EP0192897A2
Expired / Lapsed
EP
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Blend of polyethylene and polypropylene
Assignee: EIDP Inc
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Filing: 1985-12-24
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Granted: —
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Expires: 2005-12-24
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
EP
Data Source
google_patents
Last Synchronized
2026-11-03 17:31
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: 14
Claim 1
Independent Claim
90 words
A blend consisting essentially of low density polyethylene and crystalline polypropylene, characterized in that 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% by 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
90 words
A blend consisting essentially of low density polyethylene and crystalline polypropylene, characterized in that 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% by 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
28 words
A blend as claimed in 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
59 words
A blend as claimed in claim 1 or claim 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
34 words
A blend as claimed in any one of the preceding claims in the form of fiber in which the polyethylene constitutes a continuous phase in which the polypropylene is dispersed as a second phase.
Claim 6
Dependent Claim
43 words
A process for the production of a fiber characterized by melt-spinning of a blend as claimed in any one of claims 1 to 3 at a temperature in the range of 205 to 265°C and at a speed of greater than 1740 meters/min.
Claim 7
Dependent Claim
93 words
A process for producing a nonwoven fabric characterized by melt-spinning a blend as claimed in any one of claims 1 to 3 at a temperature in the range of 205 to 265°C at a speed greater than 1740 meters/ min to form a first fiber, quenching said first fiber, forming a composite web of said first fiber having a higher melting point than the polyethylene component of said first fiber, and compressing said web while heating the web to a temperature above the melting point of the polyethylene component of said first fiber.
Claim 8
Dependent Claim
16 words
A process as claimed in claim 6 in which the second fiber is a polypropylene fiber.
Claim 9
Dependent Claim
17 words
- A process as claimed in claim 6 in which the second fiber is a polyester fiber.
Claim 10
Dependent Claim
34 words
A nonwoven fabric characterized by a fiber having a crystalline polypropylene content of 5 to 35% by weight and a complemental amount of a low density polyethylene having a melt index greater than 30.
Claim 11
Dependent Claim
34 words
A nonwoven fabric characterized by a fiber having a crystalline polypropylene content of 5 to 35% by weight and a complemental amount of a low density polyethylene having a melt index greater than 30.
Claim 12
Dependent Claim
38 words
A nonwoven fabric as claimed in claim 9 in which the only type of fiber in the fabric has a crystalline polypropylene content of 5 to 35% by weight and a complemental amount of a low density polyethylene.
Claim 13
Dependent Claim
18 words
A nonwoven fabric as claimed in claim 9 or claim 10 in which the fabric is pattern bonded.
Claim 14
Dependent Claim
18 words
A nonwoven fabric as claimed in claim 9 or claim 10 in which the fabric is uniformly bonded.
References Cited (Backward Citations)
No citation records indexed.
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