Patent US2273497A successfully refreshed from Google Patents.
US4336352A
Expired / Lapsed
US
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Blend of three ethylene polymers
Assignee: Asahi Kasei Corp
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Filing: 1980-08-11
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Granted: 1982-06-22
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Expires: 2000-08-11
Abstract
Abstract A polyethylene composition comprising a mixture of three kinds of polyethylenes (A), (B) and (C) characterized in that: (i) the viscosity average molecular weight of (A) is 1,000-100,000, the viscosity average molecular weight of (B) is 100,000-1,000,000, the viscosity average molecular weight of (C) is 400,000-6,000,000, the molecular weight ratio of (B) to (A), i.e. B/A, is 2-200 and the molecular weight ratio of (C) to (B), i.e. C/B, is 1.5 or more. (ii) the mixing ratio of (A) to (B) is 30/70 to 70/30 and the mixing ratio of (C) is 1-10% by weight based on the total composition, and (iii) the melt index of the composition is 0.001-1, and a process for producing said composition. This polyethylene composition is excellent in physical properties in that it has an appropriate die swell, a high melt tension and an excellent moldability and exhibits a high stiffness and a high ESCR.
Inventors
- 👤 Hisaya Sakurai
- 👤 Yoshihiko Katayama
- 👤 Tadashi Ikegami
- 👤 Shigeru Mizutani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:10
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/02; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08F210/00; C08F210/16; C08L2205/00; C08L2205/02; C08L2205/03
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
146 words
A composition comprising a mixture of three polymers (A), (B) and (C) which are selected from the group consisting of homopolymers of ethylene and copolymers of ethylene with a member selected from the group consisting of propylene, butene, pentene, 4-methylpentene-1, hexene, octene, and decene, the composition being characterized in that: (i) the viscosity average molecular weight of (A) is 1,000-100,000, the viscosity average molecular weight of (B) is 100,000-1,000,000, the viscosity average molecular weight of (C) is 400,000-6,000,000, the molecular weight ratio of (B) to (A), (B/A), is 2-200, and the molecular weight ratio of (C) to (B), (C/B), is 1.5 or more, (ii) the mixing ratio of (A) to (B), (A/B), is 30/70 to 70/30 and the mixing ratio of (C) to the total composition is 1-10% by weight, (iii) melt index of the composition is 0.001-1, and (iv) density of the composition is 0.976-0.935.
Claim 2
Dependent Claim
146 words
A composition comprising a mixture of three polymers (A), (B) and (C) which are selected from the group consisting of homopolymers of ethylene and copolymers of ethylene with a member selected from the group consisting of propylene, butene, pentene, 4-methylpentene-1, hexene, octene, and decene, the composition being characterized in that: (i) the viscosity average molecular weight of (A) is 1,000-100,000, the viscosity average molecular weight of (B) is 100,000-1,000,000, the viscosity average molecular weight of (C) is 400,000-6,000,000, the molecular weight ratio of (B) to (A), (B/A), is 2-200, and the molecular weight ratio of (C) to (B), (C/B), is 1.5 or more, (ii) the mixing ratio of (A) to (B), (A/B), is 30/70 to 70/30 and the mixing ratio of (C) to the total composition is 1-10% by weight, (iii) melt index of the composition is 0.001-1, and (iv) density of the composition is 0.976-0.935.
Claim 3
Dependent Claim
14 words
A composition according to claim 1, wherein melt index of the composition is 0.005-0.5.
Claim 4
Dependent Claim
16 words
A composition according to claim 1, wherein the viscosity average molecular weight of (C) is 600,000-4,000,000.
Claim 5
Dependent Claim
37 words
A composition according to claim 1, wherein the viscosity average molecular weight of (A) is 5,000-70,000, the viscosity average molecular weight of (B) is 300,000-800,000 and the molecular weight ratio of (B) to (A), (B/A), is 5-100.
Claim 6
Dependent Claim
20 words
A composition according to claim 1, wherein the molecular weight ratio of (C) to (B), (C/B), is 2 or more.
Claim 7
Dependent Claim
21 words
A composition according to claim 1, wherein the mixture ratio of (C) is 3-8% by weight based on the total composition.
Claim 8
Dependent Claim
18 words
A composition according to claim 1, wherein each of (A), (B) and (C) is a homopolymer of ethylene.
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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) | 1985-06-21 | 1985-12-21 | 1986-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-21 | 1989-12-21 | 1990-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-21 | 1993-12-21 | 1994-06-22 | $7700.00 | Window Closed / Lapsed |