PT118084B - INSULATING HOLLOW PROFILE FOR ALUMINUM FRAMES, ALUMINUM FRAMES INCLUDING SAID INSULATING HOLLOW PROFILE AND ALUMINUM WINDOW OR DOOR PRODUCTION PROCESS - Google Patents

Abstract

THE PRESENT INVENTION REFERS TO AN INSULATING HOLLOW PROFILE FOR APPLICATION IN ALUMINUM FRAMES. THE INSULATING PROFILE CONSISTS OF A COMPOSITE COMPRISING 75% TO 85% BY WEIGHT OF POLYPROPYLENE AND 15% TO 25% BY WEIGHT OF CORK GRANULATES. THE INVENTION ALSO REFERS TO ALUMINUM FRAMES INCLUDING THE SAID HOLLOW INSULATING PROFILE AND TO WINDOWS OR DOORS PRODUCED WITH SUCH FRAMES, AS WELL AS THEIR PRODUCTION PROCESS. THE INVENTION IS LOCATED IN THE FIELD OF CONSTRUCTION, PARTICULARLY IN THE INDUSTRIAL PRODUCTION OF ALUMINUM WINDOWS OR DOORS.

Description

DESCRIPTION

INSULATING HOLLOW PROFILE FOR ALUMINUM FRAMES, ALUMINUM FRAMES INCLUDING SAID INSULATING HOLLOW PROFILE AND ALUMINUM WINDOW OR DOOR PRODUCTION PROCESS

FIELD OF INVENTION

The present invention relates to a hollow insulating profile, for application in aluminum frames, said hollow insulating profile being formed from the extrusion of a composite of polypropylene and cork granulate. The invention further relates to an aluminum frame comprising said insulating hollow profile, as well as to aluminum windows and doors comprising such frames and their production process. The invention has application in the field of construction, in particular in the industrial production of aluminum windows or doors.

BACKGROUND OF THE INVENTION The market for frames is quite competitive and increasingly requires very high quality levels that include not only standardized, high-performance construction requirements, but also compliance with increasing ecological suitability requirements, particularly with regard to use of biodegradable materials.

In fact, in the industry of aluminum frames for windows and doors, there has been a growing demand, in terms of research and development, for solutions that avoid or limit the use of petroleum-derived products, without compromising the demanding technical performance requirements adopted. in the industry.

Specifically, the thermal and acoustic insulation elements, used in the aluminum frames of windows and doors, essential for their good thermal and acoustic performance, constitute a clear example that provides an opportunity to improve the relationship between technical performance and the growing concerns of ecological suitability.

In fact, in the current state of the art, thermal and acoustic insulation elements or profiles for aluminum frames have been manufactured essentially from glass fiber reinforced polyamide, with proven efficiency from a thermal and acoustic point of view, although at environmental expense. significant.

Despite the efforts made to alter or replace these insulation elements with others made of more sustainable materials, experts have been faced with difficulties in obtaining new alternative solutions that meet the necessary technical requirements essential for adequate performance, particularly with regard to refers to:

• Adequacy or ease of adaptation of current production processes for insulation elements or profiles, particularly by extrusion, to other more sustainable materials;

• mechanical resistance, in particular tensile strength of new insulation elements or profiles;

• fixing insulation elements or profiles to aluminum profiles;

• thermal and acoustic performance of insulation elements or profiles;

• performance in terms of air permeability, water tightness and wind resistance of windows or doors produced from frames insulated with insulation elements or profiles; and • durability of the insulation provided by the insulation elements or profiles.

On the other hand, the economic viability of industrial production processes for new insulation elements or profiles constitutes a very restrictive factor in the replacement of current insulation elements.

The difficulty in overcoming all the problems listed above has led the industrial production sector of aluminum windows or doors to relative stagnation with regard to the development and improvement of their thermal and acoustic insulation elements.

Some attempts to look for alternative solutions and materials for frame insulation elements can be found, for example, in the patent documents identified below.

document EP3228793(BI), entitled METHOD FOR

IMPLEMENTING A FRAME AND FRAME THUS OBTAINED discloses a method for producing a structure (1) including an opening (AA ¹ BB' ), referred to as window free space, the structure being formed by two complementary half profiles (2, 3), respectively internal (INT) and external (EXT), arranged in opposition to each other and maintained, one against the other, by means of fixation, delimiting between them a space (V) of closed volume. The volume space receives cork as an insulation material, in particular expanded cork.

document EP1589179(B1), entitled Frame section member to be fixed on a support and corresponding door or window discloses a section (100; 200; 301, 302) of structure to be fixed on a support (210; 311, 321), in particular a window or door frame, the structural section (100; 200; 301,302) having a layer of glass profiled as a layer of glass (102; 202; 315,325), such that the section structure has a profiled part (101; 201; 313, 323) on which the profiled glass layer (102; 202; 315, 325) is mounted, the profiled part (101; 201; 313, 323) comprising a material that , in relation to its thermal properties, is adapted to the material of the profiled glass layer (102; 202; 315, 325) and has a silicate as a substantial constituent and in which the profiled part (101; 201; 313, 323) is formed from foam glass, rigid foam or cork.

Document EP3889384 (Al) entitled EXTRUDED WINDOW OR DOOR HOLLOW SECTION PROFILE, SYSTEM WITH SUCH A HOLLOW SECTION PROFILE AND FRAME MADE FROM SAME discloses an extruded hollow section profile of a window or door (1) with at least one fixing area (4) to fix the hollow section profile (1) or to connect the hollow chamber profile (1) to an external component (3), the fixing area (4) of which is designed and provided to receive a fixing means ( 2) edge-profiled, the hollow section profile (1) of which has at least one fixing channel (5) in the fixing region (4) that is oriented perpendicular to a longitudinal extrusion direction (6) of the hollow section profile ( 1), whose fixing channel (8) has a longitudinal channel axis (7), is closed at its ends perpendicular to the longitudinal channel axis (7) by an outer wall (la, 1b) of the hollow section profile (1 ).

There is therefore a need in the art to develop new thermal and acoustic insulation elements or profiles for aluminum door or window frames, which can constitute more ecological and productively more sustainable alternatives than the current polyamide-based insulation elements currently disseminated in the technique.

It is also necessary that such insulation elements or profiles simultaneously meet the demanding technical requirements required and standardized in the industry.

BRIEF DESCRIPTION OF THE DRAWINGS

Below is a detailed description of the invention with reference to the attached drawings, in which:

Fig. 1 schematically illustrates the rectangular section of an embodiment of an extruded hollow insulating profile of the invention.

Ά Fig. 2 schematically illustrates a complex cross-section of another embodiment of an extruded hollow insulating profile of the invention.

Fig. 3 illustrates the final geometry section of an aluminum window with glass, shims and the hollow insulating profile shown in Fig. 2 applied.

SUMMARY OF THE INVENTION

The present invention relates to a hollow insulating profile for aluminum frames, said insulating profile characterized in that it comprises a composite comprising 75% to 85% by weight of polypropylene and 15% to 25% by weight of cork granulate, of a preferably comprising 80% by weight of polypropylene and 20% by weight of cork granulate.

In one embodiment, the cork granulate of said composite has a density of between 50 and 60 kg/m ³ and a particle size of between 0.05 and 3 mm, preferably between 0.5 and 2 mm, in a most preferred between 1 and 2 mm.

Preferably, the polypropylene of said composite comprises a melt flow index comprised between 10g/10min and 14g/10min, a softening temperature comprised between 145°C and 160°C and a thermal deflection temperature comprised between 75°C and 90°C, more preferably comprises a flow index of 12g/10min, a softening temperature of 153°C and a thermal deflection temperature of 82°C.

The present invention further relates to an aluminum frame comprising hollow aluminum profiled elements and hollow insulating profiles, formed from a composite comprising 75% to 85% by weight of polypropylene and 15% to 25% by weight of polypropylene granulate. cork, preferably comprising 80% by weight of polypropylene and 20% by weight of cork granulate, said hollow insulating profiles being fixed to said hollow aluminum profiled elements.

The present invention also relates to an aluminum window or door comprising the frame as defined above.

The present invention further relates to a process for producing an aluminum window or door. The production process comprises the steps of:

• produce a frame from hollow profiled aluminum elements;

• produce hollow insulating profiles from a composite comprising 75% to 85% by weight of polypropylene and 15% to 25% by weight of cork granulate; and • fix said hollow insulating profiles to said hollow aluminum profiles.

In a preferred embodiment of the process of the invention, the step of producing insulating hollow profiles is carried out from a composite comprising 80% by weight polypropylene and 20% by weight cork granulate.

Preferably, in the process of producing an aluminum window or door of the invention, said step of producing insulating hollow profiles is carried out by extrusion.

In a preferred embodiment, in said step of producing insulating hollow profiles of the process of the invention, the cork granulate has a density of between 50 - 60 Kg/m3 and a particle size of between 0.05 and 3 mm, preferably between 0.5 and 2 mm, more preferably between 1 and 2 mm.

In a very preferred embodiment, in said step of producing insulating hollow profiles, said cork granulate has a humidity of 0%.

More preferably, in said step of producing insulating hollow profiles, the polypropylene comprises a flow index comprised between 10g/10min and 14g/10min, a softening temperature comprised between 145°C and 160°C and a deflection temperature thermal temperature between 75 °C and 90 °C.

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a hollow insulating profile, for application in aluminum frames, said hollow insulating profile being formed from the extrusion of a composite of polypropylene and cork granulate. The invention further relates to an aluminum frame comprising said insulating hollow profile and to an aluminum window or door comprising said frame, as well as to their production process. The invention has application in the field of construction, in particular in the industrial production of aluminum windows or doors.

The hollow insulating profiles of the invention act as thermal and acoustic insulation elements when applied to aluminum structures that make up window or door frames.

In the context of the present description, the term comprising should be understood as including, among others. As such, the said term should not be construed as consisting solely of.

Note that any X value presented in the course of this description should be interpreted as an approximate value of the actual introduce deviations from the real value. Therefore, for example, the reference to 80% means a value of around 80%.

Unless otherwise noted, the value ranges presented in this description are intended to provide a simplified, technically accepted way to indicate each individual value within the respective range. By way of example, the expression 15% to 25% or between 15% and 25% means any value within this range, for example 15%; 16%; 17%; 18%; 19%; 20%; 21%; 22%; 23%; 24%; 25%; or others, for example including a decimal place.

Within the scope of the present invention, a frame is understood to be a set of profiled elements constructively arranged to form a window or door structure. Such profiled elements are hollow aluminum profiles, in which insulating elements are applied that provide thermal and acoustic insulation to the final structure comprising the window or door. In this way, it is possible to combine optimal strength/weight ratios with excellent levels of thermal and acoustic insulation in the structure of a window or door.

According to the present invention, extruded insulating hollow profile or, simply, insulating hollow profile, means a hollow element, produced by extrusion, which is intended to be applied and fixed to hollow profiled aluminum elements, constituting a frames. The function of the extruded insulating hollow profile of the invention is to provide thermal and acoustic insulation to windows or doors formed from the frames provided with said extruded insulating hollow profile.

Within the scope of the present invention, cork granules are understood as cork fragments whose particle size is between 0.05 and 3 mm, preferably between 0.5 and 2 mm, more preferably between 1 and 2 mm. .

Within the scope of the present invention, polypropylene or pp is understood to be _a polymer, more precisely a thermoplastic, derived from recyclable propene or propylene (plastic). Due to its characteristics, it is a type of plastic that can be molded using only heating, and is therefore classified as a thermoplastic.

In a very preferred embodiment of the invention, polypropylene has a flow index (MFI) of 12 g/10 min, softening temperature (vicat) of 153 °C and thermal deflection temperature of 82 °C.

According to the present invention, by polypropylene and cork granulate composite is meant a material comprising a mixture of polypropylene and cork granulate in proportions of 75% to 85% by weight of polypropylene and 15% to 25% by weight of cork granules, most preferably comprising 80% by weight polypropylene and 20% by weight cork granules.

Said composite of polypropylene (PP) and cork granules of the invention has particular application in the production of hollow insulating profiles for aluminum frames, providing such frames with high thermal and acoustic performance, without compromising their functional and mechanical performance and, therefore, consequence, of the structure of the windows or doors built from them.

The present invention developed from an attempt to use cork material to replace polyamides. This attempt was based on the fact that cork is a sustainable material with known thermal and acoustic insulating characteristics. On the other hand, the thermal insulation provided by cork also improves sustainability due to the lower energy consumption involved.

However, the search for a cork-based material to replace conventional polyamide proved to be extremely difficult.

The combination of thermosetting resins, such as polyurethane (PU) or PP with cork material, revealed numerous problems in the production of an insulating profile with the characteristics required by the industry producing windows or doors made from aluminum frames, particularly with regard to to obtain:

• insulating profiles with the required mechanical resistance;

• profiles with more or less complex shapes;

• profiles with required tolerances;

• profiles with the necessary dimensional stability.

With regard to the manufacturing processes of insulating profiles, the fact that a composite comprises cork poses the problem of limiting the operating temperatures of the production process to temperatures that do not degrade the cork.

Initially, an attempt was made to produce solid (or solid) section profiles from cork and PU or PP composites. The results were unsatisfactory due to material fluidity problems or the material clinging to the production machine or its finishing being poor or lacking dimensional stability.

On the other hand, it was concluded that such a massive insulating profile or, in other words, with a massive cross section, would be too heavy for the intended application of insulating aluminum frames.

Only a hollow cross-section profile or, in other words, a hollow profile, would be suitable for the said application. However, the problems occurring in the production of a solid profile remain and even tend to become more acute when producing a hollow profile, such as the one illustrated in Fig. 1. These issues become even more complicated when you want to obtain hollow profiles with more complex shapes by extrusion, such as the one illustrated in Fig. 2.

Surprisingly, it was found that the use of the PP composite and cork granules of the invention, as defined above and better described below, to form hollow insulating profiles, makes it possible to solve the problems of the prior art, and the production problems listed above that derive from the use of cork material in a composite for insulating profiles.

In particular, it was found that the insulating profiles of the invention significantly reduce C02 emissions in their production compared to conventional polyamide-based insulating profiles and simultaneously guarantee thermal and acoustic performance considered adequate by the industry.

In fact, Life Cycle studies were carried out which allowed us to conclude that by replacing conventional polyamide with the PP composite and cork granules of the invention, there is a reduction in environmental impact of between 11% and 39%. It was also possible to conclude that each 1% of insulating material changed from conventional polyamide to extruded cork in the applicant's window production represents 508,800 kg of CO2 not emitted into the atmosphere. In another relevant aspect, it was found that, due to the fact that the composite of the invention presents superior thermal conductivity from an insulation point of view in relation to conventional polyamide, it is possible to obtain energy savings in the phase of use of the final product, be it a window or a door.

Specifically, the present invention relates to a hollow insulating profile for aluminum frames, said insulating profile consisting of a composite comprising 75% to 85% by weight of polypropylene and 15% to 25% by weight of cork granulate.

It was experimentally verified that only the concrete and limited ranges mentioned above of PP and cork granules made it possible to obtain hollow insulating profiles by extrusion, with the profiles thus produced having the necessary characteristics of mechanical resistance, weight and thermal and acoustic insulation required by the industry.

The experiments originally carried out with ranges and materials other than those described above for the functional composite of the invention, resulted in defective insulation profiles or even made it impossible to obtain a finished form of insulating profile, resulting in elements incapable of meeting the technical requirements demanded by the industry.

Preferably, said composite comprises 75% by weight of polypropylene and 25% by weight of cork granulate; more preferably it comprises 85% by weight polypropylene and 15% by weight cork granulate; most preferably it comprises 80% by weight of polypropylene and 20% by weight of cork granulate.

In a preferred embodiment, the cork granulate of said composite has a density between

kg/ ^m3 . The use of cork granules within this density range made it possible to obtain adequate pressure during the extrusion process of the hollow insulating profiles, thus contributing to an adequate flow of material during said process.

In another embodiment, the cork granulate of said composite has a particle size of between 0.05 and 3 mm, preferably between 0.5 and 2 mm, more preferably between 1 and 2 mm. The choice of granulometry within these ranges made it possible to maximize the low density effect of cork, maintaining good processability of the composite material during extrusion. Furthermore, it was found that the aforementioned range of granulometry produces an impact on the surface finish of the hollow insulating profile, in particular the use of a granulometry within the range of 1 to 2 mm allowed to obtain the best surface finish (smoother) of the profiles. hollow insulators produced.

Preferably, the polypropylene of said composite comprises a melt flow index comprised between 10g/10min and 14g/10min, a softening temperature comprised between 145°C and 160°C and a thermal deflection temperature comprised between 75°C and 90°C. It was experimentally verified that these characteristics of PP are relevant for obtaining hollow insulating profiles by extrusion, as they contribute to preventing the disintegration or breakage of the material (composite) during the extrusion process, whilst also allowing the required dimensional tolerances of the profile to be maintained. insulating hollow obtained.

In a preferred embodiment, the polypropylene of said composite comprises a flow index of 12g/10min, a softening temperature of 153°C and a thermal deflection temperature of 82°C.

The present invention further relates to an aluminum frame comprising hollow aluminum profiled elements and hollow insulating profiles, as defined above, fixed to said hollow aluminum profiled elements.

Fixing the hollow insulating profiles of the invention to the hollow aluminum profile elements can be carried out essentially as follows:

• by gluing. Gluing has advantages in initial assembly and ease of separation at the end of the frame's useful life. However, it involves long curing times with corresponding associated production costs;

• by mechanical fixation. Ά mechanical fixing has good properties in terms of mechanical resistance. However, it increases production costs as it involves several fastening elements and considerable labor, in addition to enabling the creation of thermal bridges and less ease of dismantling at the end of the frame's useful life;

• by crimping. Crimping proved to be more reliable than previous fastening processes, as it presents lower production costs and ensures the technical requirements defined by the industry.

The present invention further relates to windows or doors comprising the frame as defined above. The aforementioned windows or doors constitute final products of interest to the consumer, which have demonstrated excellent thermal and acoustic insulation characteristics, in line with the demanding industry requirements, through the use of hollow insulating profiles made of PP composite and granulated cork defined above. For illustrative purposes only, Fig. 3 shows a section of the geometry of an aluminum window with glass, shims and a hollow insulating profile (with a thicker black line) of the invention.

The present invention further relates to a process for producing an aluminum window or door comprising the steps of:

• produce a frame from hollow profiled aluminum elements;

• produce hollow insulating profiles from a composite comprising 75% to 85% by weight of polypropylene and 15% to 25% by weight of cork granulate; and • fix said hollow insulating profiles to said hollow aluminum profiles.

In a preferred embodiment, the step of producing insulating hollow profiles is carried out from a composite comprising 80% by weight polypropylene and 20% by weight cork granulate.

In a very preferred embodiment, the step of producing hollow insulating profiles is carried out from an extrusion of said composite of PP and cork granulate.

Preferably, in the step of producing insulating hollow profiles, said cork granulate has a density of between 50 - 60 Kg/m ³ and a particle size of between 0.05 and 3 mm, preferably between 0.5 and 2 mm, more preferably between 1 and 2 mm. For its part, preferably, said polypropylene has a fluidity index comprised between 10g/10min and 14g/10min, a softening temperature comprised between 145°C and 160°C and a thermal deflection temperature comprised between 75°C. C and 90 °C; more preferably it has a flow rate of 12g/10min, a softening temperature of 153°C and a thermal deflection temperature of 82°C. As previously mentioned, these characteristics contribute to better material flow, particularly during extrusion and, consequently, to obtaining hollow insulating profiles with better structural integrity and improved dimensional tolerances, which contributes to improving the functional quality of the profile. insulating.

Most preferably, in said step of producing insulating hollow profiles, said cork granulate has a humidity of 0%. This feature makes it possible to obtain optimized insulating profiles, as it has been found that the presence of moisture in cork granules during the production process can create holes in the material, thus damaging the necessary mechanical and insulation characteristics of the hollow insulating profile produced. Without wishing to theorize, it is thought that this phenomenon occurs due to the vaporization of water possibly present in the cork granules due to the operating temperatures of the hollow insulating profile production process. This phenomenon is most common in the extrusion production process.

Therefore, in order to obtain optimized hollow insulating profiles, a preliminary drying step of the cork granulate is carried out before extrusion of the composite. It has been found that this drying can be carried out for a period of time comprised between 30 minutes and 4 hours at a temperature comprised between 50°C and 100°C, preferably for 1 hour to 3 hours at a temperature comprised between 60°C. and 80°C, more preferably for 2 hours at 70°C. The specialist will understand that these intervals are indicative, validated by the experimental activity carried out, and the relationship between drying time and temperature is normally inversely proportional, that is, the less time used, the higher the temperature to be used. For example, it has been found that when it is desired to spend 1 hour drying, a temperature of 80°C will be adequate to obtain a humidity of 0%. The same happens for the most preferred drying values for 2 hours at 70°C. Naturally, the person skilled in the art, to achieve the same objective of 0% humidity, may determine and use other relationships between drying time and temperature, as long as this does not cause degradation of the cork material.

EXAMPLES

Numerous extrusion production tests of hollow insulating profiles of the invention were carried out, varying the polypropylene/cork granulate compositions (mentioned below by PP/GC).

The table below summarizes, in a qualitative way, the results (unsatisfactory -; satisfactory +; good ++; excellent +++) obtained in the production by extrusion of simple hollow profiles (with rectangular cross-section - Profiles 1) represented in Fig. 1 , and complex hollow profiles (of complex cross-section 19

Profiles 2) represented in Fig. 2, given the different proportions of PP/GC used in their production.

20 rectangular section profiles (Pl) and 20 complex section profiles (P2) were produced for each PP/GC ratio presented in the table below.

For each PP/GC ratio presented, the granulometry of the cork granulate used varied within the range of 0.05 mm to 3 mm in the aforementioned sample of 20 Pl profiles and 20 P2 profiles.

The density of the cork granules was also varied in the aforementioned samples.

'''\%PP/%GC Profile is\. 70/30 75/25 80/20 85/15 90/10 Pl - ++ +++ +++ - P2 - + +++ + + -

It was possible to verify that the use of cork granules with a density of between 50 - 60 Kg/m ³ and a particle size between 1 and 2 mm provided improved results in terms of processability of the material during extrusion and surface finish of the profiles obtained.

An improved surface finish of the profiles obtained was also observed, as well as optimized mechanical and insulation characteristics in them, when a previous drying step was applied (until reaching a humidity of 0%) of the cork granulate used in the PP/GC composite subjected to the extrusion.

The experimental results allowed us to conclude that, regardless of other aspects or parameters, only the use of a composite comprising 75% to 85% by weight of polypropylene and 15% to 25% by weight of cork granulate, makes it possible to obtain extruded hollow profiles in a technically satisfactory and meeting the regulatory requirements stipulated in the aluminum frame industry.

It is to be noted that although the present invention has been described with reference to its preferred embodiments, many modifications and alternatives can be made by one skilled in the art without departing from the scope of the invention, which is defined by the claims.

Claims (15)

1. Hollow insulating profile for aluminum frames, characterized by comprising a composite comprising 75% to 85% by weight of polypropylene and 15% to 25% by weight of cork granulate. 2. Hollow insulating profile, according to claim 1, characterized in that it comprises a composite comprising 80% by weight of polypropylene and 20% by weight of cork granulate. 3. Hollow insulating profile, according to any of the previous claims, characterized in that said cork granulate has a density of between 50 - 60 kg/m ³ . 4. Hollow insulating profile, according to any one of the previous claims, characterized in that said cork granulate has a particle size comprised between 0.05 and 3 mm, preferably between 0.5 and 2 mm, more preferably between 1 and 2 mm. 5. Hollow insulating profile, according to any one of the preceding claims, characterized in that said polypropylene comprises a fluidity index comprised between 10g/10min and 14g/10min, a softening temperature comprised between 145°C and 160°C and a thermal deflection temperature between 75 °C and 90 °C. 6. Insulating hollow profile, according to the previous claim, characterized in that said polypropylene comprises a fluidity index of 12g/10min, a softening temperature of 153°C and a thermal deflection temperature of 82°C. 7. Aluminum frames characterized by comprising hollow aluminum profiled elements and hollow insulating profiles as claimed in any one of claims 1 to 6 fixed to said hollow aluminum profiled elements. 8. Aluminum window characterized by comprising an aluminum frame as claimed in claim 7. 9. Aluminum door characterized by comprising an aluminum frame as claimed in claim 7. 10. Production process for an aluminum window or door characterized by comprising the steps of: produce a frame from profiled, hollow, aluminum elements; produce hollow insulating profiles from a composite comprising 75% to 85% by weight of polypropylene and 15% to 25% by weight of cork granulate; and fixing said hollow insulating profiles to said hollow aluminum profiles. 11. Process for producing an aluminum window or door according to claim 10, characterized in that said step of producing hollow insulating profiles is carried out from a composite comprising 80% by weight of polypropylene and 20% by weight of granulate of cork. 12. Process for producing an aluminum window or door according to claim 10 or 11, characterized in that in said step of producing insulating hollow profiles, said cork granulate has a density of between 50 - 60 Kg/m ³ and a particle size comprised between 0.05 and 3 mm, preferably between 0.5 and 2 mm, more preferably between 1 and 2 mm. 13. Process for producing an aluminum window or door according to any one of claims 10 to 12, characterized in that in said step of producing insulating hollow profiles, said cork granulate has a humidity of 0%. 14. Process for producing an aluminum window or door according to any one of claims 10 to 13, characterized in that in said step of producing insulating hollow profiles, said polypropylene comprises a fluidity index comprised between 10g/10min and 14g/ 10min, a softening temperature between 145°C and 160°C and a thermal deflection temperature between 75°C and 90°C. 15. Process for producing an aluminum window or door according to any one of claims 10 to 14, characterized in that said step of producing insulating hollow profiles is carried out by extrusion.