US4465812A
Expired / Lapsed
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Linear medium- or low-density polyethylene composition
Assignee: Asahi Kasei Corp
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Filing: 1982-09-29
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Granted: 1984-08-14
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Expires: 2002-09-29
Abstract
Abstract A modified linear medium- or low-density polyethylene composition obtained by uniformly melt kneading a mixture of a linear medium- or low-density polyethylene having a density of not less than 0.90 g/cm 3 but less than 0.94 g/cm 3 and a melt index (MI) 1 of not more than 3 g/10 minutes and a radical initiator in an amount of not less than 0.0005% by weight but less than 0.1% by weight based on the weight of the linear medium- or low-density polyethylene at a temperature of from the melting point of the linear medium- or low-density polyethylene to a temperature of less than the thermal decomposition temperature of the linear medium- or low-density polyethylene to such an extent that the ratio of the melt index of the modified linear medium- or low-density polyethylene composition (MI) 2 to that of the linear medium- or low-density polyethylene (MI) 1 [(MI) 2 /(MI) 1 ] is 0.05 to 0.9.
Inventors
- 👤 Kisoo Moriguchi
- 👤 Isaburo Fukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:25
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/14; B; B29; B29C; B29C48/00; B29C48/25; B29C48/92; C08F; C08F8/00; C08J; C08J3/00; C08J3/24; C08J5/00; C08J5/18; B29C2948/00; B29C2948/92; B29C2948/92504; B29C2948/92514; B29C2948/92704; B29C48/022; B29C48/78; B29C48/80; B29C48/802; C08F2800/00; C08F2800/20; C08F2810/00; C08F2810/10; C08F2810/20; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
176 words
A modified linear medium- or low-density ethylene copolymer composition obtained by uniformly melt kneading a mixture of a linear medium- or low-density copolymer of ethylene and 2.6 to 25% by weight of an α-olefin, having a density of not less than 0.90 g/cm 3 but less than 0.94 g/cm 3 and a melt index (MI) 1 of not more than 3 g/10 minutes, and at least one peroxide radical initiator in an amount of not less than 0.0005% by weight but less than 0.1% by weight based on the weight of the linear medium- or low-density copolymer in the substantial absence of oxygen at a temperature of from the melting point of the linear medium- or low-density copolymer to a temperature of less than the thermal decomposition temperature of the linear medium- or low-density copolymer for a time such that the ratio of the melt index of the modified linear medium-or low-density copolymer composition (MI) 2 to that of the linear medium- or low-density copolymer (MI) 1 ((MI) 2 /(MI) 1 ) is 0.05 to 0.9.
Claim 2
Dependent Claim
176 words
A modified linear medium- or low-density ethylene copolymer composition obtained by uniformly melt kneading a mixture of a linear medium- or low-density copolymer of ethylene and 2.6 to 25% by weight of an α-olefin, having a density of not less than 0.90 g/cm 3 but less than 0.94 g/cm 3 and a melt index (MI) 1 of not more than 3 g/10 minutes, and at least one peroxide radical initiator in an amount of not less than 0.0005% by weight but less than 0.1% by weight based on the weight of the linear medium- or low-density copolymer in the substantial absence of oxygen at a temperature of from the melting point of the linear medium- or low-density copolymer to a temperature of less than the thermal decomposition temperature of the linear medium- or low-density copolymer for a time such that the ratio of the melt index of the modified linear medium-or low-density copolymer composition (MI) 2 to that of the linear medium- or low-density copolymer (MI) 1 ((MI) 2 /(MI) 1 ) is 0.05 to 0.9.
Claim 3
Dependent Claim
16 words
The composition as claimed in claim 1, wherein (MI) 2 /(MI) 1 is 0.05 to 0.7.
Claim 4
Dependent Claim
21 words
The composition as claimed in claim 1, wherein (MI) 2 /(MI) 1 is more than 0.5 but not more an 0.9.
Claim 5
Dependent Claim
22 words
The composition as claimed in claim 1, wherein the density of the copolymer is 0.91 g/cm 3 to 0.935 g/cm 3 .
Claim 6
Dependent Claim
18 words
The composition as claimed in claim 1, wherein the radical initiator is di-tert-butylperoxide, dicumylperoxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne or 1,3-bis(tert-butylperoxyisopropyl)benzene.
Claim 7
Dependent Claim
19 words
The composition as claimed in claim 1, wherein the α-olefin is propylene, butene-1, pentene-1, hexene-1, 4-methylpentene-1, octene-1 or decene-1.
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) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |