POLYISOBUTYLENE SUCCINIC ANHYDRIDE WRAPPING FILM

Abstract

The present invention discloses a thermoplastic wrapping film that includes polyisobutylene succinic anhydride (PIBSA).

Description

Wrapping film with polyisobutylene succinic anhydride CLAIM OF PRIORITY This application claims priority pursuant to 35 USC § 119(e) of US Provisional Patent Application Serial Number 62 / 931,306 filed on November 6, 2019, which is expressly incorporated herein by reference. TECHNICAL FIELD OF THE INVENTION This disclosure relates to a wrapping film, such as an adhesive film and / or a stretch film, that has adhesive properties. More specifically, this disclosure relates to a film that includes polyisobutylene succinic anhydride (PIBSA), which exhibits enhanced adhesive properties with chemically polar materials such as metal and glass. BACKGROUND OF THE INVENTION It is often desirable to wrap a product or its contents for storage, transport, security, protection from the elements, protection from damage, and similar reasons. A film may be provided that can be glued and / or adhered to a product or underlying substrate, including a polar material such as glass, fiberglass, metal, and the like. BRIEF DESCRIPTION OF THE INVENTION According to this disclosure, a thermoplastic film including polyisobutylene succinic anhydride (PIBSA) is disclosed. In illustrative embodiments, a thermoplastic film may include PIBSA in an amount of approximately 0.2% to approximately 10% by weight. A thermoplastic film with PIBSA may demonstrate improved adhesive properties with polar substrates such as fiberglass or metal, for example. In one aspect, for example, a thermoplastic film is provided that has from approximately 0.5% to approximately 10% by weight of polyisobutylene succinic anhydride (PIBSA). In another aspect, for example, a thermoplastic film formulation is provided that has approximately 55% by weight of linear low-density polyethylene (LLDPE), approximately 38% by weight of low-density polyethylene (LDPE), and approximately 5% by weight of PIBSA. i occcnn / zznz / E / YiAi In another additional aspect, for example, a thermoplastic film formulation is provided that has at least 66% by weight of LLDPE, at least 12% by weight of LDPE and at least 5% by weight of PIBSA. The additional features of this disclosure will become apparent to those skilled in the art upon consideration of the illustrative embodiments that exemplify the best way to carry out the disclosure as it is currently perceived. BRIEF DESCRIPTION OF THE FIGURES The detailed description refers in particular to the attached figures in which: Figure 1 is an illustration of a test used to measure the adhesion or bonding of a glass fiber to a film. DETAILED DESCRIPTION OF THE INVENTION The embodiments will now be described more fully below with reference to the accompanying Figure and Tables, which show some, but not all, of the embodiments. As used in the specification and in the accompanying claims, the singular forms a, one, an, the, and the include plural referents unless the context clearly indicates otherwise. The terms substantially or substantially may encompass the specified whole, according to certain realizations, or largely but not the specified whole according to other realizations. The illustrative embodiments in this disclosure relate to a thermoplastic film, such as a polyolefin film, that has adhesive properties. The film may be a single-layer or multi-layer film. For stretch wrapping applications, or for any other reason, the film may have adhesive properties so that it can stick or adhere to itself and / or to one or more articles, products, and / or materials or the like for which the stretch wrapping is intended, for example. In some embodiments, the film may include a polymer composition that produces relatively high adhesion. For example, the adhesive strength may be measured by testing in accordance with ASTM D5458 and / or may be approximately 30 grams or more, approximately 500 grams or less, or in the range of approximately 30 grams to approximately 1000 grams, or in the range of approximately 30 grams to approximately 500 grams, e.g., approximately 100 grams. It is understood that the adhesive strength may be modified and / or vary depending on the application of the film. In some embodiments, the adhesive strength may be approximately 40 g / in or more. The thermoplastic film may include a polyolefin such as polyethylene, polypropylene, an ethylene-vinyl acetate (EVA) copolymer, and / or a methyl acrylate-ethylene (EMA) copolymer and an adhesive resin.The film may include adhesive additives or additives that improve the film's adhesive and / or sticking properties. Useful adhesive additives and / or tackifying agents or bonding resins may include flexomers, plastomers, thermoplastic elastomers, and polyisobutylene (PIB). For example, a PIB additive may have a number-average molecular weight in the range of approximately 1000–3000, or approximately 1200–1800, as measured, for example, by vapor-phase osmometry. Polar groups may be added to PIB, for example, by reaction with maleic anhydride to yield polyisobutylene succinic anhydride (PIBSA). The addition of PIBSA to a thermoplastic and / or polyolefin film for adhesion was previously unknown.Unexpected results were achieved by adding PIBSA to a polyolefin film, for example, a film or film layer with the characteristics described above and elsewhere in the present invention. It was found that a film incorporating PIBSA had approximately twice the adhesion to a glass fiber. In some embodiments, from approximately 0.2% to approximately 10% PIBSA can be added to a thermoplastic film formulation. For example, if the film is a single-layer or monolayer film, the PIBSA may comprise a higher percentage of the film formulation's weight than if one or more additional layers are added. In a monolayer film, for example, the amount of PIBSA may be from approximately 1% to approximately 10.0% by weight of the film and / or film formulation. In a multilayer film, such as a three- or five-layer film, for example, all or fewer of the layers may include PIBSA, and / or the weight of PIBSA may be relatively less than in a monolayer film. For example, in a multilayer film, the amount of PIBSA may be between approximately 0.2% and approximately 10% of the multilayer film's weight.In some films and / or film formulations, the amount of PIBSA may be greater than approximately 0.2%, greater than approximately 0.4%, greater than approximately 0.5%, greater than approximately 1%, greater than approximately 2%, greater than approximately 3%, greater than approximately 4%, greater than approximately 5%, greater than approximately 6%, greater than approximately 7%, greater than approximately 8%, and / or greater than approximately 9%. In some films and / or film formulations, the amount of PIBSA may be less than approximately 15%, less than approximately 14%, less than approximately 13%, less than approximately 12%, and / or less than approximately 11%. In some single-layer films and / or film formulation embodiments, the amount of PIBSA may be less than approximately 15% and greater than approximately 1%, less than approximately 13% and greater than approximately 2%, less than approximately 12% and greater than approximately 5%, less than approximately 12% and greater than approximately 8%, and / or approximately 10%. In some multi-layer films and / or film formulation embodiments, the amount of PIBSA may be less than approximately 10% and greater than approximately 0.2%, less than approximately 5% and greater than approximately 0.2%, less than approximately 2% and greater than approximately 0.2%, less than approximately 2% and greater than approximately 0.4%, and / or approximately 0.5%. In one example, a film formulation includes approximately 55 wt% linear low-density polyethylene (LLDPE), approximately 38 wt% low-density polyethylene (LDPE), approximately 1 wt% antiblocking concentrate, approximately 1 wt% processing aid, and approximately 5 wt% PIBSA. The PIBSA in this example is Dovermulse H1000, commercially available from Dover Chemical Corporation of Dover, Ohio. The resulting PIBSA film exhibited an adhesive or bonding strength on approximately 180 grams of fiberglass, measured by pulling on fiberglass 200 as shown in Figure 1. In the test, a single strand of fiberglass 200, 8.5 inches (21.59 cm) long, was applied along a strip of film 100 that was approximately 12 inches (30.48 cm) long by 1 inch (2.54 cm) wide.In Figure 1, which is not to scale, film 100 is shown as a rectangle with a strand or fiberglass 200 placed or pressed onto it. The arrows in Figure 1 represent the relative movement or pulling force F used to measure adhesion. A control experiment was conducted in the same manner, but with a film using PIB instead of PIBSA, resulting in an adhesive strength of approximately 90 grams. The example using PIBSA was provided by adding PIBSA to a polyethylene melt and extruding it into a film at temperatures up to approximately 450 degrees Fahrenheit. In another example, a film formulation includes approximately 76% of i occnn / zznz / E / YiAi LLDPE, approximately 12% LDPE, 7% white UVI polyethylene master blend, and 5% PIBSA. In some embodiments, a film formulation may include between approximately 56% and approximately 86% LLDPE, between approximately 8% and approximately 16% LDPE, between approximately 2% and approximately 12% UVI polyethylene, and / or between approximately 0.2% and approximately 10% PIBSA. The film may further comprise additional resins and additives. For example, the film may comprise a puncture-resistant resin. In another example, the film may also comprise a low-density polyethylene (LDPE) resin having a density of approximately 0.91 to 0.94 g / cm³, an LLDPE resin having a density of approximately 0.915 to 0.940 g / cm³, and / or a very low-density polyethylene (VLDPE) resin having a density of approximately 0.88 to 0.915 g / cm³. In some embodiments, polyethylene resins are used in the film and are blended or alloyed with smaller amounts, for example, up to approximately 20% by total weight, of one or more suitable resins to achieve a desired range of physical / mechanical properties in the film product. In some embodiments, film additives such as antioxidants, UV stabilizers, pigments, colorants, etc., are used in the film. It is understood that some additives, such as antioxidants, for example, may be provided with the resin instead of or in addition to being added separately. The polyolefin film described above can be provided substantially in a single-layer or monolayer structure, or it can be provided as one layer of a multilayer film structure. In general, embodiments of Film 100 are constructed according to conventional practices. Film 100 can be manufactured using either blown film or melt film coextrusion. In one embodiment, a melt film manufacturing process provides resin materials that are heated to their molten state, and their viscosities are coordinated to prepare uniformly multilayer films. The molten materials are conveyed to a coextrusion adapter that combines the molten materials to form a multilayer coextruded structure. The layered polymer material is transferred through an open extrusion die to a predetermined gap, commonly in the range of approximately 0.05 inches (0.13 cm) to 0.0.012 inches (0.03 cm). The material is then reduced to the intended gauge thickness by means of a primary chiller or casting roll maintained between approximately 50 °F and approximately 130 °F. Typical reduction ratios range from approximately 5:1 to approximately 40:1. The overall thickness of the single-layer or multi-layer film can vary widely according to the end-use specifications, but it is generally within the range of typical thicknesses for stretchable wrapping films. In one embodiment of the present invention, the overall thickness of film 100 is between approximately 0.012 mm and approximately 0.125 mm. In one embodiment, the thickness of film 100 is approximately 0.025 mm. Once manufactured, in some embodiments, the film or any layer thereof may be treated after forming by implementing operations such as corona discharge, chemical treatment, flame treatment, etc., to modify the printability or ink receptivity of the surface(s) or to impart other desirable characteristics. According to embodiments of the invention, the film can be supplied in an unstretched, i.e., unoriented, state, or simply slightly stretched before use. Film 100 is capable of stretching at least between approximately 40% and 400% during a wrapping stage of the final products. According to embodiments of the present invention, the adhesive properties of the film are unexpectedly improved. These advantageous results may be an approximate outcome of the specific compositions used in the film with various embodiments of the present disclosure. With the addition of PIBSA to the film and / or the film formulation, the film adheres better to polar substrates, such as the 200-gauge glass fiber used in the test and shown in Figure 1. A single-layer or multi-layer film incorporating PIBSA can be provided in a variety of ways, such as by blowing or melting the film, or any combination thereof. For example, PIB and / or PIBSA have been found to migrate to the surface of a film within days of extrusion and do not block bubbles during film manufacturing. PIB and PIBSA have also been found to provide improved adhesion between the relatively less smooth surfaces of a blown film. For example, an effective amount of PIBSA can migrate to at least one surface of the film to provide an adhesive strength of at least approximately 40 g / in². As used in the present invention, the term comprising means that various components may be employed in the methods, formulations, and compositions i occnn / zznz / E / YiAi with or without additional or alternative components. Accordingly, the terms “consisting essentially of” and “consisting of” are incorporated within the term comprising. Those skilled in the art may make modifications and variations without departing from the spirit and scope. Furthermore, it should be understood that aspects of the various embodiments may be interchangeable in whole or in part. Moreover, those skilled in the art will appreciate that the foregoing description is by way of example only and is not intended to limit the scope of what is described in the claims. Therefore, the spirit and scope should not be limited to the exemplary description of the versions contained herein. The following numbered clauses include realizations that are contemplated and are not exhaustive: Clause 1. A thermoplastic film comprising from about 0.2% to about 10% by weight of polyisobutylene succinic anhydride (PIBSA). Clause 2. The thermoplastic film in accordance with clause 1, any other suitable clause, or any combination of suitable clauses, wherein the film comprises at least one of polyethylene and polypropylene. Clause 3. The thermoplastic film in accordance with clause 2, any other suitable clause, or any combination of suitable clauses, wherein the film comprises at least 80% polyethylene, polypropylene, or mixtures thereof. Clause 4. The thermoplastic film in accordance with clause 3, any other suitable clause, or any combination of suitable clauses, wherein the film is suitable for adhesion wrapping with an adhesive strength of at least approximately 40 g / in provided by an effective amount of PIBSA present on at least one surface of the film. Clause 5. The thermoplastic film in accordance with clause 4, any other suitable clause, or any combination of suitable clauses, wherein the film is produced by blow molding. Clause 6. The thermoplastic film in accordance with clause 5, any other suitable clause, or any combination of suitable clauses, wherein the film is produced by melt extrusion. Clause 7. The thermoplastic film in accordance with clause 6, any other suitable clause, or any combination of suitable clauses, wherein the film includes between approximately 1% and approximately 12% PIBSA. i occcnn / zznz / E / YiAi Clause 8. The thermoplastic film in accordance with clause 7, any other suitable clause, or any combination of suitable clauses, wherein the film is a multi-layer film. Clause 9. The thermoplastic film in accordance with clause 8, any other suitable clause, or any combination of suitable clauses, wherein the multilayer film includes at least three layers. Clause 10. The thermoplastic film in accordance with clause 9, any other suitable clause, or any combination of suitable clauses, wherein the multilayer film structure includes between approximately 0.2% and approximately 2.0% PIBSA. Clause 11. A thermoplastic film formulation comprising approximately 55% by weight of linear low-density polyethylene (LLDPE). Clause 12. The thermoplastic film formulation in accordance with clause 11, any other suitable clause, or any combination of suitable clauses, further comprising approximately 38% by weight of low-density polyethylene (LDPE). Clause 13. The thermoplastic film formulation in accordance with clause 12, any other suitable clause, or any combination of suitable clauses, further comprising approximately 5% by weight of PIBSA. Clause 14. The thermoplastic film formulation in accordance with clause 13, any other suitable clause, or any combination of suitable clauses, forming at least partially a bottom of the container, the floor having a first floor thickness. Clause 15. The thermoplastic film formulation in accordance with clause 14, any other suitable clause, or any combination of suitable clauses, further comprising a neck disposed between the body and the opening and configured to allow passage of contents into and out of the product storage region, the neck having at least a neck wall thickness at a first neck location. Clause 16. The thermoplastic film formulation in accordance with clause 15, any other suitable clause, or any combination of suitable clauses, further comprising approximately 1% by weight of anti-blocking concentrate. Clause 17. The thermoplastic film formulation in accordance with clause 16, any other suitable clause, or any combination of suitable clauses j occnn / zznz / E / YiAi, further comprising approximately 1% by weight of processing aid. Clause 18. A thermoplastic film formulation comprising at least approximately 66% by weight of LLDPE. Clause 19. The thermoplastic film formulation in accordance with clause 18, any other suitable clause, or any combination of suitable clauses, further comprising at least approximately 12% by weight of LDPE. Clause 20. The thermoplastic film formulation in accordance with clause 19, any other suitable clause, or any combination of suitable clauses, further comprising at least approximately 5% by weight of PIBSA. Clause 21. The thermoplastic film formulation in accordance with clause 20, any other suitable clause, or any combination of suitable clauses, further comprising approximately 7% white UV-resistant polyethylene master blend. Clause 22. The thermoplastic film formulation in accordance with clause 21, any other suitable clause, or any combination of suitable clauses, further comprising at least approximately 76% by weight of LLDPE.

Claims

1. A thermoplastic film, comprising: from about 0.2% to about 10% by weight of polyisobutylene succinic anhydride (PIBSA).

2. The film according to claim 1, wherein the film comprises at least one polyethylene and one polypropylene.

3. The film according to claim 2, wherein the film comprises at least 80% polyethylene, polypropylene, or mixtures thereof.

4. The film according to claim 1, wherein the film is suitable for adhesion wrapping with an adhesive strength of at least approximately 40 g / in provided by an effective amount of PIBSA present on at least one surface of the film.

5. The film according to claim 1, wherein the film is produced by blow molding.

6. The film according to claim 1, wherein the film is produced by melt extrusion.

7. The film in accordance with claim 1, wherein the film includes between approximately 1% and approximately 12% of PIBSA.

8. The film according to claim 1, wherein the film is a multilayer film.

9. The film according to claim 8, wherein the multilayer film includes at least three layers.

10. The film according to claim 9, wherein the multilayer film structure includes between approximately 0.2% and approximately 2.0% PIBSA.

11. A thermoplastic film formulation comprising: approximately 55% by weight of linear low-density polyethylene (LLDPE), approximately 38% by weight of low-density polyethylene (LDPE), and approximately 5% by weight of PIBSA.

12. The thermoplastic film formulation according to claim 11, further comprising approximately 1% by weight of anti-blocking concentrate.

13. The thermoplastic film formulation according to claim 11, further comprising approximately 1% by weight of process adjuvant i Qccnn / zznz / E / YiAi.

14. A thermoplastic film formulation comprising: at least approximately 66% by weight of LLDPE; at least approximately 12% by weight of LDPE; and at least approximately 5% by weight of PIBSA.

15. The thermoplastic film formulation according to claim 14, further comprising approximately 7% white UV-resistant polyethylene master blend.

16. The thermoplastic film formulation according to claim 14, comprising at least approximately 76% by weight of LLDPE.