Abstract:
Apparatus and method for the production of hopper feedable thermoplastic pellets having zones or compartments which contain physically separated reactants which react only after being melt-mixed, as in a screw type extruder, reciproscrew injection machine, or similar device which heat forms pellets into a larger mass. This new class of thermoplastic molding materials relies mainly on the relatively slow reaction kinetics of contained large molecule molding materials to provide a time interval after melt-mixing of zoned pelletized reactants in an extruder barrel or inflection molding machine. During this time period, the thermoplastic molding material is easily filled into injection molds. As the reaction progresses, the material becomes more viscous and such flow is difficult or impossible. The involved reactions may continue after demolding at room temperature during a post molding cure, or appliance service generated heat may cause post molding cure. Where a delayed reaction involves crosslinking and/or additional polymer molecular growth after molding, such crosslinking can bond adjacent molecules and reduce or prevent stress memory warpage of molded parts. Fibrous reinforcements may be included to aid in reducing post molding warpage. Foaming agents contained can, when molded by the Bradt Process, virtually eliminate weld lines in molded parts.
Abstract:
The present invention relates to a method for the continuous preparation of heat-vulcanizing silicone rubber compounds. The method comprises continuous feeding of (A) 100 weight parts polydiorganosiloxane gum, (B) 5 to 100 weight parts reinforcing filler, and (C) up to 30 weight parts processing aid to a co-rotating twin-screw continuous compounding extruder. The components (A), (B), and (C) are continuously mixed in the extruder at a temperature in a range of about 200.degree. C. to 300.degree. C. The mixed components are then discharged, forming an extrudate. The extrudate is fed continuously to a counter-rotating twin-screw continuous compounding extruder, wherein the extrudate is continuously heat-treated at a temperature in a range of 150.degree. C. to 300.degree. C., forming the silicone rubber compound, which is then discharged from the counter-rotating twin-screw continuous compounding extruder.
Abstract:
Method and apparatus for the post reaction treatment of resins produced by fluidized bed polymerization of alpha olefins wherein an extruder is coupled in communication with the reactor and all necessary devolatilization of monomer, deactivation of catalysts and addition of additives are performed in the extruder.
Abstract:
Manganomanganic oxide fume or a material containing manganomanganic oxide fume as its principle ingredient is used as a color pigment in the production of thermoplastic articles and particularly thermoplastic films.
Abstract:
A viscosity-stable composition comprising by weightA. about 20 to 100 parts of a linear polyorganosiloxane of the formula ##STR1## in which R is an optionally substituted hydrocarbon radical with up to 10 C atoms,R.sup.1 has any of the definitions of R and in addition can be an OH radical, andn is a positive integer,B. about 5 to 50 parts of a highly disperse active filler with a surface area of at least 50 m.sup.2 /g,C. about 1 to 5 parts of a modifying agent of the formula(R.sub.3 Si).sub.n Xin whichR is as defined above,X is halogen, OH, OR, S, OOCR, N or NY,Y is hydrogen or any of the definitions of R, andn is 1, 2 or 3, andD. about 0.1 to 10 parts of water (based on (a) + (b) + (c)),Is produced by treating the filler with the modifying agent, in the presence of water, during its incorporation into the polyorganosiloxane. The preferred filler is silica but may also comprise TiO.sub.2, Al.sub.2 O.sub.3, Fe.sub.2 O.sub.3 and/or ZnO. Other additives may also be included.
Abstract translation:包含重量百分比的粘度稳定组合物。约20至100份式(Ⅰ)的线性多聚硅氧烷的部分,其中R是具有至多10个C原子的任选取代的烃基,R 1具有R和 另外可以是OH基团,N是一个积极的整数,B.关于5到50个具有最低50 M2 / G,C表面积的高分散活性填料的部件。关于1到5部分的修改 式(R3Si)nX的化合物,其中R如上定义,X是卤素,OH,OR,S,OOCR,N或NY,Y是氢或R和N的任何定义IS 1,2或 3,和D.关于0.1至10份水(基于(A)+(B)+(C)),是通过用修改剂处理填料,在水中存在时,在其进入 聚硅氧烷 优选的填料是二氧化硅,但也可以包含TiO 2,Al 2 O 3,Fe 2 O 3和/或ZnO。 也可以包括其它添加剂。
Abstract:
Carbon black and liquid rubber are blended to form a dispersion by mixing 60 to 150 parts by weight of the carbon black with 100 parts by weight of the liquid rubber to form an initial dispersion of the carbon black in the liquid rubber and diluting the dispersion with additional liquid rubber to prepare a composition having the required carbon black content.
Abstract:
A low shear method of adequately dispersing carbon black in liquid elastomers by adding the liquid elastomers to a container, adding from 30 parts to about 160 parts by weight per 100 parts of liquid elastomer of an oil beaded carbon black containing from 5 to about 60 parts of oil and from 25 to about 100 parts of carbon black and mixing the compounds to produce a relatively low viscosity carbon black dispersed elastomeric composition.
Abstract:
A pigmented pulverulent composition based on polyamide for coating substrates, including: (a) 40% to 99% by weight of at least one polyamide, (b) 1% to 30% by weight of at least one pigment, and (c) 0% to 30% by weight of at least one additive, wherein the polyamide has an inherent viscosity, as measured using an Ubbelohde tube at 20° C. on a 0.5% by weight solution in m-cresol according to standard ISO 307 but with a measuring temperature of 20° C. rather than 25° C., of more than 0.7 (g/100 g)−1, and wherein the composition has a volume-median diameter Dv50, as measured according to standard ISO 9276—parts 1 to 6, of 10 to 200 μm. A process for manufacturing the composition, the use thereof for coating a—metallic—substrate, and an object comprising a metallic substrate coated with a coating obtained with the pigmented pulverulent composition based on polyamide.
Abstract:
The present disclosure relates to compositions containing a) at least one thermoplastic polymer, b) at least one small molecule organic salt, and c) at least one water-soluble or water-dispersible polymer, including processes for the use thereof for the production of polymer particles of sub-micron size.