EP0321220A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Easily openable heat seal material
Assignee: Mitsui Chemicals Inc
•
Filing: 1988-12-14
•
Granted: —
•
Expires: 2008-12-14
Abstract
Abstract A heat seal material having a plurality of resin surfaces which are positioned face to face and can be heat-fused together, at least one of the resin surfaces being formed of a resin composition comprising (A) 30 to 85% by weight of low-density polyethylene having a density of 0.91 to 0.94 g/cm³ and a crystallinity of more than 40%, (B) 5 to 40% by weight of polypropylene, and (C) 10 to 40% by weight of a low-crystalline or substantially amorphous ethylene/alpha-olefin copolymer.
Inventors
- 👤 Masahiro Sugi
- 👤 Takasi Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 13:32
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/322; B32B27/06; B32B27/08; C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/08; C08L23/0807; C08L23/0815; B32B2307/00; B32B2307/30; B32B2307/31; B32B2553/00; C08L2205/00; C08L2205/02; C08L2205/03; C08L23/0846; C08L23/0853; C08L23/0861; C08L23/10; C08L23/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
81 words
A heat seal material having a plurality of resin surfaces which are positioned face to face and can be heat-fused together, at least one of the resin surfaces being formed of a resin composition comprising (A) 30 to 85% by weight of low-density polyethylene having a density of 0.91 to 0.94 g/cm³ and a crystallinity of more than 40%, (B) 5 to 40% by weight of polypropylene, and (C) 10 to 40% by weight of low-crystalline or substantially amorphous ethylene/alpha-olefin copolymer.
Claim 2
Dependent Claim
81 words
A heat seal material having a plurality of resin surfaces which are positioned face to face and can be heat-fused together, at least one of the resin surfaces being formed of a resin composition comprising (A) 30 to 85% by weight of low-density polyethylene having a density of 0.91 to 0.94 g/cm³ and a crystallinity of more than 40%, (B) 5 to 40% by weight of polypropylene, and (C) 10 to 40% by weight of low-crystalline or substantially amorphous ethylene/alpha-olefin copolymer.
Claim 3
Dependent Claim
22 words
A material according to claim 1 in which (A) has a melt flow rate [MFR (L)] of 0.5 to 30 g/10 min.
Claim 4
Dependent Claim
22 words
A material according to claim 2 in which (A) has a melt flow rate [MFR (E)] of 1 to 15 g/10 min.
Claim 5
Dependent Claim
25 words
A material according to claim 1, 2 or 3 in which (B) has a melt flow rate [MFR (L)] to 0.5 to 50 g/10 min.
Claim 6
Dependent Claim
22 words
A material according to claim 4 in which (B) has a melt flow rate [MFR (L)] of 1 to 15 g/10 min.
Claim 7
Dependent Claim
23 words
A material according to any one of the preceding claims in which (C) has an ethylene content of 75 to 95 mole %.
Claim 8
Dependent Claim
21 words
A material according to any one of the preceding claims in which (C) has a crystallinity of not more than 30%.
Claim 9
Dependent Claim
26 words
A material according to any one of the preceding claims in which (C) has a melt flow rate [MFR (E)] of 0.4 to 50 g/10 min.
Claim 10
Dependent Claim
38 words
A material according to any one of the preceding claims in which the resin composition comprises 40 to 75% by weight of (A), 10 to 30% by weight of (B), and 15 to 30% by weight of (C).
Claim 11
Dependent Claim
23 words
A packaging material comprising a heat seal material as claimed in any one of the preceding claims or a heat seal formed therefrom.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.