EP0048227A2
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Stretched thermoplastic material based on polyethylene and a process for its production
Assignee: Neste Polyeten Te Stenungsund Zweden AB
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Filing: 1981-08-17
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Granted: —
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Expires: 2001-08-17
Abstract
Abstract Stretched polyethylene based thermoplastic material and a process for its production. The material has a density between 917 and 935 kg/m<3> and the molecules in the material are essentially linear but contain short aliphatic branches in a number of between 3 and 50 per 1000 carbon atoms. The molecular weight expressed as Mw is between 50,000 and 500,000, the molecular weight distribution, Mw/Mn, is below 10 and the molecule orientation corresponds to a degree of stretching of at least 3, relative to the same material in unoriented form. The material gives a product with improved clarity, improved strength, elasticity and tenacity, as well as less tendency to fibrillation, in the direction transverse to the stretch direction.
Inventors
- 👤 Stefan Ohlsson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 18:45
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/04; C; C08; C08J; C08J5/00; C08J5/18; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
103 words
Stretched plastic material based on polyethylene, characterized in that the density is between 917 and 935 kg/m 3 , the linear chains of the molecules of the material are essentially straight but that there are short aliphatic branches in an average number of between 3 and 50 per 1000 carbon atoms, that the molecular weight, expressed as M , is between 50,000 and 500,000, that the molecular weight distribution, expressed as M w /M n , is below 10 and that the molecules are oriented to a degree corresponding to at least a three times stretching of the same material in unoriented condition.
Claim 2
Dependent Claim
103 words
Stretched plastic material based on polyethylene, characterized in that the density is between 917 and 935 kg/m 3 , the linear chains of the molecules of the material are essentially straight but that there are short aliphatic branches in an average number of between 3 and 50 per 1000 carbon atoms, that the molecular weight, expressed as M , is between 50,000 and 500,000, that the molecular weight distribution, expressed as M w /M n , is below 10 and that the molecules are oriented to a degree corresponding to at least a three times stretching of the same material in unoriented condition.
Claim 3
Dependent Claim
19 words
A material according to claim 1, characterized in that the density is between 920 and 930 kg/m 3 .
Claim 4
Dependent Claim
24 words
A material according to claim 1, characterized in that the content of short branches corresponds to from 5 to 30 per 1000 carbon atoms.
Claim 5
Dependent Claim
21 words
A material according to claim 1, characterized in that the content of short-chained monomers is between 3 and 10 per cent.
Claim 6
Dependent Claim
21 words
A material according to claim 1, characterized in that the molecular weight, expressed as M , is between 90,000 and 300,000.
Claim 7
Dependent Claim
23 words
A material according to claim 1, characterized in that the molecular weight distribution, M w /M n , is between 2 and 4.
Claim 8
Dependent Claim
19 words
A material according to claim 1, characterized in that molecule orientation corresponds to stretching between 4 and 10 times.
Claim 9
Dependent Claim
27 words
A material according to claim 1, characterized in that the content of branches which are longer than 8 carbon atoms is below 0.1 per 1000 carbon atoms.
Claim 10
Dependent Claim
82 words
A process for the production of a material according to claim 1, characterized in that a thermoplastic material based on polyethylene having a density between 917 and 935 kg/m 3 , an essentially linear carbon--chain structure but with short aliphatic branches in a number of between 3 and 50 per 1000 carbon atoms, a molecular weight, expressed as M w , between 50,000 and 500,000 and a molecular weight distribution M w /M n below 10 is stretched at least 3 times.
Claim 11
Dependent Claim
24 words
A process according to claim 9, characterized in that the material, before or during the stretching, is brought into contact with a heated surface.
References Cited (Backward Citations)
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