KR930700563A - Process for the preparation of modified homogeneous copolymers of ethylene / alpha olefin carboxylic acids or esters - Google Patents

Abstract

No content.

Description

Process for the preparation of modified homogeneous copolymers of ethylene / alpha olefin carboxylic acids or esters

Since this is an open matter, no full text was included.

Figure 1 is intended to help visually with respect to the concept of the present invention and does not accumulate in a certain proportion. Unless otherwise stated in the above description, all parts are by weight.

Claims (12)

Either lower temperature (a) or higher pressure (b) than is required when the modifier is absent, using conditions of synthesis of temperature and pressure raised to higher levels than the phase economy between two-phase and single-phase processes Controlling the small amount of the telogen modifier and the high molecular weight of the copolymer by using, or both, and also controlling one or more telogen modifier (s) feed rate or unreacted gas recovery rate or both. A well stirred autoclave reactor operated in a continuous manner, under substantially constant conditions, under steady-state conditions, in a single phase reaction mixture, in the presence of a small amount of one or more telogen modifiers, under the influence of free radical initiators. And the monomers when feeding monomers, telogen modifier (s) and initiator into the reactor and removing the reaction mixture At least one selected from the group consisting of 99% to 65% by weight of ethylene monomers and unsaturated carboxylic acids, alkyl acrylates and alkyl methacrylates, including copolymerizing the monomers at an unreacted gas recovery sufficient to enhance the autonomous copolymer Modification of high molecular weight, comprising 1% to 35% by weight of olefinic unsaturated comonomer and having a melt index of 0.1 to 300g / 10min and reduced long chain branching as measured by ASTM D-1238 (190 ° C / 2160g) Of a homogeneous random copolymer prepared. The process of claim 1 wherein the copolymer prepared as above comprises 99% to 88% by weight of ethylene units in the copolymer chain. The method of claim 1 wherein said olefinically unsaturated comonomer comprises acrylic acid. 4. The process according to claim 3, wherein the copolymer prepared as above comprises 99% to 88% by weight of ethylene units in the polymer chain and the acrylic acid units occupy the remaining percentage excluding terminal telogen groups on the polymer chain. The method of claim 1 wherein the telogen modifier or modifiers are at least one alkan, alkene, alcohol, ketone, hydrogen, silane, cyclic hydrocarbon, aromatic hydrocarbon, halogenated hydrocarbon, sulfoxide, ether, ester, amine amide, nitrile, anhydride , Furan, aldehyde, cyanate, or sulfide in a concentration of 0.0001% to 10% by weight. 6. The method of claim 5, wherein said telogen modifier is isobutane. The method of claim 1 wherein the synthesis conditions are such that (a) the pressure is higher than typically required to prepare a single phase reaction mixture without the use of a modifier or (b) the temperature is lower than this, or (a) or ( b) in the presence of a modifier sufficient to meet all of the conditions, and elevated temperatures from 150 ° C. to 350 ° C. at least 1 ° C. higher than the minimum amount required to prepare the single phase reaction mixture and from 124 to 345 MPa at least 7 Pa higher than the amount. How to. A well stirred autoclave reactor operated in a continuous manner and at an unreacted gas recovery rate sufficient to produce high molecular weight copolymers at steady state conditions using free radical polymerization initiators under substantially constant temperature, pressure and flow rate conditions. 99% to 65% by weight of ethylene monomer and at least one copolymerizable olefinically unsaturated comonomer selected from the group consisting of unsaturated carboxylic acids, alkyl acrylates and alkyl methacrylates, including copolymerizing monomers in Melt index, narrow molecular weight distribution and / or lower molecular weight polymer fraction and reduced long chain branching, including by weight and measured by ASTM D-1238 (190 ° C./2160 g) Method for producing a substantially homogeneous polymer-flavored random copolymer having a (wherein, within 0.001% by weight 10% by weight of alkanes, alkenes, alcones, ketones, hydrogen, silanes, cyclic hydrocarbons, aromatic hydrocarbons, halogenated hydrocarbons, sulfoxides, ethers, esters, amines, amides, nitriles, anhydrides, furans, aldehydes, citates or sulfides Temperature and pressure conditions exceed those required to work at the phase boundary during the reaction in the presence of one or more polymerization modifiers selected from these, resulting in copolymers having smaller amounts of long chain branching, Flow rate conditions to adjust the molecular weight of the copolymer). The method of claim 8, wherein said copolymerizable olefinic unsaturated comonomer comprises an unsaturated carboxylic acid. The method of claim 8, wherein said copolymerizable olefinically unsaturated comonomer comprises acrylic acid. The method of claim 10, wherein said polymerization modifier is isobutane. ※ Note: The disclosure is based on the initial application.