Polyurethane condom with adhesive layer and method of making same

Abstract

A polyurethane condom (100) with an adhesive layer (20) and a method thereof are disclosed. The polyurethane condom (100) with an adhesive layer (20) comprises a first polyurethane film layer (10), an adhesive layer (20) located on the first polyurethane film layer (10), and a second film layer (30) located on the adhesive layer (20). The adhesive layer (20) comprises a substance consisting of 0-100% by weight of a polar component, 0-100% by weight of a non-polar component, and 0-100% by weight of a polar-non-polar component. The adhesive layer (20) has a thickness of 0.1-30 μm.

Description

Technical Field

[0001] This application relates to the field of condom materials, and more specifically, to a polyurethane condom with an adhesive layer and a method for preparing the same. Background Technology

[0002] Condoms are currently the most widely used and simple contraceptive and sexually transmitted disease prevention device in the world. Existing products mainly include natural latex rubber condoms and water-based polyurethane condoms.

[0003] Currently, natural latex condoms are thick due to the material properties of natural latex, and the presence of various proteins in natural latex poses a safety risk to individuals with protein allergies. Polyisoprene condoms are soft, transparent, and protein-free, but they also suffer from thickness and lower strength.

[0004] As people's living standards improve, consumers' demands for condoms go beyond the basic function of contraception; they increasingly seek a better user experience. Polyurethane condoms, due to their high strength and biocompatibility, are a relatively new product on the market, offering consumers a more realistic and pleasurable experience. However, polyurethane's softness is somewhat inferior to that of natural rubber or polyisoprene. A single polyurethane resin struggles to achieve ideal softness, burst resistance, water resistance, and strength. Furthermore, even when polyurethane is combined with natural latex or polyisoprene, the polar nature of polyurethane resin and the non-polar nature of natural rubber and polyisoprene can lead to poor adhesion and delamination during lamination, hindering industrial production.

[0005] Therefore, providing a new type of condom that achieves optimal performance and meets market demands is of great significance. Summary of the Invention

[0006] To address the above issues, the purpose of this application is to provide a polyurethane condom with an adhesive layer. This condom is thin and possesses excellent softness and strength, meeting market demands.

[0007] This application provides a polyurethane condom with an adhesive layer, the polyurethane condom with an adhesive layer comprising at least: a first polyurethane film layer; an adhesive layer located on the first polyurethane film layer; a second film layer located on the adhesive layer; the adhesive layer comprising a substance composed of 0-100% by weight of a polar component, 0-100% by weight of a non-polar component, and 0-100% by weight of a polar-non-polar component; the adhesive layer having a thickness of 0.1-30 μm.

[0008] In one embodiment, the polyurethane condom with adhesive layer has a burst pressure greater than or equal to 1 kPa and / or a burst volume greater than or equal to 5 L.

[0009] In one embodiment, the thickness of the polyurethane condom with the adhesive layer is 0.010-0.080 mm.

[0010] In one embodiment, the 100% tensile modulus of the adhesive layer is less than or equal to 2.5 N / mm². 2 .

[0011] In one embodiment, the polar component is selected from any one or any combination thereof of polyurethane resin, chloroprene rubber, polyvinyl acetate resin, acrylonitrile-butadiene-styrene, vinyl acetate-ethylene copolymer resin, polyacrylate, polyvinyl chloride, protein, starch, cellulose, and epoxy resin.

[0012] In one embodiment, the adhesive layer comprises 100% by weight of the polar component, and the polar component is a polyurethane resin.

[0013] In one embodiment, the polyurethane resin is selected from any one of anionic, cationic, nonionic, amphoteric waterborne polyurethane, or solvent-based, solvent-free polyurethane, or any combination thereof.

[0014] In one embodiment, the polyurethane resin is any one of polyether type, polyester type, and polyether-polyester hybrid polyurethane, or any combination thereof.

[0015] In one embodiment, the anionic waterborne polyurethane is a carboxylic acid type, a sulfonic acid type, or a mixture of both.

[0016] In one embodiment, the nonpolar component is selected from one or any combination thereof, including natural rubber, polyolefins, silicone resins, butyl rubber, styrene-butadiene rubber, ethylene propylene diene monomer (EPDM) rubber, polystyrene, polyisoprene, polyesters, rosin resins, terpene resins, and their derivatives.

[0017] In one embodiment, the polar-nonpolar component is selected from organically modified polar or nonpolar polymer materials.

[0018] In one embodiment, the organic modification is selected from any one or any combination thereof, including organosilicon modification, organofluorine modification, silane modification, acrylate copolymerization modification, vinyl modification, aromatic monomer modification, polyether modification, polyester modification, isocyanate modification, amination, carboxylation, hydroxylation, epoxidation, sulfonation, and polymerization modification.

[0019] In one embodiment, the adhesive layer comprises 50% by weight of a polar component and 50% by weight of a non-polar component.

[0020] In one embodiment, the adhesive layer comprises at least one layer.

[0021] In one embodiment, the 100% modulus of the second film layer is less than or equal to 1 N / mm². 2 .

[0022] In one embodiment, the second film layer is a layer made of polyurethane resin.

[0023] In one embodiment, the second film layer is a layer made of natural rubber or polyisoprene resin.

[0024] This application also provides a polyurethane condom with an adhesive layer, the polyurethane condom comprising: a first polyurethane film layer; a first adhesive layer located on the first polyurethane film layer; a second film layer located on the adhesive layer; a second adhesive layer located on the second film layer, the second adhesive layer having the same structure as the first adhesive layer; a third polyurethane film layer located on the second film layer, the third polyurethane film layer having the same structure as the first polyurethane film layer; the first adhesive layer comprises a substance composed of 0-100% by weight of a polar component, 0-100% by weight of a non-polar component, and 0-100% by weight of a polar-non-polar component; the first adhesive layer has a thickness of 0.1-30 μm; the 100% tensile modulus of the first adhesive layer is less than or equal to 2.5 N / mm. 2 The second film layer comprises natural rubber or polyisoprene resin; the polyurethane condom has a thickness of 0.010-0.080 mm.

[0025] This application also provides a method for preparing a polyurethane condom with an adhesive layer, comprising at least the following steps: impregnating polyurethane resin and drying to form a first polyurethane film layer; impregnating an adhesive layer material on the first polyurethane film layer and drying to form an adhesive layer; impregnating a second film layer material on the adhesive layer and drying to form a second film layer; impregnating a release agent on the second film layer, and then drying, demolding, and electrical testing to obtain the polyurethane condom; wherein the adhesive layer material comprises a substance composed of 0-100% by weight of a polar component, 0-100% by weight of a non-polar component, and 0-100% by weight of a polar-non-polar component; and wherein the adhesive layer has a thickness of 0.1-30 μm.

[0026] In one embodiment, the impregnation is performed by impregnating a first polyurethane resin through a mold made of glass or a thermoplastic polymer.

[0027] The polyurethane condom with an adhesive layer provided in this application utilizes an adhesive layer added to the middle of the polyurethane condom to bond film layers with similar or different properties together in a composite molding process. This fully leverages the performance advantages of each layer material. The condom has a thickness of 0.010-0.080 mm and exhibits excellent softness, strength, and other properties, meeting market demands. Furthermore, the polyurethane condom with the adhesive layer does not delaminate after immersion in an alkaline solution at 50-70°C for 1-10 minutes, demonstrating ideal interlayer adhesion. In addition, the formulation of this application has low cost, employs dip molding, and features a simple, safe, and environmentally friendly molding process. Other features, benefits, and advantages will become apparent from this disclosure, including the detailed description and claims. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of a specific embodiment of the polyurethane condom with an adhesive layer according to this application.

[0030] Figure 2 for Figure 1 A schematic diagram of the structural layers of a polyurethane condom.

[0031] Figure 3 This is a schematic diagram of another specific embodiment of the construction layers of a polyurethane condom.

[0032] Figure 4 A schematic flowchart illustrating a specific embodiment of the method for preparing the polyurethane condom with an adhesive layer according to this application is shown. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be configured and designed to meet various different needs.

[0034] like Figures 1 to 4As shown, this application provides a polyurethane condom 100, which is a condom made of polyurethane material, possessing high strength, high density, and good biocompatibility. The thickness of the polyurethane condom 100 can be, for example, 0.001mm-0.08mm, more specifically, 0.05mm-0.04mm, such as 0.005mm, 0.01mm, 0.015mm, or 0.02mm, providing users with a more comfortable experience and a softer, more delicate skin-friendly feel. Furthermore, it does not cause allergic reactions. The polyurethane condom 100 provided in this application does not exhibit delamination when immersed in an alkaline solution at 50-70℃ for 1-10 minutes, and for example, does not exhibit delamination when immersed in a sodium hydroxide solution at 50℃ for 3 minutes.

[0035] The polyurethane condom 100 within the aforementioned thickness range has a burst pressure of, for example, greater than or equal to 1 kPa, further greater than or equal to 3 kPa, such as 3 kPa, 4 kPa, or 5 kPa, and a burst volume of, for example, greater than or equal to 5 L, such as 8 L, 12 L, or 18 L.

[0036] The strength of polyurethane condoms 100, for example, tensile strength, can be greater than or equal to 30 MPa, further, greater than or equal to 40 MPa, and 100% modulus, for example, less than 2.5 N / mm². 2 For example, 2N / mm 2 1.8N / mm 2 1.5N / mm 2 1N / mm 2 .

[0037] like Figure 1 and Figure 2 As shown, this application provides a specific embodiment of a polyurethane condom 100, which can be composed of multiple layers, such as 3, 4, 5, or 6 layers, and is not limited thereto; adjustments can be made according to actual needs. Here, the polyurethane condom 100 is constructed as a male condom. It should be understood that it can also be made into a female condom, as well as other non-standard condoms, etc. Any polyurethane condom 100 product containing the layered structure of this application should be covered within the scope of protection claimed in this application.

[0038] like Figure 1 and Figure 2 As shown, the polyurethane condom 100 includes a first polyurethane film layer 10, an adhesive layer 20, and a second film layer 30. The first polyurethane film layer 10 can serve as the innermost layer of the polyurethane condom 100, which contacts the skin during use, or it can serve as the outermost layer, depending on actual needs.

[0039] like Figure 2As shown, the first polyurethane film layer 10 is a layer composed of polyurethane resin, or it can be a layer composed of an emulsion formed by the polyurethane resin and other additives. The additives can be, for example, functional additives such as lubricants, bactericides, thickeners, wetting agents, defoamers, etc., but are not limited to these. The polyurethane resin can be any suitable type of aliphatic or aromatic polyurethane, further, for example, anionic, cationic, nonionic, amphoteric waterborne polyurethane, or solvent-based or solvent-free polyurethane. The desired polyurethane can be prepared by adjusting the raw materials and preparation process of the polyurethane.

[0040] In some embodiments, the tensile strength of the polyurethane resin may be greater than or equal to 25 MPa, and further greater than or equal to 30 MPa, such as 35 MPa, 38 MPa, 40 MPa, 55 MPa, or 60 MPa, thereby constituting a high-strength polyurethane resin A, and the first polyurethane film layer 10 formed therefrom has high tensile strength and is not easily damaged.

[0041] In some embodiments, the 100% tensile modulus of the polyurethane resin may be less than or equal to 3.5 N / mm². 2 For example, 3.2 N / mm 2 3N / mm 2 2.8N / mm 2 2.5N / mm 2 2N / mm 2 1.8N / mm 2 1.5N / mm 2 0.6N / mm 2 This constitutes a low-modulus polyurethane resin B, and the resulting first polyurethane film layer 10 has good flexibility.

[0042] In some embodiments, the elongation at break of the polyurethane resin may be greater than or equal to 500%, such as 600% or 700%, and further greater than or equal to 800%, such as 830%, 900%, or 1000%, thereby constituting a high-elongation polyurethane resin C, and the first polyurethane film layer 10 formed therefrom having high elongation and tensile properties.

[0043] In some embodiments, after the dry film of the polyurethane resin is immersed in water at 30-60°C for 0.1-1 h, for example, in water at 40°C for 0.5 h, in water at 50°C for 0.5 h, or in water at 50°C for 0.6 h, the wet film tensile strength retention rate is greater than or equal to 60%, for example, maintained at 65% or 75%, thereby constituting a water-resistant polyurethane resin D, and the first polyurethane film layer 10 formed therefrom has good water resistance.

[0044] In some embodiments, the polyurethane resin can be used to make condoms alone, and when a condom with a diameter of 10-25 μm is formed, such as 20 μm or 22 μm, the burst pressure of the condom is greater than or equal to 1.0 kPa, such as 2.0 kPa, 3.0 kPa, 4.0 kPa, or 5.0 kPa, thereby constituting a high burst pressure polyurethane resin E.

[0045] In some embodiments, the polyurethane resin can be used alone to make condoms, and when a condom with a diameter of 10-25 μm is formed, such as 20 μm or 22 μm, the burst volume of the condom is greater than or equal to 5 L, such as 8 KPa, 10 KPa, 12 KPa, 15 KPa, or 18 KPa, thereby constituting a high burst volume polyurethane resin F.

[0046] It should be understood that this is only an example of several properties of the polyurethane resin in the first polyurethane film layer 10. Of course, it is not limited to this. More polyurethane resins with different properties can be formed according to actual needs, such as tear-resistant, oil-resistant, anti-stick, and anti-electrical breakdown types.

[0047] like Figure 2 As shown, the first polyurethane film layer 10 may have a thickness of 0.1-20 μm, for example, 0.3 μm, 1 μm, 3 μm, 5 μm, or 10 μm.

[0048] Please continue reading. Figure 1 and Figure 2 The adhesive layer 20 is located on the first polyurethane film layer 10, and the adhesive layer 20 comprises a substance consisting of 0-100% by weight of a polar component, 0-100% by weight of a non-polar component, and 0-100% by weight of a polar-non-polar component. For example, the adhesive layer 20 may be a layer composed of 100% by weight of a polyurethane-friendly polar component, a layer composed of 100% by weight of a natural rubber- or polyisoprene resin-friendly non-polar component, a layer composed of 100% by weight of a polar-non-polar component, or a layer composed of 50% by weight of a polar component, 50% by weight of a non-polar component, 50% by weight of a polar component, 30% by weight of a non-polar component, and 20% by weight of a polar-non-polar component, etc.

[0049] The polar component refers to, for example, a polymer material with polar groups. Specific examples include polyurethane, chloroprene rubber, polyvinyl acetate resin, acrylonitrile-butadiene-styrene, vinyl acetate-ethylene copolymer resin, polyacrylates, polyvinyl chloride, proteins, starch, cellulose, epoxy resins, etc. For example, the adhesive layer 20 is a layer composed of 100% by weight of polyurethane, or it can be a layer composed of an emulsion formed by the polyurethane resin and compounded with other additives. The additives can be functional additives, such as lubricants, bactericides, thickeners, wetting agents, defoamers, etc., but are not limited to these. The polyurethane resin can be any suitable type of aliphatic or aromatic polyurethane, further, such as anionic, cationic, nonionic, amphoteric, solvent-based, or solvent-free polyurethane. Even further, the anionic type can be carboxylic acid type, sulfonic acid type, or a mixture of both. The desired polyurethane can be prepared by adjusting the raw materials and preparation process of the polyurethane. Based on the viewpoint of obtaining the adhesion of the adhesive layer 20 and balancing the performance between the first polyurethane film layer 10 and the second film layer 30, the polyurethane resin of the adhesive layer 20 is different from the polyurethane resin of other film layers. The polyurethane resin is a low-modulus polyurethane material, synthesized using polyether and / or polyester polyol. As a result, polyether-type, polyester-type, and polyether-polyester hybrid polyurethane resins are obtained. These polyurethane resins have good adhesion to other polyurethanes and natural latex or polyisoprene materials, while also being flexible.

[0050] The nonpolar component refers to polymeric materials with nonpolar groups, such as natural rubber, polyolefins, silicone resins, butyl rubber, styrene-butadiene rubber, ethylene propylene diene monomer (EPDM) rubber, polystyrene, polyisoprene, polyesters, rosin resins, terpene resins, rosin resins and their derivatives.

[0051] The polar-nonpolar component refers, for example, to a polymer material that simultaneously possesses polar and nonpolar groups, thus exhibiting both polar and nonpolar properties. This can be achieved by modifying polar materials, such as polar polymers, with materials containing nonpolar groups. In some specific embodiments, polyisoprene polyols and vinyl-modified waterborne polyurethanes are used. Alternatively, nonpolar materials, such as nonpolar polymers, can be modified with materials containing polar groups. For example, polyvinyl alcohol or polyacrylic acid can be used to modify natural rubber, thereby obtaining a polymer material that simultaneously possesses polar and nonpolar groups.

[0052] Furthermore, it should be understood that the modification process can obtain a polymer material possessing both polar and nonpolar groups by organically modifying the polar or nonpolar material. The organic modification includes, but is not limited to, organosilicon modification, organofluorine modification, silane modification, acrylate copolymerization modification, vinyl modification, aromatic monomer modification, polyether modification, amination, carboxylation, epoxidation, hydroxylation, sulfonation, and polymerization modification. Further, the modification process can be chemical modification, physical modification, or any other suitable method.

[0053] In other embodiments, the material of the adhesive layer 20 may also be reactive with the first polyurethane film layer 10 and the second film layer 30. Specifically, the material of the adhesive layer 20 may contain groups such as vinyl, silyl, amino, carboxyl, and hydroxyl groups, thereby enabling it to react with polyurethane or vinyl and form chemical bonds with polyurethane or natural rubber.

[0054] The structure of the adhesive layer 20 differs from that of other film layers, and the 100% tensile modulus of the material of the adhesive layer 20 is less than or equal to 2.5 N / mm². 2 For example, 2N / mm 2 1.8N / mm 2 1.5N / mm 2 1.2N / mm 2 1N / mm 2 0.8N / mm 2 .

[0055] Please continue reading. Figure 1 and Figure 2 The adhesive layer 20 serves as an intermediate layer, tightly bonding the film layers on both sides. It comprises at least one layer, such as one, two, or three layers, with other material film layers laminated to both sides of each layer. Based on obtaining a low-modulus, high-adhesion adhesive layer 20 and the desired performance of the polyurethane condom 100, the adhesive layer 20 may, for example, have a thickness of 0.1-30 μm, further, 0.1-20 μm, such as 1 μm, 2 μm, 3 μm, 5 μm, 10 μm, or 15 μm. Furthermore, because the material of the adhesive layer 20 has a low modulus and low strength, the thickness of the adhesive layer 20 as a percentage of the total thickness of the polyurethane condom 100 is less than or equal to 40%, further less than or equal to 35%, such as 30% or 25%.

[0056] like Figure 2 As shown, the second film layer 30 is located on the adhesive layer 20. The second film layer 30 can be, for example, any material that can form a film.

[0057] like Figure 2As shown, based on a polyurethane condom 100 that achieves the desired thickness and desired interlayer adhesion, the second film layer 30 may have a thickness of, for example, 0.1-30 μm, such as 1 μm, 2 μm, 3 μm, 5 μm, 10 μm, 15 μm, or 20 μm.

[0058] In some embodiments, the second film layer 30 is, for example, a layer made of polyurethane resin, or a layer made of an emulsion formed by the polyurethane resin and compounded with other additives. The additives may be functional additives, such as lubricants, bactericides, thickeners, wetting agents, defoamers, etc., but are not limited thereto.

[0059] At this time, the structure of the second polyurethane film layer 30 can be the same as that of the first polyurethane film layer 10. Specifically, for example, the properties of the polyurethane resin in the second polyurethane film layer 30 can be the same as those in the first polyurethane film layer 10. Specifically, the polyurethane resins in the first polyurethane film layer 10 and the second polyurethane film layer 30 can be the same resin, either high-strength polyurethane resin A, low-modulus polyurethane resin B, or high-elongation polyurethane resin C. After bonding by the adhesive layer 20 (for example, when the adhesive layer resin is labeled with N), polyurethane condoms 100 with a high-strength ANA structure layer, polyurethane condoms 100 with a soft BNB structure layer, and polyurethane condoms 100 with a high-strength CNC structure layer can be obtained respectively. Furthermore, for example, the thickness of the second polyurethane film layer 30 can be the same as the thickness of the first polyurethane film layer 10, for example, 10 μm, 15 μm, or 20 μm. Of course, this is not a limitation.

[0060] The structure of the second film layer 30 may differ from that of the first polyurethane film layer 10. Specifically, for example, the properties of the polyurethane resin in the second polyurethane film layer 30 may differ from those in the first polyurethane film layer 10. For instance, the polyurethane resin in the first polyurethane film layer 10 may be a high-strength polyurethane resin A, and the polyurethane resin in the second polyurethane film layer 30 may be a low-modulus polyurethane resin B. After bonding with the adhesive layer 20, a polyurethane condom 100 with both high strength and a soft ANB structural layer is obtained. The polyurethane resin of the first polyurethane film layer 10 is a high-strength polyurethane resin A, and the polyurethane resin of the second polyurethane film layer 30 is a high-elongation polyurethane resin C. After bonding with the adhesive layer 20, a polyurethane condom 100 with both high strength and high tensile strength (ANC) structural layers is obtained. Alternatively, the polyurethane resin of the first polyurethane film layer 10 can be a low-modulus polyurethane resin B, and the polyurethane resin of the second polyurethane film layer 30 can be a high-burst pressure polyurethane resin E. After bonding with the adhesive layer 20, a polyurethane condom 100 with both high strength and high burst pressure (BNE) structural layers is obtained. This application utilizes the bonding of the adhesive layer 20 to leverage the respective performance advantages of the first polyurethane film layer 10 and the second polyurethane film layer 30, resulting in a polyurethane condom with optimized performance. Furthermore, for example, the thickness of the second polyurethane film layer 30 may be different from the thickness of the first polyurethane film layer 10. For example, the first polyurethane film layer 10 may be 10 μm and the second polyurethane film layer 30 may be 15 μm; or the first polyurethane film layer 10 may be 15 μm and the second polyurethane film layer 30 may be 10 μm. Of course, this is not a limitation.

[0061] In other embodiments, the second film layer 30 is, for example, natural rubber or polyisoprene resin. In some embodiments, the 100% modulus of the second film layer is, for example, less than or equal to 1 N / mm². 2 Furthermore, less than or equal to 0.7 N / mm 2 This results in excellent softness. Through the bonding layer 20, the polyurethane film layer and the natural rubber or polyisoprene resin film layer can be tightly bonded together, thus producing a condom that possesses the properties of both polyurethane resin and natural rubber or polyisoprene resin.

[0062] like Figure 3 As shown, the polyurethane condom 100 with an adhesive layer can form more structural layers. Specifically, the material of the second membrane layer 30 can be selected.

[0063] like Figure 3As shown, this application discloses a specific embodiment of the polyurethane condom 100, which is composed of polyurethane material and natural rubber or polyisoprene, and includes: a first polyurethane film layer 10, a first adhesive layer 21, a second film layer 30, a second adhesive layer 22, and a third polyurethane film layer 40.

[0064] like Figure 3 As shown, the adhesive layer includes a first adhesive layer 21 and a second adhesive layer 22, which are, for example, layers made of the same resin. The first adhesive layer 21 is bonded to both sides with a first polyurethane film layer 10 and a second film layer 30, respectively. The second adhesive layer 22 is bonded to both sides with a second film layer 30 and a third film layer 40, respectively.

[0065] like Figure 3 As shown, the first polyurethane film layer 10, the first adhesive layer 21, the second film layer 30, and the second adhesive layer 22 can, for example, have the same structure as described above. The third film layer 40 is located on the second film layer 20 and has the same structure as the first polyurethane film layer 10. In a specific embodiment, for example, the polyurethane condom 100 has a thickness of 0.010-0.080 mm and does not delaminate after being immersed in an alkaline solution at 50-70°C for 1-10 minutes. The first polyurethane film layer 10 and the third polyurethane film layer 40 have the same structure and a tensile strength greater than or equal to 25 MPa, for example, 35 MPa. The adhesive layers 21 and 22 are made of aliphatic sulfonic acid type waterborne polyurethane resin with a molecular weight of 30000 g / mol and a 100% tensile modulus less than or equal to 2.5 N / mm². 2 For example, 1.8 N / mm 2 The second film layer 30 is polyurethane; the second film layer 30 is polyisoprene resin, and its 100% tensile modulus is less than or equal to 1 N / mm². 2 For example, 0.8 N / mm 2 Of course, this is not a limitation. More structural layers can be formed, such as a three-layer structure of natural rubber or polyisoprene resin layer + adhesive layer + polyurethane film layer, a five-layer structure of natural rubber or polyisoprene resin layer + adhesive layer + polyurethane film layer + adhesive layer + natural rubber or polyisoprene resin layer, a five-layer structure of polyurethane film layer + adhesive layer + natural rubber or polyisoprene resin layer + adhesive layer + polyurethane film layer, etc. It is not limited to this. It should be understood that any structure in which the adhesive layer 20 is used as the middle layer of the polyurethane condom 100 and the film layers on both sides are combined should be covered within the scope of protection claimed in this application.

[0066] like Figure 4 As shown, this application also provides a manufacturing process for the polyurethane condom with an adhesive layer, the manufacturing method including but not limited to the following steps S1 to S4.

[0067] -S1, Impregnate with polyurethane resin and dry to form a first polyurethane film layer;

[0068] -S2, Impregnate the first polyurethane film layer with adhesive material and dry it to form an adhesive layer;

[0069] -S3, Impregnate the adhesive layer with the second film layer material and dry it to form the second film layer;

[0070] -S4, impregnate the second film layer with a release agent, and then dry, demold, and conduct electrical testing to obtain the polyurethane condom with an adhesive layer.

[0071] In steps S1-S4 as described above, a glass mold can be used, and the surface of the glass mold is heated to 20-50°C, for example, 35°C or 40°C, to impregnate it with a first polyurethane resin, and then dried it at 80-120°C, for example, 90°C, 100°C or 110°C; an adhesive layer material is impregnated and dried at 70-110°C, for example, 80°C, 90°C or 100°C; a second film layer material is impregnated and dried at 100-120°C, for example, 110°C; after edge rolling, the polyurethane condom is dried at 100-150°C, for example, 120°C, 135°C or 140°C; a release agent is impregnated and dried at 75-95°C, for example, 78°C, 80°C or 85°C; after demolding, electrical inspection, inner packaging, and outer packaging are performed to obtain the finished polyurethane condom.

[0072] The present application will be described in more detail below with reference to specific embodiments.

[0073] Example

[0074] Example 1

[0075] The raw materials for the composite polyurethane condom include: polyurethane resin with a modulus of 2.5 N / mm². 2 Tensile strength 55 MPa; Adhesive layer: Aliphatic sulfonic acid type waterborne polyurethane resin, modulus 1.0 N / mm² 2 Tensile strength 5 MPa; polyisoprene (PI) resin.

[0076] The glass mold was cleaned, and its surface was heated to 30°C. Polyurethane resin was impregnated to a thickness of 0.013 mm, and dried at 90°C. An adhesive layer was then impregnated to a thickness of 0.002 mm and dried at 80°C. Polyisoprene resin was impregnated to a thickness of 0.015 mm and dried at 100°C. After edge rolling, the product was dried at 120°C, impregnated with a release agent, and dried at 80°C. After demolding, electrical testing, inner packaging, and outer packaging were performed to prepare a polyurethane condom 1 consisting of a polyurethane film layer, a polyurethane film layer, and a polyisoprene film layer. Testing showed that the polyurethane condom 1 had a thickness of 0.03 mm and a 100% modulus of 0.8 N / mm². 2 Burst pressure 2.0 kPa, burst pressure 25 L, tensile strength 40 N / mm 2 No stratification occurs when immersed in a sodium hydroxide solution at 50°C for 1 minute.

[0077] Example 2

[0078] The raw materials for the composite polyurethane condom include: polyurethane resin with a modulus of 2.0 N / mm². 2 Tensile strength 50 MPa; Adhesive layer: Aliphatic sulfonic acid type waterborne polyurethane resin with a modulus of 0.8 N / mm². 2 Tensile strength 3MPa; polyisoprene (PI) resin.

[0079] The glass mold was cleaned, and the mold surface was heated to 40°C. Natural rubber was impregnated to a thickness of 0.010 mm, and dried at 110°C. Then, N was impregnated to a thickness of 0.003 mm and dried at 100°C. Polyurethane resin was impregnated to a thickness of 0.010 mm and dried at 110°C. Again, N was impregnated to a thickness of 0.003 mm and dried at 100°C. Natural rubber was impregnated to a thickness of 0.010 mm and dried at 120°C. After edge rolling, the product was dried at 140°C, impregnated with a release agent, and dried at 80°C. After demolding, electrical inspection, inner packaging, and outer packaging were performed to prepare a polyurethane condom 2 consisting of a natural rubber layer, an adhesive layer, a polyurethane film layer, and another adhesive layer. Testing showed that the polyurethane condom 2 had a thickness of 0.036 mm and a 100% modulus of 0.8 N / mm². 2 Burst pressure 2.0 kPa, burst pressure 30 L, tensile strength 40 N / mm 2 No stratification occurs when immersed in a sodium bicarbonate solution at 60°C for 3 minutes.

[0080] Example 3

[0081] The raw materials for the composite polyurethane condom include: polyurethane resin with a modulus of 1.4 N / mm². 2Tensile strength 40 MPa; Adhesive layer: Aliphatic sulfonic acid type waterborne polyurethane resin, modulus 1.0 N / mm² 2 Tensile strength 5 MPa; polyisoprene (PI) resin.

[0082] The glass mold was cleaned, and the surface was heated to 40°C. It was then impregnated with polyurethane resin to a thickness of 0.013 mm and dried at 110°C; impregnated with N to a thickness of 0.002 mm and dried at 100°C; impregnated with polyisoprene resin to a thickness of 0.010 mm and dried at 110°C; impregnated with N to a thickness of 0.002 mm and dried at 100°C; impregnated with polyurethane resin to a thickness of 0.013 mm and dried at 120°C; impregnated with a release agent and dried at 80°C. After demolding, electrical testing, inner packaging, and outer packaging were performed to prepare a polyurethane condom consisting of a polyurethane film layer, an adhesive layer, a polyisoprene film layer, an adhesive layer, and a polyurethane film layer. Testing showed a thickness of 0.04 mm and a 100% modulus of 1.0 N / mm². 2 Burst pressure 2.6 kPa, burst pressure 20 L, tensile strength 52 N / mm 2 No stratification occurs when soaked in a potassium hydroxide solution at 60°C for 5 minutes.

[0083] The above description is merely a preferred embodiment of this application and is not intended to limit this application. For those skilled in the art, the features in the above embodiments can be combined with each other without conflict, and this application can also have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application. Furthermore, the embodiments should be considered exemplary and non-limiting; the scope of this application is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalent elements of the claims be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A polyurethane condom with an adhesive layer, comprising at least: The first polyurethane film layer is a layer composed of polyurethane resin; An adhesive layer is located on the first polyurethane film layer; The second film layer is located on the adhesive layer; The second film layer is a layer made of natural rubber or polyisoprene resin; The adhesive layer is a layer composed of polar and non-polar components, or a layer composed of a mixture of polar and non-polar components, or a layer composed of a mixture of the polar component, the non-polar component, and the polar-non-polar component; wherein the polar-non-polar component is a polymer material that simultaneously has polar and non-polar groups. The adhesive layer has a thickness of 0.1-30 μm; The adhesive layer has a 100% tensile modulus of less than or equal to 2.5 N / mm². 2 .

2. The polyurethane condom with an adhesive layer as described in claim 1, wherein the burst pressure of the polyurethane condom with an adhesive layer is greater than or equal to 1 kPa, and / or the burst volume is greater than or equal to 5 L.

3. The polyurethane condom with an adhesive layer as described in claim 1, wherein the thickness of the polyurethane condom with the adhesive layer is 0.010-0.080 mm.

4. The polyurethane condom with an adhesive layer as described in claim 1, wherein the polar component is selected from any one or any combination thereof of polyurethane resin, chloroprene rubber, polyvinyl acetate resin, acrylonitrile-butadiene-styrene, vinyl acetate-ethylene copolymer resin, polyacrylate, polyvinyl chloride, protein, starch, cellulose, and epoxy resin.

5. The polyurethane condom with an adhesive layer as described in claim 1, wherein, The adhesive layer is a layer composed of 100% by weight of polar and non-polar components, or a layer composed of 50% by weight of polar components and 50% by weight of non-polar components, or a layer composed of 50% by weight of polar components, 30% by weight of non-polar components, and 20% by weight of polar and non-polar components.

6. The polyurethane condom with an adhesive layer as claimed in claim 1, wherein the non-polar component is selected from one or any combination thereof of natural rubber, polyolefins, silicone resins, butyl rubber, styrene-butadiene rubber, ethylene propylene diene monomer (EPDM) rubber, polystyrene, polyisoprene, polyesters, rosin resins, terpene resins, rosin resins and their derivatives.

7. The polyurethane condom with an adhesive layer as claimed in claim 1, wherein the polar-nonpolar component is selected from organically modified polar or nonpolar polymer materials.

8. The polyurethane condom with an adhesive layer as claimed in claim 1, wherein the adhesive layer comprises at least one layer.

9. The polyurethane condom with an adhesive layer as claimed in claim 1, wherein the second film layer has a 100% modulus of less than or equal to 1 N / mm². 2 .

10. A method for preparing a polyurethane condom with an adhesive layer, comprising at least the following steps: Impregnate with polyurethane resin and dry to form a first polyurethane film layer; An adhesive layer material is impregnated onto the first polyurethane film layer and dried to form an adhesive layer; The second film layer material is impregnated onto the adhesive layer and dried to form the second film layer; the second film layer is a layer made of natural rubber or polyisoprene resin. The second film layer is impregnated with a release agent, and then dried, demolded, and electrically tested to obtain the polyurethane condom with an adhesive layer; The adhesive layer is a layer composed of polar and non-polar components, or a layer composed of a mixture of polar and non-polar components, or a layer composed of the polar component, the non-polar component, and the polar-non-polar component; wherein the polar-non-polar component is a polymer material that simultaneously has polar and non-polar groups. The adhesive layer has a 100% tensile modulus of less than or equal to 2.5 N / mm². 2 ; The adhesive layer has a thickness of 0.1-30 μm.

11. The method for preparing a polyurethane condom with an adhesive layer as described in claim 10, wherein the impregnation is performed by impregnating polyurethane resin through a mold, the mold being composed of glass or a thermoplastic polymer.

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