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US4786562A
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Polypropylene multi-layer film
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1987-07-02
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Granted: 1988-11-22
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Expires: 2007-07-02
Abstract
Abstract A polypropylene multi-layer film which comprises a crystalline polypropylene substrate layer having laminated to at least one side thereof a sheet of a resin composition comprising: (A) 10-90% by weight of a propylene random copolymer satisfying that (i) the comonomer content is 4-15% by weight, (ii) the Vicat softening point is 122 DEG C. or less, and (iii) the cold xylene-soluble portion content is 15% by weight or less, (B) 10-90% by weight of a copolymer of propylene and an alpha -olefin having four or more carbon atoms or a copolymer of propylene, an alpha -olefin having four or more carbon atoms and ethylene satisfying that: (i) the content of the alpha -olefin having four or more carbon atoms is 8-35 mole %, (ii) the ethylene content is 5 mole % or less, (iii) the cold xylene-soluble portion content is 15-70% by weight, and (iv) the DELTA haze is 5% or less, and (C) 0-15% by weight of a highly crystalline polypropylene having a melting point of 150 DEG C. or more. This polypropylene multi-layer film has an excellent, low-temperature heat sealing property, a good transparency, a good scratch resistance, and so on.
Inventors
- 👤 Masahiro Kakugo
- 👤 Tadatoshi Ogawa
- 👤 Seiichiro Ima
- 👤 Teruaki Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:33
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; C; C08; C08J; C08J5/00; C08J5/18; C09; C09J; C09J123/00; C09J123/02; C09J123/10; C09J123/14; C09J123/142; C09J123/16; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2307/70; B32B2307/704; B32B2323/00; B32B2323/10; C08L; C08L2666/00; C08L2666/02; C08L2666/04; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
168 words
A polypropylene multi-layer film which comprises a crystalline polypropylene substrate layer having laminated to at least one side thereof a sheet of a resin composition consisting essentially of: (A) 10-90% by weight of a propylene random copolymer satisfying that: (i) the comonomer content is 4-15% by weight, (ii) the Vicat softening point is 122° C. or less, and (iii) the cold xylene-soluble portion content is 15% by weight or less, (B) 10-90% by weight of a copolymer of propylene and an α-olefin having four or more carbon atoms or a copolymer of propylene, an α-olefin having four or more carbon atoms and ethylene satisfying that: (i) the content of the α-olefin having four or more carbon atoms is 8-35 mole %, (ii) the ethylene content is 5 mole % or less, (iii) the cold xylene-soluble portion content is 15-70% by weight, and (iv) the Δhaze is 5% or less, and (C) 0-15% by weight of a highly crystalline polypropylene having a melting point of 150° C. or more.
Claim 2
Dependent Claim
168 words
A polypropylene multi-layer film which comprises a crystalline polypropylene substrate layer having laminated to at least one side thereof a sheet of a resin composition consisting essentially of: (A) 10-90% by weight of a propylene random copolymer satisfying that: (i) the comonomer content is 4-15% by weight, (ii) the Vicat softening point is 122° C. or less, and (iii) the cold xylene-soluble portion content is 15% by weight or less, (B) 10-90% by weight of a copolymer of propylene and an α-olefin having four or more carbon atoms or a copolymer of propylene, an α-olefin having four or more carbon atoms and ethylene satisfying that: (i) the content of the α-olefin having four or more carbon atoms is 8-35 mole %, (ii) the ethylene content is 5 mole % or less, (iii) the cold xylene-soluble portion content is 15-70% by weight, and (iv) the Δhaze is 5% or less, and (C) 0-15% by weight of a highly crystalline polypropylene having a melting point of 150° C. or more.
Claim 3
Dependent Claim
24 words
A polypropylene multi-layer film according to claim 1, wherein the amount of the solvent-extraction in the copolymer (B) is 40% by weight or less.
Claim 4
Dependent Claim
37 words
A polypropylene multi-layer film according to claim 1, wherein the resin composition comprises 10-90% by weight of the copolymer (A), 10-90% by weight of the copolymer (B) and 1-15% by weight of the highly crystalline polypropylene (C).
Claim 5
Dependent Claim
55 words
A polypropylene multi-layer film according to claim 3, wherein the resin composition has the main peak appearing in the range of from 127° to 147° C. and a subpeak appearing in each of the ranges of from 95° to 127° C. and from 147° to 160° C. on a fusion curve as measured by DSC.
Claim 6
Dependent Claim
31 words
A polypropylene multi-layer film according to claim 1, wherein the α-olefin of the copolymer (B) is at least one compound selected from the group consisting of butene-1, pentene-1, hexene-1 and 4-methylpentene-1.
Claim 7
Dependent Claim
17 words
A polypropylene multi-layer film according to claim 5, wherein the α-olefin of the copolymer (B) is butene-1.
Claim 8
Dependent Claim
19 words
A polypropylene multi-layer film according to claim 1, wherein said multi-layer film is stretched in at least one direction.
Claim 9
Dependent Claim
15 words
A polypropylene multi-layer film according to claim 7, wherein said multi-layer film is stretched biaxially.
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) | 1991-11-22 | 1992-05-23 | 1992-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-22 | 1996-05-23 | 1996-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-22 | 2000-05-23 | 2000-11-22 | $7700.00 | Window Closed / Lapsed |