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Dimensionally stable nonwoven fibrous webs and methods of making and using the same

A web and fiber technology, applied in the field of non-woven fiber webs, can solve the problems that non-woven webs cannot be made into the same fiber diameter, high melt viscosity, limited applications, etc., and achieve superior tensile strength and low production Effects of cost, high production rate

Inactive Publication Date: 2012-05-02
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, difficulties are often encountered when using aliphatic polyesters such as polylactic acid for BMF due to the relatively high melt viscosity of aliphatic polyester thermoplastics, which produces nonwoven webs that typically cannot be compared to polypropylene that are made to the same fiber diameter
The coarse fiber diameter of polyester webs can limit their applications since the properties of many end products are governed by fiber diameter
Coarse fibers, for example, can appear stiff and have a poor feel when used in skin contact applications

Method used

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  • Dimensionally stable nonwoven fibrous webs and methods of making and using the same
  • Dimensionally stable nonwoven fibrous webs and methods of making and using the same
  • Dimensionally stable nonwoven fibrous webs and methods of making and using the same

Examples

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Effect test

example 1

[0239] Example 1: Spunbond PLA using polypropylene .

[0240] Nonwoven webs were produced from pure polylactic acid (PLA) and blends of PLA and polypropylene (PP) using a spunbond process. The PLA used was grade 6202D from Natureworks, LLC (Minnetonka, MN). The PP used was grade 3860X from Total Petrochemicals (Houston, TX). One sample also contained a 50 / 50 mixture of dioctyl sulfosuccinate sodium salt (DOSS) and polyethylene glycol (PEG) as plasticizer, diluent and hydrophilic surfactant. The DOSS / PEG blend was compounded with 6202D PLA and added to the spunbond process as a masterbatch.

[0241] The spunbond equipment used was that described in US Patent No. 6,196,752 (Berrigan et al.). The extruder used was a 2 inch single screw extruder from Davis-Standard (Pawcatuck, CT). The die used had an effective width of 7.875 inches and was fed polymer melt from a metering pump at a rate of 42 pounds per hour. The die had 648 holes, each hole was 0.040 inches in diameter, w...

example 2

[0246] Example 2: Meltblown PLA using polypropylene

[0247] Nonwoven webs were made from polylactic acid (PLA) and polypropylene (PP) using a melt blowing process. The PLA used was grade 625 ID from Natureworks, LLC (Minnetonka, MN). The PP used was grade 3960 from Total Petrochemicals (Houston, TX).

[0248] The melt-blown device consists of a twin-screw extruder, a metering pump, and a melt-blown die. The extruder used was a 31 mm conical twin-screw extruder (C.W. Brabender Instruments (South Hackensack, NJ)). After the extruder, a positive displacement gear pump is used to meter and pressurize the polymer melt. The metered melt is sent to the drilled orifice melt blown die. Drilled orifice meltblowing dies are described in US Patent No. 3,825,380. The die used was 10 inches wide with 20 polymer orifices per inch of width, each orifice 0.015 inches in diameter. The die was run at a temperature of 225°C. Different mixtures of polymer pellets were fed into the proces...

example 3

[0252] Example 3: Meltblown PLA Utilizing Viscosity Adjusting Salt

[0253] Nonwoven webs are manufactured using the meltblown process using PLA and various salts that cause the apparent viscosity of the melt to drop significantly during processing. The fiber diameter of the finished nonwoven web was also smaller when salt was added. Polypropylene was also added to some mixtures to reduce shrinkage of the nonwoven web. The resulting web has properties of reduced fiber diameter and reduced shrinkage. The polypropylene used was grade 3960 from Total Petrochemicals (Houston, TX). The PLA used was grade 625 ID from Natureworks, LLC (Minnetonka, MN). Additives tested included:

[0254] Calcium stearoyl lactylate (CSL) (trade name: Patationic CSL from RITA Corp. (Crystal Lake, IL));

[0255] Sodium stearoyl lactylate (SSL) (trade name: Patationic SSL from RITA Corp. (Crystal Lake, IL));

[0256] Calcium stearate (Ca-S) from Aldrich (St. Louis, MO);

[0257] Sodium behenyl l...

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Abstract

Dimensionally stable nonwoven fibrous webs include a multiplicity of continuous fibers formed from one or more thermoplastic polyesters and polypropylene in an amount greater than 0% and no more than 10% by weight of the web. The webs have at least one dimension which decreases by no greater than 10% in the plane of the web when heated to a temperature above a glass transition temperature of the fibers. When the thermoplastic polyester is selected to include aliphatic and aromatic polyesters, a spunbond process may be used to produce substantially continuous fibers that exhibit molecular orientation. When the thermoplastic polyester is selected from aliphatic polyesters, a meltblown process may be used to produce discontinuous fibers that do not exhibit molecular orientation.; The webs may be used as articles for filtration, sound absorption, thermal insulation, surface cleaning, cellular growth support, drug delivery, personal hygiene, medical apparel, or wound dressing.

Description

[0001] Cross references to related patent applications [0002] This patent application claims priority to U.S. Provisional Patent Application No. 61 / 165,316, filed March 31, 2009, and U.S. Provisional Patent Application No. 61 / 186,374, filed June 11, 2009, both of which are The disclosure is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to dimensionally stable nonwoven fibrous webs and methods of making and using such webs. The present invention also relates to a dimensionally stable nonwoven fibrous web comprising a copolymer of polypropylene and aliphatic and / or aromatic polyester useful for the manufacture of articles such as biodegradable and biocompatible articles. mixture. Background technique [0004] The melt spinning process (or spunbond process) is a process in which molten polymer is extruded through small orifices in a die, the spun filaments are collected in a uniform random manner on a web, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H3/007D04H3/011D04H3/14A61L15/26A61L15/24A61L15/42A61L15/44A61L15/48D04H1/544D04H1/55
CPCD01F6/92D04H3/011D01F1/10D04H1/544D04H1/55D04H1/435D04H1/4291
Inventor 埃里克·M·摩尔约翰·D·施泰尔特迈克尔·R·贝里甘弗朗西斯·E·波尔贝尼马修·T·斯科尔茨凯文·D·兰格雷布西安·F·芬尼西杰伊·M·杰嫩
Owner 3M INNOVATIVE PROPERTIES CO
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