US5468440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making oriented film or structure
Assignee: ExxonMobil Chemical Patents Inc
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Filing: 1994-05-06
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Granted: 1995-11-21
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Expires: 2014-05-06
Abstract
Abstract Applications of isotactic polypropylene resin compositions produced from metallocene catalyst wherein the resins yield articles with comparable shear modulus and heat distortion temperature values to those of conventional polypropylene, but in which the fabrication of the article is achieved at temperatures much lower than possible for conventional polypropylene.
Inventors
- 👤 James J. McAlpin
- 👤 Jeffrey W. C. Kuo
- 👤 Donald C. Hylton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:48
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/28; D01F6/30; B; B29; B29C; B29C55/00; B29C55/005; C; C08; C08J; C08J5/00; C08J5/18; D01F6/02; D01F6/04; D01F6/06; D01F6/44; D01F6/46; B29K; B29K2023/00; B29K2023/10; B29K2023/12; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
57 words
A process for forming an oriented structure comprising the steps of: (a) forming a structure from a polypropylene resin, said polypropylene resin produced from a metallocene catalyst; and, (b) orienting the structure by applying stress at a temperature in the range of from about 20° C. to about 35° C. above the HDT value of the polypropylene.
Claim 2
Dependent Claim
57 words
A process for forming an oriented structure comprising the steps of: (a) forming a structure from a polypropylene resin, said polypropylene resin produced from a metallocene catalyst; and, (b) orienting the structure by applying stress at a temperature in the range of from about 20° C. to about 35° C. above the HDT value of the polypropylene.
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein the temperature range is from about 20° C. to about 30° C. above the HDT of the polypropylene.
Claim 4
Dependent Claim
24 words
The process of claim 2 wherein the temperature range is from about 25° C. to about 30° C. above the HDT of the polypropylene.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein the polypropylene is a homopolymer.
Claim 6
Dependent Claim
26 words
The process of claim 1 wherein the polypropylene is a copolymer of propylene and at least one comonomer having between 2 and about 20 carbon atoms.
Claim 7
Dependent Claim
24 words
The process of claim 5 wherein the propylene copolymer has a comonomer content in the range of about 0.5 to about 10 weight percent.
Claim 8
Dependent Claim
19 words
The process of claim 5 wherein the copolymer is selected from the group consisting of propylene/ethylene, propylene/butene, and propylene/hexene.
Claim 9
Dependent Claim
16 words
The process of claim 1 wherein the polypropylene is a blend of polypropylene and another polymer.
Claim 10
Dependent Claim
21 words
The process of claim 1 wherein the metallocene comprises a silicon-bridged bis(substituted indenyl) Group 4, 5, or 6 transition metal dihalide.
Claim 11
Dependent Claim
28 words
The process of claim 9 wherein the metallocene is selected from the group consisting of dimethylsilylbis(2-methylindenyl) zirconium dichloride, dimethylsilylbis(2-methyl-4,5-benzindenyl) zirconium dichloride, dimethylsilylbis(2-methyl-4,6-diisopropylindenyl) zirconium dichloride, and dimethylsilylbis(2-methyl-4-phenylindenyl) zirconium dichloride.
Claim 12
Dependent Claim
12 words
The process of claim 10 wherein the metallocene is dimethylsilylbis(2-methyl-4,5-benzindenyl) zirconium dichloride.
Claim 13
Dependent Claim
14 words
The process of claim 9 wherein the metallocene is supported on an inert carrier.
Claim 14
Dependent Claim
68 words
A process for forming an oriented film comprising the steps of: (a) forming a film or sheet comprising at least one first layer of a polypropylene resin, said polypropylene resin produced from a metallocene catalyst; and, (b) stretching the film or sheet by applying stress at a temperature in the range of from about 20° C. to about 35° C. above the HDT value of the polypropylene resin.
Claim 15
Dependent Claim
68 words
A process for forming an oriented film comprising the steps of: (a) forming a film or sheet comprising at least one first layer of a polypropylene resin, said polypropylene resin produced from a metallocene catalyst; and, (b) stretching the film or sheet by applying stress at a temperature in the range of from about 20° C. to about 35° C. above the HDT value of the polypropylene resin.
Claim 16
Dependent Claim
33 words
The process of claim 13 wherein the film or sheet prior to stretching further comprises at least one other layer of some polymer having a lower melting point than the first polypropylene layer.
Claim 17
Dependent Claim
50 words
A process for forming an oriented structure comprising the steps of (a) forming a structure from a polypropylene resin, said polypropylene produced from a metallocene catalyst; and, (b) orienting the structure by applying stress at a temperature not to exceed about 35° C. above the HDT value of the polypropylene.
Claim 18
Dependent Claim
50 words
A process for forming an oriented structure comprising the steps of (a) forming a structure from a polypropylene resin, said polypropylene produced from a metallocene catalyst; and, (b) orienting the structure by applying stress at a temperature not to exceed about 35° C. above the HDT value of the polypropylene.
Claim 19
Dependent Claim
12 words
The process of claim 1 wherein the oriented structure is a fiber.
Claim 20
Dependent Claim
13 words
The process of claim 1 wherein the oriented structure is a molded article.
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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) | 1998-11-20 | 1999-05-22 | 1999-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-11-20 | 2003-05-22 | 2003-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-11-20 | 2007-05-22 | 2007-11-21 | $7700.00 | Window Closed / Lapsed |