KR940000964B1 - Aqueous additive systems, methods and polymeric particles - Google Patents

Abstract

No content.

Description

Aqueous Additive System, Methods for Making It and Polymer Particles

This application is the CIP application of Application No. 701,888, filed February 15, 1985.

The present invention relates to an aqueous system for application using additives to polymer particles and to a process for producing an aqueous emulsion comprising high melting point additives, low melting point additives and emulsifiable waxes. The invention also relates to a method of applying an additive to a polymer particle and to polymer particles treated with this method.

Known methods of adding additives to polymer particles include mixing the materials in a dry state, melting and compounding the melted mixture using an extruder and pelletizing or powdering to a desired physical form. There is. Additives include antioxidants, processing aids, lubricants, antiblocking agents, antistatic agents, lubricants, UV stabilizers, binders and colorants.

Another way to add additives to the polymer particles is to add them to the extruder hopper during the end use treatment. In this step, additives such as colorants, lubricants, process aids, blowing agents and the like are added to the original polymer particles in concentrated form. In many cases, it is difficult to quantify the exact amount needed to perform a particular task. This is particularly the case with process aids and external lubricants which cannot generally be used in concentrated form and are also used in very small amounts.

Some polymers are now manufactured with a technology that prevents them from melting into pellets after they are melted into compounds. Polymers such as high density polyethylene, linear low density polyethylene and polypropylene exit the polymerization reactor in the form of dried granules, similar to fluidized bed systems. Currently, additives used in polymers must be melted, compounded, pelletized and added. This extra step can increase the manufacturing cost of such polymers and adversely affect the properties of the polymers.

Additives such as antioxidants or heat stabilizers, colorants and the like may be added to the emulsified or dispersed aqueous system of the present invention. Aqueous emulsions or dispersions can be used as spraying, scrubbing or dipping systems to coat the polymer particles prior to drying or degassing. Such aqueous systems can be made to process polymer particles and can be made of a material made of such polymer particles. The material thus made can be used for packaging such as food, medicine, etc., or for films. Aqueous systems may also include lubricants, release agents, antistatic agents, and the like.

It is very advantageous to apply an aqueous emulsion comprising antioxidants and other additives to such polymers exiting the polymerization reactor in the form of particles using such aqueous treatment means. Such means of adding additives can omit the melting of the polymer into a compound, lower the required production energy and minimize the thermal history of the polymer particles.

The present invention relates to an aqueous coating system for applying additives to polymer particles, which system itself is free of the formation of a chromophoric composite, which system comprises from about 2 to about 10% by weight of surfactant About 5 to about 20% of emulsified wax, about 0.2-about 1.0% of bases having a pH greater than 7 and less than 10.5, about 20-60% of at least one additive which can form a color producing complex and About 40 to about 60% water. The base is selected from sodium tetraborate, sodium carbonate, sodium bicarbonate, calcium carbonate or magnesium carbonate. Additives are tetrakis [methylene 3- (3 ', 5'-di-tert-butyl-4'-hydroxyphenyl) -propionate] methane, octadecyl 3- (3', 5'-di-t -Butyl-4-hydroxyphenyl) propionate, 1,3,5-trimethyl-2,4,6-tris- (3,5-di-t-butyl) -4-hydroxybenzyl) benzene, bis (2,4-di-t-butyl phenyl) pentaerythritol diphosphite, tris (monononylphenyl) phosphite, 4,4'-butylidene-bis (5-methyl-2-t-butyl) phenol , Tris (3,3-di-t-butyl-4-hydroxybenzyl) isocyanurate or 2,2,6,6-tetramethyl-4-piperidinyl sebacate.

The invention also relates to a process for preparing an aqueous emulsion comprising an emulsifiable wax, a first additive component having a melting point of 100 ° C. or lower and a second additive component having a melting point of 100 ° C. or higher. (1) about 40 to about 65% by weight of water, about 12 to about 20% of the first additive agent, about 4 to about 12% of the second additive agent, about 5 to about 20% of emulsifiable Mixing wax, about 0.2 to about 1.0% of base, and about 2 to about 10% of surfactant; (2) stirring the mixture while raising the temperature of the mixture sufficiently to melt all the solids; (3) further add water at least 85 ° C. so that the solids content is at least 25%; (4) reheat to a temperature sufficient to maintain the solid in the molten state; (5) maintaining the heated mixture under pressure conditions sufficient to prevent boiling for a period of time to ensure this temperature and homogeneity; (6) It consists of cooling an emulsion to ambient temperature.

The base preferably has a pH greater than 7 and less than or equal to 10.5 and is selected from sodium tetraborate, sodium carbonate, sodium bicarbonate, calcium carbonate or magnesium carbonate. The first additive component is preferably selected from octadecyl 3- (3 ', 5'-di-t-butyl-4-hydroxyphenyl) propionate or dilauryl thiodipropionate, and the second The additive component is tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4-hydroxyphenyl) propionate] methane, 1,3,5-trimethyl-2,4,6-tris -(3,5-di-t-butyl) -4-hydroxybenzyl) benzene or bis2,4-di-t-butylphenyl) pentaerythritol diphosphite, tris (mono-nonylphenyl) phosphite or Preference is given to selecting from 4.4'-butylidene-bis (5-methyl-2-t-butyl) phenol.

The present invention also includes a method of applying an additive to a polymer particle, which method consists in contacting the particle with the emulsion described above and drying to make the emulsion adhere to the particle surface in a solid state. The present invention includes polymer particles produced by the methods described herein.

The invention also includes a method of making a multicomponent aqueous dispersion useful for treating polymer particles. The present invention also provides a method for easily impregnating high melting components in an emulsified or dispersed aqueous system. Single component systems of high melting point additives are difficult to manufacture. For example, tetrakis [matylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane at 110-125 ° C melting point cannot be emulsified in a single addition system. However, coemulsion with dilauryl thiodipropineate (melting point 40 ° C.) can provide a stable emulsion. Stereohindered phenolic phosphites, bis (2,4-di-t-butylphenyl) pentaerythritol diphosphites with melting points of 160-175 ° C. are not emulsified in a single additive system. However, components or 3 together with low melting point additives such as dilauryl thiodipropionate and octadecyl 3- (3 ', 5'-di-t-butyl-4-hydroxyphenyl) propionate (melting point 50 ° C.) Can be used as a component system.

Aqueous emulsions or dispersions comprising additives such as potassium hydroxide or sodium hydroxide and stabilizers for polymer particles are n-octadecyl-3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) Coloring complexes can be formed when certain additives are present, such as propionate, sterically hindered phenolic primary antioxidants. The formation of this chromophore complex results in an undesirable color for the polymer particles to which the aqueous emulsion or dispersion is applied.

However, when this aqueous emulsion or dispersion comprises sodium tetraborate, sodium carbonate, calcium carbonate or magnesium carbonate or a similar base component having a pH of 7 <pH "d10.5, no chromogenic complex is formed. Sodium tetraborate Emulsions or dispersions, including t-octadecyl 3- (3 ', 5'-di-t-butyl-, may also be used to make the polymer particles coated with an aqueous emulsion or dispersion comprising an additive. It may contain additives such as stabilizers that are 4'-hydroxyphenyl) propionate The amount of sodium tetraborate or similar weak base added to the aqueous emulsion or dispersion is variable, such as 0.2-1.0 wt%.

The aqueous emulsions or dispersions of the present invention include, in addition to water, emulsifiable waxes and desired additives, stabilizers, coloring agents and the like.

Emulsifiable waxes can be any wax that is easily emulsified, such as, for example, emulsifiable polyolefin waxes such as oxidized polyolefin waxes or modified polyolefin waxes. Preferred oxidized polyolefin waxes include oxidized polyethylene waxes having a density of 0.939, a melt viscosity of 250 cps at 125 ° C. and an acid number of 16; Oxidized polyethyllan wax having a melt viscosity of 900 cps and an acid value of 15 at a density of 0.942 and 125 ° C .; Oxidized polyethylene wax having a melt viscosity of 250 cps and an acid group of 16 at a density of 0.955 and 125 ° C .; And maleated polypropylene wax with a melt viscosity of 400 cps and an acid value of 47 at a density of 0.934, 190 ° C.

The aqueous emulsion may comprise emulsified polyethylene waxes having a density of 0.939, a melt viscosity of 250 cps at 125 ° C., and an acid value of 16. Such tanning agents are commercially available Tergitol 15-s-15 [Griffin, W. C., office. Dig. Federation Paint Varnish Prod. Emulsifiers, surfactants, and SWS-211 (food emulsifiers, 10% by weight silicoun compounds) as measured according to Blubs, 28 446 (1950)] Antifoaming agents). These emulsions include potassium hydroxide, sodium, tetraborate, sodium carbonate, sodium bicarbonate, calcium carbonate or magnesium carbonate, morpholine, 2-amino-2-methylpropanol, pine oil fatty acids, ethylene glycol and ethoxylated stearyl alcohols [commercially available Industrol A99 ] May be included.

Additives such as, for example, antioxidants comprising steric hindered phenols, thioesters, organophosphites and steric hindered amines can be readily dispersed or emulsified in aqueous emulsion systems. Preferred materials are octadecyl 3- (3 ', 5'-di-t-butyl-4-hydroxyphenyl) propionate or dilauryl thiodipropionate, tetrakis [methylene 3- (3', 5 ' -Di-t-butyl-4'-hydroxyphenyl) propionate] methane, 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl) -4-hydroxy Oxybenzyl) benzene or bis (2,4-di-t-butyl phenyl) pentaerythritol diphosphite, tris (monononylphenyl) phosphite or 4,4'-butylidene-bis) (5-methyl- 2-t-butyl) phenol. Antioxidants may be used alone or in emulsion systems with two or more ingredients that have a synergistic effect. Various aqueous emulsions can be made in various proportions to broaden the level of concentration required for various end uses and the range of additive forms available.

Polymeric particles include, for example, polyolefins such as crystalline polypropylene, low density polyethylene, high density polyethylene and linear low density polyethylene. Other polymeric materials include copolymers such as crystalline propylene ethylene copolymers, rubbers such as ethylene propylene rubber, and the like, as well as polystyrenes, polyesters, polyamides, and the like.

The present invention provides polymer particles which are stabilized in a unique and effective manner and which do not produce undesirable colors.

The invention will be illustrated by the following examples, which do not limit the scope of the invention and detail the object of the invention.

Example 1

The emulsion used in the following examples is prepared as follows. An emulsion containing emulsifiable waxes, bases, surfactants and additives and sufficient water to bring the solids content to about 60 to 80% is mixed in a pressure vessel covered with glass inside. The mixture is raised to a temperature sufficient to melt all the solids under pressure to keep it from boiling and held for a sufficient time (about 30 minutes) to ensure that the solids melt. Maintaining this pressure, after completion of heating, a sufficient amount of hot water (85-100 ° C.) is added to bring the final solids content to about 25-60%. The emulsion is reheated to this temperature and maintained at a pressure sufficient to prevent boiling at this temperature (approximately 10 minutes) for uniformity and then quickly cooled to ambient temperature (23 ° C.).

Example 2

The following emulsion components: 32.3 parts by weight of octadecyl 3- (3 ', 5'-di-t-butyl-4-hydroxyphenyl) propionate, 10.8 parts by weight of oxidized polyethylene emulsifying wax, 0.5 parts of KOH as base, 6.4 parts of surfactant [Tgititol 15-S-15] are placed in a pressure vessel and sufficient water is added so that the solid content is 70%. Make the total water content of the mixture 50% and make the content of octadecyl 3- (3 ', 5'-di-t-butyl-4-hydroxyphenyl) propionate solids 32% in the total mixture. An emulsion is prepared as in Example 1 by adding another sufficient amount of water. The resulting emulsion is applied to pellets of polypropylene having a density of 0.902 and a melt flow rate of 9. The amount of emulsion used was calculated so that the solids content was 0.3-0.5% by weight of the coated polypropylene pellets. The coated polypropylene pellets were air dried to turn a pale yellowish green.

Example 3

32.3 parts by weight of octadecyl 3- (3 ', 5'-di-butyl-4-hydroxyphenyl) propionate, 10.8 parts of oxidized polyethylene emulsifiable wax, 0.5 parts of sodium tetraborane as base, 6.4 parts of surfactant An emulsion component, (Tgititol 15-S-15), was added to the pressure vessel and sufficient water was added to bring the solids content of the mixture at this stage to about 70%. To 50% by weight of the total water content in the mixture and 32% by weight of the octadecyl 3- (3 ', 5'-di-t-butyl-4-hydroxyphenyl) propionate solids content of the mixture. Water is added as sufficient to prepare an emulsion according to Example 1. The resulting emulsion was applied to pellets of polypropylene having a density of 0.902 and a melt flow rate of 9. The amount of emulsion used was calculated so that the solids content was 0.3-0.5% by weight of the coated polypropylene pellets. The coated polypropylene pellets were air dried to maintain their original white color.

Example 4

Emulsion 30% by weight emulsifiable wax, 9% surfactant (Tutitol 15-S-15), 0.75% KOH, 0.25% sodium meta-bisulfite is added to the pressure vessel and sufficient water is added. The total solids content was made 50%. While stirring the mixture under pressure to prevent boiling, the temperature was raised to a temperature sufficient to melt all solids, held for 30 minutes to allow the solids to melt completely and then quickly cooled to ambient temperature. 25% of this emulsion was placed in a gallon ball-mill, followed by 50% by weight of 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl)- 4-hydroxybenzyl) benzene, 24.9% water and 0.1% antifoam (SWS 211) were added and the resulting mixture was triturated for 16 hours. The final solids content of 1,3,5-trimethyl-2,4,6-tris (3,5-di-t-butyl) -4-hydroxybenzyl) benzene was 50% of the total mixture. The resulting emulsion / dispersion was applied to polypropylene pellets with a density of 0.902 and a melt flow rate of 9. The amount of emulsion / dispersion used was calculated so that the solids content on the coated polypropylene pellets was 0.3-0.5%. The coated polypropylene pellets were air dried to give a purplish purple color.

Example 5

An emulsion / dispersion prepared according to Example 4 using sodium tetraborate instead of calcium hydroxide as a base was applied to a polypropylene pellet having a density of 0.902 and a melt flow rate of 9. The amount of emulsion / dispersion used was calculated so that the solids content on the coated polypropylene pellets was 0.3-0.5%. The coated polypropylene pellets were air dried to show the original white color.

Example 6 (comparative example)

32.3 parts by weight of tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propiotate] methane, 10.8 parts of oxidized polyethylene emulsifiable wax, 0.5 parts of KOH as base, 6.4 parts of surfactant [Tgititol 15-S-150] was placed in a reaction vessel and water was added so that the solids content was about 70%. An emulsion was prepared according to Example 1. The total water content is 50% of the mixture and the final solid content of tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane is 32% by weight. Sufficient water was added to Efforts to emulsify have not been successful because tetrakis methylene-3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate methane cannot be covalently co-emulsified with emulsifiable oxidized polyethylene wax. .

Example 7

11 parts by weight of tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane, 21 parts of dilaurylthiodipropionate, 10.8 parts of oxidized polyethylene An emulsifiable wax, an emulsifying component of 0.5 parts KOH as base, and 6.4 parts surfactant (tergitol 15-S-15), was placed in a pressure vessel and sufficient water was added so that the solids content was about 70% of the mixture. The total water content is 50% of the mixture and tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane and dilauryl thiodipropionate An emulsion was prepared according to example 1 by adding sufficient water to bring the solids content of 32% of the mixture. A stable emulsion was obtained.

Example 8

7.3 parts by weight of tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionecht] methane, 21 parts of dilauryl thiodipropionate, 4 parts of bis (2 , 4-di-t-butylphenyl) pentaerythritol diphosphite, 10.8 parts oxidized polyethylene emulsifiable wax, 0.5 parts KOH as base, 6.4 parts surfactant (Tgititol 15-S-15) Sufficient water was added to the vessel to bring the solids content to about 70%. Allow the total content to be 50% by weight of the mixture and add tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane and dilaurylthiodipropio An emulsion was prepared according to Example 1 by adding sufficient water so that the solids content of nate and bis (2,4-di-t-butyl-butylphenyl) pentaerythritol diphosphite was 32%. A stable emulsion was obtained.

Example 9

32.3 parts by weight of dilauryl thiodipropionate, 10.8 parts of oxidized polyethylene emulsifiable wax, 0.5 parts of KOH as base, and 6.04 parts of surfactant (tergitol 15-t-15) were placed in a reaction vessel and sufficient water was added. In addition, the solid content was made to be 70%. An emulsion was prepared according to Example 1 by adding water so that the total water content was 50% by weight of the mixture and the solids content of the dilauryl thiodipropionate in the total mixture was 32%. A stable emulsion was obtained.

Example 10

9.6 parts by weight of tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane, 16 parts of dilauryl thiodipropionate, 6.4 parts of tris (mono Nonylphenyl) phosphite, 10.8 parts of oxidized polyethylene emulsifiable wax, 0.5 parts of KOH as base, and 6.4 parts of surfactant (tergitol 15-S-15) were added to the reaction vessel and the solid content was about 70%. Water was added as possible. The total water content is 50% by weight of the mixture and the tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane and dilauryl tea of the total mixture. An emulsion was prepared according to Example 1 by adding sufficient water so that the solids content of Odypropionate and Tris (mono-nonylphenyl) phosphite was 32%. A stable emulsion was obtained.

Example 11

8 parts by weight of tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane, 10.7 parts tris (mono-nonylphenyl) phosphite, 8 parts dira Usyl thiodipropionate, 13.2 parts of oxidized polyethylene emulsifiable wax, 0.75 parts of KOH as base and 6 parts of surfactant (tergitol 15-S-15) were placed in a reaction vessel and the solid content was about 70%. Pour enough water if possible. The total water content is 60% by weight of the mixture and the tetrakis methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate methane, tris (mono-nonyl) in the total mixture An emulsion was prepared according to Example 1 by pouring sufficient amount of water so that the solids content of phenyl) phosphite and dilauryl thiodipropionate was 23%. A stable emulsion was obtained.

Example 12

9 parts by weight of tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane, 12 parts tris (mono-nonylphenyl) phosphite, 9 parts dira We have thiol propionate, 10 parts of oxidized polyethylene emulsifiable wax, 0.75 parts of KOH as base, and 6 parts of surfactant (tergitol 15-S-15) into the reaction vessel and the solid content is about 70%. Sufficient amount of water was added as possible. Let the total water content be 60% by weight of the mixture and add tetrakis methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane, tris (mononononyl) in the total mixture. An emulsion was prepared according to Example 1 by pouring sufficient water so that the solids content of phenyl) phosphite and dilauryl thiodipropionate was 26%. A stable emulsion was obtained.

Example 13

9.6 parts by weight of tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane, 12.8 parts tris (mono-nonylphenyl) phosphite, 9.6 parts dira Usyl thiodipropionate, 8 parts of oxidized polyethylene emulsifiable wax, 0.75 parts of KOH as base and an emulsion component of surfactant (Tgititol 15-S-15) are placed in a pressure vessel sufficient to have a solids content of about 70%. Water was added. The total water content is 60% by weight of the mixture and the tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane, tris (mono) in the total mixture An emulsion was prepared according to Example 1 by adding sufficient water to bring the solids content of nonylphenyl) phosphite and dilauryl thiodipropionate to 27%. A stable emulsion was obtained.

Example 14

10.3 parts by weight of tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane, 15.4 parts tris (monononylphenyl) phosphite, 10.3 parts dilauryl Thiodipropionate, 4 parts of oxidized polyethylene emulsifiable wax, 0.75 parts of KOH as base, and 6 parts of surfactant (tertitol 15-S-15), an emulsion component, were placed in a pressure vessel and sufficient water was added to give a solid content. Enough water was made to be 70%. The total water content is 60% by weight of the mixture and the tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane, tris (mono) in the total mixture An emulsion was prepared according to Example 1 by adding a sufficient amount of water so that the solids content of nonylphenyl) phosphite and dilauryl thiodipropionate is 31%. A stable emulsion was obtained.

Example 15 (comparative example)

8 parts by weight of tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane, 18.8 parts dilauryl thiodipropionate, 13.2 parts oxidized polyethylene An emulsion component, emulsifiable wax, 1.5 parts KOH as base and 6 parts surfactant (tergitol 15-S-15), was added to the dark container and sufficient water was added to bring the solids content of the mixture to about 70%. The total water content of the mixture is 69% and tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl (propiotate] methane and dilauryl tea) in the total mixture. An emulsion was prepared according to Example 1 by adding sufficient water to bring the content of the odypropionate solids to 17%. A poor emulsion was obtained.

Example 16

8 parts by weight of tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane, 18.8 parts dilauryl thiodipropionate, 13.2 parts oxidized polyethylene An emulsifiable wax, an emulsion component of 0.75 parts KOH as base, 6 parts surfactant (tertitol 15-S-15), was added to the pressure vessel and sufficient water was added to bring the solids content of the mixture to about 70%. The total water content of the mixture is 69% by weight and tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane and dilauryl in the total mixture. An emulsion was prepared according to Example 1 by adding a sufficient amount of water to bring the solids content of thiodipropionate to 17%. A stable emulsion was obtained.

Example 17 (comparative)

30 parts by weight of octadecyl 3- (3 ', 5'-di-t-butyl-4-hydroxyphenyl) propionate, 10 parts of oxidized polyethylene emulsifiable wax, 0.2 parts of sodium tetraborate as base, 6 parts of interface An emulsion component, the active agent (tergitol 15-S-15), was added to the pressure vessel and sufficient water was added to bring the solids content of the mixture to about 70%. The total water content of the mixture is 50% by weight and the solid content of octadecyl 3- (3 ', 5'-di-t-butyl-4-hydroxyphenyl) propionate in the total mixture is 32.5%. An emulsion is prepared according to Example 1 by adding a sufficient amount of water. A poor emulsion was obtained.

Example 18

30 parts by weight of octadecyl 3- (3 ', 5'-di-t-butyl-4-hydroxyphenyl) propionate, 10 parts of oxidized polyethylene emulsifiable wax, 0.4 parts of sodium tetraborate as base, 6 parts of interface An emulsion component, the active agent (tergitol 15-S-15), was added to the pressure vessel and sufficient water was added to bring the solids content of the mixture to about 70%. The total water content of the mixture is 50% by weight and the solid content of octadecyl 3- (3 ', 5'-di-t-butyl-4-hydroxyphenyl) propionate in the total mixture is 32.5%. An aqueous emulsion is prepared according to example 1 by adding a sufficient amount of water. A stable emulsion was obtained.

Example 19

30 parts by weight of octadecyl 3- (3 ', 5'-di-t-butyl-4-hydroxyphenyl) propionate, 10 parts of oxidized polyethylene emulsifiable wax, 0.8 parts of sodium tetraborate as base, 6 parts of interface An emulsion component, activator (Tgititol 15-S-15), was added to the pressure vessel and sufficient water was added to bring the solids content of the mixture to about 70%. The total water content of the mixture is 50% by weight and the solids content of octadecyl 3- (3 ', 5'-di-t-butyl-4-hydroxyphenyl) propionate in the grooves is 32.5%. An emulsion is prepared according to Example 1 by adding a sufficient amount of water to make. A stable emulsion was obtained.

Example 20 (Comparative Example)

Polypropylene pellets having a density of 0.906 and a melt flow rate of 4 were charged with sufficient tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane, tris (mono) The melt mixture was made with nonylphenyl) phosphite and dilauryl thiodipropionate to make the degree of stabilization 0.15%, 0.10 and 0.25% based on the weight of the polypropylene. After extrusion and pelletization, stabilized polypropylene was aged in an oven at 150 ° C. and oxidative stability was measured. Polypropylene did not degrade after 40 days at 150 ° C.

Example 21

8 parts by weight of tetrakis methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate methane, 13.4 parts of dilauryl thiodipropionate, 5.4 parts of tris (mononononylphenyl Phosphite, 13.2 parts of oxidized polyethylene emulsifiable wax, 0.75 parts of KOH as base, and 6 parts of surfactant (tertitol 15-S-15), an emulsion component is added to the pressure vessel and sufficient water is added to the solid of the mixture. The content was made to about 70%. The total water content of the mixture was brought to about 50%. The total mixture content is 50% by weight and tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane, dilauryl in the total mixture. An emulsion was prepared according to Example 1 by adding a sufficient amount of thiodipropionate, tris (mononylylphenyl) phosphite solid to about 17%. A stable emulsion was obtained.

Example 22

The emulsion of Example 21 was coated on polypropylene pellets with a density of 0.906 and a melt rate of 4 to give tetrakis methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propiotate methane , Dilauryl thiodipropionate and tris (mononylylphenyl) phosphite were coated with 0.15%, 0.25% and 0.10%, respectively. The coated polypropylene was aged in a 150 ° C. oven to measure the oxidation stability. The polypropylene did not decompose after 49 days at 150 ° C., which is tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane, dilauryl thi It is shown that the polypropylene stabilized with an aqueous emulsion of adipropionate and tris (mononylylphenyl) phosphite is comparable to the polypropylene stabilized with the same compound at the same level as in Example 20.

Although the present invention has been described in detail as preferred embodiments, it can be modified and changed within the spirit and scope of the invention.

Claims (16)

2 to 10 weight percent surfactant, 5 to 20 weight percent emulsified wax, 0.2 to 1.0 weight percent base having a pH greater than 7 and less than or equal to 10.5, 20 to about 60 weight percent capable of forming a chromogenic complex An aqueous system for application to apply an additive to a polymer particle, comprising at least one additive and from 40 to 60% by weight of water, and which is itself free from forming a chromogenic composite. The aqueous system of claim 1 wherein the base is selected from sodium tetraborane, sodium carbonate, sodium bicarbonate, calcium carbonate or magnesium carbonate. The process of claim 1 wherein the additive is tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane, octadecyl 3- (3', 5 ' -Di-t-butyl-4-hydroxyphenyl) propionate, 1,3,5-triketyl-2,4,6-tris (3,5-di-t-butyl) -4-hydroxybenzyl ) Benzene, bis (2,4-di-t-butyl phenyl) pentaerythritol diphosphite, tris (mononylyl) phosphite, 4.4'-butylidene-bis (5-methyl-2-t- An aqueous system selected from butyl) phenol, tris (3,5-di-T-butyl-4-hydroxybenzyl) isocyanurate or 2,2,6,6-tetramethyl-4-piperidinyl sebacate. The method of claim 2, wherein the additive is tetrakis [methylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane, octadecyl 3- (3', 5 ' -Di-t-butyl-4-hydroxyphenyl) propionate, 1,3,5-trimethyl-2,4,6-tris- (3,5-di-t-butyl) -4-hydroxybenzyl ) Aqueous system selected from benzene or bis- (2,4-di-t-butylphenyl) pentaerythritol diphosphite. (1) 40 to 65% by weight of water, 12 to 20% first additive component, 4 to 12% second additive component, 5 to 20% emulsifiable wax, 0.2 to 1.0% base and 2 to 10% of surfactant is mixed; (2) raising the temperature of the mixture to melt all solids while stirring the mixture; (3) pour water at least 85 ° C. to a solids content of at least 25%; (4) reheat to a temperature sufficient to keep the solid molten; (5) maintaining the heated mixture at this temperature for a period of time under sufficient pressure to prevent boiling to ensure homogeneity; (6) an aqueous solution comprising a first additive component having a melting point of 100 ° C. or lower and a second additive component having a melting point of 100 ° C. or higher and an emulsifiable wax, consisting of cooling the emulsion to ambient temperature How to prepare an emulsion. 6. The method of claim 5, wherein the base has a pH of at least 7 and no more than 10.5. 7. The process of claim 6 wherein the base is selected from sodium tetraborate, sodium carbonate, sodium bicarbonate, calcium carbonate or magnesium carbonate. The method of claim 6 wherein the first additive component is selected from octadecyl 3- (3 ', 5'-di-t-butyl-4-hydroxyphenyl) propionate or from dilauryl thiodipropionate. Way. The method of claim 8 wherein the second additive component is tetrakis [ketylene 3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate) methane, 1,3, 5-trimethyl-2,4,6-tris (3,6-di-t-butyl) 4-hydroxybenzyl) benzene or bis (2,4-di-t-butylphenyl) pentaerythritol diphosphite, Tris (mononylylphenyl) phosphite or 4,4'-butylidene-bis (5-methyl-2-t-butyl) phenol. A method of applying additives to polymer particles, comprising contacting the polymer particles with the aqueous system of claim 1 and then drying the polymer particles. A method of applying additives to polymer particles, comprising contacting the polymer particles with the aqueous system of claim 2 and then drying the polymer particles. A method of applying additives to a polymer particle, comprising contacting the polymer particle with an aqueous emulsion prepared according to claim 5 and then drying the particle. Polymer particles treated by the method of claim 10. A polymer particle treated by the method of claim 11. Polymer particles treated by the method of claim 12. An aqueous emulsion prepared by the process of claim 5.