Patent US4692379A successfully refreshed from Google Patents.
US4692379A
Expired / Lapsed
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Heat sealable film and method for its preparation
Assignee: Mobil Oil AS
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Filing: 1985-09-26
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Granted: 1987-09-08
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Expires: 2005-09-26
Abstract
Abstract An oriented, heat sealable polymer film laminate possessing a low coefficient of friction, good receptivity for water-based coatings and good optical clarity and a method for manufacturing such a laminate are provided.
Inventors
- 👤 Jay K. Keung
- 👤 Kevin M. Donovan
- 👤 Ricardo Balloni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:47
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B27/18; C; C08; C08L; C08L83/00; C09; C09J; C09J123/00; C09J123/02; C09J123/10; C09J123/14; C09J123/142; C09J7/00; C09J7/20; C09J7/22; C09J7/30; C09J7/35; B32B2264/00; B32B2264/10; B32B2264/102; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/514; B32B2307/70; B32B2307/746; B32B2310/00; B32B2310/04; B32B2310/0409; B32B2310/0436; B32B2323/00; B32B2323/10; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
227 words
An oriented, heat sealable polymer film laminate possessing a low coefficient of friction, good receptivity for water-based coatings and good optical clarity which comprises: (a) an upper heat sealable, water-based coating-receiving layer coextensively adherent to the upper surface of a core layer (b), said upper layer (a) being formed from a polymer selected from the group consisting of ethylene-propylene-butene-1 terpolymer, ethylene-propylene random copolymer and blends thereof, said polymer being compounded with an anti-blocking effective amount of anti-blocking agent but being substantially devoid of silicone oil, the exposed surface of upper layer (a) being coated with a coefficient of friction-reducing amount of silicone oil transferred to said surface through contact with a silicone oil coating present upon the exposed surface of a lower heat sealable surface layer (c); (b) a core layer derived from an isotactic polypropylene; and, (c) a lower heat sealable layer coextensively adherent to the lower surface of core layer (b), said lower layer (c) being formed from a polymer selected from the group consisting of ethylene-propylene-butene-1 terpolymer, ethylene-propylene random copolymer and blends thereof, said polymer being compounded with an anti-blocking effective amount of anti-blocking agent and a quantity of silicone oil such that a coefficient of friction-reducing amount thereof will be present on the exposed surface of layer (c) as well as the exposed surface of layer (a) following mutual contact of said surfaces.
Claim 2
Dependent Claim
227 words
An oriented, heat sealable polymer film laminate possessing a low coefficient of friction, good receptivity for water-based coatings and good optical clarity which comprises: (a) an upper heat sealable, water-based coating-receiving layer coextensively adherent to the upper surface of a core layer (b), said upper layer (a) being formed from a polymer selected from the group consisting of ethylene-propylene-butene-1 terpolymer, ethylene-propylene random copolymer and blends thereof, said polymer being compounded with an anti-blocking effective amount of anti-blocking agent but being substantially devoid of silicone oil, the exposed surface of upper layer (a) being coated with a coefficient of friction-reducing amount of silicone oil transferred to said surface through contact with a silicone oil coating present upon the exposed surface of a lower heat sealable surface layer (c); (b) a core layer derived from an isotactic polypropylene; and, (c) a lower heat sealable layer coextensively adherent to the lower surface of core layer (b), said lower layer (c) being formed from a polymer selected from the group consisting of ethylene-propylene-butene-1 terpolymer, ethylene-propylene random copolymer and blends thereof, said polymer being compounded with an anti-blocking effective amount of anti-blocking agent and a quantity of silicone oil such that a coefficient of friction-reducing amount thereof will be present on the exposed surface of layer (c) as well as the exposed surface of layer (a) following mutual contact of said surfaces.
Claim 3
Dependent Claim
13 words
The laminate of claim 1 containing a wax in layer (a) and/or (c).
Claim 4
Dependent Claim
14 words
The laminate of claim 1 containing a microcrystalline wax in layer (a) and/or (c).
Claim 5
Dependent Claim
21 words
The laminate of claim 1 in which the exposed surface of layer (a) is subjected to corona discharge or flame treating.
Claim 6
Dependent Claim
13 words
The laminate of claim 1 in which the silicone oil is a polydialkylsiloxane.
Claim 7
Dependent Claim
13 words
The laminate of claim 1 in which the silicone oil is a polydimethylsiloxane.
Claim 8
Dependent Claim
50 words
The laminate of claim 1 in which a sufficient amount of silicone oil is incorporated in layer (c) as to confer upon the exposed surfaces of layers (a) and (c), following their mutual contact a coefficient of friction of less than about 0.4 up to at least about 60° C.
Claim 9
Dependent Claim
52 words
The laminate of claim 1 in which a sufficient amount of silicone oil is incorporated in layer (c) as to confer upon the exposed surfaces of layers (a) and (c), following their mutual contact a coefficient of friction of from about 0.25 to about 0.3 up to at least about 60° C.
Claim 10
Dependent Claim
26 words
The laminate of claim 1 in which at least a major proportion of the anti-blocking agent is in the form of particles of approximately spherical shape.
Claim 11
Dependent Claim
12 words
The laminate of claim 1 in which the anti-blocking agent is silica.
Claim 12
Dependent Claim
25 words
The laminate of claim 1 in which the anti-blocking agent is silica particles at least a major proportion of which are approximately spherical in shape.
Claim 13
Dependent Claim
33 words
The laminate of claim 1 in which from about 10 to about 70 percent of the total surface area of the anti-blocking agent extends beyond the exposed surface of layers (a) and (c).
Claim 14
Dependent Claim
40 words
The laminate of claim 1 in which the ethylene-propylene-butene-1 terpolymer component of the blend constituting layer (a) and/or (c) is from about 10 to about 90 weight percent thereof with ethylene-propylene random copolymer making up the balance of the blend.
Claim 15
Dependent Claim
40 words
The laminate of claim 1 in which the ethylene-propylene-butene-1 terpolymer component of the blend constituting layer (a) and/or (c) is from about 40 to about 60 weight percent thereof with ethylene-propylene random copolymer making up the balance of the blend.
Claim 16
Dependent Claim
42 words
The laminate of claim 1 in which the ethylene-propylene-butene-1 terpolymer is obtained from the random interpolymerization of from about 1 to about 8 weight percent ethylene with from about 65 to 95 propylene with butene-1 making up the balance of the terpolymer.
Claim 17
Dependent Claim
45 words
The laminate of claim 1 in which the ethylene-propylene-butene-1 terpolymer is obtained from the random interpolymerization of from about 3 to about 6 weight percent ethylene with from about 86 to about 93 weight percent propylene with butene-1 making up the balance of the terpolymer.
Claim 18
Dependent Claim
36 words
The laminate of claim 1 in which the ethylene-propylene random copolymer is obtained from the random co-polymerization of from about 2 to about 7 weight percent ethylene with propylene making up the balance of the copolymer.
Claim 19
Dependent Claim
38 words
The laminate of claim 1 in which layer (b) constitutes at least about 70 percent of the total thickness of the laminate with the balance of the thickness of the laminate being distributed among layers (a) and (c).
Claim 20
Dependent Claim
21 words
The laminate of claim 18 in which the total thickness of the laminate is from about 0.35 to about 2.0 mils.
Claim 21
Independent Claim
200 words
The method of making a polymer laminate which comprises: (1) providing the upper major surface of a core layer (b) derived from an isotactic polypropylene with a coextensive heat sealable, water-based coating-receiving layer (a) formed from a polymer selected from the group consisting of ethylene-propylene-butene-1 terpolymer, ethylene-propylene random copolymer and blends thereof, said polymer being compounded with an anti-blocking effective amount of anti-blocking agent but being substantially devoid of silicone oil; (2) providing the lower major surface of core layer (b) with a coextensive heat sealable surface layer (c) formed from a polymer selected from the group consisting of ethylene-propylene-butene-1 terpolymer, ethylene-propylene random copolymer and blends thereof, said polymer being compounded with an anti-blocking effective amount of anti-blocking agent and a quantity of silicone oil such that a coefficient of friction-reducing amount thereof will be present on the exposed surface of layer (c) as well as the exposed surface of layer (a) following mutual contact of said surfaces; and (3) contacting the exposed surface of layer (c) with the exposed surface of layer (a) such that a coefficient of friction-reducing amount of silicone oil is transferred from the exposed surface of layer (c) to the exposed surface of layer (a).
Claim 22
Independent Claim
200 words
The method of making a polymer laminate which comprises: (1) providing the upper major surface of a core layer (b) derived from an isotactic polypropylene with a coextensive heat sealable, water-based coating-receiving layer (a) formed from a polymer selected from the group consisting of ethylene-propylene-butene-1 terpolymer, ethylene-propylene random copolymer and blends thereof, said polymer being compounded with an anti-blocking effective amount of anti-blocking agent but being substantially devoid of silicone oil; (2) providing the lower major surface of core layer (b) with a coextensive heat sealable surface layer (c) formed from a polymer selected from the group consisting of ethylene-propylene-butene-1 terpolymer, ethylene-propylene random copolymer and blends thereof, said polymer being compounded with an anti-blocking effective amount of anti-blocking agent and a quantity of silicone oil such that a coefficient of friction-reducing amount thereof will be present on the exposed surface of layer (c) as well as the exposed surface of layer (a) following mutual contact of said surfaces; and (3) contacting the exposed surface of layer (c) with the exposed surface of layer (a) such that a coefficient of friction-reducing amount of silicone oil is transferred from the exposed surface of layer (c) to the exposed surface of layer (a).
Claim 23
Dependent Claim
20 words
The method of claim 20 wherein contacting step (3) is carried out by winding the film laminate on a reel.
Claim 24
Dependent Claim
23 words
The method of claim 20 wherein following step (2), the exposed surface of layer (a) is subjected to corona discharge or flame treatment.
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) | 1990-09-07 | 1991-03-09 | 1991-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-07 | 1995-03-09 | 1995-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-07 | 1999-03-09 | 1999-09-08 | $7700.00 | Window Closed / Lapsed |