Abstract: The present invention relates to a solution of a polyacrylate resin in one or more organic solvents, containing one or more phosphites, characterized in that the solution contains from 0.05 to 1.0% by weight, based on the solids content of the acrylate resin solution, of one or more phosphites and in that the phosphite has been added, either partially or entirely, after the polymerization reaction, at a temperature below the polymerization temperature.The present invention further relates to coating compositions which contain these polyacrylate resin solutions, their use in processes for producing a multilayer protective and/or decorative coating on a substrate surface, and the use of the coating compositions in the automotive refinishing sector.

Abstract: Phosphonites which are useful as a deterioration inhibitor for organic material and are represented by the following formula: ##STR1## wherein X represents a connecting group, and R.sup.A represents a phenyl group which may be optionally substituted; and a process for producing the same are provided.

Abstract: Phosphites inhibitors for organic material represented by the formula: ##STR1## wherein R.sup.1, R.sup.2, R.sup.4 and R.sup.5 independently represent hydrogen atom, an alkyl group, a cycloalkyl group, an alkylcycloalkyl group, an aralkyl group or a phenyl group; R.sup.3 is hydrogen atom or alkyl; X is a direct bond, sulfur atom, or methylene group which may optionally be substituted with alkyl or cycloalkyl; A represents a dihydric alcohol residue; B is a direct bond or alkylene; and one of Y and Z represents an alkoxy group or an aralkyloxy group, and the other one represents hydrogen atom or an alkyl group; and a process for producing the same are provided.

Abstract: A resin composition of propylene-ethylene random copolymer comprising (a) a propylene-ethylene random copolymer, (b) at least one alkali salt selected from the group consisting of alkali carboxylates, alkali .beta.-diketonates and alkali salts of .beta.-ketacetate, (c) an organophosphoric compound, and (d) a lithium aluminum compound. The organophosphoric compound is represented by the following formula (I): ##STR1## wherein R.sub.1 is hydrogen or an alkyl group having 1 to 4 carbon atoms, each of R.sub.2 and R.sub.3 is independently hydrogen or an alkyl group having 1 to 12 carbon atoms, M is a metal atom of an element selected from the group consisting of Group III, IV, XIII and XIV elements of the Periodic Table, and X is --OH when M is a metal atom of an element of Group III or XIII of the Periodic Table or X is .dbd.O or (--OH).sub.2 when M is a metal atom of an element of Group IV or XIV of the Periodic Table, and the lithium aluminum compound is represented by the following formula (II):?Al2Li(OH).sub.

Abstract: A phosphite stabilizer for organic material is represented by the formula (1): ##STR1## wherein R.sup.1, R.sup.2, R.sup.4 and R.sup.5 is hydrogen, alkyl, cycloalkyl, alkyl, cycloalkyl, aralkyl or phenyl; R is hydrogen or alkyl; X is a direct bond, sulfur atom or a --CHR.sup.6 group in which R.sup.6 represents hydrogen, alkyl or cycloalkyl; A is an alkylene group having 2 to 8 carbon atoms or *--COR.sup.7 -- in which R.sup.7 is a direct bond or alkyl group, and * represents the bond to the oxygen atom of the phenoxy radical; and one of Y and Z represents a hydroxyl group, an alkoxy group or an aralkoxy group and the other one represents atom or an alkyl group.

Abstract: A description is given of a process for the production of polyolefin hollow articles, which comprises charging the polyolefin with a stabilizer combination, comprising (A) at least one compound from the group of the organic phosphites or phosphonites, and (B) at least one compound from the group of the 3-arylbenzofuranones, filling this mixture into a mold, heating this mold in an oven to above 280.degree. C., such that the stabilised polyolefin fuses, rotating the mold around at least 2 axes, the plastic spreading to the walls, and cooling the mold while still rotating, opening it and taking the resultant hollow article out.

Abstract: Plastic mixtures, in particular recycled plastic mixtures, comprising predominantly polyolefins and 0.05-20% by weight of PVDC can be stabilized against thermo-oxidative degradation by addition of a combination of an organic phosphite or phosphonite and a metal salt of a fatty acid.

Abstract: The invention relates to cyclic diphosphoric esters of the formula ##STR1## with R=methylethylene, 1,3-cyclohexylene, 1,4-cyclo-hexylene or 1,3-phenylene, a process for their preparation and their use as flame retardants.

Abstract: Phosphites represented by the general formula (I): ##STR1## wherein R.sup.1, R.sup.2, R.sup.4 and R.sup.5 independently represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, an alkylcycloalkyl group having 6 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms or a phenyl group; R.sup.3 and R.sup.6 independently represent a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; X.sub.1 is a dihydric alcohol residue, wherein HO--X.sub.1 --OH defines the corresponding dihydric alcohol from which residue X.sub.1, is obtained; and X.sub.2 is a direct bond or an alkylene group having 1 to 8 carbon atoms; and the phosphites are useful as stabilizers for organic materials.

Abstract: Certain (1,3,2-dioxaphosphorinanemethan) amine compounds, which are useful as flame retardant compounds, are disclosed. The compounds are particularly useful in polyurethane compositions.

Abstract: Phosphites which are a deterioration inhibitors for organic material represented by the formula: ##STR1## wherein R.sup.1 and R.sup.2 independently represent a hydrogen atom, or certain hydrocarbyl radicals; X represents a direct bond, a sulfur atom or a methylene group which may optionally be substituted; Z is --A.sup.1 --CO--O--Y.sup.1 or --A.sup.2 --O--CO--Y.sup.2 wherein A.sup.1 is a direct bond or an alkylene group; Y.sup.1 is aralkyl or aryl; A.sup.2 is a residue of a dihydric alcohol; and Y.sup.2 is alkyl, aralkyl or a phenyl group, and a process for producing the same are provided.

Abstract: A polymeric composition in which (D) a phenol antioxidant having a specific skeleton 5-t-butyl-3-methyl-4-hydroxyphenyl, (C) a hindered amine photostabilizer having a molecular weight of not less than 400, and (D) a specific phosphorus compound dihydrooxaphosphaphenanthrene are included in (A) a polymeric compound. This polymeric composition is excellent in thermal oxidation degradation resistance and discoloration of coloring resistance in contacting with a combustion gas or the like.

Abstract: A composition and method of treating a dental tooth surface and adhering a restorative material to the treated dental tooth surface is provided. A liquid composition is applied to at least the portion of the tooth to form a treated surface. The composition includes at least 50 percent by weight of a volatile organic solvent, at least 15 percent by weight of one or more polymerizable acrylate compounds and an effective amount of a photoinitiator. At least a portion of the polymerizable compounds are multifunctional polymerizable compounds having at least three acrylate moieties. The polymerizable compounds are substantially soluble in the solvent. The composition is adapted to form a polymeric material which is adapted to adhere to dentin with a bond strength of at least 12 Mpa. Restorative material is then adhered to the treated surface with a bond strength of at least about 12 MPa.

Abstract: The invention relates to flame retardant polymeric compositions which comprise a halogen-free cyclic phosphoric acid ester of the formula (I) ##STR1## where R=phenyl or methyl substituted phenyl as a flameproofing agent.

Abstract: A diphosphite is provided derived from phosphorous trihalide, tetra alkyl hindered bisphenol, and a neoalkyl diol. The phosphites exhibit improved stability and are useful as thermal oxidative stabilizers for thermoplastic compositions.

Abstract: A polypropylene resin composition comprising (a) 100 parts by weight of a propylene polymer having an isotactic pentad fraction of 96% or more which is determined by .sup.13 C-NMR, (b) 0.01-5 parts by weight of at least one alkali salt selected from the group consisting of alkali carboxylates, alkali .beta.-diketonates and alkali salts of .beta.-ketacetate, (c) 0.01-5 parts by weight of an organophosphoric compound, and (d) 0.01-0.5 parts by weight of a lithium aluminum compound. The organophosphoric compound is represented by the following formula (I): ##STR1## wherein R.sub.1 is hydrogen or an alkyl group having 1 to 4 carbon atoms, each of R.sub.2 and R.sub.3 is independently hydrogen or an alkyl group having 1 to 12 carbon atoms, M is a metal atom of an element selected from the group consisting of Group III, IV, XIII and XIV elements of the Periodic Table, and X is --OH when M is a metal atom of an element of Group III or XIII of the Periodic Table or X is .dbd.O or (--OH).sub.

Abstract: A polyphenylene ether resin composition containing the following Components (A) to (D) according at the following formulation ratio.(A) 50 to 99.5 parts by weight of a polyphenylene ether(B) 0.5 to 50 parts by weight of a partially hydrogenated aromatic alkenyl compound-conjugated diene block copolymer having a hydroxy group and based on 100 parts by weight of the above resin composition,(C) 0 to 950 parts by weight of a thermoplastic resin and(D) 0 to 10 parts by weight of a phosphorous acid triester.

Abstract: A propylene resin extruded article comprising 100 parts by weight of a propylene resin, 0.03 to 2 parts by weight of a metal salt of a rosin compound, 0.01 to 1 part by weight of a tertiary amine light stabilizer, and 0.01 to 0.5 part by weight of an aromatic phosphite and/or phosphonite antioxidant, and a propylene resin extruded article further comprising 0.01 to 0.5 part by weight of an antistatic agent in addition to the above components. The resin compound comprising the above components does not contaminate extrusion equipment, and the extruded articles are excellent in transparency, hue, thermal aging resistance and, when the antistatic agent is used, are excellent in antistatic property.

Abstract: A method for producing alkyl derivatives of phosphonic acids together with hexyl-bis?5-ethyl-2-hexyl-1,3,2-dioxaphosphorinan-5-yl)methyl!ester, P,P'dioxide as a novel product and the use of such a product as, or in connection with, a flame retardant.

Abstract: This invention relates to a preparation comprising a transparent syringe body or container, which has been obtained by molding a resin comprising, as a base material, a propylene polymer, and as a nucleating agent, a phosphoric ester represented by the following general formula (1): ##STR1## and a drug solution charged into the syringe body or container. The preparation is excellent in transparency, free from the dissolution of additives for the resin into the drug solution charged therein even when the drug solution remains charged for a long period of time and hence high in safety. The preparation is useful, in particular, as a syringe preparation charged with a drug solution therein.

Abstract: A phosphite is provided having the formula: ##STR1## wherein Y.sup.1 is an alkyl group and Y.sup.2 is selected from the group consisting of sec-butyl and tert-butyl. The phosphite exhibits enhanced stability including hydrolytic and UV stability, and is useful in stabilizing thermoplastic compositions.

Abstract: A phosphite and stabilized thermoplastic composition comprising the phosphite where the phosphite has the formula: ##STR1## In the above compound, R.sup.7 and R.sup.8 are preferably alkyl of from 1 to 6 carbon atoms, most preferably an unsubstituted alkyl group. R.sup.9 is preferably alkyl of 1 to 12 carbon atoms. m is from 0 to 5. The dicumyl group includes the OX groups which are the phosphite portion. The OX group is hindered by only one alkylaryl group at the ortho position with the other ortho position being occupied by hydrogen. X has the following formula: ##STR2## wherein R.sub.2 is independently selected from the group consisting of alkyl groups having from 1 to 12 carbon atoms. z.sub.1 and z.sub.2 can be 0 or 1. R.sub.3, R.sub.4 and R.sub.5 are independently selected from the group consisting of hydrogen, halogen, or alkyl of from 1 to 3 carbon atoms.

Abstract: A stabilizer blend composition is provided containing a phosphite of the formula: ##STR1## wherein Y.sup.1 is an alkyl and Y.sup.2 is tert-butyl, and an additive which is preferably a hindered phenolic, a thioester, a neutralizer, a UV stabilizer or a UV absorber. The composition in solid particle form exhibit reduced levels of dusting and are useful in polymer stabilization processes for stabilizing polymeric materials.

Abstract: A phosphite is provided having the formula: ##STR1## wherein Y.sup.1 is an alkyl group and Y.sup.2 is selected from the group consisting of sec-butyl and tert-butyl. A solid amorphous phosphite composition is also provided which preferably contains an aliphatic polyamine. The phosphite exhibits enhanced stability including hydrolyric and UV stability, and is useful in stabilizing thermoplastic compositions. The phosphite composition exhibits further enhancements in hydrolytic stability, and is useful in stabilizing thermoplastic compositions.

Abstract: A flame retardant composition comprising an effective synergistic flame retardant combination of a melamine phosphate and tris(neopentyl) nitrilotris(methylphosphonate) suitable for use as an additive to a normally flammable polymer composition, especially wire insulation and cable jackets.

Abstract: An organic phosphorus compound represented by the following formula (I): ##STR1## wherein R.sup.1 and R.sup.2 independently represent alkyl having 1-8 carbon atoms, cycloalkyl having 5-8 carbon atoms, alkylcycloalkyl having 6-12 carbon atoms, arylalkyl having 7-12 carbon atoms or phenyl; R.sup.3 represents hydrogen or alkyl having 1-8 carbon atoms, X represents a direct bond or --CH(R.sup.4)-- wherein R.sup.4 represents hydrogen or alkyl having 1-8 carbon atoms; a phosphorus type stabilizer for various organic materials such as synthetic resins or synthetic rubbers or an organic material composition comprising the same.

Abstract: A propylene resin composition comprising: a polypropylelne having specific physical properties, 25.about.40% by weight; a propylene-ethylene block copolymer, 25.about.45% by weight; an ethylene-propylene rubber, 5.about.15% by weight; an ethylene-.alpha.-olefin copolymer, 5-15% by weight; and a talc, 5-30% by weight; is superior in all of the following properties concurrently: rigidity, heat resistance, impact resistance, surface hardness, etc.; and is suited for use in machine parts such as automobile parts; electric and electronic parts; packaging materials, engineering plastic substitutes, etc.

Abstract: Thermoplastic compositions are stabilized with a phosphite of the formula: ##STR1## wherein Y.sup.1 is an alkyl and Y.sup.2 is selected from tert-butyl and sec-butyl. The phosphite is particularly effective for thermoplastics irradiated with high energy gamma-radiation. Irradiated articles made with the phosphite stabilized thermoplastic compositions exhibit improved discoloration resistance compared to various other phosphite stabilized thermoplastic compositions.

Abstract: Melt extrusion processes utilizing a neo alkyl phenyl phosphite stabilized polyolefin composition are provided. The processes exhibit reduced levels of screen pack plugging during fiber and film extrusion processes compared to processes utilizing various other phosphites.

Abstract: A process is provided for stabilizing thermoplastic particles with organic phosphite particles. The process involves applying a liquid, relatively low molecular weight, phosphite to the surface of thermoplastic particles. The particles exhibit hydrolysis compared to conventional phosphite shell/polymeric core structures. The particles may be molded into useful thermoplastic articles.

Abstract: A polymerization process is provided involving a carrier solution containing an organic solvent and a phosphite. The phosphite is highly soluble in the solvent and allows for an incorporation of a minimum of solvent in the carrier sohltion. The phosphite is of the formula: ##STR1## wherein Y.sup.1 is an alkyl and Y.sup.2 is selected from tert-butyl and sec-butyl. The process is useful for making polymers such as styrene-butadiene block copolymers which may then be molded to produce commercial articles or may be blended with other thermoplastics to enhance the impact strengths thereof.

Abstract: A polyolefin composition is provided which is resistant to gas fading upon exposure to atmospheric pollutants. The compositions containing a stabilizing amount of a phosphite of the formula ##STR1## wherein Y.sup.1 is an alkyl, preferably t-butyl, and Y.sup.2 is t-butyl or sec-butyl. Fibers and films made from the composition exhibit improved fade resistance compared to fibers and films made from polyolefins stabilized with various other commercially available phosphite. The compositions also contain an additive selected from hindered phenolic antioxidants and hindered amine light stabilizers.

Abstract: Neoalkyl phosphite provided which exhibit improved levels of stability. The phosphites are hindered and are useful in stabilizing thermoplastic compositions.

Abstract: Neoalkyl alkylidene-2,2'-bisphenyl phosphite esters are provided. The phosphites exhibit enhanced thermal and hydrolytic stability, and are useful as additives in thermoplastic resin compositions to enhance the thermal oxidative stability thereof.

Abstract: A pourable liquid thickening composition for aqueous systems including latex coatings is described. The composition comprises in specified ratios an associative thickener polymer, water and one or more surfactants. Associate thickener polymers include polyurethanes, polyesters, polyacrylamides, modified hydroxyethyl celluloses, alkali soluble emulsions and other chemicals. Specific surfactants include dialkyl sulfosuccinates, alkyl sulfates, alpha olefin sulfonates and sulfates of ethoxylated alcohols.

Abstract: A phosphite is provided having the formula: ##STR1## wherein Y.sup.1 is an alkyl group and Y.sup.2 is selected from the group consisting of sec-butyl and tert-butyl. The phosphite exhibits enhanced stability including hydrolytic and UV stability, and is useful in stabilizing thermoplastic compositions.

Abstract: Disclosed are a thermoplastic resin composition which comprises(A) 10 to 90% by weight of a polyphenylene ether,(B) 90 to 10% by weight of a saturated polyester,(C) 0.1 to 10 parts by weight of an organic phosphorous acid compound represented by the formula: ##STR1## wherein n represents 1 or 2; Ar represents an aryl group having 6 to 30 carbon atoms or a substituted aryl group and when n is 2, Ars may be the same or different; and R represents an alkylene group having 2 to 18 carbon atoms or arylene group when n is 1 and represents an alkanetetrayl group having 4 to 18 carbon atoms when n is 2, based on 100 parts by weight of Components (A) and (B) , and(D) 0 to 10 parts by weight of an acid receptor based on 100 parts by weight of Components (A) and (B),and a process for preparing the same.

Abstract: Novel compounds of the formula I and formula II ##STR1## in which R and R.sub.1, independently of one another, are hydrogen or C.sub.1 -C.sub.4 alkyl or together with the carbon atom to which they are attached form a 3,4-dehydrocyclohexylidene ring,R.sub.2 is hydrogen, C.sub.1 -C.sub.8 alkyl or C.sub.5 -C.sub.6 cycloalkyl,R.sub.3 is C.sub.1 -C.sub.8 alkyl or C.sub.5 -C.sub.6 cycloalkyl,R.sub.4, R.sub.5 and R.sub.6, independently of one another, are hydrogen or C.sub.1 -C.sub.4 alkyl, when alkyl, R.sub.4, R.sub.5 and R.sub.6 together containing 1 to 4 carbon atoms, andR.sub.7 and R.sub.8 are hydrogen or together an additional direct bond, are described for use as stabilizers for organic materials against thermal, oxidative or light-induced degradation.

Abstract: Carbohydrate substituted dibenzo[d,f][1,3,2]dioxaphosphepin compounds of formula I ##STR1## where A is a carbohydrate residue are effective stabilizers for polymers processed at elevated temperatures and subject to thermal or oxidative degradation.

Abstract: A process for producing a (co)polycarbonate or a (co)polyestercarbonate having a high molecular weight and excellent hue, heat stability and mechanical properties by reacting a dihydroxyl compound with a diester of carbonic acid and/or a diester of dicarbonic acid in the presence of a transesterification catalyst, wherein at least part of the reaction process is conducted in the presence of a specified organic phosphorus compound, or, in the presence of a specified organic phosphorus compound and a hindered phenol compound. A (co)polycarbonate or (co)polyester-carbonate composition having excellent hue, heat stability and mechanical properties, comprising a (co)polycarbonate and/or a (co)polyestercarbonate and, a specified organic phosphorus compound, or, a specified organic phosphorus compound and a hindered phenol compound.

Abstract: A process for producing a (co)polycarbonate or a (co)polyestercarbonate having a high molecular weight and excellent hue, heat stability and mechanical properties by reacting a dihydroxyl compound with a diester of carbonic acid and/or a diester of dicarbonic acid in the presence of a transesterification catalyst, wherein at least part of the reaction process is conducted in the presence of a specified organic phosphorus compound, or, in the presence of a specified organic phosphorus compound and a hindered phenol compound. A (co)polycarbonate or (co)polyester-carbonate composition having excellent hue, heat stability and mechanical properties, comprising a (co)polycarbonate and/or a (co)polyestercarbonate and, a specified organic phosphorus compound, or, a specified organic phosphorus compound and a hindered phenol compound.

Abstract: Carbohydrate substituted dibenzo[d,g][1,3,2]dioxaphosphocin compounds of formula I ##STR1## where A is a carbohydrate residue are effective stabilizers for polymers processed at elevated temperatures and subject to thermal or oxidative degradation.

Abstract: A dibenzo-[c,e] [1,2] oxaphosphorine of the formula I and process of making said compound ##STR1## wherein n=1 or 2 and in which R.sup.1 is a monovalent or divalent aromatic radical wherein a Grignard compound R.sup.1 (MgHal).sub.n is reacted with 6-chloro-6H-dibenzo[c,e][1,2] oxaphosphorine.This compound optionally with phenolic antioxidants, provides stabilization in polymers.

Abstract: New phosphorous organic amides of a specific formula and their use as stabilizers for polymers and, other organic materials.

Abstract: Smoke suppressed flame retardant thermoset resin compositions comprise smoke suppressant bicyclic phosphate compound(s), flame retardant(s) and unsaturated polyester or other thermoset materials. These compositions exhibit a reduced tendency to smoke under conditions of burning.

Abstract: The crystalline synthetic resin composition of the present invention comprises 100 parts by weight of a crystalline synthetic resin compounded with (a) 0.01 to 5 parts by weight of at least one of alkali-metal carboxylates, alkali metal .beta.-diketonates and alkali metal salts of .beta.-ketoacetic esters and (b) 0.01 to 5 parts by weight of at least one of basic polyvalent metal salts of cyclic organophosphoric esters of the following general formula (I): ##STR1## wherein R.sub.1 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, R.sub.2 and R.sub.3 each represent a hydrogen atom or an alkyl group having 1 to 12 carbon atoms, M represents a group III or IV metal atom of the periodic table, and X represents HO--when M represents a group III metal atom of the periodic table and X represents 0.dbd. or (HO).sub.2 --when M represents a group IV metal atom of the periodic table. The compositions can be used for packaging materials, and coated molded articles.

Abstract: A composition, having good weatherability properties, comprisinga) one or more compounds of formula I ##STR1## in which m is 1;n is 0 or 1;p is 0;each R or R.sup.1 independently, is a group derived from an aliphatic, alicyclic or aromatic alcohol containing one or two OH groups; whereby the two --OH groups are not positioned to be able to form a P-containing ring;or both groups R form a group derived from an aliphatic, alicyclic or aromatic alcohol containing two OH groups in such a position that they can form a cyclic group with a single phosphorus atom;Y is --O--, --S--, --CH(R.sub.5)-- or --C.sub.6 H.sub.4 --;where R.sub.5 is hydrogen or C.sub.1-8 alkyl or COOR.sub.6 and R.sub.6 is C.sub.1-8 alkyl; andb) a polymeric material.

Abstract: A polymer composition having a good balance of improved mechanical properties and optical properties such as low haze, which comprisesa) propylene-butene random copolymer,b) at least one additive, andc) a clarifying agent which is calcium montanate, at least one polyolefin wax or combinations thereof.

Abstract: A polypropylene resin composition which is excellent in transparency and which shows very low pH reduction of the extract obtained in a promoted hot water-extraction test of a polypropylene resin which has been irradiated with radiant rays for sterilization. The polypropylene resin composition comprises 100 parts by weight of a polypropylene resin, 0.01 to 1.0 part by weight of a metal diarylphosphate represented by the following general formula (I): ##STR1## (wherein R.sub.1 and R.sub.2 each represents a hydrogen atom or an alkyl group; M represents an alkali metal or an alkaline earth metal; n is an integer of 1 or 2; and A represents an alkylidene group); and 0,001 to 1.0 part by weight of a hydroxide of an alkali metal, an alkaline earth metal or an element of the aluminum group. The polypropylene resin composition is suitable for use in making medical instruments, containers for foods or the like.

Abstract: Phillips' process high density polyethylene resin compositions having improved processing stability are obtained using a combination of stabilizers comprised of a hindered phenol and a phosphite compound having three cyclic phosphite moieties linked via a nitrogen atom. More specifically, the phosphite compound is 2, [[2,4,8,10-tetrakis(1,1-dimethylethyl)dibenzo[d,f][1,3,2]-dioxaphosphepin- 6-yl]oxy]-N,N-bis [2-[[2,4,8,10-tetrakis (1,1-dimethylethyl) dibenzo[d,f][1,3,2]dioxaphosphenpin-6-yl]oxy]-ethyl]ethanamine. With the HDPE compositions stabilized in accordance with the invention, it is possible to eliminate undesirable rapid changes in melt viscosity which can occur when Phillips' process HDPE resins are processed under conditions of high shear.