摘要:
The invention relates to a method for preparing an aqueous dispersion of a copolymer comprising polymerized comonomers vinyl ester and ethylene, characterized in that ethylene and the vinyl ester are charged in multiple steps, where the initial charge ratio of ethylene to the vinyl ester is 0.2 to 0.6:1; and the vinyl ester is copolymerized with ethylene in the presence of a) anionic surfactant 1, which has the following chemical formula: C n H 2n+1 O-EO x -PO y -Q (I), where n is an integer between 6 and 44, inclusive; x is an integer between 0 and 11, inclusive; y is an integer between 0 and 11, inclusive; at least one of x and y is non-zero; and Q is any one selected from among sulphate, sulfonate, carboxylate and phosphate salts.
摘要:
The invention relates to a method for producing diene-vinylaromatic copolymer rubbers modified with a polar comonomer, by emulsion copolymerization of conjugated dienes, vinylaromatic monomers, and polar comonomers in the presence of a radical initiator, a molecular-weight regulator, and an emulsifying agent, followed by the separation of a rubber from latex. In the method provided by the invention an antioxidant is added to the vinylaromatic monomer to be polymerized, in the form of a sterically hindered phenol in an amount of from 0.2 to 0.6 wt.%, and vinyl derivatives modified with polar groups of various classes are used as the modifying polar comonomer, wherein the polar monomer is added batchwise during the process: a first portion in an amount of 0.5 to 1.0 weight part is added together with hydrocarbon charge, and a second portion and a third portion are added in an amount of 0.5 to 2.5 weight part at monomer conversions of from 30 to 40 and from 50 to 60%, respectively. The method provided by the invention may be used in the synthetic rubber production and tire industry and allows for reduction of power consumption during production of rubbers having improved physical and mechanical properties in vulcanizates thereof.
摘要:
Liquid polymer compositions comprising: one or more hydrophobic liquids having a boiling point at least about 100 °C; at least about 39% by weight of one or more acrylamide-(co)polymers; one or more emulsifier surfactants; and one or more inverting surfactants; wherein, when the composition is inverted in an aqueous solution, it provides an inverted solution having a filter ratio using a 1.2 micron filter (FR1.2) of about 1.5 or less.
摘要:
본 발명은 본 발명은 대구경의 디엔계 고무 라텍스 제조 방법과 이를 포함하는 아크릴로니트릴-부타디엔-스티렌 그라프트 공중합체에 관한 것으로, 대구경 고무 라텍스 제조 시에 가교제와 임계미셀농도(critical micelle concentration, CMC)가 150 mg/L 이하인 유화제의 함량 및 투입 시점을 조절함으로써 충격 강도가 향상된 대구경의 디엔계 고무 라텍스를 제조하는 방법과, 이로부터 제조된 대구경의 디엔계 고무 라텍스 및 이를 포함하는 아크릴로니트릴-부타디엔-스티렌 그라프트 공중합체와 이를 포함하는 열가소성 수지에 관한 것이다.
摘要:
There is provided an aqueous emulsion derived from a blend comprising an acrylic polymer, wherein the pH of the dispersion medium is less than 7.0, and a water-in-oil emulsion containing a nonionic water-soluble polymer, which aqueous emulsion has viscosity of 1,000 to 15,000 mPa s at 25 °C. There are also provided adhesive compositions made using the aqueous emulsion and methods for manufacturing the aqueous emulsion.