DE1955853A1 - Glass and plastic film - Google Patents

Description

KALLE AKTIENGESELLSCHAFT 1955353 Our Zeldien day sheet K 1919 / Gbm 418 ¹ PP-Dr.Kn-df October 31, 1969

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KALLE AKTIENGESELLSCHAFT Wiesbaden-Biebrich

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Foil made of glass and plastic

The invention relates to a flexible film made of thin glass and plastic, in which certain favorable material properties of the glass with outstanding properties of

Plastic foils are combined and a process for the manufacture such a composite.

The manufacture of glass-plastic composites has long been · » known. This is how glass fibers are processed in plastic melts, to give the plastic certain mechanical properties, for example improvement of the slip. Further glass-plastic composites are, for example, glass fiber reinforced plastic parts or the known ones

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KALLE AKTIENGESELLSCHAFT 1955853 Our sign day sheet K 19IQ / GbM Hl8 ¹ PP-Dr.Kn-df 31.10.69 * "

Safety glasses in which a plastic layer is embedded between glass plates in order to protect against damage avoid strong fragmentation.

In recent times it has been possible to produce foils made of glass with a thickness of up to about 5 / um in the form of sheets or plates, which are characterized by great flexibility, but which have the disadvantage of brittleness and low impact resistance adheres. The plastics industry also produces foils with a thickness in the range from 1 to 2 μm.

However, the combinations of glass and plastics already mentioned are either rigid products or the total proportion of glass in fiber or powder form with respect to the plastic is deliberately kept low, because yes only the plastic film should have certain properties. The thin glass films have the significant disadvantage that they are very easily destroyed, while various plastic films, for example, have the shortcomings that they are gas or vapor permeable or, especially under the influence of heat, completely for some purposes insufficient · have dimensional stability.

It was now the task of the invention to create a composite material

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| (a11e | KALLE AKTIENGESELLSCHAFT 1955853

Our sign day sheet K 1919 / Gbm 418 ¹ PP-Dr.Kn-df 31.10.69 %

to create its preferred properties in a very good dimensional stability even under the influence of heat, in the impermeability to oasis and vapors as well as in a good flexibility without the risk of destruction should lie. In addition, it should not be subject to any irreversible changes due to moderate exposure to heat.

The above-mentioned object is surprisingly achieved by a composite material consisting of a glass coated with plastic on one or both sides, which is characterized in that the composite consists of a glass film with a thickness of 4 to 200 μm and a plastic layer applied to one or both sides Thickness of 2 to 200 _/ um and has a high flexibility.

The composite film according to the invention has properties which do not have the disadvantages of pure glass or plastic films. The new material surprisingly has a dimensional stability that, despite the plastic layer, no longer or hardly noticeably deviates from that of pure glass (glass between OM to 1.0 · 10 " ^{5 0} C * ¹ ; for plastic, for example in the form of polyterephthalic acid esters, the coefficient is between about 1.7 x 10 " ⁵ to 2.7 x 10" ^{5 °} C " ¹ ). Irreversible changes under the

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1IeI kalle Aktiengesellschaft 1955853

Our sign day sheet

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flow of usual temperature fluctuations are also not to watch. After heating, the composite material returns completely to its original dimensions.

Another advantage of the composite film compared to pure plastic films is that it is absolutely impermeable to Vapors and gases and great flexibility. On the other hand, there is the serious one with the composite film The disadvantage of the easy destructibility of the thin glass films is eliminated.

In a preferred embodiment, the glass sheet of the composite has a thickness of 20 to 100 _/ um and the plastic film has a thickness of 10 to 100 _{/ To,} in particular 20 ° to 5 ° / .mu.m.

Even if the glass film is covered with a plastic film on both sides, these are fundamentally different Can have thicknesses, so it has proven to be advantageous in practice if the two plastic films have the same strength and are also made of the same material.

For the production of the composite material are basically

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KALLE AKTIENGESELLSCHAFT 1955853

Our Zeldien day sheet

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all plastics can be used, either by extrusion, as films with a suitable adhesive, for example a polyurethane adhesive, using adhesion promoters, such as isocyanates or in the form of dispersion or solvent coating, if appropriate using adhesion promoters, connected to the glass film can be. These include, for example, polyolefins, polyvinyl chloride, polyamides, polyvinylidene chloride, regenerated cellulose hydrates, acetates, polystyrene or also mixed or copolymers of the compounds mentioned. Because of their particularly good mechanical strength in a preferred embodiment, however, polyester, in particular polyterephthalic acid ester, is used. Above all, a network the glass film with mono- or biaxially stretched films has proven particularly useful.

For some purposes, for example to make the composite material for the production of moldings, e.g. packaging, sealable or to make it weldable, the use has of common plastic composite films, for example from

Polyester-polyethylene, tried and tested for coating the glass. For many purposes it is not necessary to

that the plastic layer has a particularly low heat

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KALLE AKTIENGESELLSCHAFT 1955853

Our sign day sheet

K 1919 / Gbm 418 ¹ PP-Dr.Kn-df 10/31/69 V

fr

Has expansion coefficients, however, for example, when using the composite as a drawing film, the lowest possible coefficient of thermal expansion is desirable. For such areas of application, composite films are produced whose overall coefficient of thermal expansion preferably has a value of less than ΙΟ * ² * ⁰ C ¹ .

The invention also relates to a method for producing the composite material. The distinguishing features of the procedure consist in that one or both sides of a glass film with a thickness of 4 to 200 .mu.m is preferred one from 20 to 100 μm, either a plastic layer from 2 to 200 μm, preferably from 10 to 100 μm, in particular, however, from 20 to 50 μm, extruded or an adhesive layer from 1 to 10 ^ µm, preferably from 2 to 5, um, and / or «inen adhesion promoter applies and prefabricated plastic films of the strength specified above, which optionally provided on one side with an adhesive layer of the specified thickness and / or with an adhesion promoter are, optionally with the application of heat, or a dispersion of the plastic, optionally applying using an adhesion promoter and the Bond until it is fixed and, if necessary, then to formats.

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KALLE AKTIENGESELLSCHAFT 1955853

Our sign day sheet

K 1919 / Gbm 418 ¹ . PP-Dr.Kn-df 31.10.69 «Γ

The plastic is extruded on by means of known devices, in particular slot nozzles, preferably for continuous operation, the extrusion is carried out on moving glass film webs. Here Adhesion-promoting layers can be applied to the glass film at the same time prior to extrusion.

When producing the composite material by gluing or using adhesion promoters The application of adhesive and / or adhesion promoter is carried out by means of known devices when laminating plastic foils made, with a continuous mode of operation for connecting the glass film with the plastic film of the role is preferred over a cyclical process. The dispersion or solvent coating, known measures are used, for example, using mixed or copolymers of plastics.

In some cases it has proven to be useful to use the composite material to thermostabilize the plastic reheated again. Another advantage of the thin composite films is that they are easy to calibrate Let the application of heat permanently deform and thus certain shaped bodies can be produced, e.g. have a permanent tendency to curl.

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KALLE AKTIENGESELLSCHAFT 1955853 Our Zeldien day sheet

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Because of their excellent dimensional stability even in terms of temperature the composite films according to the invention have proven to be extremely dimensionally accurate, especially as drawing films for production Reproductions proven. While with the previous drawing foils again and again, especially after one Storage in the heat, irreversible dimensional changes associated with considerable deviations in the reproductions occurred, for example in plans to manufacture precision devices or in cartography led to considerable difficulties, such defects no longer occur with the new composite films. Likewise Printing plates, in which these composite foils serve as the base material, have very high dimensional accuracy.

Another preferred option is to use it as To mention gas and vapor impermeable film for packaging purposes. For example, from the composite material sealable flat bags or other shaped bodies - because of the favorable bending radius, e.g. in a round shape - can be produced. The film is especially good for packaging goods that dry out easily or lose their aroma proven. With this material it is possible for the first time

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jCAlllE] KALLE AKTIENGESELLSCHAFT 1955853

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To create small, tape-like packaging that is just as perfect Like the well-known plastic-aluminum composites, they are impermeable. However, the transparency is retained; one for many purposes of sale, or even for Rule out τοη errors about the content, an extremely desirable property.

Another possible application is to use it as a transparent, slightly supple protective cover for Objects from the harmful influence τοη moisture and / or gases need to be protected. For example, valuable pictures can be covered with such a cover will.

The above-mentioned possible uses are only exemplary and do not represent any restrictions in the use of the composite material according to the invention.

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JCAHe] KALLE AKTIENGESELLSCHAFT 1955853 Our sign day sheet K 1919 / Gbm »I8 ¹ FP-Dr.Kn-df 31.10.69 * 6 Examples :

1. A polyethylene terephthalate film with a thickness of 50 μm was extruded onto both sides of a moving glass film (coefficient of thermal expansion at 100 ° C. 0.107 · 10 "* ⁰ C ^{-1) of 100 μm from a slot die} are cm curved "without the glass was destroyed. an attempt to create a glass film of 100 / to bring to the same bending radius failed because the film buckled and thereby broke. the composite had a Gesamtwärneausdehnungskoeffizienten between 20 and 50 © _{0 o} .ii3 · 10 "* ⁰ C" ^1. Irreversible changes, such as those that occurred with the pure plastic film when heated, for example, to 90 ° C., were not observed. The composite material was absolutely impermeable to all gases and vapors.

2. A low-pressure polyethylene film was placed on both sides of a moving film of 50 .mu.m of the glass according to Example 1 ▼ on 20 / u * extruded on. The properties of the composite material corresponded to the values of Example 1.

3. On a film of the glass according to Example 1 of 20 .um was by means of an application device on both sides 2 / around an adhesive »

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Our characters day Bl K 1919 / Obm »I8 ¹ PP-Dr.Kn-df 31.10.69 3Ä

(ISARFLAST L 517) applied. Then the glass sheet on both sides with biaxially stretched polyethylene tere-

2 phthalate film and pressed together under a pressure of 20 kg / approx. The films at 80 ° C for 2 minutes. After two hours of thermal aftertreatment at 90 ⁰ C, a total thermal expansion coefficient between 20 and 50 ° C was τοη 0.110 · 10 "** ⁰ C" ¹ measured. The composite was absolutely impermeable to gas and vapor. Irreversible changes due to the influence of heat did not occur.

4. On a stationary glass sheet of 150 ^ u _n (thermal expansion coefficient of 0.88 x 10 ^{"5 0} C" ¹⁾ was obtained on both sides by respective six-time application of a conventional dispersion of polyvinylidene chloride and subsequent drying at 130 ° C air temperature, a plastic layer of 30 um. The total coefficient of thermal expansion between 20 and 50 ° C. was 0.93 · 10 ~ ⁵ ° C. " ^1. The other properties of the composite material corresponded to those described above.

5. A composite was prepared as in Example 1 but the material was nacherhitxt 3 hours at 90 ⁰ C. The business

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KALLE AKTIENGESELLSCHAFT 1955853 Our sign day sheet K 1919 / Qbm »I8 ¹ FP-Dr.Kn-df 31.10.69

total thermal expansion coefficient was now 0.112

6. In a stationary glass sheet (thermal expansion coefficient O.85 * 10 * 5 ⁰ C ^"1) from 50 to has on both sides a Weichpolyvinylchloridfolie of 80 ^ un according to Example 3 using the adhesive TEROKAL laminated 2183 H. The Herge · presented composite was bent into a tube and welded using high-frequency welding.

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Claims (17)

KALLE AKTIENGESELLSCHAFT 1955853 Our sign day sheet K 1919 / Utility Model 418 ¹ FP Dr.Kn-df 3I.IO.69 VÜ Claims Composite material consisting of glass coated on one or both sides with plastic, characterized in that the composite consists of a glass film with a thickness γόη 4 to 200 _{/ μm and a} plastic layer applied on one or both sides with a thickness τοη 2 to 200 / μm and has great flexibility owns. 2. Composite material according to claim 1, characterized in that the glass film has a thickness of 20 to 100 ^ µm. 3. Composite material according to one of claims 1 or 2, characterized in that the plastic layer is a Has a thickness of 10 to 100 µm. 4. Composite material according to one of claims 1 or 2, characterized in that the plastic layer has a thickness of 20 to 50 µm. 5. Composite material according to one of claims 1 to M, characterized characterized in that the plastic layers have the same thickness with double-sided occupancy. 109820/1779 KALLE AKTIENGESELLSCHAFT 1955853 Our sign day sheet K 1919 / QbM 418 ^τ PP-Dr.Kn-df 31.10.69 ff 6. Composite material according to one of claims 1 to 5, characterized in that the plastic layer is a Polyester, preferably a polyterephthalic acid ester film is. 7. Composite material according to one of claims 1 to 6, characterized in that it has a total coefficient of thermal expansion in the plane of less than 10 "* ⁰ C" ¹ . 8. Composite material according to one of claims 1 to 7, characterized in that between the glass film and an adhesive layer of 1 to 10 μm, preferably 2 to 5 μm, is attached to the plastic. 9. Composite material according to one of claims 1 to 8, characterized in that between the glass film and the plastic has an adhesion promoter. 10. A method for producing the composite material according to any one of claims 1 to 7, characterized in that 109820/1779 KALLE AKTIENGESELLSCHAFT 1955853 Our sign day sheet K 1919 / Otm 118 ¹ PP-Dr.Kn-af 31.10.69 ί that one on a glass sheet of 4 to 200 .um, is preferred from 20 to 100 .mu.m, in particular in continuous operation, a plastic layer on one or both sides in a thickness of from 2 to 200 μm, preferably from 10 to 100 μm, in particular from 20 to 50 μm or by means of dispersion or solvent coating applies, the composite is fixed until it solidifies and, if necessary, then cuts. ^v 11. A method for producing a composite material according to claim 10, characterized in that one daft before Applying the plastic layer applies an adhesion promoter. 12. A method for producing a composite material according to any one of claims 1 to 8, characterized in that one or both sides and / or on a prefabricated glass film from 4 to 200 .mu.m, Λ preferably from 20 to 100 .mu.m Plastic film from 2 to 200 _{/ including>} preferably from 10 to 100 ^ um, in particular from 20 to 50 .mu.m, one-sided, preferably continuously Mode of operation, an adhesive layer of 1 to 10 µm, preferred from 2 to 5 .mu.m, the films are pressed together, optionally with the application of heat, the 109820/1779 KALLE AKTIENGESELLSCHAFT 1955853 Our signs tag 'sheet K 1919 / Gbm 418 ¹ FP-Dr.Kn-df 31.10.69 Composite material fixed until it solidifies and if necessary then cuts. 13. The method according to claim 12, characterized in that before applying the adhesive layer and / or the plastic film on the glass film and / or the plastic film applies an adhesion promoter. 14. The method according to any one of claims 10 to 13, characterized in that the composite material for thermal stabilization of the plastic is reheated. 15. The method according to any one of claims 10 to 14, characterized in that the composite material under the action of temperature permanently deformed. 16. Use of a composite material according to one of claims 1 to 15 as a dimensionally stable drawing film or as the basis for a printing plate. 17. Use of a composite material according to one of claims 1 to 15 as gas and vapor impermeable Film for packaging purposes. 109820/1779 KALLE AKTIENGESELLSCHAFT 1955853 Our sign day sheet K 1919 / Qbffl M18 ¹ PP-Dr.Kn-df 31.10.69 Use of a composite material according to one of the claims 1 to 15 as a transparent protective cover, e.g. for pictures. 109820/1779