Resin blend

Abstract

Provided is a resin blend including a first resin and a second resin, the second resin having a hydrophobic functional group in a side chain and having a surface energy difference of 0.1 to 20 mN/m from the first resin at 25 C., wherein the resin blend is capable of forming a layer separation structure. Also, provided are a pellet, a method for preparing the same, and a resin molding article having a specific layer separation structure. The resin blend may not only improve mechanical properties and surface hardness of the molding article but also shorten process time, increase productivity and reduce production cost by omitting an additional surface coating step.

Claims

1. A resin blend comprising: a first resin; and a second resin having a surface energy difference of 5 to 20 mN/m from the first resin at 25 C., wherein the first resin is an ABS resin and the second resin is a (meth)acrylate-based resin having a hydrophobic polysiloxane functional group in a side chain, wherein the ABS resin and the (meth)acrylate-based resin have a melt viscosity difference of 300-500 pa*s at a shear rate of 100 to 1000 s.sup.1 and at a temperature of 210 to 240 C., wherein the second resin has a molecular weight distribution of 1.9 to 2.6 and is a polymer polymerized from a monomer blend containing 0.1 to 30 parts by weight of a monomer represented by the following Chemical Formula 1 as a polymerization unit based on 100 parts by weight of the entire monomer for polymerizing the second resin: ##STR00006## wherein, R.sub.3 is an alkyl group having 1 to 16 carbon atoms, R.sub.4 is a single bond or an alkylene group having 1 to 16 carbon atoms, Q is a single bond, COO, OCO, OCOO, CO, O or NH, R.sub.5 to R.sub.7 are each independently hydrogen or an alkyl group having 1 to 4 carbon atoms, R.sup.a to R.sup.f are each independently an alkyl group having 1 to 16 carbon atoms, and n is a number from 1 to 100, and wherein the resin blend forms a layer separation structure during a melt processing performed under shear rate of 100 to 1000 s.sup.1.

2. The resin blend of claim 1, wherein the second resin has higher glass transition temperature than the first resin and the first resin and the second resin have a glass transition temperature difference of 10 C. to 150 C.

3. The resin blend of claim 1, wherein the second resin has a weight average molecular weight of 30,000 to 200,000.

4. The resin blend of claim 1, wherein the second resin further includes at least one organic functional group selected from a group consisting of an alkyl group having 2 to 20 carbon atoms, an alicyclic ring having 5 to 40 carbon atoms, and an aromatic ring having 6 to 40 carbon atoms.

5. The resin blend of claim 1, wherein the second resin further includes a hydrogen bond donor and a hydrogen bond acceptor.

6. A method of preparing a resin molding article comprising: melting the resin blend of claim 1 to form a melt blend; and processing the melt blend to form a layer separation structure.

7. The method of preparing a resin molding article of claim 6, further comprising curing the layer separation structure of the resin blend.

8. The method of preparing a resin molding article of claim 6, wherein the melting and the processing are performed under shear stress.

9. The method of preparing a resin molding article of claim 7, wherein the curing is thermosetting or ultraviolet (UV) curing.

10. A resin molding article having a layer separation structure comprising: a first resin layer including the first resin of claim 1; a second resin layer including the second resin of claim 1 formed on the first resin layer; and an interface layer comprising the resin blend of claim 1 formed between the first resin layer and the second resin layer, wherein the layer separation structure is formed during a melt processing of the resin blend of claim 1 performed under shear rate of 100 to 1000 s.sup.1.

11. The resin molding article having a layer separation structure of claim 10, wherein components of the first resin layer are detected on the surface of the second resin layer by an infrared spectrometer.

Description

DESCRIPTION OF DRAWINGS

(1) FIG. 1 is schematic diagram of a resin blend as one example of the present application.

(2) FIG. 2 is schematic diagram of a resin blend as another example of the present application.

(3) FIG. 3 is schematic diagram of a layer separation structure formed of a resin blend including a first resin and a second resin as one example of the present application.

(4) FIG. 4 is schematic diagram of a layer separation structure formed of a resin blend including a first resin, a second resin, and a third resin as another example of the present application.

(5) FIG. 5 is schematic diagram of a layer separation structure as another example of the present application.

(6) FIG. 6 is schematic diagram of a pellet having a core and a shell.

(7) FIG. 7 shows a SEM photograph of a layer-separated cross-sectional morphology of a molding article prepared in Example 1.

(8) FIG. 8 shows a SEM photograph of a cross-sectional morphology of a molding article prepared in Comparative Example 1.

MODES OF THE INVENTION

(9) The present application will be described in more detail through the following Examples, which are not intended to limit the scope of the present application.

(10) Measurement of Glass Transition Temperature

(11) Glass transition temperature was measured using a differential scanning calorimeter (DSC823e, manufactured by Mettler-Toledo International Inc.). Specifically, 1 mg of the first resin sample or the second resin sample was placed on an aluminum pan, the pan was mounted on the measurement apparatus, and then the glass transition temperature was measured in a range of 50 C. to 300 C. (10 C./min, 2 cycle).

(12) Measurement of Surface Energy

(13) Surface energy was measured using a drop shape analyzer (DSA100, manufactured by KRUSS corporation) according to an Owens-Wendt-Rabel-Kaelble method.

(14) Specifically, 15 wt % of the first resin or the second resin was dissolved in a methyl ethyl ketone solvent, with which an LCD glass was bar-coated. Subsequently, the coated LCD glass was pre-dried for 2 minutes in oven at 60 C., and dried for 1 minute in oven at 90 C.

(15) After drying (or curing), deionized water and diiodomethane each were added dropwise 10 times onto the coated surface, and an average value of contact angles was determined, surface energy was calculated by the Owens-Wendt-Rabel-Kaelble method with the substitution of the average value.

(16) Measurement of Melt Viscosity

(17) Melt viscosity was measured using a capillary rheometer (Capillary Rheometer 1501, manufactured by Gottfert Inc.).

(18) Specifically, a capillary die was attached to a barrel filled with the first resin or the second resin three times. Subsequently, shear viscosity (pa*s) was measured according to a shear rate of 100 to 1000 s.sup.1 at a processing temperature of 240 C.

(19) Measurement of Molecular Weight Distribution (PDI) and Weight Average Molecular Weight (Mw)

(20) A molecular weight distribution was measured using Gel permeation chromatography (GPC), and conditions thereof were as follows: Apparatus: 1200 series manufacture by Agilent technologies Inc. Column: Use of two PLgel mixed B's manufactured by Polymer laboratories Inc. Solvent: THF Column temperature: 40 C. Sample concentration: 1 mg/mL, 100 L injection Standard: polystyrene (Mp: 3900000, 723000, 316500, 52200, 31400, 7200, 3940, 485)

(21) ChemStation manufactured by Agilent technologies Inc. was used as an analysis program, weight average molecular weight (Mw) and number average molecular weight were determined by GPC, and the molecular weight distribution was calculated as the weight average molecular weight (Mw) divided by the number average molecular weight (Mw).

(22) Observation of Cross-Sectional Morphology

(23) Layer-separated cross-sectional morphology was observed by SEM after subjecting a specimen of each of Examples and Comparative Examples to a low temperature impact test and etching a broken surface with THF vapor. Meanwhile, in order to measure the thickness of each of the layer-separated first resin layer, second resin layer and interface layer, the specimen of each of the Examples and Comparative Examples was cut with a diamond cutter at 120 C. using a microtoming apparatus (Leica EM FC6), to make a cross-section smooth. A cross-sectional portion of the specimen including the smooth cross-section was dipped and etched for 10 seconds in 1,2-dichloroethane solution (10 volume %, in EtOH), and then washed with distilled water. The etched cross-section portion is dissolved differently depending on the content of each of the first resin and the second resin, which may be observed using SEM. In other words, the first resin layer, the second resin layer, and the interface layer were observed through shadows by viewing the cross-section from above 45 from the surface using SEM, and the thickness of each layer could be measured.

(24) Pencil Hardness Test

(25) Surface pencil hardness of a specimen of each of the Examples and Comparative Examples under a predetermined gravity of 500 g was measured using a pencil hardness tester (chungbuk technology). While a standard pencil (Mitsubishi Corporation) was changed to 6B to 9H, the change rate at the surface was observed by applying a scratch with the pencil keeping an angle of 45 (ASTM 3363-74). A measurement result was calculated by averaging results of five repeated tests.

(26) Impact Resistance Measurement Test

(27) Impact resistance of the specimen prepared in each of the Examples and Comparative Examples was measured according to ASTM D256. Specifically, energy (Kg*cm/cm) for breaking a V-type notched specimen after raising a weight hung at the end of a pendulum was measured using an impact testing machine (Impact 104, manufactured by Tinius Olsen Inc.). Impact resistance of each of and specimens was calculated by averaging the results of five measurements.

(28) Surface Analysis by Infrared Spectrometer (IR)

(29) Spectrum measurement and data processing were performed using Win-IR PRO 3.4 software (Varian, USA), using a UMA-600 infrared microscope equipped with a Varian FTS-7000 spectrometer (Varian, USA) and a mercury cadmium telluride (MCT) detector, and conditions thereof were as follows. Germanium (Ge) ATR crystal having a refractive index of 4.0 Scanning mid-infrared spectrum from 4000 cm.sup.1 to 600 cm.sup.1 by 16 at a spectral resolution of 8 cm.sup.1 by an attenuated total reflection (ATR) method Internal reference band: carbonyl group of acrylate (CO str., 1725 cm.sup.1) Inherent component of first resin: butadiene compound [CO str.(1630 cm-1) or CH out-of-plane vib.(970 cm-1)]

(30) Peak intensity ratio [IBD(CC)/IA(CO)] and [IBD(out-of-plane)/IA(CO)] were calculated, and spectrum measurement was performed five times in different regions of one sample, and an average value and standard deviation were calculated.

Example 1

(1) Preparation of First Resin and Second Resin and Measurement of Physical Properties

(31) As a first resin, a thermoplastic resin consisting of 60 wt % of methyl methacrylate, 7 wt % of acrylonitrile, 10 wt % of butadiene, and 23 wt % of stryrene was used. In order to prepare a second resin, 1500 g of distilled water and 4 g of 2% aqueous polyvinylalcohol solution as a dispersant were added and dissolved in a 3 L reactor. Subsequently, 776 g of methyl methacrylate and 24 g of methacryloxypropyl terminated polydimethylsiloxane (PDMS, Mw:420), 2.4 g of n-dodecyl mercaptane as a chain transfer agent, and 2.4 g of azobisdimethylvaleronitrile as an initiator were additionally added to the reactor, followed by stirring at 400 rpm. The blend was reacted and polymerized for 3 hours at 60 C., and cooled to 30 C. to obtain a second resin (A) with a bead shape. Subsequently, the second resin (A) was washed three times with distilled water and dehydrated, and then was dried in an oven.

(32) The first resin and the second resin (A) had a surface energy difference of 7 mN/m and a melt viscosity difference of 300 pa*s. The first resin had a glass transition temperature of 70 C. and the second resin (A) had a glass transition temperature of 104 C. The second resin (A) had a weight average molecular weight of 100 K and a molecular weight distribution (PDI) of 1.9, which were measured by GPC.

(2) Preparation of Resin Blend and Measurement of Physical Properties

(33) 90 parts by weight of the first resin and 10 parts by weight of the second resin (A) were mixed and extruded at a temperature of 240 C. using a twin screw extruder (Leistritz corporation) to obtain a pellet. Then, the pellet was injected at a temperature of 240 C. in a EC10030 injector (ENGEL) to manufacture a resin molding specimen 1 having a thickness of 3200 m. The layer separation phenomenon was observed in the specimen, which included a second resin layer having a thickness of 18 m and an interface layer having a thickness of 8 m, a pencil hardness of H, and an impact resistance of 9 kg*cm/cm in the case of IZOD and of 9 kg*cm/cm in the case of IZOD .

Example 2

(1) Preparation of First Resin and Second Resin and Measurement of Physical Properties

(34) A first resin was the same as in Example 1, and a second resin (B) was prepared in the same manner as in Example 1, except that 776 g of methyl methacrylate and 24 g of methacryloxypropyl terminated polydimethylsiloxane (Mw:420) were changed to 760 g of methyl methacrylate, 24 g of methacryloxypropyl terminated polydimethylsiloxane (Mw:1000).

(35) The first resin and the second resin (B) had a surface energy difference of 13 mN/m and a melt viscosity difference of 330 pa*s. The second resin (B) had a glass transition temperature of 103 C., a weight average molecular weight of 100 K, and a molecular weight distribution of 2.1, which were measured by GPC.

(2) Preparation of Resin Blend and Measurement of Physical Properties

(36) A specimen 2 having a thickness of 3200 m was prepared in the same manner as in Example 1, except that the second resin (B) was used. The layer separation phenomenon was observed in the specimen, which included a second resin layer having a thickness of 43 m and an interface layer having a thickness of 19 m, a pencil hardness of 2H, and an impact resistance of 9 kg*cm/cm in the case of IZOD and of 9 kg*cm/cm in the case of IZOD .

Example 3

(1) Preparation of First Resin and Second Resin and Measurement of Physical Properties

(37) A first resin was the same as in Example 1, and a second resin (C) was prepared in the same manner as in Example 1, except that 776 g of methyl methacrylate and 24 g of methacryloxypropyl terminated polydimethylsiloxane (Mw:420) were changed to 760 g of methyl methacrylate and 24 g of methacryloxypropyl terminated polydimethylsiloxane (Mw:5000).

(38) The first resin and the second resin (C) had a surface energy difference of 14 mN/m and a melt viscosity difference of 335 pa*s. The second resin (C) had a glass transition temperature of 100 C., a weight average molecular weight of 100 K, and a molecular weight distribution of 2.4, which were measured by GPC.

(2) Preparation of Resin Blend and Measurement of Physical Properties

(39) A specimen 3 having a thickness of 3200 m was prepared in the same manner as in Example 1, except that the second resin (C) was used. The layer separation phenomenon was observed in the specimen, which included a second resin layer having a thickness of 35 m and an interface layer having a thickness of 26 m, a pencil hardness of H, and an impact resistance of 8 kg*cm/cm in the case of IZOD and of 8 kg*cm/cm in the case of IZOD .

Example 4

(1) Preparation of First Resin and Second Resin and Measurement of Physical Properties

(40) A first resin was the same as in Example 1, and a second resin (D) was prepared in the same manner as in Example 1, except that 776 g of methyl methacrylate and 24 g of methacryloxypropyl terminated polydimethylsiloxane (Mw:420) were changed to 744 g of methyl methacrylate and 56 g of methacryloxypropyl terminated polydimethylsiloxane (Mw:1000).

(41) The first resin and the second resin (D) had a surface energy difference of 15 mN/m and a melt viscosity difference of 390 pa*s. The second resin (D) had a glass transition temperature of 100 C., a weight average molecular weight of 100 K, and a molecular weight distribution of 2.5, which were measured by GPC.

(2) Preparation of Resin Blend and Measurement of Physical Properties

(42) A specimen 4 having a thickness of 3200 m was prepared in the same manner as in Example 1, except that the second resin (D) was used. The layer separation phenomenon was observed in the specimen, which included a second resin layer having a thickness of 43 m and an interface layer having a thickness of 34 m, a pencil hardness of 1.5H, and an impact resistance of 8 kg*cm/cm in the case of IZOD and of 8 kg*cm/cm in the case of IZOD .

Example 5

(1) Preparation of First Resin and Second Resin and Measurement of Physical Properties

(43) A first resin was the same as in Example 1, and a second resin (E) was prepared in the same manner as in Example 1, except that 776 g of methyl methacrylate and 24 g of methacryloxypropyl terminated polydimethylsiloxane (PDMS, Mw:420) were changed to 720 g of methyl methacrylate and 80 g of methacryloxypropyl terminated polydimethylsiloxane (PDMS, Mw:1000).

(44) The first resin and the second resin (E) had a surface energy difference of 18 mN/m and a melt viscosity difference of 420 pa*s. The second resin (E) had a glass transition temperature of 97 C., a weight average molecular weight of 100 K, and a molecular weight distribution of 2.6, which were measured by GPC.

(2) Preparation of Resin Blend and Measurement of Physical Properties

(45) A specimen 5 having a thickness of 3200 m was prepared in the same manner as in Example 1, except that the second resin (E) was used. The layer separation phenomenon was observed in the specimen, which included a second resin layer having a thickness of 48 m and an interface layer having a thickness of 36 m, a pencil hardness of H, and an impact resistance of 7 kg*cm/cm in the case of IZOD and of 7 kg*cm/cm in the case of IZOD .

Example 6

(1) Preparation of First Resin and Second Resin and Measurement of Physical Properties

(46) A first resin was the same as in Example 1, and a second resin (F) was prepared in the same manner as in Example 1, except that 776 g of methyl methacrylate and 24 g of methacryloxypropyl terminated polydimethylsiloxane (Mw:420) were changed to 536 g of methyl methacrylate, 240 g of cyclohexyl methacrylate and 24 g of methacryloxypropyl terminated polydimethylsiloxane (Mw:1000).

(47) The first resin and the second resin (F) had a surface energy difference of 14 mN/m and a melt viscosity difference of 460 pa*s. The second resin (F) had a glass transition temperature of 100 C., a weight average molecular weight of 100 K, and a molecular weight distribution of 2.2, which were measured by GPC.

(2) Preparation of Resin Blend and Measurement of Physical Properties

(48) A specimen 6 having a thickness of 3200 m was prepared in the same manner as in Example 1, except that the second resin (F) was used. The layer separation phenomenon was observed in the specimen, which included a second resin layer having a thickness of 86 m and an interface layer having a thickness of 29 m, a pencil hardness of 2.5H, and an impact resistance of 9 kg*cm/cm in the case of IZOD and of 9 kg*cm/cm in the case of IZOD . Peak intensity ratio [IBD(CC)/IA(CO)] measured by an infrared spectrometer had an average value of 0.0122 and a standard deviation of 0.0004. Peak intensity ratio [IBD(out-of-plane)/IA(CO)] measured by an infrared spectrometer had an average value of 0.415 and a standard deviation of 0.0028.

Example 7

(1) Preparation of First Resin and Second Resin and Measurement of Physical Properties

(49) A first resin was the same as in Example 1, and a second resin (G) was prepared in the same manner as in Example 1, except that 776 g of methyl methacrylate and 24 g of methacryloxypropyl terminated polydimethylsiloxane (Mw:420) were changed to 536 g of methyl methacrylate, 240 g of phenyl methacrylate and 24 g of methacryloxypropyl terminated polydimethylsiloxane (Mw: 1000).

(50) The first resin and the second resin (G) had a surface energy difference of 16 mN/m and a melt viscosity difference of 445 pa*s. The second resin (G) had a glass transition temperature of 105 C., a weight average molecular weight of 100 K, and a molecular weight distribution of 2.1, which were measured by GPC.

(2) Preparation of Resin Blend and Measurement of Physical Properties

(51) A specimen 7 having a thickness of 3200 m was prepared in the same manner as in Example 1, except that the second resin (G) was used. The layer separation phenomenon was observed in the specimen, which included a second resin layer having a thickness of 90 m and an interface layer having a thickness of 32 m, a pencil hardness of 2.5H, and an impact resistance of 9 kg*cm/cm in the case of IZOD and of 9 kg*cm/cm in the case of IZOD .

Example 8

(1) Preparation of First Resin and Second Resin and Measurement of Physical Properties

(52) A first resin was the same as in Example 1, and a second resin (H) was prepared in the same manner as in Example 1, except that 776 g of methyl methacrylate and 24 g of methacryloxypropyl terminated polydimethylsiloxane (Mw:420) were changed to 536 g of methyl methacrylate, 120 g of acrylamide, 120 g of hydroxyethyl methacrylate, and 24 g of methacryloxypropyl terminated polydimethylsiloxane (Mw:1000).

(53) The first resin and the second resin (H) had a surface energy difference of 5 mN/m and a melt viscosity difference of 390 pa*s. The second resin (H) had a glass transition temperature of 125 C., a weight average molecular weight of 100 K, and a molecular weight distribution of 2.3, which were measured by GPC.

(2) Preparation of Resin Blend and Measurement of Physical Properties

(54) A specimen 8 having a thickness of 3200 m was prepared in the same manner as in Example 1, except that the second resin (H) was used. The layer separation phenomenon was observed in the specimen, which included a second resin layer having a thickness of 63 m and an interface layer having a thickness of 27 m, a pencil hardness of 2H, and an impact resistance of 7 kg*cm/cm in the case of IZOD and of 7 kg*cm/cm in the case of IZOD .

Example 9

(1) Preparation of First Resin and Second Resin and Measurement of Physical Properties

(55) A first resin was the same as in Example 1, and a second resin (I) was prepared in the same manner as in Example 1, except that 776 g of methyl methacrylate and 24 g of methacryloxypropyl terminated polydimethylsiloxane (Mw:420) were changed to 536 g of methyl methacrylate, 240 g of hydroxyethtyl methacrylate, and 24 g of methacryloxypropyl terminated polydimethylsiloxane (Mw: 1000).

(56) The first resin and the second resin (I) had a surface energy difference of 6 mN/m and a melt viscosity difference of 440 pa*s. The second resin (I) had a glass transition temperature of 110 C., a weight average molecular weight of 100 K, and a molecular weight distribution of 2.0, which were measured by GPC.

(2) Preparation of Resin Blend and Measurement of Physical Properties

(57) A specimen 9 having a thickness of 3200 m was prepared in the same manner as in Example 1, except that the second resin (I) was used. The layer separation phenomenon was observed in the specimen, which included a second resin layer having a thickness of 52 m and an interface layer having a thickness of 28 m, a pencil hardness of H, and an impact resistance of 9 kg*cm/cm in the case of IZOD and of 9 kg*cm/cm in the case of IZOD .

Example 10

(1) Preparation of First Resin and Second Resin and Measurement of Physical Properties

(58) A first resin was the same as in Example 1, and a second resin (J) was prepared in the same manner as in Example 1, except that 776 g of methyl methacrylate and 24 g of methacryloxypropyl terminated polydimethylsiloxane (Mw:420) were changed to 536 g of methyl methacrylate, 120 g of vinylpyrrolidone, 120 g of hydroxyethyl methacrylate, and 24 g of methacryloxypropyl terminated polydimethylsiloxane (Mw:1000).

(59) The first resin and the second resin (J) had a surface energy difference of 5 mN/m and a melt viscosity difference of 400 pa*s. The second resin (J) had a glass transition temperature of 113 C., a weight average molecular weight of 100 K, and a molecular weight distribution (PDI) of 2.3, which were measured by GPC.

(2) Preparation of Resin Blend and Measurement of Physical Properties

(60) A specimen 10 having a thickness of 3200 m was prepared in the same manner as in Example 1, except that the second resin (J) was used. The layer separation phenomenon was observed in the specimen, which included a second resin layer having a thickness of 61 m and an interface layer having a thickness of 30 m, a pencil hardness of 1.5H, and an impact resistance of 8 kg*cm/cm in the case of IZOD and of 8 kg*cm/cm in the case of IZOD .

Comparative Example 1

(61) 100 parts by weight of the first resin pellet which is the same as in Example 1 was dried in an oven and injected at a temperature of 240 C. in a EC10030 injector (ENGEL) to manufacture a specimen 11 having a thickness of 3200 m.

(62) As a result of measuring physical properties of the specimen 11 thus manufactured, the specimen 11 had a glass transition temperature (Tg) of 70 C., an impact resistance of 10 kg*cm/cm in the case of IZOD and of 10 kg*cm/cm in the case of IZOD , and a pencil hardness of F.

Comparative Example 2

(63) A first resin was the same as in Example 1, and a second resin (K) was prepared in the same manner as in Example 1, except that 776 g of methyl methacrylate and 24 g of methacryloxypropyl terminated polydimethylsiloxane (Mw:420) were changed to 400 g of methyl methacrylate, and 400 g of methacryloxypropyl terminated polydimethylsiloxane (Mw:5000).

(64) The first resin and the second resin (K) had a surface energy difference of 25 mN/m, a melt viscosity difference of 600 pa*s, and the second resin (K) had a glass transition temperature of 50 C. The resin (K) had a weight average molecular weight of 100 K and a molecular weight distribution of 4.5, which were measured by GPC.

(2) Preparation of Resin Blend and Measurement of Physical Properties

(65) A specimen 12 was prepared in the same manner as in Example 1, except that the second resin (K) was used. The specimen peeled and thus a layer separation phenomenon could not be observed, and pencil hardness could not be measured. Further, a thickness of the second resin layer and a thickness of the interface layer could not be measured. The specimen had an impact resistance of 2 kg*cm/cm in the case of IZOD and of 1 kg*cm/cm in the case of IZOD .

Comparative Example 3

(66) A first resin was the same as in Example 1 and a second resin used polymethyl methacrylate (LGMMA IF870). The first resin and the second resin had no surface energy difference, a melt viscosity difference of 270 pa*s, and the second resin had a glass transition temperature of 104 C. The second resin had a weight average molecular weight of 73K and a molecular weight distribution (PDI) of 1.9, which were measured by GPC.

(2) Preparation of Resin Blend and Measurement of Physical Properties

(67) A specimen 13 was prepared in the same manner as Example 1 except that the polymethyl methacrylate was used. The specimen showed no layer separation phenomenon. Therefore, a thickness of the second resin layer and a thickness of the interface layer could not be measured. The specimen had a pencil harness of H, and an impact resistance of 5.2 kg*cm/cm in the case of IZOD and of 4.9 kg*cm/cm in the case of IZOD .

Comparative Example 4

(68) 100 parts by weight of the first resin pellet which is the same as in Example 1 was dried in an oven and injected at a temperature of 240 C. in a EC10030 injector (ENGEL) to manufacture a specimen.

(69) A self-manufactured pollution-resistant hard coating liquid containing polyfunctional acrylate (17.5 wt % of dipentaerythritol hexylacrylate (DPHA), 10 wt % of pentaerythritol triacrylate (PETA), 1.5 wt % of perfluorohexylethyl methacrylate, 5 wt % of urethane acrylate (EB 1290, SK cytech co., Ltd.), 45 wt % of methyl ethyl ketone, 20 wt % of isopropyl alcohol, 1 wt % of a UV initiator (IRGACURE 184, manufactured by Ciba corporation)) was coated on the specimen with Mayer bar #9 and dried for about 4 minutes in a range of 60 to 90 C. to form a film. Subsequently, the liquid composition coating was cured by UV irradiation at an intensity of 3,000 mJ/cm.sup.2 to form a hard coating film.

(70) The hard coating film had a pencil hardness of 3H, and peak intensity ratio [IBD(CC)/IA(CO)] and peak intensity ratio [IBD(out-of-plane)/IA(CO)] measured by an infrared spectrometer had an average value of 0 and a standard deviation of 0.