EP2802703A1 - Réflecteur diffus - Google Patents

Réflecteur diffus

Info

Publication number
EP2802703A1
EP2802703A1 EP13702140.8A EP13702140A EP2802703A1 EP 2802703 A1 EP2802703 A1 EP 2802703A1 EP 13702140 A EP13702140 A EP 13702140A EP 2802703 A1 EP2802703 A1 EP 2802703A1
Authority
EP
European Patent Office
Prior art keywords
reflectance
delamination
nonwoven sheet
sheet
diffuse reflector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13702140.8A
Other languages
German (de)
English (en)
Inventor
Robert Anthony Marin
Jan Van Meerveld
John C. JOHNSTON
D. Craig AMIS
Patrick Henry Young
Jamie W. RUDISILL
Martin Johan Olof WIDENBRANT
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of EP2802703A1 publication Critical patent/EP2802703A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/04—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06N3/045—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds with polyolefin or polystyrene (co-)polymers
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • D04H1/724—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged forming webs during fibre formation, e.g. flash-spinning
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0284—Diffusing elements; Afocal elements characterized by the use used in reflection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
    • Y10T442/2582—Coating or impregnation contains an optical bleach or brightener or functions as an optical bleach or brightener [e.g., it masks fabric yellowing, etc.]

Definitions

  • the present invention relates to a diffuse reflector comprising a nonwoven sheet for use in products such as televisions and lighting requiring high reflectance while resisting sheet delamination.
  • Nonwoven sheets with high reflectance can be used in light reflective end uses. Nonwoven sheets must be bonded for structural integrity and to prevent delamination. However, the bonding process lowers the reflectance. Coatings can be applied to the bonded nonwoven to increase the reflectance.
  • the present invention relates to a diffuse reflector comprising a nonwoven sheet of fibers wherein in the nonwoven sheet has no optical brightener coating, has a basis weight of from about 30 grams per square meter (gsm) to about 100 gsm and has a reflectance and a delamination selected from the group consisting of a reflectance of at least about 97.0% and a delamination of at least about 0.18 N/cm, a reflectance of at least about 96.0% and a delamination of at least about 0.49 N/cm, and a reflectance of at least about 95.0% and a delamination of at least about 0.70 N/cm.
  • gsm grams per square meter
  • nonwoven or “web” as used herein means a structure of individual fibers or threads that are positioned in a random manner to form a planar material without an identifiable pattern, as in a knitted fabric.
  • plexifilamentary fibers as used herein means a three-dimensional integral network or web of a multitude of thin, ribbon-like, film-fibril elements of random length and with a mean film thickness of less than about 4 micrometers and a median fibril width of less than about 25 micrometers.
  • the average film-fibril cross sectional area if mathematically converted to a circular area would yield an effective diameter between about 1 micrometer and 25 micrometers.
  • the film-fibril elements intermittently unite and separate at irregular intervals in various places throughout the length, width and thickness of the structure to form a continuous three-dimensional network.
  • polymer as used herein, generally includes but is not limited to, homopolymers, copolymers (such as for example, block, graft, random and
  • polymer shall include all possible geometrical configurations of the material. These configurations include, but are not limited to isotactic, syndiotactic, and random symmetries.
  • polyolefin as used herein, is intended to mean any of a series of largely saturated polymeric hydrocarbons composed only of carbon and hydrogen.
  • Typical polyolefins include, but are not limited to, polyethylene, polypropylene, polymethylpentene, and various combinations of the monomers ethylene, propylene, and methylpentene.
  • polyethylene as used herein is intended to encompass not only homopolymers of ethylene, but also copolymers wherein at least 85% of the recurring units are ethylene units such as copolymers of ethylene and alpha-olefins.
  • Preferred polyethylenes include low-density polyethylene, linear low-density polyethylene, and linear high-density polyethylene.
  • a preferred linear high-density polyethylene has an upper limit melting range of about 130°C to 140°C, a density in the range of about 0.941 to 0.980 gram per cubic centimeter, and a melt index (as defined by ASTM D-1238-57T Condition E) of between 0.1 and 100, and preferably less than 4.
  • the present invention is directed to a diffuse reflector comprising a nonwoven sheet of fibers wherein in the nonwoven sheet has a combination of high reflectance and good delamination resistance.
  • the diffuse reflector of the present invention can be made by flash spinning a plexifilamentary fiber and the resulting nonwoven sheet generally by using the disclosures in U.S Patent Nos. 3,081 ,519 to Blades et al., 3,227,794 to Anderson et al. and 3,860,369 to Brethauer et al.
  • the flash spinning process produces a flash spun nonwoven sheet of plexifilamentary fibers.
  • flash spinning at low spinning temperatures produces plexifilamentary fibers with unexpectedly high surface area and the resulting bonded nonwoven sheet has high reflectance with good delamination resistance.
  • a method of forming a flash spun plexifilamentary fiber comprising providing a solution of 12% to 24%, by weight of the solution, of polyethylene and a spin agent consisting of a mixture of 68 weight percent normal pentane and 32 weight percent cyclopentane; or 75 weight percent normal pentane and 25 weight percent cyclopentane and flash spinning the solution at a spinning temperature from about 165°C to about 175°C to form the flash spun plexifilamentary fiber.
  • the flash spun plexifilamentary fiber can be made with any suitable
  • a useful polymer is a polyolefin polymer, preferably polyethylene.
  • the nonwoven sheet was made by collecting the flash spun plexifilamentary fibers to form a sheet followed by bonding.
  • the nonwoven sheet has a reflectance and a delamination selected from the group consisting of: a reflectance of at least about 97.0% and a delamination of at least about 0.18 N/cm, a reflectance of at least about 96% and a delamination of at least about 0.49 N/cm, and a reflectance of at least about 95.0% and a delamination of at least about 0.70 N/cm. It is preferred no to have an optical brightener, however a coating with an optical brightener may be added to the nonwoven sheet to improve the reflectance. For example, titanium dioxide with a binder can be coated onto the nonwoven sheet.
  • the nonwoven sheet of the present invention has a preferred basis weight of from about 30 gsm to about 100 gsm. An increase in basis weight can give rise to an increase in reflectance. TEST METHODS
  • ASTM refers to the American Society of Testing Materials.
  • Reflectance was obtained from single nonwoven sheets.
  • a Model SP64 meter available from X-Rite, Incorporated, 4300 44 th St SE, Grand Rapids, Michigan, 49512, USA is placed on the sample and the reading is obtained.
  • the output is a percent reflectance at a wavelength of 550 nm.
  • Delamination Strength of a sheet sample is measured using a constant rate of extension tensile testing machine such as an Instron table model tester.
  • a 2.54 cm by 20.32 cm sample is cut such that its long direction is parallel to the machine direction and is delaminated approximately 3.18 cm by inserting a pick into the cross-section of the sample to initiate a separation and delamination by hand.
  • the delaminated sample faces are mounted in the clamps of the tester which are set 2.54 cm apart.
  • the tester is started and run at a cross-head speed of 5.08 cm/min.
  • the computer starts picking up force readings after the slack is removed in about 1 .3 cm of crosshead travel.
  • the sample is delaminated for about 14 cm during which force readings are taken and averaged.
  • the average delamination strength is the average force divided by the sample width and is expressed in units of N/cm.
  • the test generally follows the method of ASTM D 2724.
  • Basis Weight was determined according to ASTM D-3776 and reported in gsm.
  • Example 1 represents a process for making a plexifilamentary fiber and resulting nonwoven sheet of the present invention.
  • Plexifilamentary fibers and resulting nonwoven sheet were made from flash spinning technology as generally disclosed in U.S Patent Nos. 3,081 ,519 to Blades et al., 3,227,794 to Anderson et al. and 3,860,369 to Brethauer et al.
  • Plexifilamentary fibers were flash spun from a 19 weight percent concentration of high density polyethylene having a melt index of 0.7 g/10 min (measured according to ASTM D-1238 at 190°C and 2.16 kg load) and 3.5% ⁇ 2 in a spin agent of 68 weight percent normal pentane and 32 weight percent cyclopentane at a solution temperature of 175°C.
  • a nonwoven sheet was made by collecting the plexifilamentary fibers into a sheet and whole surface bonding the sheet between two pre-heated rolls at 132.2°C, two pairs of bond rolls at
  • the nonwoven sheet (basis weight, 90.2 gsm) had a reflectance of 97.2% and a delamination of 0.49 N/cm.
  • Example 2 was made the same as Example 1 , except the nonwoven sheet was made by collecting the plexifilamentary fibers into a sheet and whole surface bonding the sheet between two pre-heated rolls at 126.7°C and 121 .1 C, two pairs of bond rolls at 133.3°C and 137.8 C, one roll for each side of the sheet, with backup rolls made by formulated rubber that meets Shore A durometer of 85-90, (with 34.5 bar hydraulic pressure) and two chill rolls to form the bonded nonwoven sheet.
  • the nonwoven sheet (basis weight, 89.2 gsm) had a reflectance of 97.1 % and a delamination of 0.30 N/cm.
  • Example 3 was made the same as Example 1 , except the plexifilamentary fibers were flash spun from a 19 weight percent concentration of high density polyethylene having a melt index of 0.7 g/10 min (measured according to ASTM D- 1238 at 190°C and 2.16 kg load) and 5.0% TiO2 in a spin agent of 75 weight percent normal pentane and 25 weight percent cyclopentane at a solution temperature of 175°C.
  • a nonwoven sheet was made by collecting the plexifilamentary fibers into a sheet and whole surface bonding the sheet between two pre-heated rolls at 126.7°C and 132.2C, two pairs of bond rolls at 142.2°C and 137.8 C, one roll for each side of the sheet, with backup rolls made by formulated rubber that meets Shore A durometer of 85-90, (with 34.5 bar hydraulic pressure) and two chill rolls to form the bonded nonwoven sheet.
  • the nonwoven sheet (basis weight, 1 19.4 gsm) had a reflectance of 97.2% and a delamination of 0.32 N/cm.

Abstract

L'invention concerne un réflecteur diffus d'une feuille non tissée de fibres dans lequel, dans la feuille non tissée, la réflectance et la délamination sont choisies dans le groupe consistant en : une réflectance d'au moins environ 97,0 % et une délamination d'au moins environ 1.80.18 N/cmkg/m, une réflectance d'au moins environ 96,0 % et une délamination d'au moins environ 5.00.49 N/cmkg/m, et une réflectance d'au moins environ 95,0 % et une délamination d'au moins environ 7.10.70 N/cmkg/m.
EP13702140.8A 2012-01-12 2013-01-14 Réflecteur diffus Withdrawn EP2802703A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201261585858P 2012-01-12 2012-01-12
PCT/US2013/021498 WO2013106865A1 (fr) 2012-01-12 2013-01-14 Réflecteur diffus

Publications (1)

Publication Number Publication Date
EP2802703A1 true EP2802703A1 (fr) 2014-11-19

Family

ID=47630554

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13702140.8A Withdrawn EP2802703A1 (fr) 2012-01-12 2013-01-14 Réflecteur diffus

Country Status (5)

Country Link
US (1) US20130183510A1 (fr)
EP (1) EP2802703A1 (fr)
KR (1) KR20140109492A (fr)
CN (1) CN104040058A (fr)
WO (1) WO2013106865A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114687068B (zh) * 2020-12-30 2023-05-23 江苏青昀新材料有限公司 改进型闪蒸无纺布

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3081519A (en) 1962-01-31 1963-03-19 Fibrillated strand
NL300881A (fr) 1962-11-23
US3860369A (en) 1972-11-02 1975-01-14 Du Pont Apparatus for making non-woven fibrous sheet
KR910005573B1 (ko) * 1986-10-13 1991-07-31 아사히 가세이 고오교 가부시끼가이샤 고밀도 폴리에틸렌 망상섬유, 이 섬유로 구성된 부직포 및 이들의 제조방법
DE19710032B4 (de) * 1997-03-12 2004-01-29 Carl Freudenberg Kg Textiles Flächenmaterial für Reinigungszwecke
KR20030065784A (ko) * 2002-02-01 2003-08-09 하종언 반발성이 우수한 부직포
US20040248492A1 (en) * 2003-06-06 2004-12-09 Reemay, Inc. Nonwoven fabric printing medium and method of production
ATE520524T1 (de) * 2003-11-19 2011-09-15 Polymer Group Inc Dreidimensionaler vliesstoff mit verbesserter bauschigkeit und elastizität
US7660040B2 (en) * 2005-05-17 2010-02-09 E. I. Du Pont De Nemours And Company Diffuse reflective article
US20080080055A1 (en) * 2006-09-29 2008-04-03 Edwin James Lightfoot Diffuse reflector comprising nonwoven sheet with binder layer comprising binder and scatterer of visible light
JP2010513986A (ja) * 2006-12-18 2010-04-30 イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー 拡散反射体、拡散反射物品、光学ディスプレイ、および拡散反射体の製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2013106865A1 *

Also Published As

Publication number Publication date
US20130183510A1 (en) 2013-07-18
KR20140109492A (ko) 2014-09-15
WO2013106865A1 (fr) 2013-07-18
CN104040058A (zh) 2014-09-10

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Inventor name: MEERVELD, JAN VAN

Inventor name: RUDISILL, JAMIE W.

Inventor name: WIDENBRANT, MARTIN JOHAN OLOF

Inventor name: AMIS, D. CRAIG

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Inventor name: JOHNSTON, JOHN C.

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