FR2630076A3 - TRANSPARENT ROOF FOR MOTOR VEHICLES - Google Patents

Abstract

Transparent roof for motor vehicles, comprising a sheet of glass 1, preferably tempered, one or more flexible layers intended to reduce energy and light transmission. This roof has a layer of transparent plastic material 2, intimately bonded to the substrate and applied to the surface facing the interior of the passenger compartment of the motor vehicle in order to protect the passengers from accidental glass breakage and water infiltration following the operation. a break in the glass.

Description

TRANSPARENT ROOF FOR MOTOR VEHICLES

  The present invention relates to a glass sheet for motor vehicles, particularly

  suitable for use as a transparent vehicle roof

  vehicle itself, glass in the form of a sheet of any thickness, preferably toughened for safety reasons, of one or more flexible layers in order to reduce light and energy transmission, and of a flexible layer of transparent plastic.

  Transparent roofs for motor vehicles

  are commonly known in the state of the art.

  In general, their dimensions are such that

  the only concern a part of the total surface of the metal roof of the vehicle, and preferably the surface situated vertically of the front seats; however, they can of course also relate to surfaces

larger from the roof.

  Usually these roofs are formed from a sheet of glass, tempered for safety reasons,

  a partially opaque layer obtained by serigra-

  phie, in order to reduce energy transmission and

  miner or a flexible reflective layer, deposited by pyrolysis or by cathode sputtering, also having the aim of subsequently reducing the

  energy and light transmission.

  A product thus described, however, presents the

  agrees that despite having a notable breaking strength, thanks to the tempering treatment that the glass has undergone, it does not protect passengers in the seats located below it, from

  glass splashes in case of accidental breakage

  ci, no more than it prevents the penetration of water inside the passenger compartment, deteriorating the coatings

internal parts of the vehicle.

  The object of the present invention is therefore

  provide a transparent roof for vehicles

  tomobiles which offers better convenience of use

  and increased safety in use, eliminating the

conveniences described above.

  The transparent roof according to the present invention comprises a glass sheet, preferably toughened, one or more flexible layers applied to the glass to reduce the energy and light transmission,

  and a layer of plastic, preferably applied

  quée on the surface facing the passenger compartment of the motor vehicle, obtained by polymerizing directly on the

  substrate a composition based on polyurethane chains

  that arranged in interpenetration but not chemically linked

  only between them, and by applying this composition according to a spraying and centrifugation process; this type of composition and process is already known by

  Italian Patent No. 1,160,482 and by the Italian application

  lienne n '19459 A 86, both from the same author.

  The thickness of the transparent plastic layer

  rent is preferably between 100 microns and 1 mm.

  The object of the present invention is therefore

  consisting of a transparent roof intended for a vehicle

  automobile vehicle, comprising a sheet of glass on which one or more flexible layers are deposited

  having the function of reducing the energy transmission

  that and bright, characterized by the fact of presenting

  on the surface facing the passenger compartment of the vehicle

  tomobile, a transparent plastic layer intimately linked to the substrate, with a thickness of between 100 microns and 1 mm, this plastic layer being obtained by spraying and centrifugation

  a composition Based on polyurethane chains available

  posed in interpenetration but not chemically linked, and then performing direct polymerization on

the substrate of the composition.

  The invention will be better understood using the attached figure provided by way of example only, and in which is shown a transparent roof for motor vehicles, produced from a sheet of glass 1, of a partially opaque screen-printed layer

  3 and a transparent plastic layer 2.

  Since it is necessary to provide

  gers \ all desirable comfort in the passenger compartment, it is preferable that the light transmission values

  energy consumption of the transparent roof are reduced above

  under 25% of the total incident energy.

  The partially opaque screen-printed layer 3 consequently has transparent squares arranged in the form of a chessboard with sides of length less than 0.6 mm in order to allow transmission.

  energy and light less than 10%.

  A subsequent reduction in energy and light transmission can also be obtained by

  using plastic layers containing pig-

appropriate colored elements.

  Another transparent roof model for vehicles

  automobiles, falling within the scope of the present invention, is produced from:

  a glass sheet of the thickness included in

  be 4 and 2 mm; a flexible reflective layer obtained by sputtering of metal oxides;

  a layer of clear plastic.

  It was found that the light transmission was reduced to a value of 10% while the

  energy transmission has been reduced to a value

their by 7%.

  Of course, the effects of the present invention

  tion also extend to models which make it possible to obtain different utilities by implementing the

same concept of invention.

Claims (7)

  1. Transparent roof for motor vehicles, comprising a glass sheet, preferably toughened,   one or more flexible layers intended to   reduce energy and light transmission, characteristic   laughed at in that it has a layer of plastic material   transparent, intimately linked to the substrate and applied   the area facing the interior of the dwelling   motor vehicle tackle to protect passers   of accidental glass breakage and infiltration   of water following a glass break.   2. Transparent roof according to claim 1,   characterized in that the thickness of the plas-   transparent tick is between 100 microns and 1 mm.   3. Roof according to claim 1 or 2, charac-   terized in that the transparent plastic layer is obtained by polymerizing directly on the substrate a composition comprising polyurethane chains   arranged in interpenetration but not linked chemically-   is lying. 4. Transparent roof according to any one of   previous claims, characterized in that the   transparent plastic layer is obtained by applying a polyurethane composition by means of a   spraying and centrifugation.   5. Transparent roof according to any one of   previous claims, characterized in that the   partially opaque screen-printed layer has   transparent squares with lower sides & 0.6 mm available   in the form of a chessboard on the substrate.   6. Transparent roof according to any one of   previous claims, characterized in that the   transparent plastic layer is colored to   using appropriate pigments to reduce trans- energy and light mission.   7. Transparent roof according to any one of   previous claims, characterized in that it pre-   has a light transmission and an energy transmission of less than 10 X.