US4965109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low temperature impact and puncture resistant polypropyene films layered films and bags therefrom
Assignee: Glad Products Co
•
Filing: 1988-01-27
•
Granted: 1990-10-23
•
Expires: 2008-01-27
Abstract
Abstract Thermoplastic films and bag structures having improved low temperature impact and puncture resistance properties and high resistance to heat comprise a film layer comprising a blend of polypropylene and a material selected from polyisobutylene, very low density polyethylene, polybutylene, and ethylene-methyl acrylate copolymer, and mixtures thereof. The films and bag structures preferably have an outer film layer of a resin material having a melt temperature which is higher than that of the other film layer. The outer film layer material is preferably a polyester or a polyamide. The films and bag structures are particularly suitable for use as frozen food storage containers and for subsequent heating and/or cooking of food therein.
Inventors
- 👤 Edward B. Tucker
- 👤 Edward N. Biel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:42
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B65; B65D; B65D31/00; B65D31/02; C08L2205/00; C08L2205/03; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08L23/0846; C08L23/0869; C08L23/18; C08L23/20; C08L23/22; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/26; Y10T428/31504; Y10T428/31725; Y10T428/3175; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
88 words
A low temperature impact and puncture resistant thermoplastic multilayer film comprising an inner film layer comprising a blend of (homopolymer) polypropylene with between about 5 percent and about 40 percent by weight of a resin material selected from the group consisting of (a) very low density polyethylene, (b) polybutylene, (c) a copolymer of ethylene-methyl acrylate, and (d) polyisobutylene, based on the weight of said blend; and an outer film layer comprising a resin material having a melting temperature which is higher than that of said inner film layer.
Claim 2
Dependent Claim
88 words
A low temperature impact and puncture resistant thermoplastic multilayer film comprising an inner film layer comprising a blend of (homopolymer) polypropylene with between about 5 percent and about 40 percent by weight of a resin material selected from the group consisting of (a) very low density polyethylene, (b) polybutylene, (c) a copolymer of ethylene-methyl acrylate, and (d) polyisobutylene, based on the weight of said blend; and an outer film layer comprising a resin material having a melting temperature which is higher than that of said inner film layer.
Claim 3
Dependent Claim
50 words
A low temperature impact and puncture resistant thermoplastic multilayer film in accordance with claim 1 wherein said polypropylene resin having a melt flow rate of between about 0.5 decigrams per minute and about 20 decigrams per minute, and a density of between about 0.900 and about 0.910 g/cm 3 .
Claim 4
Dependent Claim
48 words
A low temperature impact and puncture resistant thermoplastic multilayer film in accordance with claim 1 wherein said polyisobutylene has a viscosity average molecular weight (Staudinger Method) of between about 64,000 and about 135,000, an intrinsic viscosity between about 2.4 and about 4.3 and about 0.92 g/cm 3 .
Claim 5
Dependent Claim
41 words
A low temperature impact and puncture resistant thermoplastic multilayer film in accordance with claim 1 wherein said blend contains from between about 5 percent and about 30 percent by weight of said resin material, based on the weight of said blend.
Claim 6
Dependent Claim
39 words
A low temperature impact and puncture resistant thermoplastic multilayer film in accordance with claim 1 wherein said outer film layer comprises a thermoplastic resin material selected from the group consisting of polyesters, polyamides, polysulfones, polyaryl sulfones, and mixtures thereof.
Claim 7
Dependent Claim
26 words
A low temperature impact and puncture resistant thermoplastic multilayer film in accordance with claim 5 wherein said polyesters are selected from polyethylene terephthalate and polybutylene terephthalate.
Claim 8
Dependent Claim
32 words
A low temperature impact and puncture resistant thermoplastic multilayer film in accordance with claim 5 wherein said polyamides are selected from nylon-6, nylon-6/6, nylon-6/9, nylon-6/10, nylon-12, nylon-6/12, and copolymers and mixtures thereof.
Claim 9
Dependent Claim
30 words
A low temperature impact and puncture resistant thermoplastic multilayer film in accordance with claim 1 further including a bonding layer between said inner film layer and said outer film layer.
Claim 10
Dependent Claim
23 words
A low temperature impact and puncture resistant thermoplastic multilayer film in accordance with claim 8 wherein said bonding layer comprises a polyolefin-based resin.
Claim 11
Dependent Claim
27 words
A low temperature impact and puncture resistant thermoplastic multilayer film in accordance with claim 1 having a thickness of from about 0.5 mil to about 10 mils.
Claim 12
Dependent Claim
21 words
A low temperature impact and puncture resistant thermoplastic multilayer film in accordance with claim 1 in the form of a container.
Claim 13
Dependent Claim
22 words
A low temperature impact and puncture resistant thermoplastic multilayer film in accordance with claim 11 wherein said container includes a closure means.
Claim 14
Dependent Claim
32 words
A low temperature impact and puncture resistant thermoplastic multilayer film according to claim 1 wherein said resin material is present in an amount between about 20 and about 40 percent by weight.
Claim 15
Dependent Claim
32 words
A low temperature impact and puncture resistant thermoplastic multilayer film according to claim 13 wherein said resin material is present in an amount between about 20 and about 30 percent by weight.
Claim 16
Dependent Claim
20 words
A low temperature impact and puncture resistant thermoplastic multilayer film according to claim 2 wherein the density is about 0.903.
References Cited (Backward Citations)
GB1453621A
Cited
US4291085A
Cited
FR2377948A1
Cited
US4169910A
Cited
US4401256A
Cited
US4488924A
Cited
US4560598A
Cited
EP0179639A2
Cited
EP0229476A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-22 | 1994-04-23 | 1994-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-22 | 1998-04-23 | 1998-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-22 | 2002-04-23 | 2002-10-23 | $7700.00 | Window Closed / Lapsed |