baber/WOPTO huggingface dataset:
Patent KR-20040038146-A (KR)
Title: Method for forming metal line in semiconductor device
Inventor: CHO YEONG A
IPC: H01L21/20
Filed: 2002-10-31
Abstract: PURPOSE: A method for forming metal lines of a semiconductor device is provided to be capable of reducing resistance and improving EM(Electro Migration) reliability. CONSTITUTION: An insulating layer(11) with a contact(12) is formed on a semiconductor substrate(10). An aluminum film(14a) with sufficient thickness is formed on the insulating layer. The first native oxide layer is formed on the aluminum film by annealing. The aluminum film is polished to have desired thickness by using the first native oxide layer as a buffer layer. Then, the second native oxide layer(16) is formed on the resultant structure. An anti-reflective coating layer(17) is then formed on the second native oxide layer.
Patent KR-20040039636-A (KR)
Title: System and Method for managing address of terminal
Inventor: JIN YONG SEOK
IPC: H04L12/24
Filed: 2002-11-04
Abstract: PURPOSE: A method and a system for managing the addresses of a terminal is provided to manage the ARP table of a terminal and to update the ARP table, when an address disappears, so that the terminal can catch the address of a server or another terminal using the ARP table. CONSTITUTION: Each network switch(200a,200b) contains an ARP table to monitor an IP address which can be matched with a MAC address in a MAC table. The MAC table includes terminals and MAC addresses, and the ARP table includes terminals, IP addresses, and MAC addresses. Accordingly, if a node is removed from a port of a network switch, the network switch arranges the MAC table and ARP table of the port. If a node is connected to an idle port, the network switch sends an address request message to the idle port, receives an address response message from a relevant terminal, and stores it in the MAC and ARP tables. Then the network switch transmits the stored ARP table information to the connected terminal and updates the ARP table of the terminal. In case that the first terminal(210a) wants to communicate with the second terminal(210b), the first terminal(210a) extracts the IP address of the second terminal(210b) from its own ARP table. Then the first terminal(210a) executes communication with the second terminal(210b) using the extracted IP address.
Patent KR-20040040084-A (KR)
Title: Winder for string
Inventor: KIM YONG TAEK
IPC: B21C47/00
Filed: 2002-11-06
Abstract: PURPOSE: A down coiler for wire rod is provided which is capable of coiling a wire rod that is a coiling object on a bobbin uniformly and stably by subtly controlling rotation speed of a bobbin holder correspondingly to tension variation of the wire rod. CONSTITUTION: In a down coiler for wire rod comprising a driving disk(30) in which a plural magnets(31) are laid with being spaced apart from each other in an equal circumferential distance, and which is installed at a driving motor(20) positioned with being spaced apart from one side of base frame(10) in a certain distance; an interlocking disk(50) which is installed at an end of bobbin holder(40) and interlockingly connected to the driving disk by magnetic force with being oppositely spaced apart from the driving disk in a gap, wherein the bobbin holder is rotationally installed by passing through the base frame from the other side to one side of the base frame toward the driving disk; and a tension control member(60) rotationally installed by penetrating the base frame from the front side adjacent to the bobbin holder, the down coiler for wire rod is characterized in that an operating member(70) is connected to free end of one side of the tension control member so that the operating member is directed to the gap between the driving disk and the interlocking disk, and a magnetic force control member(80) is attached to an end part of the operating member so that the magnetic force control member goes in and out the gap between the driving disk and the interlocking disk.
Patent KR-20040041296-A (KR)
Title: Shaping device of gloves
Inventor: PARK HYE SUK
IPC: D06F73/00
Filed: 2002-11-09
Abstract: PURPOSE: A glove setting device is provided to improve the quality, the appearance and comfortableness by ironing various gloves regularly with setting temperature according to the kind of gloves, and to increase the productivity by minimizing the failure rate. CONSTITUTION: A glove setting device is composed of plural heating members(30) formed of finger type to iron by heating the creases and sewing portions of the glove manufactured by cutting and sewing the raw material, and a body part(20) embedding an electric heater. One portion of the upper part of the heating member is inclined to the other portion of the lower part, and the angle between one portion of the upper part of the heating member and the other portion of the lower part is 15 - 17 angular degrees. An uneven assembling groove(22) is formed in the end of the body part, and an assembling projection(32) is formed in the lower part of the heating member corresponding to the assembling groove.
Patent KR-20040043080-A (KR)
Inventor: CHOI GYU SANG
IPC: B60N3/02
Filed: 2002-11-15
Abstract: PURPOSE: A handle device of a bus is provided to stabilize the postures of standing passengers, prevent accidents, and improve riding comfort by compensating inertia force by moving reverse a supporting bar by interlocking with the braking of the bus and moving backward a handle body to the reverse of the supporting bar. CONSTITUTION: A handle device of a bus is composed of a supporting bar(1) mounted with a handle body(5) and supported to a bracket(13) fixed to the ceiling to slide back and forth; a hydraulic mechanism(6) installed to the front of the supporting bar and operated by a hydraulic generating source of a brake system; and a returning device(12) installed to the rear side of the supporting bar. The hydraulic mechanism includes a cylinder(7) fixed to the ceiling and a piston(8) formed to the supporting bar. The returning device comprises a housing(14) fixed to the ceiling and inserted with the rear end of the supporting bar and a coil spring(15) embedded in the housing. The handle body is installed to the supporting bar by a band(4). The piston is integrated to the supporting bar.
Patent KR-20040043305-A (KR)
Title: Aluminum coating system for stainless steel plate and method for coating thereof
Inventor: JUNG JANG SEOP
IPC: C23C2/02
Filed: 2002-11-18
Abstract: PURPOSE: An apparatus and method for plating aluminum on stainless steel sheet are provided to suppress formation of chromium oxide and silicon oxide to the maximum during heat treatment by heat treating stainless steel sheet by indirect heating method. CONSTITUTION: The apparatus comprises a preheating furnace(10) comprising an introduction port(12a) for introducing the stainless steel sheet (S), and a preheating chamber(12) for receiving the introduced stainless steel sheet so that the received stainless steel sheet is preheated at a reduction gas atmosphere by indirect heating; first annealing furnace(20) comprising first annealing chamber(22) connected to the preheating chamber of the preheating furnace so that the stainless steel sheet introduced into the first annealing chamber is annealed at a reduction gas atmosphere by indirect heating; second annealing furnace(30) comprising second annealing chamber(32) connected to the first annealing chamber of the first annealing furnace so that the stainless steel sheet introduced into the second annealing chamber is annealed at a reduction gas atmosphere by indirect heating; a cooling furnace(60) comprising a cooling chamber(62) connected to the second annealing chamber of the second annealing furnace so that the stainless steel sheet introduced into the cooling chamber is cooled to a plating bath temperature or more at a reduction gas atmosphere; a soaking pit(70) comprising a heating chamber(72) connected to the cooling chamber of the cooling furnace so that the stainless steel sheet introduced into the heating chamber is reheated to a plating bath temperature or more at a reduction gas atmosphere; a discharge pipe(80) for discharging the stainless steel sheet reheated in the soaking pit; and a molten aluminum plating bath(90) in which molten aluminum is contained so that the stainless steel sheet discharged from the discharge pipe is bathed with molten aluminum.
Patent KR-20030004183-A (KR)
Title: GaN single crystal and its manufacturing method and its growing apparatus
Inventor: CHO CHAE RYONG
IPC: C30B29/38
Filed: 2002-11-18
Abstract: PURPOSE: An apparatus and a method for manufacturing GaN single crystal by supply of active nitrogen gas are provided to grow large single crystal by continuously supplying active nitrogen gas generated by decomposing NaN3 received in a subsidiary crucible to a growth crucible, and GaN single crystal grown by the method is provided. CONSTITUTION: The apparatus for manufacturing GaN single crystal by supply of active nitrogen gas comprises a growth crucible(120) in which a mixture of NaN3 and gallium (Ga) is sealingly received; a quartz tube(180) which is formed in such a way that the quartz tube encircles the outer surface of the growth crucible; a first vertical heat treatment furnace(100) in which the quartz tube enveloping the outer surface of the growth crucible is installed and connected to the external power source to be heated, and which shows a temperature gradient; a second vertical heat treatment furnace(110) in which a subsidiary crucible(130) sealingly containing NaN3 is positioned, and which is connected to the external power source to be heated; a connection pipe(140) for reciprocally connecting between the growth crucible received in the first vertical heat treatment furnace and the inner part of the subsidiary crucible received in the second vertical heat treatment furnace; and a vacuum valve(170) that is installed on the connection pipe.
Patent KR-20040043464-A (KR)
Title: Lower crush pad structure
Inventor: HONG CHANG BONG
IPC: B60R21/02
Filed: 2002-11-18
Abstract: PURPOSE: A structure of a crash pad attached to the lower part of a driver seat is provided to reduce the injury of a driver by moving the crash pad down when a shock is applied to the crash pad. CONSTITUTION: A slot(110) is vertically formed at the upper part of a crash pad(100). A stopper is formed at the lower part of the slot, and supports a screw(300). The screw is inserted between the lower end of the slot and the stopper, and is coupled to a fixing bracket. The crash pad moves down along the slot when the stopper is broken by the shock applied to the crash pad.
Patent KR-20040045148-A (KR)
Title: Extended Release Formulation of Tamsulosin or Pharmaceutically Acceptable Salt for Treating Evacuatory Insufficiency
Inventor: HWANG SEONG JU
IPC: A61K31/138
Filed: 2002-11-22
Abstract: PURPOSE: Provided is a sustained-release drug for the treatment of urination disorder which contains tamsulosin or pharmaceutically acceptable salts thereof as an active ingredient. It contains a sustained-release solid dispersant easily manufactured by the spray-drying method and the solid dispersant is coasted and granulated to control the early release thereof accurately. CONSTITUTION: A sustained-release drug for the treatment of urination disorder is characterized by containing: tamsulosin or its pharmaceutically acceptable salts; and single or mixture of acrylate copolymers and cellulose derivatives, and poloxamers in a ratio of 10:1-3.
Patent KR-20040044062-A (KR)
Title: Preparation of porous oystershells powder using sonication and low concentration acid
Inventor: JUN GEUM HA
IPC: C05D3/00
Filed: 2002-11-20
Abstract: PURPOSE: Provided is a production method of oyster shell powder with high porosity and large surface area by using ultrasonic waves and acids of low concentration. The resultant shell powder is applied to flocculant, microbe-multiplier, fertilizer, etc. CONSTITUTION: The oyster shell powder is produced by the following steps of: washing and grinding oyster shell powder a size of cymes or less; firing shell powder at 300-500deg.C; adding 1-5wt.%(based on the shell powder) of H2SO4 or H2O2 and mixing the solution for 12hrs; applying high frequency ultrasonic wave(55-65MHz) to the solution; drying the activated shell solution over 100deg.C; washing dried powder with water; and drying.
Patent KR-20040046857-A (KR)
Title: Gas immersed termination for cv cable system
Inventor: KANG CHAE HONG
IPC: H02G15/02
Filed: 2002-11-28
Abstract: PURPOSE: A gas immersed sealing end is provided to simplify the configuration of the sealing end and allow for ease of assembly by using an integrated type rubber molding member rather than a composite insulation reinforcement member. CONSTITUTION: A gas immersed sealing end comprises an insulating unit including a semiconductive shield(22) disposed at the lower side surface of a cable(24) and coupled to the top of a flange(28); a semiconductive upper shield(21) for covering a conductor lead rod(25); and a rubber molding member(20) integrated with a rubber insulating portion(23) for covering certain parts of the upper shield and the semiconductive shield. The rubber molding member is made of an EPDM or a silicon rubber material.
Patent KR-20040046859-A (KR)
Title: Dual mode digital signal processing appparatus for using pip
Inventor: LEE YONG HYEON
IPC: H04N5/45
Filed: 2002-11-28
Abstract: PURPOSE: A dual mode signal processor using PIP(Picture-In-Picture) is provided to simultaneously display two pictures of digital signal processors that execute different functions using PIP. CONSTITUTION: A dual mode signal processor using PIP includes the first signal processor(100) for a digital still camera, the second signal processor(200) for a digital video camera, the first and second signal switches(410,420), a PIP block(300), a display(500), a function key input unit(440), and a controller(450). The first and second signal processors respectively process digital signals of the digital still camera and digital video camera and output processed signals to the PIP block. The first signal switch selects YUV signals for a main picture, output from the first and second signal processor, and outputs the YUV signals to the PIP block. The second signal switch selects composite video signals for a sub-picture, output from the first and second signal processors, and outputs the composite video signals to the PIP block. The controller outputs a control signal(451) for controlling the first signal switch and a control signal(452) for switching the second signal switch.
Patent KR-20040047403-A (KR)
Title: Dividable wireless device for voice communication
Inventor: EOM JANG PIL
IPC: H04B1/40
Filed: 2002-11-30
Abstract: PURPOSE: A voice call terminal separation-type wireless communication terminal device is provided to separate a wireless data communication terminal body from a voice call terminal, and to wirelessly connect the wireless data communication terminal body with the voice call terminal, thereby performing wireless communication with the terminal body by using minimal parts. CONSTITUTION: A wireless data communication terminal body(100) comprises as follows. An RF module 1(110) is accessible to a wireless communication network like a CDMA kit. A controller(120) controls the wireless data communication terminal body(100), and controls wireless communication with a voice call terminal. A PC port(130) is connected to a PC(400). An RF module 2(140) enables wireless communication with the voice call terminal. A memory 1(150) stores software for a voice call. A memory 2(160) drives the software for the voice call.
Patent KR-20040061360-A (KR)
Inventor: KIM SEOK HUI
IPC: F24C15/08
Filed: 2002-12-30
Abstract: PURPOSE: A leg structure of a microwave oven is provided to prevent the microwave oven from moving from a place where the microwave oven is installed. CONSTITUTION: A leg structure of a microwave oven comprises a leg part(31) installed to the bottom of the microwave oven, and a cover part(33) fixed to the lower end of the leg part and arranged in close contact with the bottom surface where the microwave oven is installed. The leg part secures a space to the lower side of the microwave oven. The cover part is made of a material having relatively great friction force than the friction force of the material of the leg part.
Patent KR-20020016650-A (KR)
Title: 전화 회의 및 인터콤을 위한 유선 전화 및 무선 전화의결합 방법 및 장치
IPC: H04Q3/58
Filed: 2000-07-26
Abstract: 본 발명에 따르면, 인터콤 및 회의 기능을 수행하기 위해, 유선 전화 핸드셋 및 무선 전화 핸드셋을 아날로그 네트워크 회선 또는 디지털 네트워크 중 어느 하나와 결합시키는 방법 및 장치가 제공된다.  구체적으로 말하면, 본 발명의 장치는 각각의 아날로그 네트워크 회선 또는 디지털 네트워크로부터의 디지털 네트워크 회선에 연결된 네트워크 인터페이스와, 각각의 유선 전화 핸드셋에 연결되어 있는 아날로그 변환기와, 각각의 무선 전화 핸드셋에 연결되어 있는 디지털 변환기와, 네트워크 인터페이스, 아날로그 변환기 및 디지털 변환기에 연결되어 있는 신호 처리 회로와,  네트워크 인터페이스 또는 인터페이스 회로, 아날로그 변환기, 디지털 변환기 및 신호 처리 회로에 연결되어 있는 제어기를 포함한다.  동작에 있어서는, 신호 처리 회로는 네트워크 인터페이스, 아날로그 변환기 및 디지털 변환기로부터 시분할 다중화된 방식으로 신호를 수신하여 출력 신호들을 발생하고, 이 출력 신호들은 아날로그 변환기, 디지털 변환기 및 네트워크 인터페이스로 보내져 재변환되어, 각각의 유선 전화 핸드셋, 무선 전화 핸드셋 및 아날로그/디지털 네트워크 회선으로 보내진다.
Patent KR-20020024331-A (KR)
IPC: H04W74/06
Filed: 2001-06-18
Abstract: 통신 시스템은 와이어리스 메시지 송신을 할 수 있는 적어도 하나의 비컨 디바이스(12, 14)와 그러한 메시지 송신을 수신할 수 있는 적어도 하나의 휴대용 디바이스(10)를 포함한다. 비컨 디바이스(12)는 일련의 조회 메시지(60)를 방송할 수 있도록 배열되는데, 각 조회 메시지는 블루투스와 같은 첫 번째 통신 프로토콜에 따라 배열된 미리 결정된 복수의 데이터 필드(INQ)의 형태로 되어 있다. 방송을 통해 추가적 데이터를 전송하기 위해, 비컨 디바이스(12)는 송신 전에 각 조회 메시지에 방송 데이터를 운송하는 추가적 데이터 필드(BCD)를 추가하며, 휴대용 디바이스(10)는 송신된 조회 메시지를 수신하며 추가적 데이터 필드로부터 방송 데이터를 판독한다.
Patent KR-20020039694-A (KR)
IPC: H04L12/58
Filed: 2000-10-17
Abstract: 인스턴트 메시징에 광고 또는 뉴스 그 밖의 정보배송기능을 가지게 한 정보배송장치로서, 단말군(20A)의 가입자로부터의 접속요구에 관한 초기신호(31)가 메인 서버(11)에 보내지면, 메인 서버(11)는 단말군(20A)이 현재 사용중인 IP어드레스정보를 단말군(20B)에 보내고, 이후 양 단말군(20A,20B) 사이에서는, 메시지신호 (32)에 의해서 직접 메시지를 주고 받는다.  이 때, 메인 서버(11)는 단말군 (20A ,20B)의 가입자의 속성을 해석하여, 내부에 축적된 광고중에서 적절한 것을 각 단말군(20A,20B)에 배송한다.
Patent KR-20020047273-A (KR)
Title: Sensing device with interchangeable nibs
IPC: G06T11/80
Filed: 2000-10-20
Abstract: A system is provided for enabling personal editorial and advertising content delivery. The system has a publication server which receives information regarding interests of a user and selects editorial content in accordance with the information. The publication server also receives information regarding a locality and demographic of the user and selects advertising content in accordance with the information and the published editorial content. Further, the publication server publishes a personalised publication with the selected editorial and advertising content.
Patent KR-20020076232-A (KR)
Title: High refractive index thermoplastic polyphosphonates
IPC: G02B1/04
Filed: 2000-11-10
Abstract: High refractive index, melt processable polyphosphonates and methods for preparing the same are provided. These polymers are particularly useful for optical and ophthalmic parts, such as lenses. A method of preparing optical and ophthalmic lenses by injection molding the polymers of the present invention into the form of the optical or ophthalmic lenses is also provided.
Patent KR-20020059818-A (KR)
IPC: C08J5/18
Filed: 2000-11-15
Abstract: 본 발명은 락탐 (I), 디아민 (II) 및 디카르복실산 (III)을 기재로 한 코폴리아미드의 연속 제조 방법에 관한 것이다.  본 발명의 방법은 디아민 (II), 디카르복실산 (III) 및 물을 함유하는 혼합물 (IV)를 반응 구역의 도입부의 압력이 1.3×10 5 내지 2.5×10 5 Pa이고, 온도가 중합체 (V)의 융점 이상인 제1 반응 구역에서 디아민 (II) 및 디카르복실산 (III)의 몰량에 대하여 80 ％ 이상의 전환율로 중합체로 전환시키고, 락탐 (I) 및 물을 함유하는 혼합물 (VI)을 압력이 5 ×10 5 내지 40×10 5 Pa이고, 온도가 중합체 (VII)의 융점 이상인 제2 반응 구역에서 락탐 (I)의 몰량에 대하여 80 ％ 이상의 전환율로 중합체 (VII)로 전환시킨 후, 중합체 (V) 및 중합체 (VII)를 반응 구역의 도입부의 압력이 1×10 5 내지 1.5×10 5 Pa이고, 온도가 중합체 (VIII)의 융점 이상인 제3 반응 구역에서 서로 반응시켜 중합체 (VIII)을 제조하는 것을 특징으로 한다.  중합체 (VIII)는 95 ℃의 물로 추출될 수 있는 구성 성분을 락탐 (I), 디아민 (II) 및 디카르복실산 (III)에 대하여 최대 10 중량％까지 함유한다.  그 후에, 중합체 (VIII)를 물로 추출하여 코폴리아미드를 수득한다.  또한, 본 발명은 상기 방법을 사용하여 수득되는 코폴리아미드, 및 상기 코폴리아미드를 기재로 한 섬유, 시트 구조물 및 성형체 제조를 위한 상기 코폴리아미드의 용도에 관한 것이다.
Patent KR-20020068365-A (KR)
IPC: H01L33/16
Filed: 2000-11-30
Abstract: 극성 방향으로 성장된 결정층(2-7)을 갖는 반도체 광방출기에서 자발적으로발생하는 분극 유발 전기장은 그 방출기의 동작 효율 및 캐리어 제한을 개선하기 위하여 줄어들거나, 삭제되거나, 반전된다. 이것은 인접한 결정층(2-7)의 재료 성분의 차이를 줄이고, 분극 유발 전하를 방해하는 공간 전하 및 준전계를 발생하기 위하여 하나 이상의 층들을 그레이딩하고, 분극 유발 전하들과 반대의 전하 상태로 이온화하는 다양한 불순물을 반도체에 포함하고, 대전된 원자층의 순서를 바꾸고, 그 디바이스에서 n형 및 p형층의 성장 순서를 바꾸고, 균일한 활성 영역 대신에 다층 방출 시스템을 적용하며, 그 재료의 평면내 격자 상수를 변경하는 것에 의해 수행된다.
Patent KR-20020082480-A (KR)
Title: 전기 제빙용 코팅 시스템 및 방법
IPC: H05B3/34
Filed: 2000-12-28
Abstract: 본 발명에 따른 물체에 부착된 얼음의 얼음 부착력을 수정하는 시스템은 보호되어야 할 표면을 덮고 있는 와이어 전극을 포함하는 합성 코팅을 포함한다.  일실시예에서, 합성 코팅은 전극 와이어와 절연 섬유를 포함한다.  합성 코팅은 얼음 부착력이 수정되어야 할 물체의 표면에 적용된다.  전극 와이어들은 직류 바이어스 전원에 연결되며, 그것들이 교번적으로 캐소드와 애노드로서 기능한다.  얼음이 애노드와 캐소드 와이어간의 회로를 완성할 때, 상기 전원은 상기 얼음과 상기 표면간의 계면에 직류 바이어스를 발생시킨다.  다른 실시예에서, 와이어 메시(mesh)가 물체의 전기전도성 표면에 배치되며, 상반된 직류 바이어스들이 메시 및 표면에 인가된다.  또 다른 실시예에서, 얼음으로부터 표면을 보하기 위하여 표면에 적용되는 합성 직물로서, 상기 코팅은 절연섬유에 의해 직조된 애노드 와이어와 캐소드 와이어를 가진다.
Patent KR-20030023854-A (KR)
IPC: C03C17/34
Filed: 2001-06-11
Abstract: 본 발명에서는 수산화티탄겔 (오르토티탄산) 에 과산화 수소를 작용시켜 얻어지는 과산화 티탄 용액에 광촉매체 입자를 분산시킨 코팅제를 사용하여 광촉매체 입자 (11) 를 담지시킨 광촉매막 (18) 을 형성한다.     그리고, 이 광촉매막 (18) 위에 다공질상 친수성 물질막 (12) 을 형성함으로써, 불식에 의해 광촉매막 (18) 의 막 표면이 손상되는 것을 방지할 수 있다.     또, 과산화 티탄 용액에 광촉매체 입자를 분산시킨 코팅제를 사용하여 상온 내지 200℃ 미만에서 형성한 막은, 보다 고온에서 형성한 막이나 광촉매체 입자를 분산시키지 않는 막에 비해 다공질이다.     따라서, 광촉매막 (18) 과 친수성 물질막 (12) 의 밀착성이 양호하다.
Patent KR-20020093819-A (KR)
IPC: B65D75/30
Filed: 2001-01-31
Abstract: 상부 스트립(3) 및 하부 스트립(2)을 포함하는 박편형 제품용 1차 팩이 개시되어 있다.  스트립(2, 3)의 융합은 박편형 제품을 수용하기에 적합한 내측 영역을 밀봉하며, 양쪽 포장 스트립이 서로 결합되지 않고 상기 스트립이 서로 일치되어 중첩되게 배치되지 않는 영역을 상기 스트립의 외측 영역에 포함한다.
Patent KR-20020077506-A (KR)
Title: Method for obtaining macroscopic fibres and strips from colloidal particles and in particular carbon nanotubes
IPC: D01F9/08
Filed: 2001-02-23
Abstract: The invention concerns a method for obtaining fibers and strips from colloidal particles, characterized in that it consists in: 1) dispersing said particles in a solvent optionally using a surfactant; 2) injecting the resulting dispersion solution through at least an orifice emerging into a flow of an external solution, preferably, having a higher viscosity than said dispersion, the viscosity levels being measured in the same temperature and pressure conditions, so as to cause said particles to agglomerate into fibers or strips by destabilizing the particle dispersions and optionally aligning said particles.
Patent KR-20020093820-A (KR)
IPC: C08L23/06
Filed: 2001-02-27
Abstract: The present invention generally relates to processes for preparing extruded foam products and more particularly to a process for producing such products wherein surface defects are minimized. There has been a movement to replace conventional halo-carbon blowing agents in favor of purportedly more environmentally safe halo-carbon free blowing agents such as carbon dioxide, nitrogen, argon, water, air, nitrogen, and helium. However, these halo-carbon free blowing agents, in particular carbon dioxide, have higher foaming rates and higher volatility leading to greater surface defects in the extruded foam. The present invention employs polyethylene wax to reduce or eliminate the occurrence of surface defects where halo-carbon free blowing agents are employed in an extruded foam manufacture process. The polyethylene wax containing extruded foam products of this invention are characterized by a generally smooth substantially defect free surface and contain a majority of closed cells which are free of any trapped halo-carbon blowing agents.</PTEXT>