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Patent US4514534A successfully refreshed from Google Patents.
US4514534A
Expired / Lapsed
US
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Modified polypropylene for film
Assignee: Sunoco Inc R&M
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Filing: 1984-04-13
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Granted: 1985-04-30
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Expires: 2004-04-13
Abstract
Abstract An improved polypropylene blend for biaxial orientation into thin films is made by combining low molecular weight polypropylene, a peroxide agent, a nucleating agent, and linear low density polyethylene in a pelletizing extruder.
Inventors
- 👤 Victor M. DiNardo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:06
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/14; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08L2312/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
112 words
A modified polypropylene useful for making film comprising propylene homopolymer having a melt flow of about 2.0 to about 5.0 g/10 min.(L) said propylene homopolymer formed by cracking a lower melt flow polypropylene using a peroxide agent selected from the group consisting of dialkyl peroxides in an amount of about 50 pm to about 300 ppm, about 0.10% to about 0.25% bis(alkylbenzylidene) sorbitol nucleating agent wherein the alkyl groups have about 2-18 carbon atoms, and about 0.25% to about 2.0% linear low density polyethylene having a melting point of about 120° C. and comprising ethylene copolymerized with about 0.5% to about 7% olefin monomers having about 4 to about 8 carbon atoms.
Claim 2
Dependent Claim
112 words
A modified polypropylene useful for making film comprising propylene homopolymer having a melt flow of about 2.0 to about 5.0 g/10 min.(L) said propylene homopolymer formed by cracking a lower melt flow polypropylene using a peroxide agent selected from the group consisting of dialkyl peroxides in an amount of about 50 pm to about 300 ppm, about 0.10% to about 0.25% bis(alkylbenzylidene) sorbitol nucleating agent wherein the alkyl groups have about 2-18 carbon atoms, and about 0.25% to about 2.0% linear low density polyethylene having a melting point of about 120° C. and comprising ethylene copolymerized with about 0.5% to about 7% olefin monomers having about 4 to about 8 carbon atoms.
Claim 3
Dependent Claim
11 words
Biaxially oriented sheet made from the modified polypropylene of claim 1.
Claim 4
Dependent Claim
11 words
Biaxially oriented film made from the modified polypropylene of claim 1.
Claim 5
Dependent Claim
14 words
The modified polypropylene of claim 1 wherein the cracking takes place in an extruder.
Claim 6
Dependent Claim
88 words
Biaxially oriented sheet comprising (a) propylene homopolymer having a melt flow of about 2 to about 5, (b) about 0.1% to about 0.25% bis(alkylbenzylidene) sorbitol wherein the alkyl groups have about 2-18 carbon atoms, and (c) about 0.25% to about 2% copolymer of ethylene and about 0.5% to about 7% olefin monomers having about 4 to about 8 carbon atoms, the propylene homopolymer having a molecular weight distribution of about 2 to about 4 and the composition as a whole having a crystallization temperature of about 120° C.
Claim 7
Dependent Claim
88 words
Biaxially oriented sheet comprising (a) propylene homopolymer having a melt flow of about 2 to about 5, (b) about 0.1% to about 0.25% bis(alkylbenzylidene) sorbitol wherein the alkyl groups have about 2-18 carbon atoms, and (c) about 0.25% to about 2% copolymer of ethylene and about 0.5% to about 7% olefin monomers having about 4 to about 8 carbon atoms, the propylene homopolymer having a molecular weight distribution of about 2 to about 4 and the composition as a whole having a crystallization temperature of about 120° C.
Claim 8
Dependent Claim
86 words
Polypropylene useful for making film, made by the process comprising cracking a polypropylene having a melt flow lower than 5.0 g/10 min.(L) with a dialkyl peroxide in the presence of about 0.10% to about 0.25% sorbitol nucleating agent and about 0.25% to about 2.0% linear low density polyethylene comprising ethylene copolymerized with about 0.5% to about 7% olefin monomers having about 4 to about 8 carbon atoms, to effect an increase in the polypropylene crystallization temperature to coincide approximately with the melting point of the polyethylene.
Claim 9
Dependent Claim
86 words
Polypropylene useful for making film, made by the process comprising cracking a polypropylene having a melt flow lower than 5.0 g/10 min.(L) with a dialkyl peroxide in the presence of about 0.10% to about 0.25% sorbitol nucleating agent and about 0.25% to about 2.0% linear low density polyethylene comprising ethylene copolymerized with about 0.5% to about 7% olefin monomers having about 4 to about 8 carbon atoms, to effect an increase in the polypropylene crystallization temperature to coincide approximately with the melting point of the polyethylene.
Claim 10
Dependent Claim
12 words
Polypropylene of claim 6 wherein the cracking takes place in an extruder.
Claim 11
Dependent Claim
26 words
Polypropylene of claim 6 wherein the crystallization temperature of the polypropylene and the melting point of the linear low density polyethylene are both about 120° C.
Claim 12
Dependent Claim
10 words
Biaxially oriented sheet made from the polypropylene of claim 6.
Claim 13
Dependent Claim
10 words
Biaxially oriented sheet made from the polypropylene of claim 7.
Claim 14
Dependent Claim
10 words
Biaxially oriented sheet made from the polypropylene of claim 8.
Claim 15
Dependent Claim
10 words
Biaxially oriented film made from the polypropylene of claim 6.
Claim 16
Dependent Claim
10 words
Biaxially oriented film made from the polypropylene of claim 7.
Claim 17
Dependent Claim
10 words
Biaxially oriented film made from the polypropylene of claim 8.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-29 | 1988-10-29 | 1989-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-29 | 1992-10-29 | 1993-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-29 | 1996-10-29 | 1997-04-30 | $7700.00 | Window Closed / Lapsed |