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Impact modifiers: product lines reviewed.


Manufactures a line of liquid 1,2-polybutadienes and 1,2-polybutadienestyrene copolymers for use as low-temperature impact modifiers in polyolefins, styrenics and TPE. Called Ricon, products have application in PP, peroxide-cured PE, as crosslinking polymers, and also in TPE.


Amoco polybutene improves impact resistance of many types of thermoplastics,

including crystal PS, high-impact PS, PP homopolymer, and elastomer-modified PP. Polybutenes are clear and stable viscous polymers with low odor and resistance to thermal degradation, making them suitable for use in thermoplastics. Products are available in a wide range of viscosity grades.

In PS, polybutenes can improve impact resistance and melt flow. When used in place of mineral oil, physical properties of PS are less affected and there is an improvement in the impact resistance.

In modified PP and in resin that has been modified with a thermoplastic elastomer (TPE), polybutenes are said to dramatically improve impact resistance. This suggests that polybutenes may be used to enhance impact strength and partially replace more expensive TPE.


See Elf Atochem North America Inc.


Company says it's the largest producer of ground rubber in the U.S., recycling car and truck tires into materials that can be used to modify plastics. Granulite products come in a variety of particle sizes down to minus 40 mesh and priced in a range of 12-20 lb. They can be used as flexibilizers, anti-skid additives, extenders, and potentially as impact modifiers. Company also plans to introduce pelletized masterbatches of ground rubber in a thermoplastic vehicle.


Manufactures several types of elastomers for use in improving the impact resistance of a variety of thermoplastic resins. EPsyn brand EPDM is used for olefinics, NYsyn brand NBR and COPO brand SBR for styrenics. NYsynblak brand NBR black masterbatches are used as combination impact modifiers/black concentrates for ABS.

Company's Customer Applications Development Center can provide technical service assistance and compound recommendations for both impact modification and thermoplastic elastomers.


Partnership of Exxon Chemical and Dow Chemical, Dexco has introduced seven grades of its Vector series styrenic block copolymers that double as compatibilizers and aid in alloying dissimilar plastics. Company's proprietary technology reportedly allows an unprecedented level of control over polymerization. It can achieve 100% conversion to triblock copolymer, eliminating uncoupled diblock that can adversely affect the tensile strength and elastic modulus of a neat polymer, as well as cause a negative effect on the degree of compatibilization of dissimilar materials. The process also makes it easier to predict molecular weights and eliminates the byproduct production of halide salts, cutting out the risk of future discolorization or property degradation. The process also makes it feasible to tailor the polymer block interfaces, opening up the possibility of improving blending compatibility with other polymers.

Dexco is developing a Vector 6000 series of SBS copolymers for modifying polyolefins, styrenics, engineering thermoplastics, recycle blends and alloying.


Offers chlorinated polyethylene (CP), which is used as a weatherable modifier for rigid vinyls.


Company's toughening technologies involve four major families of modifiers: ethylene terpolymers, ionomers, grafted polyolefins, and elastomers. This broad range of technologies is key in optimizing compatibility between modifier and base polymer.

Ethylene terpolymers provide impact resistance over a broad temperature range and particularly at low temperatures for a wide variety of thermoplastics and thermosets. In thermoplastics, ethylene terpolymers are said to offer excellent potential for improving the impact resistance of PVC, ABS, SAN, SMA, thermoplastic polyesters (including recycled materials) and polycarbonate. In PVC they offer two key benefits in addition to higher impact: improved weatherability and easier processing resulting from a reduction in melt viscosity. Weatherability is also improved in ABS. Thermoset applications include phenolics, polyesters and epoxies.

Company's Surlyn ionomer resins provide low-temperature impact properties in nylon 6. In TPOs, ionomers enhance abrasion resistance and paintability.

In reinforced PP and PE compounds, company's Fusabond anhydride-grafted polyolefin modifiers improve toughness by increasing adhesion between reinforcements and the resin matrix. Another polyolefin, VLDPE (very low-density PE), has potential as a low-cost toughener for filled and recycled PE materials.

In SMC and BMC, company's Neoprene rubber functions as both a low-profile additive and impact modifier.


Offers its Metablen C series of MBS impact modifiers for use with rigid PVC products. A patented manufacturing process reportedly ensures consistency from lot to lot, guaranteeing a quality impact modifier that contributes to the uniformity of PVC compounds. Products are sanctioned by FDA as an additive for food-grade PVC. Each product is designed for specific applications, with no detrimental effect on heat stability, and are low in gels. Metablen C products are packaged in 20-kg polyethylene-lined bags, palletized. Company also offers Durastrength 200 weatherable all-acrylic modifier for rigid PVC.


Manufactures Expancel expandable thermoplastic microspheres used as blowing agents and low-density fillers. Areas of application for Expancel as an impact modifier are thermosets, coatings and elastomers.

Expancel microspheres create a syntactic foam with defined pore size, closed-cell structure and resilient voids. The resilient nature of Expancel allows deformation without breakage, thereby improving impact resistance and reducing stress. Further applications are found in elastomeric materials where the resiliency of Expancel improves compatability between filler and binder material.


Company's Exxelor brand modifiers are a family of polyolefin-based polymers, which can be used to improve the end-use performance of a variety of thermoplastic resins. Exxelor modifier grades are available to improve both low-temperature impact down to -40 F and room-temperature impact properties.

A group of products in this family are functionalized and can be used to modify engineering thermoplastics, polyolefins, glass-reinforced and filled compounds, and alloys or blends of engineering thermoplastics and polyolefins.

Exxelor modifiers reportedly possess excellent thermal stability and long-term heat and weathering resistance, and can be used as modifiers and compatibilizers for engineering thermoplastics.

Two new grades, PO 2011 and PO 2021, have been added to the Exxelor family. Developed to improve the impact and heat-distortion performance of mineral- and glass-reinforced PP compounds, they reportedly act as compatibilizers in blends of PP and nylon. At levels between 3% and 5%, the new grades are said to improve heat-distortion temperature of reinforced PP by up to 45|degrees~ F. Both modifiers can be used as compatibilizers in homopolymer and copolymer blends of PP and nylon up to a 50:50 ratio.

Company's new Bromo XP-50 elastomers have potential applications in plastics impact modification and blend compatibilization. They are said to be unique brominated copolymers of isobutylene and paramethylstyrene and to have good ozone resistance and heat stability, as well as chemical reactivity. Modifications have potential as reactive low-temperature flexibilizers and impact modifiers for urethanes, epoxies, nylon, PPO, TP polyesters, and other engineering thermoplastics. The ability of the rubbers to graft to many polymers, including PS and PP, suggests uses in dynamically vulcanized TP elastomer alloys and also as compatibilizers for polymer blends.


Company's Stereon line of block copolymers of styrene and butadiene are used for impact modification of thermoplastic resins. Stereon 721A and 730A are effective graft bases for impact enhancement of high-impact PS and ABS. Products are available in baled form and are usually incorporated directly into the polymerization stream. Stereon 840A is a pelletized, multiblock copolymer that, when dry-blended with PS, PP or PE resins, will improve impact, flexibility, and tear strength. Stereon 840A can be used to upgrade regrind streams and provide impact improvement for degradable plastics. Stereon 900 is a high-styrene, pelletized copolymer designed to be dry-blended with 40-50% crystal PS for extrusion and thermoforming of disposable drinking cups, packaging and medical devices.


Produces the following impact modifiers for PVC and other resins:

* Blendex 336 and Blendex 338 are high-efficiency ABS impact modifiers that contain a high percentage of rubber. Blendex 336 provides transparency and is also used in specialty PVC applications where a high degree of stress whitening is desired. Blendex 338 is more efficient than 336 and provides the best low-temperature toughness.

* Blendex 405, 424 and 467 are ABS modifiers designed to toughen the polymer without detracting from its optical properties. While used primarily in clear PVC film and bottles, it can also be used in engineering thermoplastics. In addition to PVC, Blendex products can be used to modify and toughen other polymers such as polycarbonate and polyesters.

* Blendex 702 and Blendex 703 are high-heat impact modifiers based on alpha methyl styrene and are used to upgrade PVC compounds and other polymers having marginal service temperature performance.


Produces MBS/acrylic impact modifiers with the following reported properties:

* B-11A--Low impact, excellent clarity, noncrease-whitening.

* B-18A-1--Medium impact, high clarity.

* B-22--High impact, high clarity.

* B-28--Excellent impact, medium clarity.

* B-31--Medium impact, excellent clarity, noncrease-whitening.

* B-51--Excellent impact, excellent L clarity.

* B-56--Ultra-high impact, translucent, stress-whitening.

* B-58--Ultra-ultra-high impact, translucent.

* B-513--Ultra-clear, noncrease-whitening, good impact.

* B-521--Ultra-high impact, excellent clarity, noncrease-whitening.

* B-522--Excellent impact, high clarity, good melt flow.

* FM-10--Acrylic, weatherable, good impact, low gloss.

* FM-20--Acrylic, weatherable, excellent impact, low gloss.

* FT-80--Acrylic, semi-weatherable, excellent impact, good melt flow.

* M-511--Opaque, high-impact, injection molding grade.

* M-521--Opaque, high-impact, injection molding grade.

* XB-38-A--Clear, oil-resistant grade for bottles.


Baymod A, ABS powder modifiers, including products for both rigid indoor and exterior weatherable applications, provide improved impact resistance and heat distortion temperatures for PVC alloys used for injection molding and extrusion. Typical applications include business-machine housings, profile extrusions, and semi-flexible or rigid calendered thermoformable sheets.

Baymod ethylene vinyl acetate copolymers can be used as weatherable impact modifiers for rigid vinyl extrusions such as window profiles, or as "permanent plasticizers" for flexible compounds that require improved extraction resistance and aging properties.

Company has developed experimental grades of ethylene-propylene elastomers. Polysar EPM XF 004 is an elastomer designed to improve flow characteristics and gloss in automotive polyolefin blends and provide impact-modified PP and TPOs with better surface characteristics and gloss. The other elastomer, EPDM XG 006, is reportedly the first pelletized, oil extended synthetic rubber, and is intended for use in TPOs requiring low stiffness and high flow. Company says its most unique property is its use of parafinic oil with only 0.5% aromatic content--a factor that improves uv and oxidation resistance and color integrity.


See Miles Inc.


Produces impact modifiers for ABS, HDPE, PP, PVC, and PS/ABS blends.

Novalene, an EPDM rubber, is suitable for use by molders and compounders of PP and PE, and comes in a convenient dry-blending form. Company reports that the addition of Novalene in the prescribed amount, even to scrap, can raise Izod levels to the no-breaking point, even at very low temperatures. In general the Izod impact strength of pure Novalene is no-break at -20 F.

Novalor is a high-butadiene ABS powder for PVC and gives added impact strength and processability with less loading, according to the company.

Novalor P, a high-rubber-graft impact modifier for use with ABS and PVC, is manufactured in a free-flowing pellet concentrate that reportedly disperses adequately in single-screw extruders and allows compounders to incorporate rubber into SAN to formulate their own ABS materials.


Company's Plastics Products business offers the Paraloid family of impact modifiers for vinyls and engineering plastics that includes:

* Paraloid KM-300 series--all-acrylic line of weatherable impact modifiers for vinyl extrusions subjected to outdoor exposure.

* Paraloid BTA series--MBS impact modifiers for toughness in PVC sheet, film and containers used in clear or opaque packaging.

* Paraloid HT series--acrylicimide-based modifiers for improvements in heat distortion properties of both clear and opaque vinyl.

Also offered is a wide product range of Paraloid EXL impact modifiers designed for engineering resins. Included in the range are:

* EXL-3300 series--butyl-acrylate-based tougheners for polyesters and blends, PC and nylons.

* EXL-3600 series--MBS-based impact modifiers with high thermal stability for PC, PET, PBT, and blends.

* EXL-4000 series--imide-methacrylate products for blending with nylons, PC, SAN, ABS and polyesters.


Company's Elastomers Business Center provides a diversity of SBS and SEBS block copolymers for impact modification of PS, engineering thermoplastics and alloyed products.

SBS Kraton D polymer series is used for impact modification of polycarbonates, PPO, and polyolefin blends. Kraton G 1901X, a functionalized polymer, is used for impact modification of engineering thermoplastics and for making polar and nonpolar polymers compatible. SBS and SEBS polymers are also available in specific grades as low-profile additives for production of BMC and SMC parts; Kraton G 1855X provides a class-A automotive finish. Developmental polymer products are available for sampling the modification of materials.


Produces several types of specialty synthetic rubbers, which include Nipol nitrile rubber (NBR), Zetpol hydrogenated nitrile rubber (HNBR), Hytemp polyacrylate (ACM), Hydrin epichlorohydrin (ECO) and Parel propylene oxide polymer (PO).

Specific grades are tailored for use as impact modifiers, plasticizers, processing aids and lubricants. Typical resins using these additives include flexible and rigid PVC, ABS, nylon, TPEs, blends/alloys, epoxies and phenolics. Applications include calendered and extruded PVC, wire and cable, pipe, molded machine housings, aerospace and industrial composites, and friction products.
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Title Annotation:plastics industry
Publication:Plastics Technology
Article Type:Buyers Guide
Date:Jul 15, 1992
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