EP0333508A2
Expired / Lapsed
EP
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Food wrap film
Assignee: ExxonMobil Chemical Patents Inc
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Filing: 1989-03-17
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Granted: —
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Expires: 2009-03-17
Abstract
Abstract The invention provides a food wrap film containing a layer of a composition containing : from 20 to 50 wt % of LLDPE; from 1 to 10 wt % of an elastomeric polymer; from 40 to 79 wt % of a copolymer of ethylene and an ethylenically unsaturated ester; the weight percentages being calculated on the total polymer weight; and said film containing a minor amount of additives to provide, in combination with polymer components, an antifogging and anti blocking effect such that the film is transparent and has a controlled amount of residual cling.
Inventors
- 👤 Roth Banerji
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 04:37
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/08; C08L2205/00; C08L2205/03; C08L23/06; C08L23/0807; C08L23/0815; C08L23/10; C08L23/14; C08L23/16; C08L23/18; C08L23/20; C08L23/22; C08L91/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
90 words
Food wrap film containing a layer of a composition containing : from 20 to 50 wt % of LLDPE; from 1 to 10 wt % of an elastomeric polymer; from 40 to 79 wt % of a copolymer of ethylene and an ethylenically unsaturated ester; the weight percentages being calculated on the total polymer weight; and said film containing a minor amount of additives to provide, in combination with polymer components, an antifogging and antiblocking effect such that the film is transparent and has a controlled amount of residual cling.
Claim 2
Dependent Claim
90 words
Food wrap film containing a layer of a composition containing : from 20 to 50 wt % of LLDPE; from 1 to 10 wt % of an elastomeric polymer; from 40 to 79 wt % of a copolymer of ethylene and an ethylenically unsaturated ester; the weight percentages being calculated on the total polymer weight; and said film containing a minor amount of additives to provide, in combination with polymer components, an antifogging and antiblocking effect such that the film is transparent and has a controlled amount of residual cling.
Claim 3
Dependent Claim
41 words
Film according to claim 1 having a thickness of from 10 to 30 micron, a 1 % secant modulus not exceeding 500 MPa, preferably 300 PMa and/or a tensile strength at break not exceeding 75 MPa, preferably less than 50 MPa.
Claim 4
Dependent Claim
38 words
Film according to claims 1 or 2 having a haze percentage of from 0.1 to 5; an elongation of from 400 to 700 %; and a snap-back of from 20 to 70 recovery after elongation by 100 %.
Claim 5
Dependent Claim
37 words
Film according to any of the preceding claims in which the elastomeric polymer is a polymer containing isobutylene derived units, VLDPE, or an ethylene-propylene rubber with suitable rheological properties and compatible to provide a low haze blend.
Claim 6
Dependent Claim
63 words
Film according to any of the preceding claims in which the film has, coextruded with a first polymeric composition as defined in claim 1, a second layer of a polymer or polymer compositions having a higher crystallinity for improved film behaviour under automatic processing, the additives being provided at least in an outer layer or buyers, the film being made preferably by casting.
Claim 7
Dependent Claim
40 words
Film according to any of the preceding claims in which the LLDPE is present at from 25 to 40 %; the MI is from 0.4 to 4, preferably from 0.5 to 0.8, and the density is from 0.90 to 0.93.
Claim 8
Dependent Claim
60 words
Film according to any of the preceding claims in which the unsaturated ethylenically ester is VA and the copolymer contains from 5 to 15 % of VA, preferably from 8 to 14 % VA and optionally more than 10 % VA; the MI is from 0.3 to 7 and preferably from 0.5 to 5 and especially from 2 to 4.
Claim 9
Dependent Claim
42 words
Film according to any of the preceding claims in which the elastomer is an olefin polymer of a higher olefin monomer from C4 to C13 and preferably polyisobutylene or polybutylene said olefin polymer preferably having a Mv 30 000 to 80 000.
Claim 10
Dependent Claim
51 words
Film according to any of the preceding claims in which one additive is glycerine mono-oleate, preferably in an amount of from 0.5 to 3 % having principally an antifogging effect; and/or another additive is castor oil, preferably in an amount of from 0.5 to 1.5 % having principally an antiblocking effect.
Claim 11
Dependent Claim
21 words
Film according to claim 5 in which the second layers are coextruded and contain EVA, LLDPE, LDPE, VLDPE or blends thereof.
Claim 12
Dependent Claim
51 words
Cling wrap film containing a layer of EVA and from 1 to 10 % of butylene polymer characterised in that the Mv of the butylene polymer is from 30000 to 80000 and the film additionally contains from 20 to 50 % of LLDPE and suitable cling preserving antifogging and antiblocking agents.
Claim 13
Dependent Claim
51 words
Cling wrap film containing a layer of EVA and from 1 to 10 % of butylene polymer characterised in that the Mv of the butylene polymer is from 30000 to 80000 and the film additionally contains from 20 to 50 % of LLDPE and suitable cling preserving antifogging and antiblocking agents.
References Cited (Backward Citations)
No citation records indexed.
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