EP0252718A2
Expired / Lapsed
EP
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Multi-layer polypropylene films
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1987-07-07
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Granted: —
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Expires: 2007-07-07
Abstract
Abstract A polypropylene multi-layer film comprises a crystalline polypropylene substrate layer having laminated to at least one side thereof a sheet of a resin comprising: (A) 10-90% by weight of a propylene random copolymer which: (i) has a comonomer content of 4-15% by weight, (ii) has a Vicat softening point is 122°C or less, and (iii) has a cold xylene-soluble portion content of 15% by weight or less; (B) 10-90% by weight of a copolymer of propylene and an a-olefin having four or more carbon atoms or a copolymer of propylene, an a-olefin having four or more carbon atoms and ethylene which: (i) has a content of the a-olefin having four or more carbon atoms of 8-35 mole%. (ii) has an ethylene content of 5 mole% or less, (iii) has a cold xylene-soluble portion content of 15-70% by weight, and (iv) has a Δhaze of 5% or less; and (C) 0-15% by weight of a highly crystalline polypropylene having a melting point of 150°C or more.
Inventors
- 👤 Masahiro Kakugo
- 👤 Tadatoshi Ogawa
- 👤 Seiichiro Ima
- 👤 Teruaki Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 04:18
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
165 words
A multi-layer polypropylene 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 which: (i) has a comonomer content of 4-15% by weight, (ii) has Vicat softening point of 122°C or less, and (iii) has a cold xylene-soluble portion content of 15% by weight or less; (B) 10-90% by weight of a copolymer of propylene and an a-olefin having four or more carbon atoms or a copolymer of propylene, an a-olefin having four or more carbon atoms and ethylene,which: (i) has a content of the a-olefin having four or more carbon atoms of 8-35 mole%. (ii) has an ethylene content of 5 mole% or less, (iii) has a cold xylene=soluble portion content of 15-70% by weight, and (iv) has a Δhaze of 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
165 words
A multi-layer polypropylene 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 which: (i) has a comonomer content of 4-15% by weight, (ii) has Vicat softening point of 122°C or less, and (iii) has a cold xylene-soluble portion content of 15% by weight or less; (B) 10-90% by weight of a copolymer of propylene and an a-olefin having four or more carbon atoms or a copolymer of propylene, an a-olefin having four or more carbon atoms and ethylene,which: (i) has a content of the a-olefin having four or more carbon atoms of 8-35 mole%. (ii) has an ethylene content of 5 mole% or less, (iii) has a cold xylene=soluble portion content of 15-70% by weight, and (iv) has a Δhaze of 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 multi-layer film as claimed in claim 1, characterized in that the amount of solvent-extractibles in copolymer (B) is 40% by weight or less.
Claim 4
Dependent Claim
39 words
A multi-layer film as claimed in claim 1 or claim 2, characterized in that the resin composition comprises 10-90% by wegiht of copolymer (A), 10-90% by weight of copolymer (B) and 1-15% by weight of highly crystalline polypropylene (C).
Claim 5
Dependent Claim
53 words
A multi-layer film as claimed in any one of claims 1-3 characterised in that the fusion curve, as measured by DSC, has a 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°C to 160°C.
Claim 6
Dependent Claim
26 words
A multi-layer film as claimed in any one of the preceding claims characterized in that the a-olefin of copolymer (B) is butene-1, pentene-1, hexene-1, and/or 4-methylpentene-1.
Claim 7
Dependent Claim
18 words
A multi-layer film as claimed in claim 5 characterized in that the α-olefin of copolymer (B) is butene-1.
Claim 8
Dependent Claim
25 words
A multi-layer film as claimed in any one of the preceding claims characterized in that the multi-layer film is stretched in at least one direction.
Claim 9
Dependent Claim
17 words
A multi-layer film as claimed in claim 7 characterized in that the multi-layer film is biaxially stretched.
References Cited (Backward Citations)
No citation records indexed.
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