Uv-strengthening glue composition, optical reading head with its using and optical recording/reproducing device comprising optical reading head

FIELD: glue compositions.

SUBSTANCE: invention relates to UV-strengthening glue compositions used for gluing polymethylmethacrylate with metal. Proposed composition comprises oligourethane-acrylate representing product of interaction of oligobutadienediol of molecular mass 2000-3000 Da, aliphatic or aromatic diisocyanate and hydr(o)oxyalkylmethacrylate taken in the molar ratio = 1:2:2, reactive monomer-diluting agent representing a mixture of mono- and polyfunctional methacrylate, polymeric filling agent - polyethylene of high density with particles size below 50 mcm, photoinitiating agent, antioxidant of phenolic type and adhesion promoter - a mixture of chlorinated polyvinyl chloride with chlorine content 62-64 wt.-% and oxalic acid, and the composition comprises additionally thixotropic agent - aerosil with specific surface 175-380 m2/g and ester plasticizing agent. Invention provides the development of UV-strengthening glue composition showing the thixotropy coefficient K = 2-3, shrinkage 4%, not above, break off strength both in the parent state and after heat effect, moisture and temperature drop 1.5 MPa, not less, and stability in storage above one year. The composition can be used as adhesive in electronic devices, such as optical reading head, thin-film transistor - mesomorphic display and organic electroluminescent unit.

EFFECT: valuable properties of composition.

5 cl, 2 tbl, 5 dwg, 8 ex

 

The technical field

The present invention relates to UV-curable composition used for gluing of polymethylmethacrylate with metal, with thixotropes, low shrinkage, high adhesive strength and ability for long-term storage without changing the operational properties, and the use of the above compositions as an adhesive for electronic devices, such as optical read head, a thin-film transistor liquid - crystal display (TFT-LCD) and an organic electroluminescent element (EL).

Prior art

Analysis of patent literature revealed a number of patents on UV-curable adhesives. Thus, the described composition UV curing, is used as adhesive for optical disks (U.S. patent No. 6337118, WV 3/02, publ. 08.01.2002). The composition consists of 5-85 wt.% oligoamenorrhea with different oligomeric blocks, including with ether and polybutadiene, 0.5 to 30 wt.% hydroxyethylmethacrylate, 20-50 wt.% monofunctional monomers-thinners (isobutylacetate, derivatives of tricyclodecane, N-vinylamides, polyfunctional cross-linking agents, including triethylene glycol dimethacrylate, trimethylolpropane (SR-350) and others, 1-10% of photoinitiator (Irgacure 184, 651, and others). The composition contains the power is inhibiting adhesion promoters and functional additives.

The adhesive according to the statement of the authors cures quickly, has good teploprovodnostyu, has good adhesion to polymethylmethacrylate, polycarbonate, metals, although quantitative characteristics in the patent is not given.

However, this composition cannot be applied in the specific conditions required to implement the present invention, since it is not thixotropic, it does not put the filler, and therefore, she must be increased shrinkage (at least 5-6%).

The prototype of the present invention is a UV-curable composition used in the production of DVD for bonding polymeric substrates, polycarbonate, polyacrylate, polivinilovogo types of metals (Au, Ag, Al, etc.) (U.S. patent No. 6017603, C08F 2/46, publ. 25.01.2000), consisting of 10-30 wt.% apoximately bisphenola type (mm 450-3000), 30-50 wt.% algorithmically (mm 400-10000) with simple and complex polyester, polycarbonate and other blocks; 10-80 wt.% methacrylate monomer (isobornyl(meth)acrylate, dicyclopentadienyl(meth)acrylate, hydroabietyl-(meth)acrylate/ ethoxyethylacetate and others); from 0.01 to 20 wt.% photoinitiator ("Jrgacure 184, Jrgacure 1800). If necessary, it is injected polymers of high molecular weight, including polivinilovogo type and the like. The composition can be introduced silane adhesion promoters, and the antioxidant is dant, the filler. The composition has good adhesion strength with the above substrates; however, shrinkage, as in other U.S. patent No. 6472451, C08F 2/46, epubl on adhesive to DVD, and optionally containing a monomer-diluent neurilemmoma type and tilne connection, is the value of >5.4 percent. When used in the composition of the prototype polymeric filler, for example, polyethylene can be reduced shrinkage, but will decrease adhesive strength. Therefore, the composition of the prototype could not be applied in the required optical devices.

Disclosure of inventions

The authors were tasked to create a UV-curable adhesive composition with a thixotropy coefficient K=2-3, shrinkage is not more than 4%, the strength at the margin for substrate poly (methyl methacrylate)-metal (steel 12X18H10T) as in the initial state and after exposure to heat, moisture, temperature difference is not less than 1.5 MPa and storage stability ≥1 year.

To solve the problem applying the UV-curable composition, consisting of:

wt.%
oligoethercarbonatemethacrylate10-30
the reactive monomer diluent -
a mixture of mono - and polyfunction the social methacrylates 32-46
polymer filler is polyethylene high
density with particle size up to 50 microns20-30
photoinitiator2,5-5,0
antioxidant phenolic type0,005-0,02
chlorinated polyvinyl chloride content
chlorine 62-64 wt.%3,0-10,0
oxalic acid0,3-2,0
thixotropic agent Aerosil with specific
surface 175-380 m2/g0,5-3,0
ester plasticizer1,0-10,0.

As oligoethercarbonatemethacrylate uses the product of the interaction oligonucleotide with 2000-3000 mm, aliphatic or aromatic diisocyanate and hydroxyalkyl(meth)acrylate in a molar ratio of 1:2:2. Oligomerization is the product of polymerization of 1,3-butadiene with 1/4 - and 1,2 - joining of monomer units. Preferably used oligomer containing ˜30% of the links of 1/4 - and ˜70% 1,2 - units.

From diisocyanates used hexamethylenediisocyanate and its substituted analogues, isophorondiisocyanate, 2,4-toluylenediisocyanate and other

Hydroxyethylmethacrylate can be hydroc metilmetakrilat hydroxypropylmethacrylate, hydroxyethylmethacrylate and other

Oligoethercarbonatemethacrylate used as individual compounds and mixtures. Preferred is a mixture of aliphatic and aromatic urethaneacrylate mass ratio of 1-1 .5:1.

The monomer-diluent comprises a mixture of monofunctional methacrylates with cyclic substituents (isobornyl, tetrahydrofurfuryl, dicyclopentadienyl-), methacrylate higher alcohol (octylacrylate) and polyfunctional methacrylates (deletecriticalsection, trimethacrylate-trimethylolpropane and others).

In the adhesive composition comprises a thixotropic agent Aerosil surface 175-380 m2/g, which can be used in a mixture with BYK-410 or BYK-S-740, which improve the dispersibility of Aerosil in the composition. BYK-410 is a solution of a modified urea functional groups in p-organic (www.familyhome.by), and BYK-S-740 is a composition of exopolitical with paraffin (http://chem.eurohim.ru).

As the ester plasticizer composition may include dioctylphthalate, 2-butoxyaniline, benzyl-2-ethylhexyladipate and other

In the composition of the inventive UV-curable adhesive composition includes photoinitiator: Irgacure-184 (1-hydroxycyclohexyl-phenylketone), Irgacure-651 (2,2-dimethoxy-2-phenylacetophenone), Irgacure-819 (bis(2,4/6-trimethylbenzoyl)foilfast nooked), Darocur-1173 (2-hydroxy-2-methyl-1-phenylpropane-1-one), etc. and mixtures thereof.

As the phenolic antioxidant composition may contain p-methoxyphenol, BHT, hydroquinone, etc.

Further details will be described optical read head and the recording/reproducing drive using the above-mentioned UV curable adhesive compositions. The optical read head of the present invention includes a base and optical elements, which are glued to the base using the above-mentioned UV curable adhesive compositions as an adhesive. The configuration of the optical system in the optical read head of the present invention shown in figure 1. With reference to Figure 1 of the optical read head includes a light source 1 for emitting light with a predetermined wavelength, the grating 2 for scattering light from the light source into the beam of the 0-order and beam 1-order; collimating lens 3 to create a fiber-optic communication, which are parallel to each other; a lens 9 for forming an optical spot on a recording surface of the optical disk 10; a main light detector 7 for receiving light reflected from the recording surface of the optical disk 10, and determine the signal information and the error signal. Numeral 4 denotes a beamsplitter for directing light, emitted by the source of the Board 1 to the lens 9, and the light reflected from the optical disk 10 on the main light detector 7. Concave lens 6 may be placed between the coupler 4 and the main light detector 7. Concave lens 6 is used for the correction of astigmatism. The coupler 5 is also responsible for the diffraction of light focused by the lens 9 toward the front of the light detector 8. Front light detector 8 is used to determine the strength of the light. If a certain force of light is less than or exceeds a predefined level, the power of the light emitted from the light source 1 is adjusted to the light with the force of a predetermined level is reached, the optical disk 10.

Figure 2 shows the optical read head relative to the implementation of this invention. The optical read head includes an aluminum base. The above-mentioned optical elements are placed at predefined locations of the framework in order to attach it using UV-curable adhesive compositions of the present invention. For example, the grid 2 is fixed to the holder of the lattice basis, the laser diode is fixed on the holder diode substrate and the coupler 5 and the collimating lens is directly attached to the base. UV-curable adhesive composition of the present invention applied to a special place of Foundation or optical elements and for curing all rgota UV radiation.

Figure 3 demonstrates the application of UV-curable adhesive compositions of the present invention, when the lens is attached to the base in the optical reader head. The lens is attached to the blade drive basis. After UV-curable adhesive composition of the present invention deposited on a four point blade drive lens is placed and exposed to ultraviolet radiation for curing this composition.

Figure 4 demonstrates the application of UV-curable adhesive compositions of the present invention, when the coupler is attached to the base in the optical reader head. After UV-curable adhesive composition of the present invention applied to two points of the tap, it is placed on the canvas and is exposed to ultraviolet radiation for curing the composition.

Figure 5 shows the optical reading/ reproducing drive of the present invention. With reference to Figure 5, the tray 30 is included in the track groove 20 in such a way that slides into or out of the groove in the direction of arrow "A". The tray 30 is equipped with the spindle motor 31 and the base of the grip 33. Spindle motor 31 has a turning circle 32 on its rotating axis. When optical disc 10 is mounted on turntable 32, the spindle motor 31 starts to rotate the optical disc 10. Base capture 33 splits the zit in the radial direction (indicated by arrow "B") of the optical disk 10. The optical read head 40 is attached to the base of the grip 33 to access the recording surface of the optical disk 10 and the recording/reproduction of information.

As can be seen from the above, the UV-curable adhesive composition of this invention meets the requirements for low shrinkage and high adhesion. Adhesion with the base - beautiful. In addition, when the composition of the present invention is used in devices of microelectronics, such as an optical read head, a thin-film transistor - liquid crystal display and an organic electroluminescent elements, does not result in deformation and displacement. Therefore ensured the accuracy of the process. In addition, in the case of adding a thixotropic substance in the polymer composition does not occur it stretching like gluten caramel. The result prevented the reduction of electronic devices after applying adhesives on unwanted places.

The present invention is described below by examples, which are given to illustrate but not to limit the scope of the claims. In examples 1-2 are shown ways of getting oligoethercarbonatemethacrylate, preferably used in the inventive UV-curable adhesive composition.

Example 1

Getting oligoethercarbonatemethacrylate OMD-N

The reactor is loaded is raised to 150 g of liquid oligonucleotide (Krasol LBH-2000, Cauchy, Czech Republic) and with stirring, heated to 45-50°C. Then dosed with 18.6 g of hexamethylenediisocyanate at the rate of 1 g/min while maintaining a temperature of 55-60°C. After dosing reacciona was stirred for 4.5-5 hours at 55-60°until the content of isocyanate groups of 2.75% and then cooled to 45-50°C. In the reactor gradually add 17,76 g monomethacrylates with dissolved 0,093 g catalyst - dibutylthiourea tin at the rate of 1 g/min, the Temperature should not exceed 50-55°C. After the reaction mass is maintained under stirring for 7-8 hours at 55-60°With up to exhaustion of the isocyanate groups. Loaded 0,0186 g p-methoxyphenol and stirred for another 30 minutes.

The product is a viscous, colourless or slightly yellowish mass. Dynamic viscosity 66000 MPa·C.

Example 2

Getting oligoethercarbonatemethacrylate OMD-3000 T

The synthesis is carried out analogously to example 1 using as the diisocyanate - 2,4-toluylene diisocyanate.

Obtain UV-curable compositions (examples 3-9)

The mixing is carried out in a mixer with careful mixing of the components shown in table 1.

Physico-mechanical properties of UV-utverzhdenii composition

The strength of the detachment was determined on the adhesive joints polymetylmetacrylate with ECLA brand CO-120K (Russia) sample size 50× 50×6 mm with a cylindrical shape made of steel H HI FROM 25 mm diameter on the Instron tensile testing machine at a test speed of 20 mm per minute at +25°With:

I - strength 24 hours after gluing,

II - strength after exposure glued samples within 72 hours at +60°C and 95% humidity

III - strength after thermal Cycling (20 cycles) at +70°C (1 hour) ↔ -30°C (1 hour).

Shrinkage was determined by the ratio of the densities of the liquid adhesive and the polymer obtained from it.

The composition and properties of the compositions shown in tables 1 and 2.

td align="center"> -
Table 1

Formulation composition
The components of the compositionContent, wt.%
Example 3Example 4Example 5Example 6Example 7Example 8Example 9
According to the inventionTo compare
OMD-N8,114,220,1-8,18,18,1
OMD-3000 T7,513,7-17,47,57,57,5
Isobornylacrylat 15,212,415,0-15,215,215,2
Tetrahydrofurfurylamine---28---
Dimethacrylate, triethylene glycol--2,02,5---
Dicyclopentadienyltitanium28,416,622,7-28,428,428,4
Trimethylsilylpropyne0,51,0--0,50,50,5
Octylacrylate1,82,01/13,01,81,81,8
Chlorinated PVC with chlorine 62-64 wt.%4,23,55,68,04,24,2
Oxalic acid0,70,91,51,2-0,7-
Acrylic acid---- 1,1--
The dioctylphthalate1,8---1,81,81,8
Di-2-butoxyaniline-4,3-5,5---
Benzyl-2-ethylhexyladipate--the 3.8----
Aerosil A-1751,60,82,52,01,61,61,6
BYK-4100,10,10,10,10,10,10,1
BYK S-7400, 80,70,80,70,40,80,8
Irgacure-1842,94,2-2,32,92,92,9
Irgacure-6510,7---0,70,70,7
Irgacure-819---1,3---
Darocur-1173-the 3.8----
High-density polyethylene with a particle size up to 50 microns25,725,621,028,025,729,926,4
p-Methoxyphenol0,01*0,02*--0,01*0,01*0,01*
BHT---0,01*---
Hydroquinone--0,05*----
* parts by weight per 100 parts by weight of the composition

Table 2

Properties of UV-curable adhesive compositions
PropertiesExample 3Example 4Example 5Example 6Example 7Example 8Example 9
Shrinkage, %3,73,53,73,63,73,73,7
Strength at break, MPa
I8,27,46,88,04,33,13,0
II3,4the 3.83,04,11,80,50,6
III5,06,24,56,61,70,50, 6
The storage stability, the year11110,5--

Table 2 shows that the inventive composition meets the specified technical requirements than the known compositions by shrinkage and adhesion strength.

Although the present invention is illustrated by examples of its preferred embodiment, they in no way limit the claimed scope of the invention.

Thus, the composition according to the invention satisfies all requirements and is fully suitable for use in electronic devices.

1. UV-curable adhesive composition containing oligourethanes, of a reactive monomer-diluent which is a mixture of mono - and polyfunctional methacrylates, p is the polymer filler, photoinitiator, antioxidant phenolic type and the adhesion promoter, characterized in that it contains as an adhesion promoter mixture of chlorinated polyvinyl chloride with chlorine 62-64 wt.% and oxalic acid, as oligoaniline - product interaction oligonucleotide with 2000-3000 mm, aliphatic or aromatic diisocyanate and gidroksietilmetilts taken in the molar ratios 1:2:2, as a polymer filler is a high density polyethylene with a particle size of 50 μm, and further includes a thixotropic agent is presented with a specific surface area 175-380 m2/g and ester plasticizer in the following ratio of the components of the composition, wt.%:

the specified oligoethercarbonatemethacrylate10-30
reactive
the monomer-diluent32-46
the high density polyethylene20-30
photoinitiator2,5-5,0
antioxidant phenolic type0,005-0,02
chlorinated polyvinyl chloride
chlorinated 62-64 wt.%3,0-10,0
oxalic acid0,3-2,0
Aerosil0,5-3,0
ester plasticizer1,0-10,0

2. The composition according to claim 1, where the adhesion promoter is a mixture of chlorinated polyvinyl chloride with chlorine 62-64% and oxalic acid, taken in the mass ratio 10-5:1.

3. The optical read head, including the basis and optical elements, which are pasted on the canvas using UV-curable adhesive composition according to claims 1 and 2.

4. The optical read head according to claim 3, where the optical elements include an optical diode, grille, collimating lens, a beamsplitter, a reflecting mirror, the light detector, the detector front light, a lens, a concave lens and the main cover.

5. The optical recording/reproducing device includes an optical read head in accordance with paragraph 4.



 

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5 cl, 2 tbl, 5 dwg, 8 ex

FIELD: glue compositions.

SUBSTANCE: invention relates to UV-strengthening glue compositions used for gluing substrates metal-silicate glass in electronic devices, such as optical reading head, thin-film transistor - semiconducting mesomorphic display, organic luminescent unit. The composition comprises oligourethaneacrylate - a mixture of oligourethaneacrylates of two type: the first is prepared by interaction of oligooxyalkylenepolyol of molecular mass 1000-5000 Da, diisocyanate of aliphatic or aromatic structure and alkylene glycol monomethacrylate, and the second based on oligobutadienediol of molecular mass 2000-3000 Da, diisocyanate of aliphatic or aromatic structure and alkylene glycol monomethacrylate in the mass ratio of the first to the second = (1.0-4.0):1, reactive monomer as a diluting agent, silicate filling agent, organic tert.-butylperbenzoate, thixotropic agent - aerosil and photoinitiating agent, and, additionally, it comprises oxalic acid as adhesion promoter, silane dressing agent and antioxidant of phenolic type. Invention provides the development of UV-strengthening glue composition possessing thixotropy, high strengthening rate, high adhesion strength being especially at effect of heat and moisture, temperature drop, low shrinkage and stability in storage.

EFFECT: improved and valuable properties of composition.

7 cl, 2 tbl, 5 dwg, 8 ex

FIELD: chemistry.

SUBSTANCE: invention refers to a hot melt adhesive, using it and a method for adhesion of non-woven substrates. The hot melt adhesive is cross-linked by radiation and contains more than 35% of a polyurethane polymer at the hot melt adhesive. The polyurethane polymer in turns contains at least one reactive group polymerising by radiation generated by a reaction of A) reactive PU-prepolymer with a block structure with two or three NCO-groups per a molecule; one block has a structure of diisocyanate-polyol-diisocyanate and at least one block has a structure (diol-diisocyanate)n, wherein polyol=diol or triol with molecular weight (MN) more than 1,000 g/mole, diol=alkylene diol with molecular weight less than 300 g/mole and n is from 4 to 50, and B) is from 20 to 95 mole % of at least one low-molecular compound (B) containing a double bond polymerising by radical polymerisation, and a group reacting with NCO groups, and C) from 0 to 50 mole % of at least one compound (C), which has at least one group reactive to NCO groups, but is free from the groups polymerising under conditions of radical polimerisation with molecular weight from 32 to 4,000 g/mole and D) from 5 to 50 mole % of at least one radical light initiator (D), which has primary or secondary OH-groups; percentages refers to the number of NCO-groups of PU-prepolymer. The sum of B, C, D is supposed to make 100 mole %, and optionally containing additional polymers and/or additives.

EFFECT: producing the adhesive for adhesion of nonwoven substrates or for coating of labels, tapes and plasters with a self-adhesive layer.

20 cl, 6 ex

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