Abstract:
A thermoplastic resin composition is provided to ensure excellent weatherability while maintaining heat resistance and impact strength of intrinsic resin. A thermoplastic resin composition with excellent weatherability comprises an acrylic graft-copolymer 20~60 parts by weight, diene graft-copolymer 0~20 parts by weight, and a copolymer 40~80 parts by weight of vinyl cyanide compound with average molecular weight of 80,000~400,000 and aromatic vinyl compound. The acrylic graft-copolymer is obtained by emulsion graft-polymerizing a monomer mixture 40~80 parts by weight consisting of a vinyl cyanide compound 30~35 weight% and an aromatic vinyl compound 70~65 weight% to an acrylic synthetic rubber 20~60 parts by weight.
Abstract:
Provided are an environment-friendly thermoplastic resin composition, which has low volatility and absorptiveness, generates a low amount of gas by pyrolysis, and is superior in an injection stay discoloring property, impact strength, and flowability, and a preparation thereof. The thermoplastic resin composition is prepared by the steps of: (i) adding ion-exchanged water and a reactive emulsifier to a butadiene rubber polymer in a reactor, thereto adding a monomer mixture of an aromatic vinyl monomer and a vinyl cyanide monomer, and a molecular weight controller, heating the admixture while stirring, thereto adding a cross-linking agent, a graft agent, an oil-soluble pyrolytic initiator when the temperature reaches 55-65°C, and starting polymerization to prepare a first graft ABS; and (ii) adding a water-soluble initiator in the presence of the first graft ABS to stir the admixture, adding the monomer mixture and the molecular weight controller for 2-5 hours, and performing a second graft reaction to prepare a graft acrylonitrile-butadiene-styrene copolymer.
Abstract:
The present invention provides a method of preparing a graft copolymer with a high rubber content showing good mechanical properties, which comprises (i) a first step of preparing a first graft copolymer latex by graft-polymerizing a monomer mixture of styrene and acrylonitrile onto a rubber polymer using an oil-soluble initiator; and (ii) a second step of preparing a second graft copolymer latex by reacting said first graft copolymer latex using a redox catalyst system and an initiator and adding continuously a monomer mixture of styrene and acrylonitrile, a molecular weight controlling agent and an initiator over 2-6 hours.
Abstract:
PURPOSE: A process for preparing a SAN(acrylonitrile-butadiene-styrene) graft copolymer of core-shell structure having excellent appearance and whiteness and high rubber content is provided. CONSTITUTION: The process for preparing a SAN graft copolymer comprises the steps of: introducing ion exchanged water into which a water soluble initiator is dissolved, and an emulsifier into a polybutadiene elastomeric polymer having an average particle diameter of 0.28 to 0.33 micrometers and gel content of 75 to 85 wt%; heating the mixture to 55 to 65 deg.C in order to swell the water soluble initiator into the elastomeric polymer and in order to decompose to form a radical gradually; introducing continuously an aromatic vinyl compound and an unsaturated nitrile compound which are the monomers to be grafted onto the elastomeric polymer, an emulsifier and a molecular weight modifier; heating the mixture to the final temperature of 75 to 85 deg.C and terminating the polymerization when the conversion is 95 to 98% and solid content is 40 to 44 wt% to obtain a SAN graft copolymer latex; and then introducing a solidifying agent consisting of an aqueous acid solution and aqueous salt solution to solidify the SAN graft copolymer resin.
Abstract:
PURPOSE: Provided is a method for preparing a novel graft copolymer having high rubber content and improved natural color, as well as excellent in impact resistance and fluidity. CONSTITUTION: The method comprises the steps of (i) mixing 10-30 wt% of graft monomer mixture with fat-soluble thermal decomposition initiator with stirring, introducing the mixture into rubbery polymer, introducing molecular weight controlling agent and ion exchange water, elevating the temperature with stirring, and continuously stirring within 10 minutes when the temperature reaches 55-65 deg.C to swell most of the introduced graft monomer and polymerization initiator into rubber particles, and introducing an emulsifier and elevating a temperature of reactor to initiate a polymerization, thereby the first copolymer latex being produced; and (ii) introducing redox based catalyst mixture and polymerization initiator in a reactor in the presence of the first graft copolymer latex, stirring the mixture for 5-10 minutes, mixing 90-70 wt% of residual graft monomer mixture and molecular weight controlling agent with stirring, and continuously introducing the latter mixture over 2-5 hours and polymerization initiator at the same time for 2-5 hours to graft react the trace graft monomer and the polymerization initiator, thereby the second copolymer latex being produced.
Abstract:
PURPOSE: A method for preparing a thermoplastic resin having good high impact property and natural color is provided to obtain a thermoplastic resin that maintains excellent gloss and flow property of ABS resin and has improved high impact property and natural color. CONSTITUTION: A method for preparing a thermoplastic resin having good high impact property and natural color according to the present invention comprises mixing and processing a graft copolymer and SAN resin to obtain a thermoplastic resin wherein the method is characterized by comprising the steps: a) first graft reacting step wherein 40 to 60 parts by weight of rubber latex which has average particle diameter of graft copolymer between 0.25 and 0.34 micrometer and 70 to 90% of gel content is copolymerized with 60 to 40 parts by weight of graft monomer mixture comprising styrene and acrylonitrile in the presence of a liposoluble initiator inside the rubber; and b) second graft copolymerizing step wherein the said graft reacted copolymer envelops the surfaces of rubber particles in the presence of a water-soluble pyrolysis initiator.
Abstract:
PURPOSE: A flame retardant thermoplastic resin composition is provided to ensure excellent impact resistance by chlorinated polyethylene within an acrylonitrile-chlorinated polyethylene-styrene resin and high compatibility with brominated diphenylethanes and acrylonitrile-butadiene-styrene-based resins. CONSTITUTION: A flame retardant thermoplastic resin composition comprises 100 parts by weight of a base resin and 5-40 parts by weight of a brominated diphenylethanes mixture. The base resin includes 50~90 weight% of an acrylonitrile-butadiene-styrene resin and 5~40 weight% of an acrylonitrile-chlorinated polyethylene-styrene resin. The composition includes 1-6 parts by weight of antimony trioxide based on 100 parts by weight of a base resin. The acrylonitrile-butadiene-styrene resin comprises 10~20 parts by weight of a diene-based rubber, 40~60 parts by weight of a vinyl aromatic compound, and 20~30 parts by weight of a vinyl cyanide compound.
Abstract:
PURPOSE: A thermoplastic resin composition is provided to ensure excellent weather resistance and low gloss property and to avoid the deterioration of impact resistance and fluidity. CONSTITUTION: A low gloss thermoplastic resin composition includes (A) 30~80 weight% of an acrylic grafted copolymer resin in which the rubber particle diameter is 0.3~0.8 micron and (B) 20~70 weight% of an aromatic vinyl-cyanide vinyl copolymer resin. In the acrylic grafted copolymer resin, 40~70 weight% of the aromatic vinyl-cyanide vinyl copolymer is graft-polymerized with 30~60 weight% of acrylic rubbers. The vinyl cyanide monomer is selected from the group consisting of acrylonitrile, methacrylonitrile, ethacrylonitrile and a mixture thereof.
Abstract:
A high weather resistant and heat-resistant thermoplastic resin composition is provide to improve injection stability and colorability, and to maintain the properties like weather resistance and impact strength by adding a maleimide heat-resistant resin to a blend consisting of an acryl graft-copolymer, a diene graft-copolymer, and vinyl cyanide-aromatic vinyl-heat resistant alpha-methylstyrene ter-polymer. A high weather resistant and heat-resistant thermoplastic resin composition comprises (A) an acrylic graft copolymer 20-50 weight% which is grafted with a monomer mixture consisting of an aromatic vinyl compound and a vinyl cyanide compound to the acrylic rubber; (B) a diene-based graft copolymer 5-10 weight% which is grafted with a monomer mixture consisting of an aromatic vinyl compound and a vinyl cyanide compound to the diene-based rubber; (C) vinyl cyanide-aromatic vinyl copolymer 20-50 weight%; (D) an alpha-methyl styrene-based compound 10-20 weight% which is a terpolymer copolymerized with an aromatic vinyl compound, a vinyl cyanide compound and an alpha-methyl styrene compound; and (E) a copolymer 5-10 weight% of an N-substituted maleimide compound and an aromatic vinyl compound.
Abstract:
본 발명에 따른 열가소성 수지 조성물의 제조 방법은 (ⅰ) 부타디엔계 고무질 중합체에 이온교환수 및 반응성 유화제를 반응기에 투입하고, 방향족비닐 단량체와 시안화비닐 단량체로 이루어진 단량체 혼합물과 분자량 조절제를 넣고 교반하면서 승온하여 55∼65℃에 이르면 가교제, 그라프트제 및 지용성 열분해 개시제를 첨가하여 중합을 개시하여 1차 그라프트 ABS를 제조하고; 그리고 (ⅱ) 상기 1차 그라프트 ABS의 존재 하에 수용성 개시제를 투입하여 교반한 다음 상기 단량체 혼합물 및 분자량 조절제를 2∼5 시간에 걸쳐 투입하여 2차 그라프트 반응을 하여 그라프트 아크릴로니트릴-부타디엔-스티렌(g-ABS) 공중합체를 제조하는 단계를 포함하여 이루어진다. 열가소성 수지, 그라프트 ABS, 반응성 유화제, 유화중합, 저휘발성, 사출체류 변색성,