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US4666772A
Expired / Lapsed
US
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Opaque, heat sealable multilayer polyolefin films
Assignee: Dow Produktions und Vertriebs GmbH and Co OHG
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Filing: 1986-05-09
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Granted: 1987-05-19
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Expires: 2006-05-09
Abstract
Abstract Heatsealable opaque multilayer films, particularly wrapping films, having a high sealing strength, at low sealing temperature, favorable optical properties and machine compatibility based on a film of a propylene polymer and a linear statistical ethylene copolymer of low density as the heat sealing layer.
Inventors
- 👤 Ingo Schinkel
- 👤 Jurgen Bohner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:16
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/18; B32B27/20; B32B27/06; B32B27/08; B32B27/32; B29; B29K; B29K2995/00; B29K2995/0037; B29K2995/0081; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/40; B32B2307/41; B32B2307/50; B32B2307/514; B32B2307/518; B32B2323/00; B32B2323/04; B32B2323/046; B32B2323/10; B32B2553/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/25; Y10T428/254; Y10T428/258; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2822; Y10T428/2826; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31667; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
137 words
An opaque, heat-sealable multilayer film which comprises a biaxially-oriented base layer comprising a polymer of propylene and optionally up to 10%, by weight, of at least one α-olefin containing up to 8 carbon atoms from 3 to 15%, by weight, of at least one additive incompatible and fine dispersed therewith, and at least one at least monoaxially-oriented heat-sealable layer comprising: (a) from 66.5 to 94.5%, by weight, of a linear, statistical ethylene copolymer (LLDPE) having a low density; (b) from 5 to 30%, by weight, of a low molecular weight resin compatible with (a), except a low molecular weight polyolefin resin of a α-olefin with at most 3 C atoms; (c) from 0.3 to 2%, by weight, of a mixture of a polyethylene wax and an oxazoline wax; (d) from 0.2 to 1.5%, by weight, of polydiorganosiloxane.
Claim 2
Dependent Claim
137 words
An opaque, heat-sealable multilayer film which comprises a biaxially-oriented base layer comprising a polymer of propylene and optionally up to 10%, by weight, of at least one α-olefin containing up to 8 carbon atoms from 3 to 15%, by weight, of at least one additive incompatible and fine dispersed therewith, and at least one at least monoaxially-oriented heat-sealable layer comprising: (a) from 66.5 to 94.5%, by weight, of a linear, statistical ethylene copolymer (LLDPE) having a low density; (b) from 5 to 30%, by weight, of a low molecular weight resin compatible with (a), except a low molecular weight polyolefin resin of a α-olefin with at most 3 C atoms; (c) from 0.3 to 2%, by weight, of a mixture of a polyethylene wax and an oxazoline wax; (d) from 0.2 to 1.5%, by weight, of polydiorganosiloxane.
Claim 3
Dependent Claim
46 words
A film as claimed in claim 1 wherein the heat sealable layer comprises: from 78 to 89.1%, by weight, of (a); from 10 to 20%, by weight, of (b); from 0.5 to 1%, by weight, of (c); and from 0.4 to 1%, by weight, of (d).
Claim 4
Dependent Claim
31 words
A film as claimed in claim 1 wherein the base layer comprises from 8 to 12%, by weight, of incompatible additives having an average particle size from 0.2 to 20 μm.
Claim 5
Dependent Claim
21 words
A film as claimed in claim 1 wherein at least one of conventional additive or auxiliarie is present as component (e).
Claim 6
Dependent Claim
36 words
A film as claimed in claim 1, wherein component (a) is a copolymer of ethylene and up to 12 mol%, of C 3 -C 10 α-olefins having a density from 0.900 to 0.940 g/cm 3 .
Claim 7
Dependent Claim
32 words
A film as claimed in claim 5, wherein the C 3 -C 10 α-olefin of component (a) is selected from the group of propylene, 1-butene, pentene, hexene, octene, nonene, decene or 4-methyl-1-pentene.
Claim 8
Dependent Claim
27 words
A film as claimed in claim 1, wherein as component (b) is a natural or synthetic resin having a softening point of from 60° to 180° C.
Claim 9
Dependent Claim
33 words
A film as claimed in claim 7, wherein the natural or synthetic resin is selected from rosin, dammar resins, turpentine resins, hydrocarbon resins, ketone resins, phenolic resins, chlorinated aliphatic or aromatic hydrocarbon resins.
Claim 10
Dependent Claim
33 words
A film as claimed in claim 1, wherein as component (c) a mixture of a polyethylene wax and an oxazoline wax prepared from stearic acid and an amino alcohol, preferably tris-hydroxymethylaminomethane, is used.
Claim 11
Dependent Claim
36 words
A film as claimed in claim 1, wherein the base layer contains as incompatible additives of an inorganic additive selected from the group of CaCO 3 , SiO 2 , Na--Al silicate and TiO 2 .
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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) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |