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US4148972A
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US
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Heatsealable polypropylene film laminate
Assignee: Toray Industries Inc
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Filing: 1977-06-22
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Granted: 1979-04-10
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Expires: 1997-06-22
Abstract
Abstract A polypropylene film laminate is made by laminating at least one side of a polypropylene layer comprising 1 -8 wt. % ionomer with an ionomer layer. This film is produced by coextruding polymers from a die, and is useful for automatic packaging applications at high speed.
Inventors
- 👤 Toshihiro Yamane
- 👤 Katsuhiro Tsuchiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:04
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B27/30; B32B27/308; B65; B65D; B65D65/00; B65D65/38; C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; B32B2250/00; B32B2250/24; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/514; B32B2307/518; B32B2323/00; B32B2323/10; B32B2439/00; B32B2439/40; B32B2439/46; B32B2553/00; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12; C08J2423/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
44 words
A heatsealable film laminate adapted for packaging comprising a base layer consisting essentially of a polypropylene-ionomer blend, wherein said blend comprises 92-99 wt. % polypropylene and 1-8 wt. % ionomer, said base layer having an ionomer layer affixed on at least one surface thereof.
Claim 2
Dependent Claim
44 words
A heatsealable film laminate adapted for packaging comprising a base layer consisting essentially of a polypropylene-ionomer blend, wherein said blend comprises 92-99 wt. % polypropylene and 1-8 wt. % ionomer, said base layer having an ionomer layer affixed on at least one surface thereof.
Claim 3
Dependent Claim
19 words
The heatsealable film laminate defined in claim 1 wherein both said base layer and ionomer layer are biaxially oriented.
Claim 4
Dependent Claim
29 words
The heatsealable film laminate defined in claim 1 wherein a plurality of ionomer layers are provided, and wherein said layers are laminated on both sides of the base layer.
Claim 5
Dependent Claim
21 words
The heatsealable film laminate defined in claim 1 wherein the ionomer comprises a metal salt of an ethylene methacrylic acid copolymer.
Claim 6
Dependent Claim
22 words
The heatsealable film laminate defined in claim 1 wherein the ionomer comprises a zinc ion salt of an ethylene methacrylic acid copolymer.
Claim 7
Dependent Claim
24 words
The heatsealable film laminate defined in claim 4 wherein the ethylene content is more than 50 wt. % by total weight of the ionomer.
Claim 8
Dependent Claim
23 words
The heatsealable film laminate defined in claim 4 wherein the ethylene content is 75 to 95 wt. % by weight of the ionomer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |