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EP0165791A2
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EP
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Composite films and their preparation
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1985-06-14
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Granted: —
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Expires: 2005-06-14
Abstract
Abstract A composite film composition comprises a rubber (e.g. PIB) containing core component having from 50 to 85 wt% rubber and 15 to 40 wt% of a polyolefin (e.g. PP or RCPP) and at least one, preferably two, polyolefin skin layer(s) co- extruded onto the core.
Inventors
- 👤 Donald Ross Hazelton
- 👤 Cindy Beth Shulman
- 👤 Edward Nathan Kresge
- 👤 Jeffrey Alan Middlesworth
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 07:41
CPC Classifications
B; B32; B32B; B32B25/00; B32B25/04; B32B25/08; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/25; B29C48/88; B29C48/911; B29C48/9135; B29C48/914; B29C48/915; B29C48/917; B29C59/00; B29C59/02; B29C59/04; B29C59/046; B32B15/00; B32B15/20; B32B25/16; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/304; B32B27/306; B32B27/32; B32B7/00; B32B7/04; B32B7/12; C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/10; C08L23/12; C08L23/16; C08L23/18; C08L23/20; C08L23/22; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/0608; B29K2023/0625; B29K2023/08; B29K2023/083; B29K2023/086; B29K2023/10; B29K2023/12; B29K2023/16; B29K2105/00; B29K2105/0088; B29K2995/00; B29K2995/0018; B29K2995/0022; B29K2995/0026; B32B2439/00; B32B2439/80; C08L2205/00; C08L2205/03; C08L2207/00; C08L2207/53; C08L23/08; C08L23/0807; C08L23/0815
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
39 words
A composite film composition comprising a rubber containing core component and at least one skin layer wherein the skin layer comprises a polyolefin resin and the rubber containing core component comprises from 50 wt% to 85 wt% of rubber.
Claim 2
Dependent Claim
39 words
A composite film composition comprising a rubber containing core component and at least one skin layer wherein the skin layer comprises a polyolefin resin and the rubber containing core component comprises from 50 wt% to 85 wt% of rubber.
Claim 3
Dependent Claim
36 words
The composite film according to claim 1 wherein the rubber is PIB, butyl rubber, EPM, EPDM, halogenated butyl rubber or polychloroprene, and wherein the polyolefin skin layer is polypropylene, RCPP, HDPE, LLDPE, polybutene-1 or mixtures thereof.
Claim 4
Dependent Claim
31 words
The composite film according to claim 1 or 2 wherein the rubber core component comprises from 50 to 85 wt% of rubber and from 15 to 50 wt% of a polyolefin.
Claim 5
Dependent Claim
33 words
4 . The composite film - according to claim 3 wherein the rubber core component comprises from 60 to 85 wt% of rubber and from 15 to 4 0 wt% of a polyolefin.
Claim 6
Dependent Claim
26 words
The composite film according to claim 1,2,3 or 4 wherein the film comprises a sandwich construction of two polyolefin skins having an inner rubber-containing core component.
Claim 7
Dependent Claim
25 words
The composite film according to any one of claims 1- wherein the rubber-containing core component comprises a blend of PIB with PP or RCPP polyolefin.
Claim 8
Dependent Claim
35 words
The composite film according to any one of claims 1- wherein at least one skin layer has a 45 0 gloss of at least 50, preferably at least 60 and more preferably at least 75.
Claim 9
Dependent Claim
16 words
The composite film according to claim 1 wherein the polyolefin skin layer comprises PVDC or EVOH.
Claim 10
Dependent Claim
22 words
The composite film according to any one of claims 1-8 having at least one overlayer bonded to at least one skin layer.
Claim 11
Dependent Claim
21 words
The composite film according to. claim 9 wherein the overlayer is bonded to the skin layer using an adhesive tie layer.
Claim 12
Dependent Claim
20 words
The composite film according to claim 9 or 10 wherein the overlayer comprises a polyolefin film comprising PVDC or EVOH.
Claim 13
Dependent Claim
20 words
The composite film according to claim 9 or 10 wherein the 'overlayer comprises a metal foil preferably aluminium or copper.
Claim 14
Dependent Claim
32 words
The composite film composition according to claim 5 or any one of claims 6-12 when dependent on claim 5 wherein one polyolefin skin comprises a different polyolefin than the other polyolefin skin.
Claim 15
Dependent Claim
23 words
The composite film composition according to claim 13 wherein one polyolefin skin comprises PP or RCPP and the other polyolefin skin comprises PVDC.
Claim 16
Dependent Claim
15 words
The composite according to claim 14 wherein the rubber comprises at least one halogenated rubber.
Claim 17
Dependent Claim
21 words
The composite according to claim 14 or 15 wherein the PVDC is tied to the rubber composition by a tie layer.
Claim 18
Dependent Claim
14 words
The composite according to claim 16 wherein the tie layer is a polyurethane adhesive.
Claim 19
Dependent Claim
46 words
The composite according to claim 5 or any one of claims 6 - 13 when dependent on claim 5 wherein the polyolefin skins comprise a polyolefin other than PVDC and at least one of said polyolefin skins is overlayered by a film of PVDC adhered thereto.
Claim 20
Dependent Claim
129 words
A process for preparing a composite film which comprises: a) co-extruding a molten composition comprising a first co-extruded layer and at least one second co-extruded layer wherein the first co- extruded layer is a rubber containing composition comprising from 50 to 85 wt % rubber and the second co-extruded layer comprises a polyolefin thereby forming a web of a composite film of said first and second co- extruded layers; b) passing the web at a temperature above its softening point through the nip of two counterrotating rollers, one of said rolls being a first highly polished metal chill roll and a second roller being a resilient roller; c) cooling the blend to produce a composite film having at least one surface with a 45° gloss of at least 40.
Claim 21
Dependent Claim
129 words
A process for preparing a composite film which comprises: a) co-extruding a molten composition comprising a first co-extruded layer and at least one second co-extruded layer wherein the first co- extruded layer is a rubber containing composition comprising from 50 to 85 wt % rubber and the second co-extruded layer comprises a polyolefin thereby forming a web of a composite film of said first and second co- extruded layers; b) passing the web at a temperature above its softening point through the nip of two counterrotating rollers, one of said rolls being a first highly polished metal chill roll and a second roller being a resilient roller; c) cooling the blend to produce a composite film having at least one surface with a 45° gloss of at least 40.
Claim 22
Dependent Claim
15 words
The process according to claim 19 wherein the surface 45° gloss is at least 50.
Claim 23
Dependent Claim
22 words
The process according to claim 19 or 20 wherein the second roller is a resilient roller having a highly glossy rubber surface.
Claim 24
Dependent Claim
30 words
The process according to claim 19, 20 or 21 wherein the composite film comprises two second co-extruded layers having sandwiched between the two second co-extruded layers the first co-extruded layer.
Claim 25
Dependent Claim
15 words
The process according to claim 22 wherein each second layer comprises the same polyolefin resin.
Claim 26
Dependent Claim
20 words
The process according to claim 22 wherein one second co-extruded layer comprises a different polyolefin than the other second layer.
Claim 27
Dependent Claim
20 words
The process according to claim 24 wherein one second co-extruded layer is PP or RCPP and the other is PVDC.
Claim 28
Dependent Claim
18 words
The process according to claim 25 wherein a tie layer is used between PVDC and the rubber composition.
Claim 29
Dependent Claim
14 words
The process according to claim 26 wherein the tie layer is a polyurethane adhesive.
Claim 30
Dependent Claim
32 words
The process according to any one of claims 19 - 27 wherein the first co-extruded layer comprises from 65 to 85 wt % rubber and from 15 to 35 wt % polyolefin.
Claim 31
Dependent Claim
32 words
The process according to any one of claims 19 - 28 wherein the rubber is PIB, butyl rubber, halogenated butyl rubber, EPM, EPDM or polychloroprene, and the polyolefin is PP or RCPP.
Claim 32
Dependent Claim
43 words
A container for liquids and solids comprising a pouch formed from a composite film composition prepared according to the process of any one of claims 19 - 29, or from a composite film composition according to any one of claims 1 - 18.
Claim 33
Dependent Claim
17 words
A container according to claim 30 adapted for or when containing blood or a parenteral drug solution.
References Cited (Backward Citations)
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