US4293608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Olefin packaging laminate
Assignee: Toyobo Co Ltd
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Filing: 1979-10-15
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Granted: 1981-10-06
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Expires: 1999-10-15
Abstract
Abstract A heat sealable packaging material comprising (A) a stretched base layer formed of a propylene polymer and (B) a stretched surface layer formed of a blend of a propylene-ethylene copolymer and a C 4 -C 10 α-olefin-propylene copolymer in a weight proportion of 20:80 to 94:6 by weight on at least one surface of said base layer.
Inventors
- 👤 Tsutomu Isaka
- 👤 Saburoh Kumada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:12
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B27/16; B32B27/18; B32B38/00; B32B38/0008; C; C09; C09D; C09D123/00; C09D123/02; C09D123/10; C09D123/14; C09D123/142; B29; B29K; B29K2995/00; B29K2995/0018; B29K2995/0022; B32B2270/00; B32B2307/00; B32B2307/20; B32B2307/21; B32B2307/30; B32B2307/31; B32B2307/40; B32B2307/406; B32B2307/412; B32B2307/70; B32B2307/714; B32B2307/7145; B32B2307/746; B32B2309/00; B32B2309/08; B32B2309/10; B32B2309/105; B32B2310/00; B32B2310/14; B32B2439/00; B32B2439/70; B32B2553/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10S428/913; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
78 words
A heat sealable material comprising (A) a stretched base layer comprising a propylene polymer and (B) on at least one surface of said base layer a stretched surface layer comprising a blend of a propylene-ethylene copolymer and a C 4 -C 10 α-olefin-propylene copolymer comprising units of C 4 -C 10 α-olefin and units of propylene in a weight proportion of 30:70 to 5:95, said blend being present in a weight proportion of 20:80 to 94:6 by weight.
Claim 2
Dependent Claim
78 words
A heat sealable material comprising (A) a stretched base layer comprising a propylene polymer and (B) on at least one surface of said base layer a stretched surface layer comprising a blend of a propylene-ethylene copolymer and a C 4 -C 10 α-olefin-propylene copolymer comprising units of C 4 -C 10 α-olefin and units of propylene in a weight proportion of 30:70 to 5:95, said blend being present in a weight proportion of 20:80 to 94:6 by weight.
Claim 3
Dependent Claim
27 words
The packaging material according to claim 1, wherein the propylene-ethylene copolymer comprises units of propylene and units of ethylene in a weight proportion of 99.5:0.5 to 90:10.
Claim 4
Dependent Claim
54 words
The packaging material according to any of claims 1 or 2, wherein the base layer (A) comprises further a low molecular weight thermoplastic resin in an amount of 80 to 98 parts by weight to 100 parts by weight of the combined amount of the propylene polymer and the low molecular weight thermoplastic resin.
Claim 5
Dependent Claim
36 words
The packaging material according to claim 3, wherein the low molecular weight thermoplastic resin is the one selected from the group consisting of hydrocarbon resins, rosins, dammars and phenol resins, and their derivatives and modified substances.
Claim 6
Dependent Claim
31 words
The packaging material according to any of claims 1 or 2, wherein the base layer (A) comprises further at least one of an antistatic agent, a lubricant and an anti-blocking agent.
Claim 7
Dependent Claim
31 words
The packaging material according to claim 5, wherein at least one of the surface layers (B) comprises further at least one of an antistatic agent, a lubricant and an anti-blocking agent.
Claim 8
Dependent Claim
30 words
The packaging material according to claim 6, wherein at least one of the surfaces is subjected to electric discharge treatment and has a wetting tension of 30.5 to 58 dyne/cm.
Claim 9
Dependent Claim
50 words
The packaging material according to claim 6, wherein the antistatic agent is incorporated in an amount of 0.5 to 3 parts by weight and a lubricant and an anti-blocking agent in a combined amount of 0.1 to 3 parts by weight to 100 parts by weight of the propylene polymer.
Claim 10
Dependent Claim
30 words
The packaging material according to claim 5, wherein at least one of the surfaces is subjected to electric discharge treatment and has a wetting tension of 30.5 to 58 dyne/cm.
Claim 11
Dependent Claim
50 words
The packaging material according to claim 5, wherein the antistatic agent is incorporated in an amount of 0.5 to 3 parts by weight and a lubricant and an anti-blocking agent in a combined amount of 0.1 to 3 parts by weight to 100 parts by weight of the propylene polymer.
Claim 12
Dependent Claim
43 words
The packaging material according to any of claims 1 or 2, wherein at least one of the surface layers (B) comprises further a silicon oil in an amount of 0.01 to 0.15 part by weight to 100 parts by weight of the blend.
Claim 13
Dependent Claim
31 words
The packaging material according to any of claims 1 or 2, wherein the propylene-ethylene copolymer comprises units of propylene and units of ethylene in a weight proportion of 96.4:3.6 to 90:10.
Claim 14
Dependent Claim
31 words
The packaging material according to any of claims 1 or 2, wherein the α-olefin is the C 4 -C 10 α-olefin-propylene copolymer is at least one of butene-1, pentene and hexene.
Claim 15
Dependent Claim
28 words
The packaging material according to any of claims 1 or 2, wherein at least one of the surface layers (B) has a thickness of 0.2 to 3 microns.
Claim 16
Dependent Claim
28 words
The packaging material according to any of claims 1 or 3, wherein at least one of the surface layers (B) has a thickness of 0.7 to 10 microns.
Claim 17
Dependent Claim
57 words
The packaging material according to any of claims 1 or 2, wherein at least one of the surface layers (B) comprises further a low molecular weight thermoplastic resin in an amount of 25 to 3 parts by weight to 100 parts by weight of the combined amount of the blend and the low molecular weight thermoplastic resin.
Claim 18
Dependent Claim
62 words
The packaging material according to any of claims 1 or 2, wherein the base layer (A) comprises the propylene polymer and the low molecular weight thermoplastic resin in a weight proportion of 80:20 to 98:2 and at least one of the surface layers (B) comprises the blend and the low molecular weight thermoplastic resin in a weight proportion of 75:25 to 97:3.
Claim 19
Dependent Claim
120 words
The packaging material according to claim 17, wherein the base layer (A) comprises further 0.5 to 3 parts by weight of an antistatic agent and 0.1 to 3 parts by weight of at least one of a lubricant and an anti-blocking agent per 100 parts by weight of the combined amount of the propylene polymer and the low molecular weight thermoplastic resin and at least one of the surface layers (B) comprises further 0.5 to 3 parts by weight of an antistatic agent and 0.1 to 3 parts by weight of at least one of a lubricant and an anti-blocking agent per 100 parts by weight of the combined amount of the blend and the low molecular weight thermoplastic resin.
Claim 20
Dependent Claim
30 words
The packaging material according to claim 18, wherein at least one of the surfaces is subjected to electric discharge treatment and has a wetting tension of 30.5 to 58 dyne/cm.
References Cited (Backward Citations)
US3754063A
Cited
US4117193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |