the first PVDC coating prevents water in the PVDC dispersion from causing wrinkle formation or bowing of the nylon film. 2nd PVDC coating in 2nd dryer 1
Dry at step 3. In the second dryer 13, P
The amount of heat applied to the VDC coated nylon film is such that the second PVDC coating is sufficiently dry and has sufficient so-called "green tack".
k) controlled to ensure that the PVDC coating is not heated to such an extent that a relatively non-tacky skin film forms on the PVDC coating.

The term "green tack" as used in this field may be a misnomer. This is because it is believed that dried PVDC coatings are not tacky in the commonly accepted sense of the word. It is believed that this term refers to the lack of cross-linking in PVDC coatings. In this method,
The validity of the green tack designation may be confirmed by determining the surface temperature of the PVDC coating M1 just before the PVDC coated film leaves the second dryer. At surface temperatures below about 70'C, the PVDC coating has sufficient green tack for subsequent lamination. At temperatures above about 70°C, for example 85°C, P
The VDC coating has enough green tack for the PVDC coating to be able to adhere well to the sealant web. The PVDC coated nylon film 31 exiting the second dryer 13 is wrapped around the heated lamination roll 18 to which the nylon film contacts. The sealant web 32 is a PVDC coated nylon film 31,
Since the sealant web 32 is coated with PVD
Contact with C coating. , PvDC coated nylon film and sealant web 32 are sandwiched together by applying diamprol 19 to lamination roll 18 . The laminate can then be passed around heated lamination rolls 18 or placed in a pot saw to strengthen the bond between the sealant web and the PVDC coating. . The laminate 33 so formed is wound into a roll, not shown.

In some embodiments of the invention, a medium-sized PVDC coating can be used that functions as both layers of PVDC. The crystallinity specification for a single PVDC is
It must satisfy the standards of the DC layer. Medium PVD
C can be applied in two steps or in one step, as described below. Methods such as IJ1 are particularly useful in the case of oriented nylon, polyester or polypropylene films, whereas 2]-
Such a method would be desirable for cast nylon films. This is because this film tends to curl in the presence of moisture.

Laydown (lay down) in a single application of PVDC coating
In the method of 1-[down), only one coating station and associated dryer would be used. Additionally, for structures with intervening layers of crystalline PVDC, a third coating station and associated dryer (none of which are shown) would be required.

When handling cast nylon films, that is, nylon films that are not substantially oriented, it is necessary to apply lateral tension to the film to prevent it from curling as it passes through the dryer. Dew. This is particularly desirable in dryers that apply heat to only one side of the film, such as the Faustel™ dryer.

When handling oriented nylon, oriented polyester or oriented polypropylene base films, it may be desirable to pass the coated film through a dryer at very low longitudinal tension. So-called floater dryers are suitable. Such a dryer prevents the film from being pulled under tension, which would otherwise induce wrinkles in the film.

If the base film is a sealant web,3 it is necessary that the modulus of the film be less than about 0.4, preferably less than about 0.3, and especially less than about 0.2. Sealant webs having a slip coefficient of less than about 0.2 are sometimes referred to by those skilled in the art as "high slip" films.

The base film also has a metallic coating to render the final film structure substantially impermeable to oxygen. The metal, for example aluminum, can be applied by known methods, for example by vacuum deposition. The amount of metal deposited on the base film depends on the desired oxygen permeability of the final film structure. Typically, aluminum is deposited to an optical density of about 2.5. The optical density is the logarithm of the quotient of the intensity of the ray of wavelength 49-500 nm before passing through the film structure as the dividend and the intensity of the ray after passing through the film structure as the divisor.

Optical density can be measured using a Cary™ 210 UV-visible spectrophotometer. Aluminum-coated base films usually include PVDC next to the aluminum.
Since the mechanical integrity of the aluminum coating is coated with a coating, the mechanical integrity of the aluminum coating may remain when the structure is used in packaging operations, such as when pinholes or scratches may be present on the outside of the package. will not be damaged by.

Base film - PVDC coating - Sealant web structure with colored designs and/or printing
- It is often desirable to apply In the context of the present invention, such designs and/or printing can be placed on the structure using ink applied to the base film or sealant web. Therefore, printing 50-1 o, 11 with base film and PVDC coating
(or between the PVDC coating and the sealant web. Corona discharge treatment of the surface to be printed may be desirable. and PV
It depends on the bond strength with the DC coating. PVD
An ink that bonds well to the C coating and to the base film is selected so that the bond strength between adjacent layers in the f&fin structure is sufficient for the intended end use.

If a PVDC coated base film is available in place of an uncoated film, the PVDC coated base film may need to be heated to substantially destroy the crystallinity of the PVDC width. For example, if a PVDC coating of a precoated base film has a crystallinity of less than 1.15 when dried and left at 20°C for 30 days, and when dried and left for 5 days at 40°C; , 1,12-1.25 crystal 1=
When the PVDC coated base film has
Heat lamination can be performed directly by passing through a Ninpro roll assembly, provided that the temperature of the lamination roll 18 is sufficiently high, e.g.
°C to substantially destroy the crystallinity developed in the PVDC coating. The PVDC coated base film should be heated sufficiently to reduce or maintain crystallinity below 1.05. Such PVDC coated base films, available in rolls, will have slip sheets between the layers of the roll film or will contain anti-blocking agents such as wax or talc.

The base film, pre-coated with a PVDC coating, was coated with PVDC onto the sealant web at a second coating station, and the PVDC was dried and allowed to stand for 30 days at 20'0.
．． having a crystallinity of less than 15 and subsequent drying and heat lamination as described above results in a heat lamination solution.

In this specification, when referring to PVDC precoated films, the calculation of the number of days on which the PVDC crystallinity was determined starts from the time immediately after the applied PV'DC dispersion has dried. should be understood. If the film is coated by a person (coater) other than the person doing the lamination (laminator), it may not be obvious to the laminator how many days the film has been coated and the storage temperature of the film. Therefore, laminators will need to inquire regarding the properties of the PVDC used as the base film coating.

In cases where the base film is a cast nylon film or a sealant web, the lamination temperature should be kept as low as possible to minimize shrinkage and other effects associated with heating the nylon film to too high a temperature. be. In these cases, the following P
Low heat sealing temperatures are advantageous for VDC coatings. Generally, such PVDC coatings have a crystallinity of less than 1.05 when dried and stored for 301'' at 20°C. Three (7) PVDC dispersions suitable in this regard are 5erfene
2011.5erfene2012.5erfene2
It is 015.

When the sealant web is not PVDC coated, the crystallinity of the PVDC coating that comes into contact with the sealant web is 1.0 just before lamination.
Less than 5 is believed to be significant. PVD
The temperature of the C-coated base film should be below about 75°C when leaving the second dryer to sufficiently dry the PVDC coating and maintain the so-called "green tack" of the dried PVDC coating.54- . At temperatures above about 75°C, dry PV
The "green tack" or adhesion of DC coatings may be insufficient. The temperature of the lamination roll is at least about 70°C, preferably at least 85°C.
C such that the PVD C coating remains substantially amorphous or converts to amorphous. More particularly, the temperature of the lamination roll should be at least about 95°C. The temperature of the lamination roll should be below the melting point of the sealant web, preferably at least about 20°C below the melting point of the sealant web. Without wishing to be bound by any theory, it is believed that the selection of the temperature at which the lamination roll is operated depends, in part, on the softening point of the sealant web.

As shown in 1-, the sealant web can contain a slip additive.

Types (7) PVD useful for coating base films and/or laminating sealant webs
C:l-Fig generally has an oxygen permeability of around 15.6 ml/m27 atm/day. This is believed to be sufficient for most applications. If a lower oxygen permeability is required, a highly crystalline PVDC coating within the scope of the PVDC coatings of the present invention could be selected. Alternatively, both sides of the base film can be coated with PVDC.
It can be coated with As an alternative,
A crystalline PVDC coating, such as one having a dry crystallinity of greater than about 1.30, can be sandwiched between the first and second PVDC coatings used in the present invention. As aforementioned,
Aluminum coating base film and PVDC
It can be placed between the coating. When vacuum-deposited aluminum is used, oxygen permeability on the order of 0.75 m1/m2/atmosphere/day can be obtained.

Films of nylon copolymers, such as nylon 6/66, are preferred for applications where package pinhole resistance is required. A preferred laminate for cheese packaging consists of a nylon base film and a sealant web of film made from a blend of linear copolymers of ethylene and C4-C8' alpha-olefins and copolymers of ethylene and vinyl acetate.

As is clear from the following, one method is to coat the film with two coatings of PVDC and then coat the film with two coatings of PVDC.
It consists of heat laminating a C-coated film to a Sealand web. The first PVDC coating is applied under conditions that minimize the chance of curling or wrinkling caused by high temperatures and/or the presence of excessive amounts of moisture. This is primarily due to as little P as possible.
Applying VDC dispersion to nylon film, but not PVD
The coverage of the nylon film with 57-C is achieved so thoroughly that, after drying, during the second application of the PVDC dispersion, there is little chance of water uptake by the 57-nylon film. For these reasons, PVD
The first layer of C dispersion is typically 2.44-3.25 g/m2
(dry standard). Additionally, it is desirable to control the lateral tension of the film as it passes through the dryer. The tension requirements will vary according to the type of nylon film, the application of the PVDC emulsion, the temperature of the dryer, and the type of dryer, eg, one side or two side direction of heat towards the film. Typically, a tension level of 4 to 7 N/m of film width is preferred.

The second coating of PVDC is 2.44~6゜51g/
m2 (dry basis), but from 2.44 to
3.25 g/m2 will be sufficient to achieve the required moisture and oxygen permeability levels in the final film laminate structure.

If the cast nylon film is to be thin, the application speed of the first coating of PVDC should be as low as possible, e.g., about 2.44 to 2.8
It is more important to hold 5 g/m2 and control the lateral tension of the coated film as it passes through the dryer.

However, the preferred method is to apply the sealant web to P
Coated with VDC, thus completely overcoming the moisture sensitivity problem of nylon. In addition to this advantage,
There is a further advantage of being able to choose between 11-coatings of PVDC.

Cast nylon films are sensitive to wrinkling at high temperatures, so the temperature of the laminating roll should be as low as possible and/or? Z. The time that the nylon film is in contact with the laminating roll should be kept to the minimum necessary to achieve the desired bond of the laminate.

The oriented base films useful in this invention are not as sensitive to temperature and moisture as cast nylon films. Therefore, the PVDC coating is two separate layers or? It can be applied as a layer of 1t-. Higher dryer temperatures and laminating temperatures can be used;
And there is no need to apply lateral tension to the film as it passes through the dryer. For oriented base films, a single application of PVDC dispersion is preferred.

When using the method of coating a sealant web with PVDC, it is essential that the surface of the sealant web to be coated with PVDC has a surface tension of at least 38 dynes/cm. Treatment of the surface with ozone or other oxidizing chemicals or corona discharge, as known in the art, is necessary to bring the surface tension to the required minimum level. Corona discharge treatment is preferred.

When the coating and laminating equipment is not owned by the same manufacturer or, for reasons of adaptability, it is inconvenient to combine the coating and laminating equipment in an in-line manner, the coating and laminating process is carried out in a so-called out-of-line manner. - In the line method 2] 2411! It can be achieved by S. In such methods, a base film or sealant web is coated with one or more PVDC coatings and wound onto a roll. P■D when unwinding
To prevent blocking of the C-coated filtrate, a slip sheet can be used or the final PVDC coating can be formulated to include a slimp or anti-blocking agent. The wound roll can then be stored for lamination to a sealant web or base film, as appropriate. The PVDC coated film can then be heat laminated to other films in accordance with the present invention at the appropriate time.

To ensure adhesion of the PVDC coating to the sealant web, in the method of laminating an uncoated sealant web to 1) a VDC coated base film, the PVDC coating has a It is believed that it is necessary to have crystallinity. This can be achieved by heating the PVDC coated film just before or during lamination. The following Example 7 exemplifies the out-of-line method.

The invention will be illustrated by the following examples. Example 1 is
Typical of the prior art.

In an example, the melt index is ASTMD-
1238 (Condition E).

A 15 pLm thick film of an oriented nylon copolymer (a copolymer of 10% by weight ε-caprolactam and 90% hexamethylene diamine adipate) was
Direct gravure coating was carried out at 30.3 m/min at 6.175 g/m2 of 5 erfene 2011 PVDC dispersion with 5% isopropyl alcohol. PVD of 5erfene2011
C when dried and stored at 20°C for 3011 days, ■, 05, and when stored at 40°C for 5 days,
It had a crystallinity of 1.15. The coating was dried in a roll supported arch dryer at a temperature of 70°C as measured with a non-contact infrared pyrometer. PV
The DC coated film was heated to 0.3 on a hot roll from a laminating roll kept at 115°C.
Passage was performed at a residence time of 3 seconds. A 51 μm sealant web was laminated to a PVDC coated nylon film as described herein. The sealant web comprises 85% linear ethylene/butene-1
copolymer, with a density of 0.919 g/cm3 and a melt index of 0.75 dg/min, and 15% by weight of high-pressure polypropylene, i.e. a homopolymer of ethylene, with a density of 0.920 g/cm3 and a Blend with p p m and erucamide (e
rucamide) (slip additive),
The sealant web was corona discharge treated to a surface tension level of 38 dynes/cm.

The resulting laminate was stored at 20°C for 5 days. The bond strength of the laminate is then determined by Suter (S u
t e r) Ill1ll determined by a tester, 11
It was found to be ~20 g/cm.

Other sealant webs containing high pressure polyethylene with a melt index of 2 to 10 dg/min gave similar results.

Example 1 is repeated, but the sealant web is 85 tons
Some linear ethylene/butene-1 copolymers, 0.91
15 parts by weight high pressure polypropylene, having a density of 0.920 g/cm3 and a melt index of 0.75 dg/min, and 15 parts by weight of It consisted of a blend of an ethylene/vinyl acetate copolymer, available under the trademark Elvax 3135X, having a vinyl acetate content of 12% by weight of the copolymer and a melt index of 0.35 dg/min. The sealant web had a slip coefficient of approximately 0.2.

The bond strength of this laminate was tested after storage for 511 hours at 20°C and was found to be 630 g/cm.

Repeating the second example, but with the PV of 5erfene2011
5erfene2060(7)P instead of DC dispersion
A VDC dispersion was used. Serf en e 20
The PVDC dispersion of 60°C had a 100% PVDC dispersion when dried and stored for 30 days at 20°C;

65- It had a crystallinity of 19.

The bond strength of this laminate was tested after storage for 58 hours at 20°C and was found to be 630 g/cm.

1 Repeat Example 3, but instead of the oriented nylon film, a 25 pm thick cast film made from a copolymer of LOtM% ε-prolactam and 90% hexamethylene diamine adipate. It was used.

The bond strength of this laminate was tested after storage for 5 days at 20 °C and was found to be 630 g/cm. However, the laminate curled severely in both the machine and transverse directions, indicating that the moisture was driven off in the dryer and that perhaps the temperature of the thermal laminating rolls was too high for lamination of cast films. .

Example 5 66- The cast film of Example 4 was mixed with 5e of 3.25 g/m2.
coated with rfene2060(7) PVDC dispersion,
Dry. Next, this cast film La High V? ,
tff It was rolled up together with a slip sheet of polyethylene film. After several hours, the cast nylon film was coated with 5erfene 2015 P of 3.25 g/m2.
The VDC dispersion was rolled up again into a wine gully. 5erfene 2015 no PVDC is
When dried and stored at 20°C for 30 minutes, ■,
00, and 40'0 when stored for 5 days.
．． It had 15 crystal faces. 5erfene2015 P
The VDC coating was applied in a roll-supported arch dryer at 70° as measured by a non-contact infrared pyrometer.
Dry at a humidity of C. The PVDC coated film was passed through a laminating roll held at 90°C with a hot roll L at a residence time of 0°33 seconds. The sealant web was laminated to a PVDC coated nylon film as described in Example 2.
1-I did. The resulting laminate was virtually curl-free and tested after storage at 20°C for 511 hours and gave a bond strength of at least 500 g/cm41.

] An 11 pLm thick film of a loosely oriented nylon copolymer (a copolymer of 10 wt % ε-caprolactam and 90 wt ψ % hexamethyldiamine adipate) was
5erfe with 50% isopropyl alcohol added
Direct gravure coating was performed with 7.8 g/m2 of ne2060 PVDC dispersion. The cast film was dried in a roll-supported arch dryer at a temperature of 70° C. as measured with a non-contact infrared pyrometer. The coated film was passed over a hot roll in a laminating roll held at 115°C with a residence time of 33 seconds and laminated to a sealant web. The Sealan I web is made of a 50 parts ethylene/vinyl acetate copolymer, a density of 0.940 g/cm" and a melt index of 1.2 parts per minute and a vinyl acetate content of 18 parts by weight of the copolymer. available under the trademark Ultrathene UE-632.

4z, 5-fold linear ethylene/butene-l copolymer, with a density of 0.919 g/am" and a melt index of 0.75 dg/min, and 7.5-fold high pressure polypropylene, 0.920 g Blen 1ζ, 75 tonne ppm and erucamide (eru
camide) (slip additive).

The resulting laminate was stored at 20°C for 5 days. The bond strength of the laminate was then tested and found to be at least 630 g/cm.

-y''1 Soup E1169 = 15 gm thick oriented nylon 66 film, 97.
7 parts of 5erfene 2060PV ]) 4.06 g of a mixture of C dispersion, 2 parts of DL-96™ wax emulsion and 3 parts of 0X-50™ silicon dioxide anti-blocking agent. Coated with m2. The cast film was dried, rolled up and stored at room temperature for 6 months. The PVDC coating was then found to have a crystal face of 1.31±0.02.

The cast film was then passed through a roll-supported arch dryer at 30.5 m/min with a residence time of 2.5 seconds. The temperature of the dryer was 110°C. The cast film was then passed through laminating rolls 1- held at 115°C. The sealant web of Example 6 was laminated to a PVDC coated nylon film.

The bond strength of the resulting laminate was at least 500 g/cm after storage at 20'C for 5-70-11 hours.

Example 8 Example 2 is repeated, but the sealant web is made of a copolymer of ethylene and vinyl acetate, c-I under the trademark 1060, having a melt index of 1.5 and a vinyl acetate content of 6%. -L I made it from InC0.

The bond strength of the resulting laminate was 5 at 20°C.
5erfene 2060 PVDC sieve containing 5% isopropyl alcohol as in Example 1 with an oriented nylon film with a thickness of 15 gm, at least 630 g/cm after storage for 1 time. 4.06 of liquid
g/m2 directly and dried to a temperature of 70°C, then held at 115°C and passed at a speed of 30-35 m/min.

The residence time of the laminating roll was 0.33 seconds. PVDC coated nylon film, 18
Both sides of a gm thickness were laminated to an acrylic-coated biaxially oriented polypropylene film. The resulting laminate was coated with 5erfene20 containing 5% isopropyl alcohol on the uncoated side of the nylon film.
Coated with 4.06g/m2 of 60PVDC dispersion.

The latter PVDC coating was laminated to the sealant web of Example 6.

The bond strength was measured after storing the laminates at 20°C for 5 days. The bond strength between the coated oriented polypropylene film and the nylon film is approximately 15
0 g/cm and between the EVA-containing film and the nylon film, at least 630
g/cm.

A 15 gm thick nylon copolymer film having a 5erfene2060 PVDC coating was prepared substantially as described in Example 1 and coated with nitrocellulose on one side. Laminated to cellulose film. The resulting laminate i.
was coated on the second side of the nylon as described in Example 9 to form an EVA-containing film heranate.

The bond strength between nylon film and cellulose film is 78 g/ after storage at 20 °C for 5 days.
It turned out to be cm.

A 15 gm thick film of oriented copolymer nylon was coated with Daran™ 820 PVDC dispersion for 6.5 gm.
Co. I. at 99 g/m2.

The coated film was dried and laminated to the EVA-containing film of Example 6 at 115°C.

The bond strength was 35 after storage at 20°C for 5 days.
It was found to be 0 g/cm.

51) A cast nylon 6 film 73- with a thickness of tm is coated with 5erfe containing 5% isopropyl alcohol.
The ne2060 dispersion c7)6 was tecoated at 99 g/m2 and passed through a dryer held at 120'O with a residence time of 4 seconds. The coated film leaving the dryer had a temperature of 74°C. 1U of film,
The sealant web of Example 6 was laminated.

The bond strength was 2 after storage at 20°C for 5 days.
It was found to be 75 g/am. The film curled slightly but was successfully used for thermoforming using a MultiVac™ 8000 vacuum thermoformer.

Disaster relief - 76gm thick cast nylon 66 film, 5
Ser f e containing wt % isopropyl alcohol
Coated with ne2060 dispersion No. 3, 49 g/m2. The coated film leaving the dryer had a surface temperature of 72°C. 12 pieces of the obtained film
5 gm thick sealant web 74-helaminate sheet. The sealant web was made of 85 parts ethylene/butene] copolymer, 0.919 g.
/cm3 and a melt index of 0.75 g/min, and 151” (+ some ethylene/
A copolymer of vinyl acetate was made from a blend of a copolymer having a vinyl acetate content of 12% by weight and a melt index of 35 g/min. The PVDC coated film was passed through a laminating roll held at 112°C with a dwell time of 0.7 seconds on the hot roll, 60% of which time was in contact with the sealant web.

The bond strength of the laminate was found to be 560 g/cm after storage at 20° C. for 5 days. The laminate was 1U flat and thermoformable.

Example ■4 11 Bm thick oriented polyester film.

That is, polyethylene terephthalate film, 40
corona discharge treated to a surface tension level of Tine/Cm, containing 5 tons of isopropyl alcohol.
It was coated with 4.88 g/m2 of erfene2'060 dispersion. The coated film was passed through a dryer maintained at 138°C. The surface temperature of the coated film leaving the dryer was 70°C. The film was passed through a laminating roll maintained at 113°C with a residence time of 0.3 seconds. The coated film was laminated to the sealant web of Example I3.

The bond strength of the laminate was found to be at least 630 g/cm after storage at 20 °C for 5 days.

-y"1"L alternating-85 ton early part linear ethylene/butene-l copolymer, 0
．． A copolymer of ethylene/vinyl acetate of 15 parts by weight, with a density of 91.9 g/cm3 and a melt index of 0.75 g/min, a vinyl acetate content of 188 tons and a melt index of 0.7 dg/min. )・has an index. A sealant web made from a blend of was corona discharge treated to a surface tension level of approximately 42 tines/Cm. This sealant web had a slip coefficient greater than 0.5. This sealant web is
Isopropyl alcohol content in weighted %Se rf en
Coated with 4.3 g/m2 of e2015 PVDc dispersion. The coating was dried and then nipped against a 251i, m thick nylon 66 film while the nylon film was heated to 92°C. I got j+5. in contact with a hot roll.

The obtained laminate was stored at 20°C for 5 days and then
111, a bond strength of at least 600 g/am3, and a measured oxygen permeability of less than 0.8 ml/m27 days/atm.

- The sealant web of Example 2 was dried at approximately 42 dynes/c.
2011 PVDC dispersion at 4°77-8 g/m3, dried and wound together with a slip sheet into a roll. Subsequently, the PVDC coated sealant web was unwound and 4.8 g/m 5erf
ene2015 PVDC dispersion, dried and nipped against a base film that is the same as the sealant web. The base film was contacted to a hot roll heated to 8.2°C.

The resulting laminate had a bond strength of at least 600 g/cm 3 and a measured oxygen permeability of 7.8 ml/m 27/atm after storage for 511 hours at 20°C.

[Brief explanation of drawings]

FIG. 1 shows the method of the invention in diagrammatic form. 10 fB1 coating station 11 1st floor
Liar 12 2nd coating station I3 2nd dryer -78= 14 Nip roll assembly 16 Gravure roll 17 Gravure roll 18 Lamination roll 19 Nipro roll 20 Nip roll 21 Nip roll 30 Nylon film 31 PVDC-coated nylon film 32
Sealant web 33 Laminate 34 Pan 35 Pan 36 Lay-on roll 37 Lay-on roll 38 Take-off roll Patent applicant DuPont Canada, Inc. Representative Patent attorney Taikichi Odajima 79- Supplementary procedure September 6, 1980 [1] Mr. Kazuo Wakasugi, Commissioner of the Japan Patent Office 1, Indication of Case 11i1 Phase 1958 Patent R4 Application No. 141987 Laminated 1
3. Who is making the amendment? 1 What relationship Patent applicant address Canada L5M2H3 Ontario Mississano J Streera Building Box 2200 Name
Dubon Canada Incorporated Column 7 of ``Claims of Features'' for the Specification, Attachment J3 2.4 Fraudulent Claims 1, Base Fill 1, and A film laminate comprising a first sealant web and a PVDC coating sandwiched therebetween, the first sealant web comprising: a) Filno 11 made from a copolymer of ethylene and vinyl acetate; and b) 1) a copolymer of ethylene and vinyl acetate, and 2) a homopolymer of ethylene, or a copolymer of ethylene and one or more 04-CIOα-sinofins, provided that the homopolymer or copolymer is about 0. 91
5 to about 0.955 g/cm") or a blend of said homopolymer and copolymer. The base film is an oriented nylon film, an oriented polyester film, an oriented polypropylene web selected from the group consisting of an oriented polypropylene web, and a second sealant web selected from the group consisting of an oriented polypropylene web and a thread of less than about 0.4; the PVDC coating comprises at least one layer;
This layer has a crystallinity of less than 1.15 when dried and left for 30 days at 20°C.
and when the base film is selected from nylon film, polyester film or polypropylene film, the layer in contact with this base film is dry and
1.12 to 1.25 when left at 0°C for 5 days
A film laminate characterized by having a crystallinity of . 2. Feeding the base film and the first sealant web together between a nip roll and a hot roll, during which the PVD
C coating is applied to at least the base film or the first
applied to a sealant web, provided that when the first sealant web or the second sealant web is in contact with a natural roll, said web in contact with the hot roll has a slip coefficient of less than about 0.4. 2. A method of forming a laminate according to claim 1, characterized in that: 3. a) PVDC coated base film or first
Sealant web, PVDC coated crystal IJ
b) passing the heated PVDC coated base film or first sealant web through a heated roll through E; c) using the PVDC coated base film; contacting a first sealant web with a PVDC coating and sandwiching the first sealant web against a PVDC coated base film between a nip roll and a hot roll to form a laminate;
When using a coated base film, contacting the base film with a PVDC coated first sealan I web between a nip roll and a hot roll to form a laminate. The method described in Section 2. 4. a) PVDC coated base film, PVD
heating the PVDC to an extent sufficient to reduce the crystallinity of the C coating to less than about 1.05, wherein the PVDC
When dried and left at 20°C for 30 days, 1
．． Characterized by having a crystallinity of less than 15 and when the base film is chosen from nylon, polyester or polypropylene films, the PVDC coating dries and has a crystallinity of less than 4
When left at 0°C for 5 days, 1°12-1.2
b) The PVDC coated base film is further characterized by having a crystallinity of 5;
coating with a dispersion to form a second PVD 4-C coating, wherein the second PVDC coating is characterized by having a crystallinity of less than 1.15 when dried and left at 20'O for 3011 minutes. C) dried, followed by a second PVDC coating;
heating until the temperature of the free surface of said second coating is below 75°C; d) passing the resulting PVDC coated base film over a hot roll, said base film being in contact with said hot roll; and the heated roll is at a temperature higher than about 70°C, and e) the first
contacting a sealant web with a second PVDC coating and sandwiching the first sealant web against a PVDC coated base film between a nip roll and a hot roll to form a laminate. Range No. 2 entry □
the method of. 5.a) Heating the PVDC coated base film 5- to a degree sufficient to reduce the crystallinity of the PVDC coating to less than about 1.05, with
PVDC is dried and 3OF1 at 20°C.
Characterized by having a crystallinity of less than 1.15 when left to stand for a period of time, and when the base film is chosen as a nylon film, a polyester film or a polypropylene film, the PVDC coating is dried and has a crystallinity of 511 at 40 °C. coating a first sealant web with an aqueous PVDC dispersion; b) having a surface tension of at least 42 dynes/cm; to form a PVDC coated first sealant web, wherein the PVDC coated sealant web is
The coating is dried and 20' (II!
C) drying the PVDC coating on the first sealant web; d) placing the PVDC-coated hair film on top of the roll; the base film is in contact with a 111 heating roll, the heating roll being at a temperature greater than about 70°C; and e) the PVDC coating of the PVDC coated first sealant web.
C surface is PVDC coated base film PVDC
The PVDC coated sealant web is coated with PVDC in contact with a surface and between a nip roll and a hot roll.
(Laminated by sandwiching 1 piece of coated base film)
・Form. The method according to claim 2, comprising: 6. a) PVDC, : ]-ted by coating the first sealant web with an aqueous PVDC dispersion to form a second PVDC
forming a coating, wherein the second PVDC coating is characterized by having a crystallinity of less than 1.15 when dried and allowed to stand at 20° C.; and the base film is a nylon film, a polyester film; or polypropylene film, the second PVDC coating has a
．． The PVDC coating is further characterized by having a crystallinity of 12 to 1.25 and is adjacent to the first sealant web when dry and at 20'C! b) drying the second PVDC coating; c) passing the base film over a heated roll, wherein said base film is d) contacting the base film with a second PVDC coating, and between the nip roll and the heat roll, the base PVDC coated film 1st
3. The method of claim 2, comprising sandwiching the sealant web to form a laminate. 7.a) Coating the base film with an aqueous PVDC min/fi fluid, the resulting coating having a temperature of 1.15 when dried and left at 20°C for 30 days.
characterized by having less crystallinity,
Also, when the base film is chosen from nylon film, polyester film or polypropylene film, the PVDC coating is further characterized by having a crystallinity of 1.12 to 1.25 when dried and left at 40°C for 5 days. b) drying the PVDC coating; c) passing the PVDC coated base film over a hot roll, wherein the base film = 9= is in contact with the hot roll, and the hot roll has a and: I) PVD
The PVDC-coated surface of the C-coated first sealant web is replaced with the PVDC-coated surface of the PVDC-coated base film.
The PVDC coated sealant web is heated in contact with the coated surface and between the nip roll and the hot roll.
3. The method of claim 2, comprising sandwiching to a VDC coated base film to form a laminate. 8. a) coating a base film with a first PVDC, the coating being characterized by having a crystallinity of less than 1°15 when dried and standing for 30 days at 20°C; is selected from nylon film 1 polyester film or polypropylene film, the PVDC coating is further characterized by having a crystallinity of 1.12 to 1.25 when dried and left at 40°C for 5 days; b) Coating the PVDC coated base film formed in lower punch a) with a second PVDC to form a second P
forming a VDC coating, wherein the second coating is characterized by having a crystallinity of less than 1.15 when dried and left at 20°C for 30 days; The temperature of the free surface of the second coating is lower than 75°C. and said hot roll is in contact with about 7
and e) contacting a sealant web with a second PVDC coating and sandwiching the sealant web against a PVDC coated paste film between a nip roll and a hot roll to form a laminate. , it encompasses things. The method according to claim 2. 9. a) coating a first sealant web having a surface tension of at least 38 dynes/cm with a first PVDC to form a first PVDC coating, wherein the coating is dried and allowed to stand at 20'C for 30 days; b) the PVDC-coated first layer formed in step a) is characterized by having a crystallinity of less than 1.15 when
The sealant web is coated with a second PVDC, wherein the second coating is characterized by having a crystallinity of less than 1.15 when dried and left at 20°C for 30 days, and the base film is nylon. When selected from films, polyester films or polypro-12-pyrene films, the PVDC coating is further characterized by having a crystallinity of 1.12 to 1.25 when dried and left at 40°C for 5 days. c) passing a base film over a hot roll, the base film being in contact with the hot roll, and the hot roll being at a temperature greater than about 70°C; d) steps a) and d) ) contacting the PVDC-coated surface of the PVDC-coated first sealant web formed in step ) with a base film, and sandwiching the PVDC-coated first sealant web against the base film between a nip roll and a hot roll to form a laminate. 3. The method according to claim 2, comprising: . 10. The first sealant web is made of a) a copolymer of ethylene and vinyl acetate, and b)
A copolymer of ethylene and vinyl acetate and 13- (1) a copolymer of ethylene and a CIO α-olefin, provided that the copolymer has a density of about 0°915 to about 0.955 g/cm; and (2)
A homopolymer of ethylene, however, this homopolymer has approximately 0
．． 915 to about 0.955 g/cm3, having a surface adjacent to the PVDC coating of a material selected from the group consisting of: a blend with at least one of: The method described in any of the above. 11. The vinyl acetate acid content of the copolymer of ethylene and vinyl acetate is about 1.0 to about 20% by weight, and the copolymer of ethylene and vinyl acetate is a homopolymer of ethylene;
10. A process according to any of claims 2 to 9, wherein the weight ratio of the copolymers of ethylene or blends thereof is in the range 2:98, 50:50. 12. The method according to any one of claims 2 to 9, wherein the pace fill 11 is a nylon film. 13. The method of any of claims 2-9, wherein the base film is a sealant web having a slip coefficient of less than about 0.3. 14. The hot roll is at a temperature ranging from about 858C to the melting point of the sealant web. A method according to any one of claims 2 to 9.

Claims (1)

Claims: 1. A film laminate comprising a base film, a first sealant web, and a PVDC coating sandwiched therebetween, the first sealant web comprising: a) ethylene and vinyl acetate; and b) 1) a copolymer of ethylene and vinyl acetate and 2) a homopolymer of ethylene or a copolymer of ethylene and one or more 04-CIO α-olefins (
However, this homopolymer or copolymer is about 0.915
0.955 g/cm3) or a blend of said homopolymer and copolymer, said base film being an oriented nylon film, an oriented polyester film, film, an oriented polypropylene film, a cast nylon film, and a second sealant web, said second sealant web being selected from the same group as said first sealant web, and having a diameter of about 0.4
has a smaller slip coefficient, said PVDC coating consists of at least one layer,
This layer has a crystallinity of less than 1.15 when dried and left standing at 20°C for 30 days, and when the base film is selected from nylon film, polyester film or polypropylene film, this base film The contacting layers are dry and 40
A film laminate characterized in that it has a crystallinity of 1.12 to 1.25 when left undisturbed for 5 days at <0>C. 2. Feeding the base film and the first sealant web together between a nip roll and a hot roll, during which the PVD
C coating is applied to at least the base film or the first
applied to a sealant web, provided that when the first sealant web or the second sealant web is in contact with a hot roll, said web in contact with the hot roll has a slip coefficient of less than about 0.4. 2. A method of forming a laminate according to claim 1, characterized in that: 3. a) PVDC coated F base film or first
heating the sealant web to an extent sufficient to reduce the crystallinity of the PVDC coating to less than about 1.05; b) passing the heated PVDC coated base film or first sealant web through a heated roll; c) ) When using a PVDC coated base film, the first sealant web is brought into contact with the PVDC coating and between the nip roll and the hot roll,
1 sealant web is sandwiched against a PVDC coated base film to form a laminate, and the PVDC coated base film is
When using a coated base film, contacting the base film with a PVDC coated first sealant web between a Ninpro roll and a heated roll to form a laminate. The method described in Section 2. 4. a) PVDC coated base film, PVD
heating the PVDC to an extent sufficient to reduce the crystallinity of the C coating to less than about 1.05, wherein the PVDC
When dried and left at 20°C for 30 days, 1.
Characterized by having a crystallinity of less than 15 and when the base film is chosen from nylon, polyester or polypropylene films, the PVDC coating dries and has a crystallinity of less than 40
When left standing for 5 days at °C, 1°12~l, 25
b) The PVDC coated base film is further characterized by having a crystallinity of
coating with a dispersion to form a second PVDC coating, wherein the second PVDC coating, when dried and left at 20'C for 3011 minutes, has a 1.
characterized by a crystallinity of less than 15 C) drying followed by a second PVDC coating;
heating until the temperature of the free surface of the second coating is below 75°C; d) passing the resulting PVDC coated base film through a hot roll, with the base film being in contact with the hot roll; and e) contacting a first sealant web with a second PVDC coating, and between the nip roll and the heat roll, the first sealant is at a temperature greater than about 70°C; 3. The method of claim 2, comprising sandwiching the web against a P-5=VDC coated base film to form a laminate. 5. a) PVDC coated base film, PVD
heating the PVDC to an extent sufficient to reduce the crystallinity of the C coating to less than about 1.05, wherein the PVDC
When dried and left at 20'O for 30 days, 1
．． Characterized by having a crystallinity of less than 15 and when the base film is chosen from nylon, polyester or polypropylene films, the PVDC coating dries and has a crystallinity of less than 4
1°12 to 1.25 when left at 0°C for 5 days
b) coating a first sealant web having a surface tension of at least 42 dynes/cm with an aqueous PVDC dispersion to form a PVDC coated 6-1 sealant web; At this time, the PVDC coating on the Sealan I web was dried and
c) drying the PVDC coating on the first sealant web; c) drying the PVDC coating on the first sealant web; d) PVDC coated base film from roll”
-, the base film being in contact with the hot roll, the hot roll being about 70'C! and e) contacting the PVDC surface of the PVDC-coated first sealant web with the PVDC surface of the PVDC-coated base film, and between a nip roll and a hot roll, the PVDC-coated sealant web is bonded to the PVDC-coated base film. 3. The method according to claim 2, comprising: forming a laminate by sandwiching the laminate between the two. 6. a) coating the PVDC-coated first sealant web with an aqueous PVDC dispersion to form a second PVDC coating, wherein the second PVDC coating has a PVDC coating of 1.15 Characterized by having a lower crystallinity and when the base film is chosen from nylon film, polyester film or polypropylene film, the second PVDC coating has a crystallinity of 1.12 when dried and left at 40° C. for 5 days. ~
said PV further characterized by having a crystallinity of 1.25 and adjacent the first sealant web.
The DC coating is characterized by having a crystallinity of less than 1.15 when dried and left undisturbed for 30 days at 20° C.; b) drying the second PVDC coating; and C) heating the base film d) the base film is in contact with the hot roll and the hot roll is at a temperature greater than about 70°C, and d) the base film is in contact with a second PVDC coating and a nip roll. 3. The method of claim 2, comprising sandwiching the base film against a PVDC coated first sealant web between heated rolls to form a laminate. 7. a) Coating the base film with an aqueous PvDC dispersion, the resulting coating being characterized by having a crystallinity of less than 1.15 when dried and left to stand at 20'O for 30 days. and when the base film is selected from nylon film, polyester film or polypropylene film, the PVDC coating has a crystallinity of 1.12 to 1.25 when dried and left for 5 days at 40°C. b) drying the PVDC coating; c) passing the PVDC coated base film through a hot roll 42, said base film being in contact with said hot roll; and said the hot roll is at a temperature greater than about 70° C., and d) contacting the PVDC coated surface of the PVDC coated first sealant web with the PVDC coated surface of the PVDC coated base film, and between the nip roll and the hot roll, the PVDC
3. The method of claim 2, comprising sandwiching the coated sealant web against a PVDC coated base film to form a laminate. 8. a) Coating the base film with a first PVDC, wherein the coating is characterized by having a crystalline dust of less than 1° lO-15 when dried and left for 30 days at 20°C, and When the base film is chosen from nylon film, polyester film or polypropylene film, the PVDC coating is dried and
b) coating the PVD C coated base film formed in step a) with a second PVDC;
C) forming a PVDC coating, wherein the second coating is characterized by having a crystalline dust of less than 1.15 when dried and left at 20° C. for 30 days; heating until the temperature of the free surface of the second coating is below 75°C; d) passing the resulting PVDC coated base film over a hot roll, said base film being in contact with said hot roll; , and the heat roll is about 70°
and e) contacting a sealant web with a second PVDC coating and sandwiching the sealant web against a PVDC C coated heath film between a nip roll and a hot roll to form a laminate; The method according to claim 2, comprising: 9.a) Coating a first sealant web having a surface tension of at least 38 dynes/Cm with a first PVDC to form a first PVDC coating, the coating being dried and allowed to stand at 20° C. for 30 days. b) coating the PVDC coated first sealant web formed in step a) with a second PVDC;
In this case, the second coating is characterized by having a crystal dust smaller than 1.15 when dried and left to stand at 20°C for 30 days, and the base film is selected from nylon film, polyester film or polypropylene film. When dried, the PVDC coating is further characterized by having a crystal dust of 12 to 1.25 when dried and left at 40° C. for 5 days; d) the base film is in contact with the hot roll, and the hot roll is at a temperature greater than about 70°C; d) the PVDC of the PVDC coated first sealant web formed in steps a) and d); 13- contacting the coated surface with the base film and sandwiching the PVDC coated first sealant web against the base film between a nip roll and a hot roll to form a laminate. The method described in Scope No. 2. 10. The first sealant web is comprised of a) a copolymer of ethylene and vinyl acetate, and b)
Copolymers of ethylene and vinyl acetate and (1) copolymers of ethylene and C4-C10 α-olefins, 1
4, and this copolymer weighs about 0.915 to about 0.955 g.
/cm3. and (2) a homopolymer of ethylene, provided that the homopolymer is from about 0.915 to about 0.
．． having a surface adjacent to the PVDC coating of a material selected from the group consisting of: a blend with at least one of: having a density of 955 g/cm3; the method of. 11. The vinyl acetate content of the copolymer of ethylene and vinyl acetate is about 1.0 to about 20% by weight, and the copolymer of ethylene and vinyl acetate is a homopolymer of ethylene;
Copolymers of ethylene or blends thereof have an IT ratio of 2:98 to 50:50.
The method according to any one of claims 2 to 9, which is within the range of . 12. The method according to any one of claims 2 to 9, wherein the base film is a nylon film. 13. The method according to any of claims 2-9, wherein the base film is a Sealan I web having a slip coefficient of less than about 0.3? Big. 14. The method of any of claims 2-9, wherein the hot roll is at a temperature in the range of about 5°C to the melting point of the sealant web.