摘要:
Rubber particles, to be used as fillers or extenders for various composite polymer systems, are chlorinated by a gas-solid phase reaction with a chlorine-containing gas. A composite polymer containing the chlorinated rubber fillers or extenders exhibits a higher flexural modulus than if prepared using an unchlorinated rubber filler or extender. Chlorination of the rubber particles is carried out by contacting the finely divided rubber particles with a chlorine-containing gas comprising at least about 5 volume percent chlorine. Advantageously, the chlorine can be diluted with air, nitrogen or other essentially inert gases and may contain minor amounts of fluorine. Improved performance is obtained with nitrogen dilution of the chlorine gas over air dilution. Improved polymer composite systems having higher flexural modulus result from the use of the chlorinated rubber particles as fillers instead of unchlorinated rubber particles.
摘要:
Rubber particles, to be used as fillers or extenders for various composite polymer systems, are chlorinated by a gas-solid phase reaction with a chlorine-containing gas. A composite polymer containing the chlorinated rubber fillers or extenders exhibits a higher flexural modulus than if prepared using an unchlorinated rubber filler or extender. Chlorination of the rubber particles is carried out by contacting the finely divided rubber particles with a chlorine-containing gas comprising at least about 5 volume percent chlorine. Advantageously, the chlorine can be diluted with air, nitrogen or other essentially inert gases and may contain minor amounts of fluorine. Improved performance is obtained with nitrogen dilution of the chlorine gas over air dilution. Improved polymer composite systems having higher flexural modulus result from the use of the chlorinated rubber particles as fillers instead of unchlorinated rubber particles.
摘要:
A plastic article having a number of surfaces with at least one surface being modified by contacting that surface with a reactive gas atmosphere containing F.sub.2, Cl.sub.2, O.sub.2, Ozone, SO.sub.3, oxidative acids, or mixtures thereof, at a temperature and gas partial pressure sufficient to increase the surface energy of the at least one surface being modified to at least 40 dynes/cm at a temperature of 20.degree. C., to enhance bonding of non-slip polymer coatings to the modified surface, to which coatings elastomeric or rigid particles may be admixed for imparting a surface profile and increasing the coefficient of friction between the coated surface and the counter-surface.
摘要:
The present invention is a process for making shaped articles by injecting a thermoplastic or thermoset polymer into a mold cavity in which is maintained at atmosphere containing between 0.1 mole % and 50 mole % F.sub.2 and at least 20 ppm O.sub.2 while said polymer is being injected into the mold. The process results in shaped articles having altered physical and chemical characteristics. A weld line formed where two interfaces of the polymer are joined in the mold cavity serves as a clean break point when pressure is applied to an article formed by the process. The atmosphere in the mold cavity may contain SO.sub.3.
摘要:
Rubber particles, to be used as fillers or extenders for various composite polymer systems, are chlorinated by a gas-solid phase reaction with a chlorine-containing gas. A composite polymer containing the chlorinated rubber fillers or extenders exhibits a higher flexural modulus than if prepared using an unchlorinated rubber filler or extender. Chlorination of the rubber particles is carried out by contacting the finely divided rubber particles with a chlorine-containing gas comprising at least about 5 volume percent chlorine. Advantageously, the chlorine can be diluted with air, nitrogen or other essentially inert gases and may contain minor amounts of fluorine. Improved performance is obtained with nitrogen dilution of the chlorine gas over air dilution. Improved polymer composite systems having higher flexural modulus result from the use of the chlorinated rubber particles as fillers instead of unchlorinated rubber particles.
摘要:
A process for making shaped articles by injecting a thermoplastic or thermoset polymer into a mold cavity in which is maintained a reactive atmosphere containing between 0.1 mole % and 50 mole % F.sub.2 and at least 20 ppm O.sub.2 while the polymer is being injected into the mold, such that any portion of the polymer contacts the reactive atmosphere for a time not greater than 0.5 sec.
摘要翻译:一种通过将热塑性或热固性聚合物注射到模腔中来制造成形制品的方法,其中在将聚合物注入模具中时,其保持含有0.1摩尔%至50摩尔%F 2和至少20ppm O 2的反应气氛, 使得聚合物的任何部分与反应性气氛接触不超过0.5秒的时间。
摘要:
The present invention is a method for improving the barrier properties of thermoplastic substrates. A surface of the thermoplastic substrate is contacted with a reactive gas stream having an F.sub.2 concentration greater than or equivalent to 0.0001 atm. partial pressure of F.sub.2 per atm. total pressure and sufficient oxygen such that the F.sub.2 /O.sub.2 ratio is less than or equal to about 100, with the remainder being additional reactive and/or non-reactive components. A barrier coating material is applied to the treated surface of the substrate and subsequently undergoes a curing step to form the final product.
摘要:
This invention relates to an improvement for reducing the amount of wall fouling in the suspension polymerization of vinyl chloride. The improvement resides in wetting the reactor surface with a solution containing selenous acid prior to charging the vinyl chloride recipe to the reactor. Preferably, the surface of the resulting reactor is heated at a temperature of from 40.degree.-100.degree. C. prior to charging the recipe.
摘要:
The present invention describes a system for modifying polymer composite surfaces to achieve 100% adhesion to paints, coatings, adhesives, or inks. The adhesion modification technology overcomes the deficiencies of energy-based treatment technologies common with wood-like polymer composites produced using various types of fillers and reinforcements, and specifically those containing cellulose and lignin.
摘要:
Ground polymer elastomer or other polymeric plastic, particularly from recovered scrap, is surface modified by treatment with a gaseous mixture containing a minor amount of fluorine and a larger amount of at least one reactive gas in an inert gaseous carrier. By the treatment the ground material is made more compatible for admixture with polyfunctional polymer-forming liquids, thereby obtaining novel composites of controlled physical properties. The other reactive gas is preferably oxygen or one of the gases from the group consisting of: chlorine and SO.sub.2 with or without added oxygen.