MXPA00011019A - Composite consisting of a coated polycarbonate and a polymer - Google Patents

Abstract

The invention relates to an interlocking composite made up of a surface-coated shaped body consisting of polycarbonate (1), said shaped body having special geometrical characteristics (2) in the edge area which promote adherence;and a polymer. The invention also relates to the production of said interlocking composite and to products which can be produced from the same.

Description

COMPOSITE MATERIAL THAT CONSISTS OF A COATED POLYCARBONATE AND A POLYMER The present invention relates to a structure of a composite material comprising a shaped polycarbonate article, the surface of which was coated and having a geometric characteristic that promotes adhesion in the edge region, and a polymer; the production of the structure of the composite material; the use of it for the production of products; and the products produced from it.

The replacement of glass by polycarbonate has progressed more and more, especially in areas where glass is a disadvantage for its weight and / or its susceptibility to fracture.

Polycarbonate, which can be used as a substitute glass, must be coated in such a way that it is both resistant to cracking and resistant to other environmental influences. However, such a polycarbonate coating has as a rule the result that the polycarbonate must not undergo a chemical or physical bond with other polymers, so that a structure of composite material No. 124555, where another polymer adheres firmly to the coated polycarbonate is not generally possible without the aid of the connecting means, such as, for example, screws. The object of the present invention is therefore to provide a structure of the composite material comprising a shaped polycarbonate article, the surface of which is coated, and a polymer, wherein the composite material has a firm structure without necessity by a means of connection, such as for example screws; a process for the production of a composite material according to the invention; and products that are produced from it.

The objective according to the invention was achieved by means of a structure of the composite material comprising a shaped polycarbonate article, the surface of which was coated and which has a geometric characteristic that promotes adhesion in the edge region, and a polymer, which is obtainable by means of injection molding or casting the polymer around the article formed in the edge region; a process for the production of the composite material according to the invention by means of injection molded or molded material around the shaped polycarbonate article in the edge region; the use of it for the production of products; and the products thus obtainable.

The compound according to the invention has the advantage that there is the cooperation of the structure between the coated shaped polycarbonate article, and the polymer, although the shaped article and the polymer in neither of them undergo a chemical or physical bonding. The physical link means, for example, a particularly firm adhesion.

The polycarbonates in the context of the present invention are both homopolycarbonates and copolycarbonates. The polycarbonates can be linear or branched. The homopolycarbonate based on bisphenol A (2, 2-bis- (4-hydroxyphenyl) -propane) or the copolycarbonate based on bisphenol A and above 60% mol, based on the molar sum of bisphenols, 1,1-bis- (4-hydroxyphenyl) 3, 3, 5-trimethylcyclohexane is preferably used. The homopolycarbonate based on bisphenol A is particularly preferably used.

The polycarbonates in the context of the present invention are also those aromatic polycarbonates in which are up to 80 mol%, preferably from 20 mol% to 50 mol%, of the carbonate groups are replaced by means of ester groups of dicarboxylic acid. Such polycarbonates, which contain both acidic carbonic acid radicals and acidic dicarboxylic acid radicals incorporated within the molecular chain, are called aromatic polyester carbonates. they are summarized under the generic term polycarbonates.

The polycarbonates can be prepared by means of known processes. The reference by means of the example was made alone - here in Schnell, Chemistry of Physics of Polycarbonates, Polymer Reviews, volume 9, Interscience Publishers, New York, London, Sydney 1964, and in D.C. Prevorsek, B.T. Debona and Y. Resten, Corporate Research Center, Allied Chemical Corporation, Morristown, New Jersey 07960, "Synthesis of Poly (ester-carbonate) copolymers" in Journal of Polymers Science, Polymer Chemistry Edition, vol. 19, 75-90 (1980), and in D. Freitag, U. Grigo, P.R. Müller, N. Nouvertne, BAYER AG, "Polycarbonates" in the Encyclopaedia of Polymer Science and Engineering, volume 11, 1988, second edition, 1988 pages 648-718 and finally in U. Grigo, K. Kircher and P.R. M [uller, "Polycarbonate" in Becker, Braun, Kunststoff-Hanbuch. Volume 3/1, Polycarbonate, Polyacetale, Polyester, Celluloeester, Car Hanser Verlag Munich, Vienna, 1992, pages 117-229.

The polycarbonates according to the invention have average molecular weights M w of 12,000 to 400,000 g / mol (determined by measuring the relative viscosity of a methylene chloride solution having a concentration of 0.5 g of polycarbonate per 10 ml of methylene chloride a 25 ° C), preferably from 18,000 to 80,000 g / mol, and is particularly from 22,000 to 60,000 g / mol.

The polycarbonates according to the invention can comprise additives.

The coating in the context of the invention means that the shaped polycarbonate article was supplied with a cracking-resistant coating surface that is also chemical resistant and optionally UV absorbing, and may additionally have hydrophilic or hydrophobic properties. Preferably, more than 50% of the edge region of the article formed according to the invention of polycarbonate was coated. Particularly preferably, more than 75% of the edge region was coated.

All coatings known to the skilled person which generate the cracking-resistant polycarbonate such that it has a surface structure similar to that of glass can be employed as the surface coating. A surface coating as described in WO 95/13 426 is preferably used.

The composite material according to the present invention was achieved by means of injection molding or casting a polymer around the article formed in the edge region. The polymers in the context of the invention include all thermoplastics, and also rubber-like polymers (rubbers), such as were used for example as a sealant composition, or else thermosensitive polymers. The mixtures of the mentioned polymers can also be used.

The composite material according to the invention is preferably produced by injection molding the thermoplastics around the shaped article.

Examples of thermoplastics that may be mentioned are polystyrene, polyurethane, polyamide, polyester, polyacetal, polyacrylate, polycarbonate, polyethylene, polypropylene, polyvinyl chloride, polystyrene / acrylonitrile and copolymers based on the aforementioned polymers and mixtures of polymers or polymers. copolymers mentioned with another or with other polymers.

Rubber-like polymers in the context of the invention are for example polyisoprene, polychloroprene, styrene / butadiene rubber, rubber-like ABS polymers and ethylene copolymers and one or more of the following compounds: vinyl acetate, esters of Acrylic acid, esters of methacrylic acid or propylene.

Casting resins, such as for example unsaturated polyesters, epoxide resin compositions, acrylates, formaldehyde resins or polyurethanes, can also be used as polymers in the context of the invention.

Thermoplastics, rubbers and thermosensitive resins which can be used according to the invention are listed, for example, in Saechtling,, Kunststoff-Taschenbuch, edition 26, Carl Hanser Verlag, Munich, Vienna, 1995 and in Vieweg and Braun, Kunststoff-Handbuch, Cari Hanser Verlag Munich, Vienna, 1995, and in Becker, Braun, Kunststoff-Handbuch, Carl Hanser Verlag Munich, Vienna, 1992.

The polymers according to the invention may comprise additives.

The composite material according to the invention is preferably produced by the thermoplastics molded by injection around the shaped article.

The shaped polycarbonate article is preferably a sheet or a film. The sheet can be either flat or curved. The curved in the context of the invention means that the sheet is curved as it has a particular shape, for example as. It is required in automotive construction in the form of a front windshield or rear windshield, or as a skylight in the construction of the house. The sheet preferably has a thickness of 1 mm to 3 cm, particularly preferably 3 mm to 10 mm. The film preferably has a thickness of at least 0.25 to 1 mm.

In another preferred embodiment of the invention, the shaped article has a curved surface, such as occurs in particular in optical lenses.

The shaped article preferably has a geometric characteristic that promotes adhesion in the region of the edge, one or more circular or oval recesses or holes or indentations or shell valve or without stamping or semi-stamping or corrugations, which are wrapped when the polymer It is molded by injection or casting around the shaped article, so that a firm connection results between the shaped article and the polymer.

A preferred embodiment of the invention is a structure of the bisphenol A based composite material, the surface of which is coated, and a thermoplastic; the production and use of it; and products produced from it.

The edge region preferably comprises at least 20% of the total area of the surface of the article formed according to the invention of the polycarbonate. This particularly preferably comprises at least 10%. The edge region is understood as, for example, the surface, near the edge of a sheet. In the case of formed articles that do not have a clear edge, such as for example a sphere, the region of the edge is a part chosen arbitrarily from the surface of the shaped article.

The composite material according to the invention is suitable for the production of several products. The composite material according to the invention is particularly suitable for the production of forged objects, such as for example sliding frames.

The compound according to the invention is also particularly suitable for the production of the polycarbonate window glasses, either the seal or even the entire frame was attached to the coated polycarbonate glass by an injection molding operation.

The compound according to the invention is also particularly suitable for the production of car headlights. In this case, for example, the lens of the headlights can be formed by a polycarbonate article shaped according to the invention.

Another preferred use of the compound according to the invention is the production of paint frames, wherein the polycarbonate sheet can also be supplied with an anti-reflective coating.

The composite material according to the invention is preferably also used for the production of a glaze for motor vehicles.

Another preferred use is the screen production in all types of plastic housings, namely screens for computers and portable telephones. The screen of the televisions can also be produced from the composite material according to the invention.

The invention is explained below with the help of FIGS. 1 to 3. These explanations are merely by way of example and therefore do not limit the invention. Figure 1 shows a polycarbonate film with perforations in the edge region. Figure 2 shows a polycarbonate film with holes in the edge region. Figure 3 shows a polycarbonate film with indentations in the edge region.

Figure 4 shows a polycarbonate film with semi-embossing in the edge region.

Fig. 1 shows a thickness of 0.8 mm of coated polycarbonate film that was delivered with 16 perforations in the edge region. A thermoplastic (for example) was injection molded around this film in the region of the edge in such a way that a sliding frame is formed. During injection molding around the film, the thermoplastic material penetrates into the voids, so that a structurally firm composite material is formed. The number and diameter of holes depends on the forces acting between the film and the frames, for example the force, that the composite material must make.

Fig. 2 shows a polycarbonate sheet coated with a thickness of 5 mm having slanted indentations in the edge region 6. The indentations were emptied into the sheet. The indentations are filled when a thermoplastic material when this is injection molded around the polycarbonate sheet, so as to form a structurally firm connection between the thermoplastic material and the sheet. This type of composite material is particularly suitable for glazing.

Fig. 3 shows the section through a polycarbonate film. Film 1 has indentations or recesses 2 in the edge region that are incorporated into the film with a rough tool. When the thermoplastic material is injection molded around the film, it encloses the indentations or recesses and thus produces the structurally firm composite material.

Fig. 4 shows the perspective view of a polycarbonate film with stamping medium in the edge region. A segment 3, for example circular, was not partially stamped out of the sheet and bent outwardly during the stamping. When a thermoplastic material is injection molded around the sheet, it encloses the protection, approximately on the circular disk 4 and thus produces the structurally firm composite material.

It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.

Having described the invention as above, property is claimed as contained in the following:

Claims (16)

1. - A structure of composite material characterized in that it comprises a shaped polycarbonate article, the surface of which is coated and has a geometric characteristic that promotes adhesion in the edge region, and a polymer, which is obtainable by injection molding or emptying the polymer around the shaped article in the edge region.

2. - A composite material according to claim 1, characterized in that the formed polycarbonate article is a flat or curved sheet or film.

3. - A compound according to claim 1 or 2, characterized in that the geometric characteristic that promotes adhesion was selected from the group comprising voids, indentations, notches, stamping, semi-stamping or corrugations.

4. - A composite material according to one of claims 1 to 3, characterized in that the polymer is a thermoplastic.

5. - A composite material according to one of claims 1 to 4, characterized in that the polycarbonate has a surface coating resistant to cracking.

6. - A process for the production of a structure of composite material characterized in that it comprises a shaped polycarbonate article, the surface of which was coated and having a geometric characteristic that promotes adhesion in the edge region, and a polymer, by means of the molding by injection or pouring the material around the shaped polycarbonate article in the edge region.

7. - The use of the compound according to one of claims 1 to 5, characterized in that it is used for the production of products.

8. The use of the compound according to one of claims 1 to 5, characterized in that it is used for the production of sliding frames or painting frames.

9. - The use of the compound according to one of claims 1 to 5, characterized in that it is used for the production of windows with a seal or windows with frames.

10. The use of the compound according to one of claims 1 to 5, characterized in that it is used for the production of glazing for motor vehicles.

11. The use of the compound according to one of claims 1 to 5, characterized in that it is used for the production of screens in a plastic housing.

12. - A product characterized in that it is obtainable from a compound according to one of claims 1 to 5.

13. - A painting frame or a sliding frame characterized in that it is obtainable from a compound according to one of claims 1 to 5.

14. - A window having a seal or a frame characterized in that it is obtainable from a compound according to one of claims 1 to 5.

15. - A glaze for a motor vehicle characterized in that it is obtainable from a composite material according to one of claims 1 to 5.

16. - A screen in a plastic housing characterized in that it is obtainable from a composite material according to one of claims 1 to 5.