US4769418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propylene polymer film
Assignee: Mitsubishi Chemical Corp
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Filing: 1987-03-16
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Granted: 1988-09-06
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Expires: 2007-03-16
Abstract
Abstract A propylene polymer film composed of a composition comprising 100 parts by weight of a crystalline propylene polymer and 0.01 to 3 parts by weight of a non-meltable crosslinked silicone resin powder having a mean particle diameter of 0.5 to 7 microns. The film is especially suitable for packaging applications because of its good transparency, antiblocking property, bag openability, slipperiness, appearance and heat-sealability.
Inventors
- 👤 Hajime Mizuno
- 👤 Kazuhiro Fujiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:18
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L23/14; C08L23/142; B32B2323/00; B32B2323/10; C08L2312/00; C08L83/00; C08L83/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
50 words
A propylene polymer film composed of a composition comprising 100 parts by weight of a crystalline propylene polymer and 0.01 to 3 parts by weight of a non-meltable cross-linked organosiloxane resin powder having a mean particle diameter of 0.5 to 7 μm, and having a three-dimensional structure of siloxane linkages.
Claim 2
Dependent Claim
50 words
A propylene polymer film composed of a composition comprising 100 parts by weight of a crystalline propylene polymer and 0.01 to 3 parts by weight of a non-meltable cross-linked organosiloxane resin powder having a mean particle diameter of 0.5 to 7 μm, and having a three-dimensional structure of siloxane linkages.
Claim 3
Dependent Claim
25 words
The propylene polymer film as claimed in claim 1, wherein the crystalline propylene polymer has a melt flow rate of 0.1 to 200 g/10 min.
Claim 4
Dependent Claim
25 words
The propylene polymer film as claimed in claim 1, wherein the crystalline propylene polymer has a melt flow rate of 1 to 50 g/10 min.
Claim 5
Dependent Claim
48 words
The propylene polymer film as claimed in claim 1, wherein the crystalline propylene polymer is a propylene homopolymer, a propylene/ethylene random copolymer or a propylene/ethylene/butene random copolymer each having an ethylene content of 0 to 8% by weight and a butene content of 0 to 25% by weight.
Claim 6
Dependent Claim
33 words
The propylene polymer film as claimed in claim 1, wherein the crystalline propylene polymer is propylene/α-olefin copolymer resins having a fusion peak temperature, determined by the DSC method, of up to 145° C.
Claim 7
Dependent Claim
66 words
The propylene polymer film as claimed in claim 1, wherein the crystalline propylene polymer is at least one propylene/α-olefin copolymer resin selected from the group consisting of propylene/ethylene random copolymer resins havihg an ethylene content of 3 to 8% by weight and propylene/ethylene/butene-1 random copolymer resins having an ethylene content of 0.5 to 5% by weight and a butene-1 content of 3 to 25% by weight.
Claim 8
Dependent Claim
69 words
The propylene polymer film as claimed in any one of claims 1 to 6, wherein the crystalline propylene polymer is in the form of a powder having a true spherical degree f, defined by the equation f=√A/(π/4)/Dmax wherein A is the cross-sectional area (mm 2 ) of the polymer powder, and Dmax is the maximum diameter (mm) of the cross section of the polymer powder, of at least 0.8.
Claim 9
Dependent Claim
23 words
The propylene polymer film as claimed in claim 1, wherein the crystalline propylene polymer has a true spherical degree of at least 0.85.
Claim 10
Dependent Claim
59 words
The propylene polymer film as claimed in claim 1, wherein the non-meltable crosslinked silicone resin powder has a true spherical degree f, defined by the equation f=√A/(π/4)/Dmax wherein A is the cross-sectional area (mm 2 ) of the resin powder, and Dmax is the maximum diameter (mm) of the cross section of the resin powder, of at least 0.8.
Claim 11
Dependent Claim
35 words
The propylene polymer film as claimed in claim 1, wherein the non-meltable crosslinked silicone resin powder has a true spherical degree of at least 0.85 and a mean particle diameter of 1 to 5 microns.
Claim 12
Dependent Claim
26 words
The propylene polymer film as claimed in claim 1, wherein the amount of the non-meltable crosslinked silicone resin powder is 0.01 to 1 part by weight.
Claim 13
Dependent Claim
26 words
The propylene polymer film as claimed in claim 1, wherein the amount of the non-meltable crosslinked silicone resin powder is 0.01 to 0.5 part by weight.
Claim 14
Dependent Claim
26 words
The propylene polymer film as claimed in claim 1, wherein the amount of the non-meltable crosslinked silicone resin powder is 0.02 to 0.3 part by weight.
References Cited (Backward Citations)
US2919474A
Cited
US3655565A
Cited
US3742084A
Cited
US3865897A
Cited
US3898300A
Cited
US4048129A
Cited
SU735613A1
Cited
US4273896A
Cited
JPS55104338A
Cited
US4287108A
Cited
US4292222A
Cited
US4472556A
Cited
JPS60192777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |