Patent US4076570A successfully refreshed from Google Patents.
US4076570A
Expired / Lapsed
US
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Process for the production of a multiple layer laminate
Assignee: Cosden Technology Inc
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Filing: 1974-11-20
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Granted: 1978-02-28
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Expires: 1994-11-20
Abstract
Abstract Disclosed is a process for producing a laminate having at least three layers comprising a base layer of polystyrene, an intermediate layer of an ABS polymer and a third barrier layer of a vinyl chloride or vinylidene chloride polymer comprising the steps of co-extruding through a single die orifice a heat plastified composite structure comprising a base layer of polystyrene and a surface layer of an ABS polymer and thereafter laminating a preformed layer of a barrier material polymer to the ABS surface layer of the co-extruded composite.
Inventors
- 👤 Ronald D. Medley
- 👤 James R. Chapman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:59
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/305; B29C48/307; B32B27/30; B32B27/302; B32B27/304; B32B37/00; B32B37/06; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2309/00; B32B2309/02; B32B2309/08; B32B2309/10; B32B2309/105; B32B2439/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
156 words
A process for the manufacture of a laminated structure comprising a base layer of styrene polymer, an intermediate layer of an ABS polymer and a surface layer of a barrier material comprising a vinylidene chloride copolymer having copolymerized therein vinylidene chloride monomer and up to 30% of a monomeric material copolymerizable therewith comprising the steps of extruding from a single die orifice a a heat plastified laminate structure comprising a base layer of styrene polymer and at least one surface layer of an ABS polymer, capable of adhering to said styrene polymer with a bond of at least about 3 lbs/inch, thence laminating a pre-formed layer of said barrier material to the ABS surface layer(s) of said co-extruded laminate and controlling the temperature of said co-extruded laminate and said pre-formed layer of barrier material so that upon lamination said barrier material is heated to a temperature from slightly below its melting temperature to its degradation temperature.
Claim 2
Dependent Claim
156 words
A process for the manufacture of a laminated structure comprising a base layer of styrene polymer, an intermediate layer of an ABS polymer and a surface layer of a barrier material comprising a vinylidene chloride copolymer having copolymerized therein vinylidene chloride monomer and up to 30% of a monomeric material copolymerizable therewith comprising the steps of extruding from a single die orifice a a heat plastified laminate structure comprising a base layer of styrene polymer and at least one surface layer of an ABS polymer, capable of adhering to said styrene polymer with a bond of at least about 3 lbs/inch, thence laminating a pre-formed layer of said barrier material to the ABS surface layer(s) of said co-extruded laminate and controlling the temperature of said co-extruded laminate and said pre-formed layer of barrier material so that upon lamination said barrier material is heated to a temperature from slightly below its melting temperature to its degradation temperature.
Claim 3
Dependent Claim
22 words
The process as defined by claim 1, wherein said pre-formed layer of barrier material is supplied from a roll of sheet material.
Claim 4
Dependent Claim
23 words
The process as defined by claim 1, wherein said pre-formed layer of barrier material is supplied directly from a second extrusion die orifice.
Claim 5
Dependent Claim
40 words
The process as defined by claim 1, wherein said intermediate layer of ABS polymer has a thickness of from about 1 to 7 mils and said vinylidene chloride co-polymer layer has a thickness of from about 1 to 5 mils.
Claim 6
Dependent Claim
12 words
The process as defined by claim 1, wherein said polystyrene is homopolystyrene.
Claim 7
Dependent Claim
13 words
The process as defined by claim 1, wherein said polystyrene is impact polystyrene.
Claim 8
Dependent Claim
23 words
The process as defined by claim 1, wherein said laminated structure consists of said base layer, said intermediate layer and said surface layer.
Claim 9
Dependent Claim
41 words
The process as defined by claim 1, wherein said temperature control step comprises selecting a distance between said die orifice and the point of laminating said pre-formed layer of barrier material sufficient to provide the said temperature of the barrier material.
Claim 10
Dependent Claim
31 words
The process as defined by claim 1, wherein said temperature control step comprises cooling said co-extruded laminate after it leaves said die orifice but before said barrier material is laminated thereto.
Claim 11
Dependent Claim
53 words
The process as defined by claim 1, wherein said extrusion step comprises extrusion of a laminate structure comprising a base layer having both major surfaces covered by a surface layer of said ABS polymer and wherein said lamination step comprises laminating a pre-formed layer of said barrier material to both ABS surface layers.
Claim 12
Dependent Claim
23 words
The process as defined by claim 1, wherein said layer of barrier material has a thickness of from about 5 to 10 mils.
Claim 13
Dependent Claim
21 words
The process as defined by claim 1, wherein said base layer has a thickness of from about 10 to 40 mils.
Claim 14
Dependent Claim
24 words
The process as defined by claim 1, wherein said barrier material is a copolymer of vinylidene chloride with a minor portion of vinyl chloride.
Claim 15
Dependent Claim
21 words
The process as defined by claim 13, wherein said temperature of the barrier material is between about 380° and 430° F.
Claim 16
Dependent Claim
17 words
The process as defined by claim 14, wherein said temperature is between about 405° and 415° F.
Claim 17
Dependent Claim
19 words
The process as defined by claim 1, further comprising the step of applying pressure to the final laminated structure.
Claim 18
Dependent Claim
24 words
The process as defined by claim 16, wherein said pressure applying step comprises passing said laminated structure between at least one pair of rollers.
References Cited (Backward Citations)
US3206354A
Cited
US3396062A
Cited
US3589976A
Cited
US3620900A
Cited
US3654069A
Cited
US3645838A
Cited
US3748218A
Cited
GB1364176A
Cited
US3755050A
Cited
US3798103A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |