EP0060526A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Coextruded laminate comprising a polypropylene sheet, and a sheet of a mixture containing a high impact polystyrene
Assignee: Montefina SA
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Filing: 1982-03-11
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Granted: —
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Expires: 2002-03-11
Abstract
Abstract Thermoplastic laminate suited for thermo-forming, consisting of at least one sheet of crystalline polypropylene and of at least one sheet of polymeric material consisting of a mixture of high-impact polystyrene (from 1% to 75% by weight), crystalline polypropylene (from 20% to 85% by weight) and of styrene/dienic monomer block copolymer with three or more sequences (from 5% to 15% by weight).
Inventors
- 👤 Jean Castelein
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 14:40
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/302; B32B27/32; B32B2307/00; B32B2307/70; B32B2307/704; B32B2323/00; B32B2323/10; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
138 words
1). Thermoplastic laminate, suitable for thermo-forming, of a composite structure consisting of at least one sheet of crystalline polypropylene and of at least one sheet of polymeric material consisting of a mixture containing 1% to 75% by weight of high-impact polystyrene (HIPS), from 20 to 85% by weight of crystalline polypropylene and from 5% to 15% by weight of styrene/dienic monomer block copolymer, in which the dienic monomer is butadiene or isoprene, with a structure of 3 or more sequences and represented by formula S-(D-S) n wherein n is an integer, preferably 1, S = styrene, D = butadiene or isoprene, having a content in styrene lower than 50% by weight, said laminate being obtained through the co-extrusion of the different polymeric materials constituting the single individual sheets and by the successive calandering together of the co-extruded sheets.
Claim 2
Dependent Claim
138 words
1). Thermoplastic laminate, suitable for thermo-forming, of a composite structure consisting of at least one sheet of crystalline polypropylene and of at least one sheet of polymeric material consisting of a mixture containing 1% to 75% by weight of high-impact polystyrene (HIPS), from 20 to 85% by weight of crystalline polypropylene and from 5% to 15% by weight of styrene/dienic monomer block copolymer, in which the dienic monomer is butadiene or isoprene, with a structure of 3 or more sequences and represented by formula S-(D-S) n wherein n is an integer, preferably 1, S = styrene, D = butadiene or isoprene, having a content in styrene lower than 50% by weight, said laminate being obtained through the co-extrusion of the different polymeric materials constituting the single individual sheets and by the successive calandering together of the co-extruded sheets.
Claim 3
Dependent Claim
42 words
2) Thermoplastic laminate according to claim 1, characterized in that the sheet of crystalline polypropylenic material consists of a crystalline polypropylene mixed together with a quantity of not more than 15% by weight of the block copolymer styrene/diene as defined in claim
Claim 4
Dependent Claim
43 words
3) Thermoplastic laminate according to claim 1, characte- rizedin that the polymeric material based on high-impact polystyrene contains from 45% to 55% by weight of high-impact polystyrene, from 40% to 50% by weight of polypropylene and 10% by weight of a block copolymer.
Claim 5
Dependent Claim
29 words
4) Containers for foodstuffs, obtained by thermo-forming the laminate of claim 1, and in which containers the inner side in contact with the product consists of the polypropylenic layer.
References Cited (Backward Citations)
No citation records indexed.
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