Title of Invention

"MULTILAYER PRODUCT MADE OF PLASTIC MATERIALS"

Abstract Multi-layer product comprising three layers A,B and C, wherein layer A comprises a transparent thermoplastic plastics material, and wherein layer B comprises a transparent thermoplastic plastics material and a pigment consisting of a transparent support material and a titanium dioxide layer located above the support material and having a thickness of from 150 to 200 nm, and wherein layer C comprises a transparent thermoplastic plastics material, and wherein further layers may be applied over the titanium dioxide layer, and wherein the transparent thermoplastic plastics material contained in layers A, B and C is selected from the group consisting of polycarbonate and a copolyester derived from dicarboxylic acids and diols, wherein the dicarboxylic acids are selected from the group consisting of terephthalic acid, isophthalic acid and cyclohexane-1, 4-dicarboxylic acid and wherein the diols are selected from the group consisting of ethylene glycol, cyclohexanedimethanol and diethylene glycol, and wherein repeating units derived from deithylene glycol account for less than 5 mol.% of all repeating units derived from diols.
Full Text The present invention relates to a multilayer product made of a plastics material which exhibits high IR reflection and a high gloss.
This invention relates to a multilayer product made of a plastics material which exhibits high IR reflection and a high gloss.
Multilayer products are known which comprise layers which contain transparent thermoplastic plastics materials.
Polycarbonate sheets are known in particular. They are produced for a multiplicity of purposes of use. They are produced, for example, by the extrusion of compositions which contain polycarbonate (moulding compositions) and optionally by coextrusion with moulding compositions which have an increased content of UV absorbers.
Polycarbonate sheets are known from EP-A 0 110 221.
For the long-term protection of polycarbonate sheets from yellowing due to UV light, EP-A 0 320 632 teaches that the sheets can be provided with a coextrusion layer which contains high concentrations of difficultly volatile UV absorbers.
EP-B 0 678 376 and EP-B 0 595 413 teach that for sheets made of polyesters, particularly sheets comprising copolyesters formed from aromatic dicarboxylic acids and mixtures of two aliphatic diols, e.g. PETG, protection from weathering is achieved by coextrusion with outer layers which contain high concentrations of UV absorbers, e.g. those based on benzotriazoles.
A panel made of polymethyl methacrylate with a content of hght-reflecting particles aligned parallel to the surface is known from German Patent Specification DE-C 25 44 245. Its layer thickness is designed so that visible light is substantially transmitted and infrared radiation is substantially reflected.
This known body contains hght-reflecting particles, which are contained in the base material which is made of polymethyl methacrylate. They are incorporated in the










We claim :-
1. Multi-layer product comprising three layers A, B and C, wherein layer A comprises a transparent thermoplastic plastics material, and wherein layer B comprises a transparent thermoplastic plastics material and a pigment consisting of a transparent support material and a titanium dioxide layer located above the support material and having a thickness of from 150 to 200 nm, and wherein layer C comprises a transparent thermoplastic plastics material, and wherein further layers may be applied over the titanium dioxide layer, and wherein the transparent thermoplastic plastics material contained in layers A, B and C is selected from the group consisting of polycarbonate and a copolyester derived from dicarboxylic acids and diols, wherein the dicarboxylic acids are selected from the group consisting of terephthalic acid, isophthalic acid and cyclohexane-1, 4-dicarboxylic acid and wherein the diols are selected from the group consisting of ethylene glycol, cyclohexanedimethanol and diethylene glycol, and wherein repeating units derived from deithylene glycol account for less than 5 mol.% of all repeating units derived from diols.
2. Multi-layer product as claimed in claim 1, wherein layer B has a thickness of from 15 to 250 urn.
3. Multi-layer product as claimed in either claim 1 or claim 2, wherein layer B is located between layers A and C.
4. Multi-layer product as claimed in any one of claims 1 to 3 selected from the group consisting of sheets, solid sheets, corrugated sheets and multi-wall sheets.
5. Process for the production of the multi-layer product as claimed in any one of claims 1 to 4 by coextrusion.
6. Use of the multi-layer product as claimed in any one of claims 1 to 4 in the production of decorative sheets for wall claddings, partition walls', ceiling claddings, false ceilings, glazing for greenhouses, glazing for conservatories, glazing for bus stops, roofing, glazing which attenuates incident light, or for the replacement of paints and for thermal insulation.
7. Product comprising a multi-layer product as claimed in any one of claims 1 to 4.
8. Product as claimed in claim 7, selected from the group consisting of wall cladding, partition wall, ceiling cladding, false ceiling, glazing for greenhouses, glazing for conservatories, glazing for bus stops, roofing, glazing which attenuates incident light, replacement product for paints and product for thermal insulation.

Documents:

1442-DELNP-2004-Abstract-(18-05-2010).pdf

1442-DELNP-2004-Claims-(18-05-2010).pdf

1442-DELNP-2004-Correspondence-Others-(18-05-2010).pdf

1442-DELNP-2004-Description (Complete)-(18-05-2010).pdf

1442-DELNP-2004-Form-1-(18-05-2010).pdf

1442-DELNP-2004-Form-2-(18-05-2010).pdf

1442-DELNP-2004-Form-3-(18-05-2010).pdf

1442-DELNP-2004-GPA-(18-05-2010).pdf

1442-DELNP-2004-Petition 137-(18-05-2010).pdf

1442-DELNP-2004-Petition 138-(18-05-2010).pdf


Patent Number 244290
Indian Patent Application Number 1442/DELNP/2004
PG Journal Number 49/2010
Publication Date 03-Dec-2010
Grant Date 30-Nov-2010
Date of Filing 27-May-2004
Name of Patentee BAYER MATERIALSCIENCE AG
Applicant Address D-51368 LEVERKUSEN, GERMANY
Inventors:
# Inventor's Name Inventor's Address
1 RUDIGER GORNY 122 SOUTH JAMESTOWN RD., MOON TWP., PA 15108, USA
2 SIEGFRIED ANDERS HUMPERDINCKSTR. 3, D-51147 KOLN, GERMANY
3 WOLFGANG NISING MAINSTR. 4, D-53757 ST. AUGUSTIN, GERMANY
PCT International Classification Number B32B 27/20
PCT International Application Number PCT/EP02/13403
PCT International Filing date 2002-11-27
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 101 60 569.2 2001-12-10 Germany