EP0180478A1
Expired / Lapsed
EP
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Heat sealable plastics laminate
Assignee: Mitsui Chemicals inc shell Oil Co
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Filing: 1985-10-31
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Granted: —
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Expires: 2005-10-31
Abstract
Abstract A laminated structure comprises a substrate layer of a crystalline propylene resin and, in direct contact with at least one surface of said substrate layer, a heat-sealable layer of a crystalline random propylene copolymer composition composed of (I) a crystalline random propylene copolymer of a major amount of propylene and a minor amount of another alpha-olefin, and (II) a random copolymer which consists enssentially of more than 60 to 99 mol% of propylene and which has: (A) an intrinsic viscosity [η], determined in decalin at 135° C, of 0.5 to 6 dl/g, (B) a DSC melting point (Tm), measured by a differential scanning calorimeter, of 50 to 130° C, (C) a degree of crystallinity, measured by X-ray diffractometry, of 5 to 60%, (D) a boiling methyl acetate-soluble content (W,) of not I more than 2% by weight based on the weight of the copolymer (II), and (E) an n-decane/acetone (1:1 by volume) mixture-soluble content (W 2 ) of less than 4 x [η] -1.2 in % by weight based on the weight of the copolymer (II), the weight ratio of (I):(II) being 5:95 to 90:10.
Inventors
- 👤 Masaki C/O Mitsui Higashi Shataku C4-202 Kohyama
- 👤 Takeshi Muranaka
- 👤 Kunisuke Fukui
- 👤 Norio Kashiwa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 09:06
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/14; C08L23/142; C08L23/18; C08L23/20; C09; C09J; C09J123/00; C09J123/02; C09J123/10; C09J123/16; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/70; B32B2307/704; B32B2323/00; B32B2323/10; C08L23/12; C08L2666/00; C08L2666/02; C08L2666/04; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1352; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
205 words
A laminated structure comprising a substrate layer of crystalline propylene resin and, in direct contact with at least one surface of said substrate layer,a heat-sealable layer of a crystalline random propylene copolymer composition, characterised in that the crystalline random propylene copolymer composition is composed of (I) a crystalline random propylene copolymer of a major amount of propylene and a minor amount of another alpha-olefin, and (II) a random copolymer which consists essentially of more than 60 to 99 mole% of 1-butene and less than 40 to 1 mole% of propylene and which has: (A) an intrinsic viscosity [η], determined in decalin at 135 0 C of from 0.5 to 6 dl/g, (B) a DSC melting point (Tm), measured by a differential scanning calorimeter, of from 50 to 130°C, (C) a degree of crystallinity, measured by X-ray diffractometry, of from 5 to 60% (D) a boiling methyl acetate-soluble content (W1) of not more than 2% by weight based on the weight of the copolymer (II), and (E) an n-decane/acetone (1:1 by volume) mixture-soluble content (W 2 ) of 4 x [q] -1.2 or less in % by weight based on the weight of the copolymer (II), the weight ratio of (I):(II) being from 5:95 to 90:10.
Claim 2
Dependent Claim
205 words
A laminated structure comprising a substrate layer of crystalline propylene resin and, in direct contact with at least one surface of said substrate layer,a heat-sealable layer of a crystalline random propylene copolymer composition, characterised in that the crystalline random propylene copolymer composition is composed of (I) a crystalline random propylene copolymer of a major amount of propylene and a minor amount of another alpha-olefin, and (II) a random copolymer which consists essentially of more than 60 to 99 mole% of 1-butene and less than 40 to 1 mole% of propylene and which has: (A) an intrinsic viscosity [η], determined in decalin at 135 0 C of from 0.5 to 6 dl/g, (B) a DSC melting point (Tm), measured by a differential scanning calorimeter, of from 50 to 130°C, (C) a degree of crystallinity, measured by X-ray diffractometry, of from 5 to 60% (D) a boiling methyl acetate-soluble content (W1) of not more than 2% by weight based on the weight of the copolymer (II), and (E) an n-decane/acetone (1:1 by volume) mixture-soluble content (W 2 ) of 4 x [q] -1.2 or less in % by weight based on the weight of the copolymer (II), the weight ratio of (I):(II) being from 5:95 to 90:10.
Claim 3
Dependent Claim
32 words
A structure according to claim 1 wherein the crystalline random copolymer (I) is composed of from 99 to 85 mole% of propylene and from 1 to 15 mole% of the other alpha-olefin.
Claim 4
Dependent Claim
30 words
A structure according to claim 1 or 2 wherein the crystalline random propylene copolymer (I) has an intrinsic viscosity, determined in decalin at 135°C, of from 1.5 to 4 dl/g.
Claim 5
Dependent Claim
33 words
A structure according to any one of the preceding claims wherein the crystalline random propylene copolymer (I) has a DSC melting point, measured by a differential scanning calorimeter, of from 120 to 155°C.
Claim 6
Dependent Claim
35 words
A structure according to any one of the preceding claims wherein the random copolymer (II) has a (W 2 ) (E) of from 0.1 x [η] -1.2 to 4 x [η] -1.2 % by weight.
Claim 7
Dependent Claim
34 words
A structure according to claim 5 wherein the random copolymer (II) has a (W 2 ) ( E ) of from 0 .2 x [η] -1.2 to 3.5 x [η] -1.2 % by weight.
Claim 8
Dependent Claim
38 words
A structure according to any one of the preceding claims wherein the crystalline propylene resin constituting the substrate layer is a crystalline propylene homopolymer or a crystalline copolymer of propylene with up to 10 mole% of another alpha-olefin.
Claim 9
Dependent Claim
34 words
A structure according to any one of the preceding claims wherein the crystalline propylene resin constituting the substrate layer has an intrinsic viscosity, determined in decalin at 135°C of from 1.5 to 4 dl/g.
Claim 10
Dependent Claim
19 words
A structure according to any one of the preceding claims in the form of a film, sheet or bag.
Claim 11
Dependent Claim
16 words
A crystalline random propylene copolymer composition as defined in any one of claims 1 to 6.
References Cited (Backward Citations)
GB2055688A
Cited
EP0135358A1
Cited
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