US4230831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene blend composition
Assignee: Asahi Kasei Corp
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Filing: 1979-09-25
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Granted: 1980-10-28
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Expires: 1999-09-25
Abstract
Abstract An intimately melted and homogenized polyethylene composition having excellent physical properties and moldability and comprising a high-medium density polyethylene having a high molecular weight (A), a high-medium density polyethylene having a low molecular weight (B) and a low density polyethylene (C) characterized in that: (i) the average molecular weight of (A) is 100,000-1,000,000, the average molecular weight of (B) is 1,000-100,000, the molecular weight ratio of (A) to (B) is 5-200, and (C) has an intrinsic viscosity [η] of 0.70 dl/g or more in decalin at 135° C. and an expansion factor of 3.3 or more, and (ii) the mixing ratio (A)/(B) is 30/70 to 80/20 and the mixing ratio of (C) in the composition is within the range from 1% by weight to less than 15% by weight.
Inventors
- 👤 Hisaya Sakurai
- 👤 Yoshihiko Katayama
- 👤 Tadashi Ikegami
- 👤 Kisoo Moriguchi
- 👤 Shigeru Mizutani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:35
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L2205/00; C08L2205/02; C08L2205/025; C08L2205/03
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
124 words
An intimately melted and homogenized polyethylene composition comprising a high-medium density polyethylene having a high molecular weight (A), a high-medium density polyethylene having a low molecular weight (B) and a low density polyethylene (C): (i) the average molecular weight of said (A) being 100,000-1,000,000, the average molecular weight of said (B) being 1,000-100,000, the molecular weight ratio of (A) to (B) being 5 to 200, and said (C) having an intrinsic viscosity [η] of 0.70 dl/g or more in decalin at 135° C. and an expansion factor of 3.3 or more; and (ii) the mixing ratio (A)/(B) being 30/70 to 80/20 and the mixing ratio of (C) in the composition being within the range from 1% by weight to less than 15% by weight.
Claim 2
Dependent Claim
124 words
An intimately melted and homogenized polyethylene composition comprising a high-medium density polyethylene having a high molecular weight (A), a high-medium density polyethylene having a low molecular weight (B) and a low density polyethylene (C): (i) the average molecular weight of said (A) being 100,000-1,000,000, the average molecular weight of said (B) being 1,000-100,000, the molecular weight ratio of (A) to (B) being 5 to 200, and said (C) having an intrinsic viscosity [η] of 0.70 dl/g or more in decalin at 135° C. and an expansion factor of 3.3 or more; and (ii) the mixing ratio (A)/(B) being 30/70 to 80/20 and the mixing ratio of (C) in the composition being within the range from 1% by weight to less than 15% by weight.
Claim 3
Dependent Claim
45 words
A polyethylene composition according to claim 1, wherein the high molecular weight component (A) has an average molecular weight of 300,000-800,000, the low molecular weight component (B) has an average molecular weight of 5,000-50,000 and the molecular weight ratio between (A) and (B) is 10-100.
Claim 4
Dependent Claim
30 words
A polyethylene composition according to claim 1, wherein the low density polyethylene (C) has an intrinsic viscosity of 0.85 dl/g or more and an expansion factor of 3.3 or more.
Claim 5
Dependent Claim
30 words
A polyethylene composition according to claim 2, wherein the low density polyethylene (C) has an intrinsic viscosity of 0.85 dl/g or more and an expansion factor of 3.3 or more.
Claim 6
Dependent Claim
26 words
A polyethylene composition according to claim 1, wherein the ratio of high molecular weight component (A) to low molecular weight component (B) is 40/60 to 70/30.
Claim 7
Dependent Claim
26 words
A polyethylene composition according to claim 2, wherein the ratio of high molecular weight component (A) to low molecular weight component (B) is 40/60 to 70/30.
Claim 8
Dependent Claim
26 words
A polyethylene composition according to claim 3, wherein the ratio of high molecular weight component (A) to low molecular weight component (B) is 40/60 to 70/30.
Claim 9
Dependent Claim
26 words
A polyethylene composition according to claim 4, wherein the ratio of high molecular weight component (A) to low molecular weight component (B) is 40/60 to 70/30.
Claim 10
Dependent Claim
28 words
A polyethylene composition according to claim 1, wherein the mixing ratio of low density polyethylene (C) in the composition is from 3% by weight to 10% by weight.
Claim 11
Dependent Claim
28 words
A polyethylene composition according to claim 2, wherein the mixing ratio of low density polyethylene (C) in the composition is from 3% by weight to 10% by weight.
Claim 12
Dependent Claim
28 words
A polyethylene composition according to claim 3, wherein the mixing ratio of low density polyethylene (C) in the composition is from 3% by weight to 10% by weight.
Claim 13
Dependent Claim
28 words
A polyethylene composition according to claim 4, wherein the mixing ratio of low density polyethylene (C) in the composition is from 3% by weight to 10% by weight.
Claim 14
Dependent Claim
28 words
A polyethylene composition according to claim 5, wherein the mixing ratio of low density polyethylene (C) in the composition is from 3% by weight to 10% by weight.
Claim 15
Dependent Claim
28 words
A polyethylene composition according to claim 6, wherein the mixing ratio of low density polyethylene (C) in the composition is from 3% by weight to 10% by weight.
Claim 16
Dependent Claim
28 words
A polyethylene composition according to claim 7, wherein the mixing ratio of low density polyethylene (C) in the composition is from 3% by weight to 10% by weight.
Claim 17
Dependent Claim
28 words
A polyethylene composition according to claim 8, wherein the mixing ratio of low density polyethylene (C) in the composition is from 3% by weight to 10% by weight.
Claim 18
Dependent Claim
14 words
A product which has been molded by the use of composition of claim 1.
Claim 19
Dependent Claim
13 words
A product which has been blow molded from the composition of claim 1.
Claim 20
Dependent Claim
12 words
A product which has been extruded from the composition of claim 1.
Claim 21
Dependent Claim
13 words
A film which has been inflation molded from the composition of claim 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) | 1983-10-28 | 1984-04-28 | 1984-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-28 | 1988-04-28 | 1988-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-28 | 1992-04-28 | 1992-10-28 | $7700.00 | Window Closed / Lapsed |