US4464439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Co-extruded laminate consisting of at least one sheet of polypropylene and at least one sheet of polymeric material based on high-impact polystyrene
Assignee: MONTEFINA SA ZONING INDUSTRIEL- B-6520 FELUY-BELGIUM A CORP OF BELGIUM
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Filing: 1982-03-10
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Granted: 1984-08-07
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Expires: 2002-03-10
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
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:30
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
133 words
A 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 45% to 55% by weight of high-impact polystyrene (HIPS), from 40% to 45% by weight of crystalline polypropylene and from 5% to 15% by weight of styrene/dienic monomer tri-block copolymer, in which the dienic monomer is butadiene or isoprene, with a structure of at least 3 sequences and represented by the formula S--(D--S) n wherein n is an integer, 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
133 words
A 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 45% to 55% by weight of high-impact polystyrene (HIPS), from 40% to 45% by weight of crystalline polypropylene and from 5% to 15% by weight of styrene/dienic monomer tri-block copolymer, in which the dienic monomer is butadiene or isoprene, with a structure of at least 3 sequences and represented by the formula S--(D--S) n wherein n is an integer, 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
44 words
A 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 styrene/dienic monomer tri-block copolymer as defined in claim 1.
Claim 4
Dependent Claim
28 words
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.
Claim 5
Dependent Claim
18 words
A thermoplastic laminate according to claim 1, in which, in the formula S--(D--S) n , n is 1.
References Cited (Backward Citations)
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US4197377A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-07 | 1988-02-06 | 1988-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-07 | 1992-02-06 | 1992-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-07 | 1996-02-06 | 1996-08-07 | $7700.00 | Window Closed / Lapsed |