CN103182819B - Comprise the diffuse reflector compound of nonwoven sheet - Google Patents

Comprise the diffuse reflector compound of nonwoven sheet Download PDF

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Publication number
CN103182819B
CN103182819B CN201110460223.2A CN201110460223A CN103182819B CN 103182819 B CN103182819 B CN 103182819B CN 201110460223 A CN201110460223 A CN 201110460223A CN 103182819 B CN103182819 B CN 103182819B
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CN
China
Prior art keywords
diffuse reflector
film
pet film
reflector compound
compound
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Expired - Fee Related
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CN201110460223.2A
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Chinese (zh)
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CN103182819A (en
Inventor
戴炜枫
周作成
吴秋菊
胥波
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EIDP Inc
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EI Du Pont de Nemours and Co
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Priority to CN201110460223.2A priority Critical patent/CN103182819B/en
Priority to PCT/US2012/071148 priority patent/WO2013101703A1/en
Publication of CN103182819A publication Critical patent/CN103182819A/en
Application granted granted Critical
Publication of CN103182819B publication Critical patent/CN103182819B/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/0074—Production of other optical elements not provided for in B29D11/00009- B29D11/0073
    • B29D11/00798—Producing diffusers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0276—Polyester fibres
    • B32B2262/0284—Polyethylene terephthalate [PET] or polybutylene terephthalate [PBT]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/406—Bright, glossy, shiny surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2551/00—Optical elements

Abstract

The present invention relates to diffuse reflector compound, it comprises (a) non-woven HDPE sheet material, and (b) polyethylene terephthalate film, and (c) polyethylene film, wherein said polyethylene film (c) is towards display floater.These diffuse reflector compounds can be applicable to light processing example in optical display as the back lighting device in the liquid crystal display of notebook computer and TV.

Description

Comprise the diffuse reflector compound of nonwoven sheet
Technical field
The present invention relates to the diffuse reflector compound comprising non-woven high density polyethylene (HDPE) sheet material.Described diffuse reflector compound can reverberation equably, can be used in the optical display of the back lighting device (BLU) in the liquid crystal display of such as notebook computer and TV and so on.
Background technology
Brightness (image intensity) is the key performance of the straight watching display (such as instrument panel, portable computer screen, liquid crystal display (LCD)) for electronic equipment.
In order to improve the brightness of display, a kind of method is the quantity or the power that increase light source.But the method is limited to the problem of higher power consumption and weight increase.Another kind method be utilize reflector plate make image conformity and brightness maximum.The optical cavity that reflector plate is placed in optical display is interior in order to the light from light source is reflected to display floater.According to the position of light source relative to display floater, there is side as shown in Figure 1 illuminated back lighting device, or back-illuminated type back lighting device as shown in Figure 2.
Reflectivity is crucial especially in the equipment of battery-powered, and wherein the improvement of reflectivity is directly connected to the minimizing of required light source, and reduces electrical energy demands thus.U.S. Patent application 2007/0048499 discloses according to reality test, and when the reflectivity of BLU module increases 3%-5%, the brightness of this module increases 8%-10%.
There is the multiple commercially available white reflective sheet based on plastics.Such as, filling TiO 2 (TiO 2) or barium sulfate then by biaxial stretching with formed micropore strengthen its light reflection PET film be known reflector plate material, such as can from TorayPlasticsInc. (U.S.), (NorthKingstown, R.I.) obtains film E6SR.Another kind of known reflector plate material is the foamed polymer sheet with reflectivity micropore, the reflectivity microporous foam polyester sheet MC-PET that such as can obtain from FurukawaElectricCo.Ltd. (Tokyo).Another kind of known reflector plate material is the highly reflecting films of the entanglement fibril containing hole by expanded PTFE (ePTFE) obtained energy reverberation, such as can from W.L.Gore & Associates, Inc. (Newark, Del.) highly reflecting films of obtaining.
Recently, what receive much attention is use supatex fabric (also known as non-woven fabrics) as backlight reflection sheet, because the high reflectance of itself and cost efficiency.When for LCD back lighting device or illuminating equipment, it provides high light-shading effect, high diffuse reflectance (> 90%) and high brightness to compensate.
United States Patent (USP) 7,660, the 040 Diffuse Light Reflectance sheet first disclosing the non-woven polymer sheet material comprised containing fiber and interfiber pore, wherein said polymer is polyolefin and other kind of polymer.More specifically, in an embodiment, the sudden strain of a muscle comprising multiple high density polyethylene (HDPE) (HDPE) clump silk (plexifilamentary) film-fibril is used to spin single-layer nonwoven sheet material or the multi-layer nonwoven sheet material of HDPE.This Diffuse Light Reflectance sheet can be applicable in the back lighting device of back-illuminated type and side illuminated optical display.
Recently, U.S. Patent application 2010/0238665 also discloses Diffuse Light Reflectance sheet, its polymeric layer comprising reflective nonwoven sheet and be made up of polyolefin, polyester, polyacrylate and composition thereof.These Diffuse Light Reflectance sheets can be applicable to the illuminating equipment be made up of coil or aluminium, such as, and office's fluorescent lamp or ordinary lamp and lantern.This Diffuse Light Reflectance sheet has excellent reflectivity (at 550nm, reflectivity is about 94%-about 97%) and is less than the glossiness of 10%.But, their rigidity and heat endurance not ideal enough, which has limited their further application, such as, the application in LCD back lighting device.
The improvement diffusive reflective plate needing to have high reflectance (> 94%), good heat endurance and enough deflections is used in visible-light treatment application, with production prices more rationally and the higher optical display of energy efficiency.
Summary of the invention
The invention provides the diffuse reflector compound that heat endurance is high, it comprises:
A () non-woven high density polyethylene (HDPE) sheet material, its thickness is about 100-400 μm, and its basic weight is about 30-210g/m 2;
(b) PET (PET) film, it contains the filler particles (A) of 0-50 % by weight, and its thickness is about 25-150 μm; With
(c) polyethylene (PE) film, it contains the filler particles (B) of 0-30 % by weight, and its thickness is about 10-100 μm;
Wherein
Described diffuse reflector compound has (a)/(b)/(c) structure;
PE film (c) of described diffuse reflector compound is towards display floater, and its surface pressure is printed on the pattern that the degree of depth is 1 μm-10 μm, and described pattern is random or orderly;
Described filler particles (A) and (B) are independently selected from titanium dioxide (TiO 2), barium sulfate (BaSO 4), polymethyl methacrylate (PMMA) and composition thereof; And
Described diffuse reflector compound have according to ASTME1349-06 measure be at least at 550nm about 94% light reflectivity, and have according to ASTMD523 measure be less than 10% glossiness.
In one embodiment, in diffuse reflector compound of the present invention, described non-woven HDPE sheet material (a) and described PET film (b) are bonded by the first adhesive, and described PET film (b) and PE film (c) are bonded by the second adhesive.
In another embodiment, diffuse reflector compound of the present invention also comprises (d) second PET (PET) film, it contains 0-30 % by weight filler particles (C) and its thickness is about 25-150 μm, wherein said diffuse reflector compound has (d)/(a)/(b)/(c) structure, described second PET film (d) is bonded on the side of described non-woven HDPE sheet material (a) by the 3rd adhesive, this side is the opposition side with the first PET film (b) place, and described filler particles (C) is selected from TiO 2, BaSO 4, PMMA and composition thereof.
In still another embodiment, in diffuse reflector compound of the present invention, described first, second, and third adhesive is independently selected from polyurethane, polyacrylate, polyepoxide and composition thereof.
In one embodiment, in diffuse reflector compound of the present invention, what described first, second, and third adhesive comprised 0%-30% is selected from TiO independently of one another 2, BaSO 4, PMMA and composition thereof filler particles (D), wherein said filler particles (D) and filler particles (A), (B) or (C) are identical or different.
The present invention goes back the diffuse goods of providing package containing diffuse reflector compound of the present invention.
The present invention also provides optical display, and it comprises:
I () defines the structure of optical cavity;
(ii) light source of described optical cavity is positioned at;
(iii) from described light source light through display floater; With
(iv) diffusive reflective plate of diffuse reflector compound of the present invention is comprised;
Wherein said diffusive reflective plate be positioned at described optical cavity in order to by the light from light source from the surface reflection of described diffusive reflective plate towards described display floater.
The present invention is also provided for improving the method for the light reflectivity needing light diffuse device, and it comprises:
Providing package is containing the diffusive reflective plate of diffuse reflector compound of the present invention; With
Described diffusive reflective plate is placed in described device to make light be reflected from the surface of described diffusive reflective plate.
With reference to following explanation, embodiment and following claims, various further feature of the present invention, aspect and advantage will become more obvious.
Accompanying drawing explanation
Fig. 1 is the transversal schematic diagram of an embodiment of optical display of the present invention, and it has side illuminated back lighting device.
Fig. 2 is the transversal schematic diagram of another embodiment of optical display of the present invention, and it has back-illuminated type back lighting device.
Fig. 3 is the schematic diagram being applicable to the method preparing diffuse reflector compound of the present invention.
Detailed description of the invention
Except as otherwise noted, all publications mentioned herein, patent application, patent and other bibliography are incorporated into herein all by reference in full, are equivalent to be presented in herein in full.
Unless otherwise defined, all technology used herein and scientific terminology have the same implication usually understood with those skilled in the art of the invention.In case of conflict, be as the criterion with the definition of this description.
Unless otherwise indicated, all percentage, number, ratio etc. are all by weight.
Term used herein " by ... make " and " comprising " synonym.Term used herein " comprises ", " comprising ", " containing ", " having " " have " or its other variant any, is intended to contain nonexcludability and comprises.Such as, comprise that the composition of a series of key element, technique, method, goods or device are unnecessary is only limitted to those key elements, but other key element clearly do not enumerated can be comprised, or other key element that these compositions, technique, method, goods or device are intrinsic.
Conjunction " by ... composition " do not comprise any unspecified key element, step or composition.If in the claims, this type of term means described claim and does not comprise material except cited those, but comprises usual relative impurity.When term " by ... composition " appears in the subordinate clause of claim main body, instead of follow preamble closely, then it only limits the key element enumerated in this subordinate clause; Other key element is not then excluded outside described claim as a whole.
Conjunction " substantially by ... composition " be used for defining composition, method or device; it is except comprising literal described those; also comprise other material, step, feature, component or key element, to be these other material, step, feature, component or key elements do not produce substantial impact on the basic of the invention of request protection with the feature of novelty to condition.Term " substantially by ... the composition " scope that contains between " comprising " and " by ... form " between.
Conjunction " substantially do not comprise/draw together " or " being substantially devoid of " certain/a little component refers to that composition of the present invention, relative to the gross weight of described composition, should comprise lower than 1 % by weight, is preferably lower than the described component of 0.1 % by weight.
Term " comprise/draw together " intention comprise by term " substantially by ... composition " and " by ... form " embodiment that contains.Similarly, term " substantially by ... composition " intention comprises term " by ... the composition " embodiment that contains.
When content, concentration or other numerical value or parameter provide with the form of scope, preferable range or a series of larger preferred value and less preferred value, this is interpreted as, specifically disclose all codomains formed by any logarithm value (being made up of with any lower limit or less preferred value any upper limit or larger preferred value), no matter whether scope is open separately.Such as, when stating codomain " 1 to 5 ", described scope is understood to include scope " 1 to 4 ", " 1 to 3 ", " 1-2 ", " 1-2 & 4-5 ", " 1-3 & 5 " etc.Unless otherwise indicated, state number range part herein, described scope is intended to comprise its endpoint value, and all integers within the scope of this and mark.
When term " about " is for describing the endpoint value of numerical value or scope, the disclosure is understood to include the occurrence of indication or involved endpoint value.
In addition, unless state otherwise clearly, " or (or) " refers to " or (or) " of inclusive, and non-exclusive " or (or) ".Such as, the following any one A "or" B:A that satisfies condition is true (or existence) and B is false (or not existing), A is false (or not existing) and B is true (or existence), and A and B is very (or existence).
In addition, before key element of the present invention or composition " once " and " one " example (namely existing) quantity of meaning described key element or composition be nonrestrictive.Therefore " one " or " one " are understood to include one or at least one, and the singulative of described key element or composition also comprises its plural number, unless its quantity should be odd number significantly.
In description of the present invention and/or claims, term " homopolymers " refers to the polymer obtained by a kind of monomer polymerization; " copolymer " refers to the polymer obtained by two or more monomer polymerizations.This analog copolymer comprises bipolymer, terpolymer or multiple copolymer.
When describing some polymer, applicant sometimes should be understood and represent polymer by the quantity of the monomer for the preparation of polymer or the monomer for the preparation of polymer.And this description may not comprise the concrete name for describing final polymer, or the restriction that " product obtained by ... method " is such may not be comprised, the statement of this type of monomer any and amount should be interpreted as meaning the described monomer that described polymer comprises those monomers (copolymerization units of such as those monomers) or described amount, and its corresponding polymer and composition.
Term used herein " light " refers to the electromagnetic radiation of the visible light part of spectrum medium wavelength 400nm-780nm.Except as otherwise noted, " the photopic vision reflectivity " of light refers to the viewed reflectivity of observer (e.g., diffusion and specular reflectivity) in the visible wavelength range of 400nm-780nm herein.Use D65 lamp and " Billmeyer and SaltzmanPrinciplesofColorTechnology ", the CIEstandardphotopicobserver described in the 3rd edition, calculate photopic vision reflectivity by total reflected light modal data.
The embodiment of the present invention described in summary of the invention part comprise other embodiment any as herein described, all embodiments can combine by any way, and the variable description in embodiment is not only applicable to diffuse reflector compound of the present invention, and is applicable to diffuse goods of the present invention and comprises the optical display of diffuse reflector compound of the present invention.
Below in detail the present invention is described in detail.
(a) non-woven HDPE sheet material
Non-woven HDPE sheet material (a) that can be contained in diffuse reflector compound of the present invention spins the obtained clump cortina-fibril sheet of high density polyethylene (HDPE) by dodging.
The three-dimensional of thin, belt type film-fibril that a large amount of length that refers to term used herein " clump silk (plexifilamentary) " differs integrates net, and average fibril thickness is less than about 4 μm and intermediate value width is less than about 25 μm.In clump silk structure, film-fibril normally aligns with prolonging with the longitudinal axis of this structure, and they combine off and on each position that irregular is interposed between length, width and the thickness running through this structure and separate to form the three-dimensional netted thing of continuous print.This class formation at United States Patent (USP) 3,081,519 and United States Patent (USP) 3,227, have further detailed description in 794.
Slightly the sudden strain of a muscle of compacting spin HDPE nonwoven sheet can according to the common processes of the United States Patent (USP) 3,169,899 of Steuber obtain.High density polyethylene (HDPE) is spun by polyethylene solution sudden strain of a muscle in a solvent and obtains.This solution is pumped to spinneret assembly continuously.This solution by the mode of each spinneret assembly is: through first jet arrive pressure reduce district, and after enter in atmospheric environment through second nozzle.Utilize setting rotating barrier to make the film of gained-fibril bundle sprawl and vibrate, make its load electrostatic, then deposit on the moving belt.Spinning head is separated bring the deposit providing overlap to intersect to form wide felt, then by its compacting a little at this.
The thickness of non-woven HDPE sheet material (a) be applicable to is about 100-400 μm, or about 120-300 μm.The basic weight of non-woven HDPE sheet material (a) be applicable to is about 30-210g/m 2, or about 40-160g/m 2, or about 50-110g/m 2.
Described non-woven HDPE sheet material (a) can be called spy from E.I.Du Pont Company's trade mark and defend by force commercially available dissimilar product, preferably " 10 type " kind, it has the sheet structure of smooth, stiffening, similar paper.
(b) PET film
Multi-layer polymer film can be put on non-woven HDPE sheet material (a) to increase its opacity and reflectivity.Compared with single thick-layer, the diffuse reflector compound of multiple thin layer gained also has higher heat endurance.
In order to increase opacity and reflectivity, usually extra polymeric layer is put on the side towards light source of described non-woven HDPE sheet material (a).The thickness of the PET film (b) be applicable to is about 25-150 μm, or about 50-120 μm.
PET (PET) film is known has good reflectivity and be easy to obtain for white.Applicable PET film of the present invention be comprise 0-50 % by weight be selected from TiO 2, BaSO 4, PMMA and composition thereof the PET film of filler particles (A).Preferably, described filler particles (A) is selected from TiO 2, BaSO 4and composition thereof.More preferably, described filler particles (A) is TiO 2.
Although the amount of fillers known particle is relevant with reflectivity to the opacity of PET film, when weighing total reflectivity and the gross weight of described diffuse reflector compound, described PET film (b) preferably comprises the filler particles (A) of 3%-30%.
In one embodiment, what the PET film (b) of diffuse reflector compound of the present invention comprised 3%-30% is selected from TiO 2, BaSO 4, PMMA and composition thereof filler particles (A).
In another embodiment, what the PET film (b) of diffuse reflector compound of the present invention comprised 3%-10% is selected from TiO 2, BaSO 4and composition thereof filler particles (A).
In still another embodiment, the PET film (b) of diffuse reflector compound of the present invention comprises the TiO of 3%-10% 2as filler particles (A).
Transparent or the white PET film of various thickness has many suppliers.Such as, Kunshan Jian Tong Electronics Co., Ltd.; Di Ren film Co., Ltd of Du Pont; Foshan dupont Hongji Membrane Co., Ltd; With Foshan multipotency film Co., Ltd.
(c) PE film
PET film is the intrinsic hardness on PET film surface as a problem of the top layer of laminated reflector plate, and it may the careful surface of scraping light guide plate when the temperature of optical cavity raises under running conditions, makes the image conformity of particularly side illuminated BLU reduce thus.
In order to avoid problems, third layer polyethylene (PE) film (c) is put in the PET film (b) in diffuse reflector compound of the present invention.The thickness of PE film (c) be applicable to is about 10-100 μm, or about 30-80 μm, and is selected from low density polyethylene (LDPE) (LDPE), high density polyethylene (HDPE) (HDPE), or its mixture.Preferably, described PE film (c) is obtained by the mixture of LDPE and HDPE.
What described PE film (c) can comprise 0-30 % by weight is selected from TiO 2, BaSO 4, PMMA and composition thereof filler particles (B).
Due to the top layer that described PE film (c) is towards display floater, when its impression has the glossiness that can reduce described diffuse reflector compound during pattern to keep its reflectivity simultaneously.Described glossiness can be less than 10%, comprises and is less than 9%, 8%, 7%, 6% and 5%.
Imprinted pattern on described PE film (c) can be random or orderly, and its degree of depth is about 1-10 μm.The PE film impressed makes diffuse reflector compound of the present invention and does not have higher diffuse reflectance containing figuratum equivalent beds's compound.
There are many suppliers can provide the PE impressed film.Such as, the transparent of the various thickness with argyle design or white PE film (namely containing filler particles (B)) can be buied from Hangzhou Quanxing Plastic Manufacturing Co., Ltd. (China).
(d) support membrane-the second PET film
Find, additional polymeric layer can be put on the side contrary with light source of described non-woven HDPE sheet material (a) to give the extra rigidity of described diffuse reflector compound or structural stability.Therefore, be referred to as herein " support membrane ".When described diffuse reflector compound is used for large scale optical display as LCD TV higher than 32 inches of screens, support membrane is particularly useful.
The polymeric material being suitable as described support membrane is not limited, as long as the thickness of described support membrane is about 25-150 μm, or about 50-120 μm.
Described second PET film (d) can comprise 0-30 % by weight, or the filler particles of 0-10 % by weight (C), and wherein said filler particles (C) is selected from TiO 2, BaSO 4, PMMA and composition thereof.The major function of described second PET film (d) gives diffuse reflector compound deflection of the present invention, described second PET film (d) with regard to composition and thickness the first PET film (b) described in Yan Keyu identical or different.Such as, described second PET film (d) can be that it is more cheap than white PET film not containing the hyaline membrane of any filler particles.
In one embodiment, what the second PET film (d) of diffuse reflector compound of the present invention comprised 0%-10% is selected from TiO 2, BaSO 4, PMMA and composition thereof filler particles (C).
adhesive
In the diffuse reflector compound of three layers or four layers of the present invention, described non-woven HDPE sheet material (a), PET film (b), PE film (c) and optional the second PET film (d) existed are bonded by adhesive and adjacent layer.For the diffuse reflector compound of 3 layers, i.e. (a)/(b)/(c) structure, described non-woven HDPE sheet material (a) and described PET film (b) are bonded by the first adhesive, and described PET film (b) and PE film (c) are bonded by the second adhesive.
For the diffuse reflector compound of 4 layers of the present invention, described second PET film (d) is bonded on the side of described HDPE sheet material (a) by the 3rd adhesive, and this side is the opposition side with described PET film (b) place.
The adhesive be applicable to is when normal operating and use (such as LCD assembling and use), makes described diffuse reflector compound keep those adhesives of enough structural intergrities.Adhesive preferably has the thermal expansivity similar with PE film to described non-woven HDPE sheet material, PET film, thus variations in temperature can not cause described diffuse reflector compound to be separated because of dilatancy difference.
Preferably known adhesive, comprises polyurethane, polyacrylate, polyepoxide and composition thereof.But consider the convenience of preparation, described first, second and/or the 3rd adhesive are preferably identical.
In one embodiment, described first, second and/or the 3rd adhesive are selected from polyurethane, polyacrylate, polyepoxide and composition thereof independently of one another.
What the adhesive be applicable to can comprise 0%-30% is selected from TiO 2, BaSO 4, PMMA and composition thereof filler particles (D), and filler particles (D) can be identical or different with described filler particles (A), (B) or (C).
The instantiation of available adhesive comprises, the palyacrylate binder can buied from Nanjing Jiu Hang Chemical Co., Ltd., and the polyurethane binder can buied from Shanghai Lie Yin Chemical Co., Ltd..
prepare the method for described diffuse reflector compound
Diffuse reflector compound of the present invention can utilize laminator standby by the laminated legal system of dry type.Typically, as shown in Figure 3, in a first step, make the rough surface of PET film (b) both sides to contribute to this film to be bonded to non-woven HDPE sheet material (a) by corona and/or plasma treatment 22.In the second step, PET film (b) is made through the first adhesive glue groove 23 by its surperficial coating adhesive thin layer.Then, in third step, make the PET film (b) being coated with adhesive through drying tunnel 26 evaporating solvent, the surface of the PET film (b) that adhesive is coated with is in micro-sticky and not dry state.Finally, the surface of the PET film (b) be coated with by adhesive by the composite roll 27 in compounding machine is laminated together with non-woven HDPE sheet material (a).The bonding between non-woven HDPE sheet material (a) and PET film (b) is realized, obtained 2 layered laminate with [(a)/first adhesive/(b)] structure by the pressure applying to be applicable to composite roll 27.The step of duplication similarity, the second adhesive is coated with on the surface in the PET film (b) of this 2 layered laminate, after solvent evaporation, the PET film (b) be coated with by adhesive is the laminated diffuse reflector compound obtaining 3 layers of the present invention together with PE film (c), and its structure is: [(a)/first adhesive/(b)/the second adhesive/(c)].If this PE film (c) has impressed pattern, then carry out laminated between the PET film (b) and the smooth surface of PE film (c) impressed of described 2 layered laminate.
When diffuse reflector compound of the present invention also comprises the second PET film (d), then by making the second PET film (d) obtain the diffuse reflector compound of 4 layers by the process of following 4 steps: make rough surface through corona and/or plasma treatment, its surface is coated with the 3rd adhesive, dry adhesive, then laminated together with non-woven HDPE sheet material (a) of the diffuse reflector compound of 3 layers.The structure of the diffuse reflector compound of 4 layers obtained is according to the method described above: [(d)/3rd adhesive/(a)/the first adhesive/(b)/the second adhesive/(c)].
In view of cost and processing facility, described first, second, and third adhesive is preferably identical.Therefore, in order to prepare diffuse reflector compound of the present invention, multiple adhesive glue groove or extra laminator is not needed.
After dry, the theoretic throat of adhesive is preferably about 25 μm fully to bond each layer.Therefore, those skilled in the art correspondingly can adjust concentration, the coating speed (or film is through holdup time of adhesive glue groove) of binder solution for lamination apparatus system, and drying condition.
the feature of diffuse reflector compound
Diffuse reflector compound of the present invention can provide the reflectivity being greater than 94% in the visible wavelength range of 400nm-780nm, effectively can strengthen the brightness of backlight modular unit thus.For the ease of comparing, make comparisons mutually with its reflectivity at 550nm between sample.
" glossiness " is the whether smooth visual character in the surface for evaluating goods (such as diffuse reflector compound).If the reflection of product surface mainly mirror-reflection, then the glossiness of these goods is higher.Reflecting layer of the present invention compound preferably mainly through diffuse reflection reverberation to obtain uniform image.When light source projects with incidence angle 85 °, the glossiness recording described surface according to ASTMD523 standard method is preferably less than 10%.
Diffuse goods of the present invention or optical display comprise the diffuse reflector compound being positioned at the structure defining optical cavity.At this, " optical cavity " refers to that design is used for receiving from the light of light source, adjustment the shell of object of being benefited to illumination by this photoconduction.Optical cavity comprises and is closed by the polishing from light source, alter course and/or focus on structure on the receiver, and can use the medium of element as this chamber of air or high index of refraction.The geometry of this structure does not limit.The example comprising the structure of optical cavity comprises lighting device, duplicator, the photo engine (projectiondisplaylightengines) of projection display system, integrating sphere uniform source system, identification box (signcabinet), photoconductive tube and backlight assembly.
Diffuse goods of the present invention or optical display comprise the light source being positioned at described optical cavity." light source " refers to the emission source of visible ray herein, and can be the single source in optical cavity or the multiple light sources in optical cavity.The example of light source comprises incandescent type, mercury type, metal halide type, low pressure sodium form, high pressure sodium form, arc light type, close-coupled fluorescent type, from the bulb of ballast formula fluorescent type, cold-cathode fluorescence lamp (CCFL), light emitting diode (LED) type and fluorescent tube, and can launch the similar device of visible ray.
Diffuse goods of the present invention or optical display comprise from light source light the display floater of process." display floater " refers to the penetrating apparatus regulated from the transmission amount of the light of light source herein, in certain embodiments, regulates light quantity so that image is conveyed to beholder with the form of visible ray.The structure defining described optical cavity is wherein pass on still image in the embodiment of the lighting device of beholder or identification box system, the example of display floater comprises: it comprises still image (such as, word or pattern image), or there is no polymer or the face glass of image (such as, fluorescence diffusing globe).The structure defining optical cavity be wherein in order to by the image transmitting of static and/or change in the embodiment of the back lighting device of the liquid crystal display of beholder, the example of display floater comprises and has the response signal of telecommunication and the liquid crystal of image that changes.
Diffuse goods of the present invention or optical display comprise the diffuse reflector compound that is positioned at described optical cavity in order to light reflection to be benefited object to illumination.This diffusive reflective plate is positioned at described optical cavity, makes it light of this object that do not lead in optical cavity can be reflected back this object.In a kind of optical display, described diffusive reflective plate is the rear of the light source being positioned at this display floater of illumination.The light scattering of diffusive reflective plate of the present invention and diffuse reflective characteristics provide more fully diffused light, and such as, more fully diffused light source, therefore, provides the optical display more uniformly illuminating or throw light on equably.Fig. 1-2 be the schematic diagram of several embodiments of optical display for adopting diffuse goods of the present invention.
Fig. 1 adopts the transversal schematic diagram comprising the side illuminated liquid crystal optics display of the diffusive reflective plate 10 of reflecting layer of the present invention compound.In FIG, shown optical display 1 has the fluorescence light source 2 coordinated with the optical cavity comprising light guide plate 3.By diffusion disk 4, optional brightness enhancement film 5 (such as United States Patent (USP) 4,906,070 and 5,056, described in 892, and can from MinnesotaMiningandManufacturingCo. (3M), Minneapolis, Minn., the film that the U.S. obtains), and optional reflective polarizers 6 (also can obtain from 3M) described in open WO91/5327 and WO97/32224 of PCT is placed in the upper strata (or above) of light guide plate 3, and be used for the light changed course that makes to launch from light guide plate 3 reflectivity differentiation to display panels 7 and final observer.Display panels 7 is placed in the upper strata (or above) of reflective polarizers 6, and is usually made up of the liquid crystal 8 be included between two polarizers 9.
Diffusive reflective plate 10 is placed in lower floor's (or below) of the light guide plate 3 in optical cavity 13, and by light reflection to display panels 7.It also reflects from reflective polarizers 6 and brightness enhancement film 5 layers of light reflected, and makes described polarisation of light randomization.Described diffusive reflective plate 10 has the surface of highly reflective, high diffusive, and this surface can strengthen the optical efficiency of optical cavity.The ground scattering of described diffusive reflective plate 10 diffusive reverberation, make light depolarization, and have high reflectance in visible wavelength range.
Fig. 2 is the transversal schematic diagram of the backlit liquid crystal optical display with the cold-cathode fluorescent lamp source adopting diffusive reflective plate of the present invention.In optical display 1 in fig. 2,3 fluorescent lamps 12 are placed in optical cavity 13.All these lamps can be white, or each lamp can be that selected color is as red, green and blue.Optical cavity 13 has the diffusive reflective plate 10 comprising reflecting layer of the present invention compound as liner.Diffusive reflective plate 10 not only increases reflectivity, and the light of abundant hybrid separation forms the light source that has good space luminescence uniformity, for illuminating display panels 7.
Therefore, the present invention includes diffuse goods, it comprises diffuse reflector compound of the present invention.
The present invention also comprises optical display, and it comprises:
I () defines the structure of optical cavity;
(ii) light source of described optical cavity is positioned at;
(iii) from described light source light through display floater; With
(iv) diffusive reflective plate of diffuse reflector compound of the present invention is comprised;
Wherein said diffusive reflective plate be positioned at described optical cavity in order to by the light from light source from the surface reflection of described diffusive reflective plate towards described display floater.
The present invention also comprises the method for improvement of the light reflectivity needing light diffuse device, and it comprises:
Providing package is containing the diffusive reflective plate of diffuse reflector compound of the present invention; With
Described diffusive reflective plate is placed in described device to make light be reflected from the surface of described diffusive reflective plate.
Material herein, method and embodiment are only exemplary, and unless stated otherwise, should not be construed as restrictive.Although can use and those similar or equivalent method and materials as herein described when implementing or test is of the present invention, this document describes applicable method and material.
embodiment
Abbreviation " E " expression " embodiment ", " CE " expression " comparative example ", numeral thereafter shows diffuse reflector compound is prepared in which embodiment.Embodiment and comparative example are prepared all in a similar manner and test.Except as otherwise noted, percentage is percentage by weight.
table 1
prepare the universal method of diffuse reflector compound
Diffuse reflector compound utilizes laminator (Meansunoptoelectronicstechnologyco., ltd, China) standby according to the laminated legal system of dry type.The parameter of laminating method of the present invention is listed in table 2.
table 2
*the structure of diffuse reflector compound is by expression of abridging: non-woven HDPE sheet material (a) is abbreviated as " (a) ", PET film (b) is abbreviated as " (b) ", PE film (c) is abbreviated as " (c) ", second PET film (d) is abbreviated as " (d) ", and adhesive is abbreviated as " adh ".Numeral " n " after abbreviation refers to for the definite material in this embodiment.Such as, (a1) refers to and to list in the table 1 of the material number with non-woven HDPE sheet material (a1) film.
*drying tunnel is a series of 6 sections of baking ovens; Each segment length 6m, and there is different temperature settings.
With ethyl acetate, adhesive-1 or adhesive-2 are diluted to solids content be the solution of about 30% and inject adhesive glue groove.Winding up roller Speed Setting is 15m/min.As shown in Figure 3, PET film (b) is supplied on the first let off roll 21, launch, and the rough surface on its two sides is made by sided corona treatment 22, then in glue groove 23, be coated with PET film (b) with binder solution, and make its 6-section drying tunnel 26 under institute's temp. displaying function in table 2 be in micro-sticky and not dry state with PET film (b) surface making adhesive be coated with.Finally, laminated together with non-woven HDPE sheet material (a) supplied by the second let off roll 28 by the surface of the PET film (b) under the roll-in that the composite roll 27 in laminator is shown in table 2, adhesive is coated with, and rolling on wind-up roll 29, obtain the composite of 2 layers thus, its structure is [(a)/adh/ (b)].
According to similar method, this laminate of 2 layers is supplied from the first let off roll, omit sided corona treatment and selected binder solution is coated on the surface of PET film (b), after solvent evaporation, it is laminated together with the shiny surface of the non-imprinted pattern of PE film (c) supplied by the second let off roll, obtain the diffuse reflector compound of 3 layers of the present invention thus, its structure is [(a)/adh/ (b)/adh/ (c)].
For the embodiment of diffuse reflector compound with 4 layers, second PET film (d) is supplied by the first let off roll, its rough surface is made by sided corona treatment, it is made to be coated with identical adhesive, by described drying tunnel dry adhesive, then laminated together with non-woven HDPE sheet material (a) of the 3 layers of diffuse reflector compound obtained by above-mentioned steps, the diffuse reflector compound of obtained 4 layers thus, structure is [(d)/adh/ (a)/adh/ (b)/adh/ (c)].
method of testing
The thickness of embodiment sample is measured by calibrator (ST-022 can buy from ONOSOKKICo., LTD.) sum digit formula thickness counter (DG-4140).At the test sample that 20 positions (10 places along the longitudinal and 10 places along transverse direction) size up is 20cmx20cm, and get its mean value according to testing standard ISO534.
X-riteSP64 spectrophotometer (can obtain from X-RiteInc) is utilized to measure reflectivity.With light source/visual angle D65/10 ° and the aperture correction of 8mm diameter measurement to X-Rite calibration criterion.Output valve is the reflectivity percentages under each wavelength, and the spectral region measured is 380nm-750nm, take 5nm as interval.For each test sample, at 20cm 2on area, random reading 20 readings, get its mean value.The comparison between sample is used at the reflectivity of 550nm.
According to ASTMD523, measure glossiness by Micro-TRI-Gloss instrument (can obtain from BYKGardner).The comparison between sample is used for the glossiness of 85 °.
The method of testing of the damp heat test of laminated sample is as follows: be placed in by the test sample being of a size of 21cm (longitudinal direction) × 29.7cm (transverse direction) between two blocks of bigger sheet glass of size, and the test sample of this interlayer is placed in the damp heat box (SETH-Z-022R, ShanghaiESPECEnvironmentalEquipmentCorp.) 100 hours of 60 DEG C/85%RH (relative humidity).Before and after damp heat test, lain in by sample in a plane, visual assessment respectively tests the flatness of sample, and grades as follows:
" " refer to that sample is completely smooth, without any gauffer and ripple;
But "○" refers to that the edge of sample is slightly curling does not have gauffer and ripple;
"●" refers to the edge curl of sample, and slightly gauffer and ripple; With
"×" refers to sample film severe curl and/or has serious gauffer and ripple.
According to testing standard ISO868-2003E and 15 seconds dwell times, use shore A & DS1902 instrument, measures hardness Shore D.
Embodiment of the present invention limit in the examples below further.The structure of embodiment and comparative example and evaluation result are shown in table 3 to 4.
table 3
*" front ": before damp heat test, " afterwards ": after damp heat test.
Obvious to draw a conclusion by the result in table 3.
Compare between CE1 and E1-E13, the former has the structure of 2-layer, although have the high reflectance (> 96%) at 550nm, high gloss (about 87%) shows that the major part of total reflectivity is from mirror-reflection instead of diffusion.By contrast, the diffuse reflector compound of all E1-E13 of the present invention all has the total reflectivity of 94%-96% at 550 nm and glossiness is 3%-8%.The glossiness lower far away of embodiment shows, the total reflectivity of laminates of the present invention is because light diffusion.Result shows, laminates of the present invention, when diffusive reflective plate in the BLU module being used as diffuse goods or optical display, can provide uniform visual angle.
The relatively result of E1-E3, show non-woven HDPE sheet material (a1), (a2) or (a3) thickness very little on the impact of reflectivity data.E2 demonstrates the exclusive embodiment that its flatness becomes bad after damp heat test, and this may be because it is laminates the thinnest in all embodiments.
Relatively the reflectivity data of E1 and E5 shows, when other layer identical, white PET film (b2) is better than the identical transparent PET film (b3) of thickness slightly.
Relatively E8 and CE2, E8 use the clear PE film (c4) having imprinted pattern, and CE2 then uses the clear PE film (c5) without imprinted pattern, and data show that the slightly high glossiness of the reflectivity of E8 is then far below the numerical value of CE2.Otherwise the data comparing E1 and E8 show, white PE film (c3) and transparent PE film (c4) do not have difference to reflectivity.In addition, as long as their PE mould is printed on identical pattern, gloss value is also similar.Therefore these results show have PE film (c) of imprinted pattern to be the key of giving laminates tool diffuse of the present invention strongly.
Relatively the data of E1, E9, E10 and E11 show, no matter whether adhesive type (polyacrylate or polyurethane) or adhesive be containing filler particles (adh-1, adh-2 contrast adh-3, adh-4), all do not affect its reflectivity.
E12 and E13 is the embodiment of 4 layered laminate, and it is by the non-woven HDPE sheet material the second PET film (d1) being applied to respectively E1 and E3 obtains.E1 and E12 compares, and E3 with E13 compares and show, except the gross thickness difference of laminates, the flatness change after its reflectivity, glossiness and damp heat test does not all have difference.Result shows, when the deflection needing in some applications to add or dimensional stability, then can add the second PET film (it can be hyaline membrane).
table 4
Material number or embodiment are numbered and structure Shore hardness (D)
Non-woven HDPE (a1) 43.5
PET film (b2) 75.2
PE film (c3) 27.4
E1：(a1)/adh-1/(b2)/adh-1/(c3) * 53.8
*hardness is the measured value on PE film (c3) surface of embodiment 1.
For the side illuminated back lighting device of LCD, backlight reflection sheet (namely diffuse reflector compound of the present invention places part) contacts equably with plastics light guide plate, and should be noted the surface not damaging plastics light guide plate.Therefore, the backlight reflection sheet with appropriate hardness is needed to wipe plastics light guide plate to avoid drawing together.Known PET film is too hard, and directly can not contact with plastics light guide plate, therefore, special face coat is used to PET reflector plate to avoid problems.But, thereby increase the cost of band coating type PET reflector plate.
In the present invention, PE film (c) is placed in the top of diffuse reflector compound, it has the intrinsic hardness lower than PET film, for the problems referred to above provide solution.The technique of this type of laminated PE film be coated with compared with uniform coating on a pet film, more simple and be easier to control.
As shown in table 4, the hardness of the white PE film impressed is 27.4 (Shore D), and this is really well below the hardness of white PET film.After laminated, the hardness of E1 laminates of the present invention is 53.8 (Shore D), still lower than the hardness of white PET film.
Although set forth in a typical implementation and describe the present invention, and be not intended to be limited to shown details, because can various adjustment and replacement be carried out when not deviating from spirit of the present invention.Therefore, by means of only normal experiment, those skilled in the art may expect various variant and the equivalents of invention disclosed herein, and this type of variants all and equivalents should be thought in the spirit and scope of the present invention limited by the claim of enclosing.

Claims (8)

1. the diffuse reflector compound that heat endurance is high, it comprises:
A () non-woven high density polyethylene HDPE sheet material, its thickness is 100-400 μm, and its basic weight is 30-210g/m 2;
(b) PET PET film, it comprises the filler particles (A) of 3-50 % by weight, and its thickness is 25-150 μm; With
(c) polythene PE film, it comprises the filler particles (B) of 0-30 % by weight, and its thickness is 10-100 μm;
Wherein
Described diffuse reflector compound has (a)/(b)/(c) structure;
PE film (c) of described diffuse reflector compound is towards display floater, and its surface pressure is printed on the pattern that the degree of depth is 1 μ m – 10 μm, and described pattern is random or orderly;
Described filler particles (A) and (B) are independently selected from titanium dioxide TiO 2, barium sulfate BaSO 4, polymetylmethacrylate and composition thereof; And
Described diffuse reflector compound have according to ASTME1349-06 measure be at least at 550nm 94% light reflectivity, and have according to ASTMD523 measure be less than 10% glossiness.
2. the diffuse reflector compound of claim 1, wherein said non-woven HDPE sheet material (a) and described PET film (b) are bonded by the first adhesive, and described PET film (b) and PE film (c) are bonded by the second adhesive.
3. the diffuse reflector compound of claim 1, it also comprises (d) the second PET PET film, it comprises the filler particles (C) of 0-30 % by weight and its thickness is 25-150 μm, wherein said diffuse reflector compound has (d)/(a)/(b)/(c) structure, described second PET film (d) is bonded on the side of described non-woven HDPE sheet material (a) by the 3rd adhesive, this side is contrary with the side at described first PET film (b) place, and described filler particles (C) is selected from TiO 2, BaSO 4, PMMA and composition thereof.
4. the diffuse reflector compound of Claims 2 or 3, wherein said first, second, and third adhesive is independently selected from polyurethane, polyacrylate, polyepoxide and composition thereof.
5. the diffuse reflector compound of claim 4, what wherein said first, second, and third adhesive comprised 0%-30% is selected from TiO independently of one another 2, BaSO 4, PMMA and composition thereof filler particles (D), wherein said filler particles (D) and filler particles (A), (B) or (C) are identical or different.
6. diffuse goods, it comprises the diffuse reflector compound of claim 1.
7. optical display, it comprises:
I () defines the structure of optical cavity;
(ii) light source of described optical cavity is positioned at;
(iii) from described light source light through display floater; With
(iv) diffusive reflective plate of the diffuse reflector compound of claim 1 is comprised;
Wherein said diffusive reflective plate be positioned at described optical cavity in order to by the light from light source from the surface reflection of described diffusive reflective plate towards described display floater.
8. improve the method needing the light reflectivity of light diffuse device, it comprises:
Providing package is containing the diffusive reflective plate of the diffuse reflector compound of claim 1; With
Described diffusive reflective plate is placed in described device to make light be reflected from the surface of described diffusive reflective plate.
CN201110460223.2A 2011-12-31 2011-12-31 Comprise the diffuse reflector compound of nonwoven sheet Expired - Fee Related CN103182819B (en)

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