Melt-blown nonwoven fabric, process for producing same and the uses thereof
First Claim
1. A melt-blown formed fabric based on cellulose acetate having a degree of polymerization between about 150 to 400, said formed fabric having fibers with a mean fiber diameter in the range of about 2 to 8 μ
- m, a retained softening agent following extraction of nearly 0 to 10% of the weight of formed fabric, a reflection factor (R∞
), determined according to DIN 53 145 Part I (1992), of more than approximately 60%, and a degree of substitution of approximately 1.7 to 2.7.
1 Assignment
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Accused Products
Abstract
The disclosure relates to a melt-blown non-woven fabric based on cellulose esters, with fibers of mean diameter less than about 10 microns. The fabric contains 0-10 wt. % extractable softener, has a reflection factor determined according to DIN 53 145 Part I (1992) of more than 60% and the cellulose ester has a degree of substitution DS of about 1.5-3.0. The softener is preferably water-extractable. A melt-blown non-woven fabric is produced with the cellulose ester as follows: a cellulose ester, cellulose acetate, with a DS of about 1.5-3.0, in particular 1.7-2.7, is mixed with softener in a weight ratio of about 2:1 to 1:4 and simultaneously heated and melted. The mixture of softener and cellulose ester has a melting index MFI (210/2.16) according to DIN 53 735 of about 400 to 5 g/10 min., in particular 300 to 50 g/10 min. The melt is worked in a melt-blown spinning device into a melt-blown non-woven fabric and the softener is then extracted with a softener solvent to leave a proportion of 0-10 wt. %. The melt-blown non-woven fabric is especially suitable as a filter material.
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Citations
27 Claims
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1. A melt-blown formed fabric based on cellulose acetate having a degree of polymerization between about 150 to 400, said formed fabric having fibers with a mean fiber diameter in the range of about 2 to 8 μ
- m, a retained softening agent following extraction of nearly 0 to 10% of the weight of formed fabric, a reflection factor (R∞
), determined according to DIN 53 145 Part I (1992), of more than approximately 60%, and a degree of substitution of approximately 1.7 to 2.7. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
- m, a retained softening agent following extraction of nearly 0 to 10% of the weight of formed fabric, a reflection factor (R∞
Specification