Heat stabilizers: product lines reviewed.

HEAT STABILIZERS PRODUCT LINES REVIEWED

ADELL PLASTICS, INC.

Heat stabilizer concentrates are available on a custom and proprietary basis from this custom compounder specializing in engineering thermoplastics. Concentrates of other additives, including multifunctional concentrates containing more than one type of additive, are also available.

AKZO CHEMICALS INC.

Manufactures a complete line of metallic-based products. Company's Interstab and Stanclere lines of stabilizers have been formulated to satisfy a wide range of processing techniques including calendering, extrusion, injection molding, and various plastisol operations.

Barium/cadmium/zinc stabilizers for general-purpose flexible PVC applications are offered. These relatively odorless stabilizers reportedly provide exceptional initial color as well as excellent heat and light stability. Air-release and dry-blending characteristics are said to be excellent, as is resistance to viscosity buildup and plateout.

A noncadmium-containing series of Interstab products is also available to satisfy a wide range of processing requirements. They are efficient liquid barium-zinc complexes that impart exceptional thermal and dynamic stability.

Company also produces a complete series of high-performance organotin stabilizers for rigid PVC under the Stanclere name. They reportedly offer excellent long-term heat stability and early color control, plus improved dynamics, and are available in liquid or solid form, either mercaptide or sulfur-free. These include a unique series of estertains for pipe, siding, FDA bottles and other rigid applications. They are said to give cost/performance superior to other organotins.

Nontoxic calcium/zinc stabilizers are offered for food-contact PVC. These are especially designed for rigid or flexible compounds and are available in solid, paste and liquid form. They are generally used with phosphite chelators and epoxy secondary plasticizers.

Company's organophosphite auxiliary stabilizers are designed for both FDA-sanctioned and general-purpose uses. Major advantages reportedly include improved early-color control and long-term stability.

AKZO ENGINEERING PLASTICS

Offers heat and light stabilizer systems in concentrate form. Heat-stabilizer compositions for rigid vinyl house siding and contour shapes are available in multifunctional concentrates.

ALLIED PRODUCTS CORP.

See Coz Div.

ANZON LEAD

SYNTHETIC PRODUCTS CO.

Supplies a full line of lead stabilizers. These are organic/inorganic, normal or basic salts of lead. They are effective in controlling degradation of halogen-containing polymers such as PVC. Lead salts are pigmentary, offer superior heat stability, impart excellent electrical properties, give good outdoor weatherability, activate azodicarbonamide-type blowing agents, and are synergistic with epoxy plasticizers. Major applications are wire and cable, outdoor rigid PVC pipe, plastisols and records.

Lead-based stabilizers are available in five family types, including carbonates, sulfates, phthalates, phosphites and co-precipitates. Selected grades are available in oiled and nondusting grades. Product is available in PVC bag packaging or semi-bulk containers, reportedly aiding processors in meeting OSHA and EPA requirements.

Also available is a line of encapsulated lead stabilizers. Unlike granular and pelletized lead stabilizers, these products are said to be readily incorporated and dispersed with conventional PVC mixing equipment. Encapsulated stabilizers are available in lead carbonate, sulfate and phthalate grades to reduce generation of dust during handling and compounding.

ARGUS DIV.

See Witco Corp.

ATOCHEM NORTH AMERICA INC.

A complete line of organotin stabilizers is offered for rigid PVC. Thermolite 175, 175C, 310, 310C are liquid organic stabilizers; Thermolite System 4 is a multifunctional stabilizer-lubricant recommended for PVC pipe extrusion. Thermolite 176, based on a newly developed tin technology, is a part-for-part replacement for Thermolite 175C and Thermolite 310C. Superior cost/performance, color hold, and odor are among Thermolite 176's reported advantages.

Thermolite T-133 and T-137 are suggested for injection molding, while T-137, T-34, and T-31 Super are offered for siding and profiles. Thermolite T-149 is designed for foam profiles. Thermolite 31 is used in every process (profile, sheet, pipe) as well as any PVC or CPVC polymer or copolymer.

For rigid PVC containers and extruded sheet, company recommends Thermolite-31, -66, -108, depending on formulation and equipment variables. New general-purpose bottle stabilizers with improved cost/performance are in development.

Thermolite-350 and other customized organotin maleate stabilizers are recommended for calendered rigid PVC film/ sheet where resistance to sulfide staining is required. Other tin mercaptides are available for applications not requiring sulfide stain protection.

A new line of radiation and heat stabilizers for PVC medical devices and packaging is said to offer resistance to color degradation and loss of physical properties upon exposure to gamma irradiation.

Thermolite 831 and 813 remain the major stabilizers for use in food-grade bottle and sheet applications. The company also has new octyltins based on a mono-octyltin derivative approved by FDA.

CARDINAL STABILIZERS, INC.

A complete line of low-cost, liquid organotin stabilizers for PVC is offered. CC-7711, CC-7711A and CC-7712 for rigid pipe and profiles are said to show excellent cost-performance. CC-101-110 and CC-101FC are products with reportedly superior cost-performance and excellent color hold for high-quality injection molding. CC-1015M is designed for siding and window profiles. CC-11 can be used in many processes but is particularly recommended for high-gloss sheet extrusion. For general-purpose rigid PVC bottles and containers, company recommends its CC-400 series of stabilizers.

CIBA-GEIGY CORP.

ADDITIVES DIV.

Offers Irgastab T-265 octylin mercaptide for food-grade PVC, such as bottles. Irgastab T-634 tin carboxylate is said to be particularly effective when used with a light stabilizer in dark PVC siding.

COZ DIV.

ALLIED PRODUCTS CORP.

Concentrates containing heat stabilizers can be supplied in PS, polyolefins and most other thermoplastics.

EAGLE-PICHER INDUSTRIES INC.

CHEMICALS DIV.

Offers EPIstatic lead stabilizers for PVC, including tribasic lead sulfate, basic lead silico-sulfate, and dibasic lead phthalate. These materials are also available with organophilic surface modification to improve dispersion and reduce energy requirements during processing. Nondusting grades are also offered. EPIstatic products are used as the primary stabilizers in both rigid and flexible PVC and in PVC foams. Superior stabilization large part to their having a higher specific surface than other products of this type.

FAIRMOUNT CHEMICAL CO. INC.

Mixxim T-18 and T-15 are proprietary organotin stabilizers for halogenated flame retardants in polyolefins or styrenics.

FERRO CORP.

BEDFORD CHEMICAL DIV.

A full range of Therm-Chek mixed metal heat stabilizers are available for the entire range of rigid and flexible PVC applications and processes. An increasing range of noncadmium mixed metal liquid, powder or past heat stabilizers is available and gaining rapid commercial acceptance in various flooring, wall covering, packaging, and automotive applications. Many products are custom designed to meet specific customer needs.

A specialty line of Therm-Chek organotin stabilizers is offered for many PVC, ABS/PVC, and other polymer blend applications.

HALSTAB DIV.

HAMMOND LEAD PRODUCTS INC.

Lead stabilizers for PVC include lead sulfates, phthalates, carbonates and co-precipitate complex types - all in lubricated and nonlubricated forms. Specific areas of use are wire and cable, rigid and flexible profiles, conduit, nonpotable pipe, foam, rigid and flexible sheet or moldings, plastisols, organosols and weather-resistant applications.

HARWICK CHEMICAL CORP.

Produces plasticizers and PVC-based concentrates of various heat stabilizers.

HENKEL CORP.

CHEMICAL SPECIALTIES DIV.

Offers calcium/zinc heat stabilizers in its Stabiol line. Stabiol calcium/zinc heat stabilizers are well suited for PVC rigid packaging containers intended for food contact applications such as bottles for drinking water.

HULS AMERICA, INC.

Offers a line of PVC stabilizers, including barium/cadmium/zinc phosphite complexes used commonly in coatings, film, sheet, molding, and extrusion. A complete line of cadmium/zinc stabilizers is also produced for FDA-sanctioned applications.

LUBRIZOL CORP.

Offers Lubrizol 2106 overbased barium phenate for use as a PVC heat stabilizer. Product features high barium metal content in liquid form without the use of volatile solvent.

Lubrizol 2116 is an overbased barium carboxylate complex. Also in liquid form, it provides a typical 34% barium metal content in a light amber color.

Lubrizol 2117 is an overbased liquid calcium carboxylate which has a light color and is free of any toxic components. Studies indicate that 14% calcium, Lubrizol 2117 offers significant formulating advantages in the development of liquid calcium-containing stabilizer packages. The product is in compliance with FDA regulations for indirect food contact.

MRS CHEMICALS INC.

PVC stabilizers are offered in both powdered and liquid form for standard as well as nontoxic applications in plastisols, calendered films and other compounds. Special stabilizers are available for mechanically frothed or chemically blown foams. Stabilizers are also available, either to retard or accelerate chemical blowing agents such as azodicarbonate.

MORTON INTERNATIONAL, INC.

SPECIALTY CHEMICALS GROUP

A complete line of organotin heat stabilizers for rigid PVC is offered. Advastab TM-181 is a high-performance stabilizer for siding, profiles, injection and blow molding. Other grades include TM-692 for pipe; TM-694 low-cost heat stabilizer for pipe; TM-604 for injection molding; and TM-948 for general-purpose bottles.

Advastab TM-2080 is a high-performance, FDA-approved stabilizer for rigid PVC in food-contact applications. A "one-pack" multifunctional lubricating stabilizer, Advastab LS-203, is recommended for high-output PVC pipe production on twin-screw extruders.

REED PLASTICS DIV.

SANDOZ CHEMICALS CORP.

Offers custom-formulated, heat-stabilizer concentrates for thermoplastics molding and extrusion. Also available are multifunctional concentrates containing both heat stabilizers and colorants. The concentrates are available in pellet form.

SHEPHERD CHEMICAL CO.

Manufactures cuprous iodide for stabilizing nylon and cerium octoate (2-ethyl-hexanoate) for silicon rubber, PVC, lubricants, and various polymer formulations.

SYNTHETIC PRODUCTS CO.

A complete line of PVC heat stabilizers is available, including various combinations of barium, cadmium and zinc, custom designed for flexible PVC, including plastisols and organosols.

For rigid PVC, a complete line of antimony mercaptides is offered for pipe. Products include antimony-based stabilizers, said to have an economic advantage over tins; a line of new high-efficiency barium/cadmium powders with improved early color for outdoor use; a complete line of organotins for general-purpose bottles; and a full complement of nontoxic calcium/zinc and unique calcium/stannous/zinc powders and pastes for food-contact use.

Also offers dispersions of lead, barium, cadmium, tin and zinc-based compounds as concentrates or as pumpable pastes for automatic metering.

UNIROYAL CHEMICAL CO. INC.

Produces the following amine-based products: Naugard BG, a diarylamineketone reaction product for nylon 6, said to protect polymer from loss of physical properties and to impart exceptional flex resistance. Naugard A, a diphenylamine-acetone reaction product is similar in type and function to the above, but offers a slight economic advantage. Naugard J, an N,N'-diphenyl-p-phenylene-diamine, is a long-term heat stabilizer recommended for use in polyolefin applications when color is not critical.

R.T. VANDERBILT CO., INC.

One of the oldest stabilizer manufacturers in the U.S., company's Vanstay PVC heat stabilizers constitute a line of custom-formulated combinations of barium, cadmium, calcium, and zinc. Company also offers a complete line of FDA-sanctioned PVC heat stabilizers.

WITCO CORP.

ARGUS DIV.

Mark stabilizer line includes solid barium/cadmium and liquid barium/ cadmium/phosphites for clear and pigmented, flexible and semirigid PVC, as well as plastisols, organosols and vinyl solutions.

Organotins include butyls, methyls and octyls, solids and liquids, sulfur and nonsulfur types for both high-impact and unmodified rigid compounds, including weather-resistant systems. These materials go into bottles, water pipe, fittings, siding, rigid foam and profiles.

Special zinces include calcium/zinc and barium/zinc combinations in liquid and solid form. Barium/leads are offered for wire and cable and record compounds. Noncadmium types, such as special zinc liquid systems, are available for applications where absence of cadmium is desired.

FDA-regulated stabilizers include octyltins, methyltins, calcium/zincs and phosphites for food-wrap films, beverage bottles and vacuum-formed sheet. Phosphites are also offered for use as auxiliary stabilizers with barium/cadmium and calcium/zinc systems.

Special-purpose systems include one-package stabilizer/antifog additives for meat and produce wrap, additives for meat and produce wrap, stabilizer/ activators and cell stabilizers for plastisol and calendered foams, and flooring stabilizers.

Antimony-based stabilizers for more economical stabilization of rigid PVC, are also offered for use in pipe and conduit.

ZINC CORPORATION OF AMERICA

Zinstable line of zinc-based foam activator/ stabilizers is offered in powdered form for use in calendered PVC and plastisol foams. They are said to combine heat and uv stabilization with catalytic activation of chemical blowing agents such as azodicarbonamide. Zinstabes reportedly control rate of cell formation and provide overblow protection. Further, they reportedly contain no heavy metals such as lead or cadmium and are consequently not prone to sulfide staining.