US4634739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blend of polyethylene and polypropylene
Assignee: EIDP Inc
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Filing: 1985-10-22
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Granted: 1987-01-06
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Expires: 2005-10-22
Abstract
Abstract A blend of low density polyethylene and crystalline polypropylene can be melt spun at high temperature and high speed to produce a fiber. The fiber has utility as a binder fiber in nonwoven fabrics. The blend contains 5 to 35% by weight polypropylene and 95 to 65% of polyethylene.
Inventors
- 👤 George Vassilatos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:58
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/10; C08L23/12; D; D01; D01F; D01F6/00; D01F6/44; D01F6/46; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4282; D04H1/4291; D04H1/4326; D04H1/435; D04H1/54; D04H1/541; D04H3/00; D04H3/08; D04H3/16; C08L2203/00; C08L2203/12; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/69; Y10T442/692
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
92 words
In a blend consisting essentially of low density polyethylene and crystalline polypropylene, the improvement wherein the polyethylene amounts to 65 to 95% by weight of the blend and has a density in the range of 0.90 to 0.92 g/cm 3 , a melting temperature of less than 107° C. and a melt index of at least 25, and the polypropylene amounts to 5 to 35% of weight of the blend and has a melt flow rate of at least 3, and a ratio of weight-to-number average molecular weight of at least 4.
Claim 2
Dependent Claim
92 words
In a blend consisting essentially of low density polyethylene and crystalline polypropylene, the improvement wherein the polyethylene amounts to 65 to 95% by weight of the blend and has a density in the range of 0.90 to 0.92 g/cm 3 , a melting temperature of less than 107° C. and a melt index of at least 25, and the polypropylene amounts to 5 to 35% of weight of the blend and has a melt flow rate of at least 3, and a ratio of weight-to-number average molecular weight of at least 4.
Claim 3
Dependent Claim
26 words
A blend of claim 1 wherein the polyethylene amounts to 75 to 85% and the polypropylene amounts to 15 to 25% by weight of the blend.
Claim 4
Dependent Claim
57 words
A blend of claim 1 or 2 wherein the polyethylene density, melting temperature and melt index are respectively in the ranges of 0.905 to 0.913 g/cm 3 , 102° to 106° C., and 30 to 70, the polypropylene melt flow rate is less than 35, and the polypropylene ratio of average molecular weights is less than 12.
Claim 5
Dependent Claim
30 words
A blend of claim 1 or 2 in the form of fiber in which the polyethylene constitutes a continuous phase in which the polypropylene is dispersed as a second phase.
References Cited (Backward Citations)
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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) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |