Butadiene-styrene-methyl methacrylate

MBS = methyl methacrylate—butadiene—styrene and MABS = methacrylate-acrylonitrile—butadiene—styrene. 

There are various requirements for impact-modified PVC. The most demanding is for outdoor sidings and window frames, where lifetimes of 20 years are expected. Because butadiene polymers or copolymers (e.g., acrylonitrile/butadiene/styrene (ABS), methyl methacrylate/butadiene/styrene (MBS)) are susceptible to UV degradation these polymers are usually not employed instead acrylate polymers are used for these applications. 

MBS (methyl methacrylate-butadiene-styrene) graft copolymers are known as one of the most efficient non-reactive impact modifiers for PET and also poly(vinyl chloride) (PVC). MBS is used commercially as an effective impact modifier for PET recyclate [27], Typical MBS rubber particles contain an elastomeric core of... 

MBS methyl methacrylate butadiene styrene copolymer blend... 

Methyl methacrylate-butadiene-styrene (MMBS) types are rarely used as such, but rather in blends as impact modifiers (1). Styr-enic copolymers such as acrylonitrile-butadiene-styrene (ABS) and MMBS make up the largest category of impact modifiers, with about 45% of the impact modifier market (2). The field of polymer blends and the reasons for the addition of impact modifiers have been reviewed (3). 

R.R. Clikeman, D.H. Jones, T.J. Shortridge, and E.J. Troy, Methyl methacrylate-butadiene-styrene impact modifier polymers, polyvinyl chloride, compositions and methods, US Patent 4 379 876, assigned to Rohm and Haas Company (Philadelphia, PA), April 12,1983. 

Comparison of Methyl Methacrylate-Butadiene-Styrene with Acrylonitrile-Butadiene—Styrene Graft Copolymers... 

This study was therefore undertaken to prepare and evaluate acrylonitrile—butadiene-styrene (ABS) and methyl methacrylate-butadiene-styrene (MBS) polymers under similar conditions to determine whether replacement of acrylonitrile by methyl methacrylate could improve color stability during ultraviolet light aging, without detracting seriously from the good mechanical and thermal-mechanical properties of conventional ABS plastics. For purposes of control, the study also included briefer evaluation of commercial ABS, MBS, and acrylonitrile-butyl acrylate-styrene plastics. 

Phenolic products, especially sterically hindered phenols, are widely used throughout the PVC industry - for instance, as chain-stoppers and antioxidants in PVC polymerisation, to terminate the reaction and prevent degradation of the virgin resin in the stripper and dryer. Methyl methacrylate butadiene-styrene (MBS), a frequently used impact modifier for rigid PVC, needs highly efficient protection against oxidative degradation... 

A few plastics which tend to be naturally brittle require an improvement in both their drop (impact) strength and their top loading (compression) strength. In the case of polystyrene, rubber is widely used as an impact modifier. Rigid PVC, particularly when used as a container, may suffer weakness when subjected to, say, a 3 4 foot drop test. Up to 15% of methyl methacrylate butadiene styrene (MBS) copolymer is usually added to improve impact strength. Chlorinated polyethylene has more recently been introduced as a PVC impact modifier. Vinyl acetate is frequently used as a modifier for PVC film. Polythene, LDPE-HOPE can have resistance to stress (environmental stress cracking), improved by the use either of rubber or polyisobutylene. These modifications have not as yet had any pharmaceutical applications. 

Polyvinylchloride is rigid, transparent and, although it lacks the sparkle of poly styrene, is less brittle. Drop strength can be improved by the use of an impact modifier such as vinyl acetate or methyl methacrylate butadiene styrene (MBS). PVC is moderately permeable to moisture but has excellent resistance to oil and oxygen permeation. Plasticised PVC has high flexibility and is particularly useful when a collapsible pack is required. It is a poor barrier to moisture and a moderate barrier to gases, hence is usually overwrapped . 

A transparent rigid vinyl bottle compound is produced by blending PVC homopolymer with a methyl methacrylate/butadiene/ styrene graft polymer of equal refractive index. 

Weather-resistant ABS can be obtained either by the incorporation of EVAc [Fukushima and Mitarai, 1971], or by replacing PB with EPDM, to obtain AES [Wefer, 1984, 1985, 1988]. Alternatively, blends of SAN with maleated EPDM and CPE may be used [JCim et al., 1994]. However, the non-weatherable styrenics are frequentiy prepared by dissolving an elastomer in methyl methacrylate, and either styrene or a-methylstyrene, then polymerizing them into methyl methacrylate-butadiene-styrene graft copolymers... 

Methyl methacrylate-butadiene-styrene-a-methylstyrene, for weather resistance Butadiene-styrene-methylacrylate-ethylacrylate (ASA)... 

MBS Methyl methacrylate-butadiene-styrene PVDC Poly(vinylidene chloride)... 

Low Density Polyethylene High Density Polyethylene P o1ypropy1ene Polyvinyl Chloride Polyacetal Polystyrene Expanded Polystyrene Methyl methacrylate butadiene styrene terpolymer Phenol Formaldehyde Melamine Formaldehyde Urea Formaldehyde On-stream mid-1993... 

Methyl methacrylate-butadiene-styrene, impact modifier 20... 

Poly(vinyl chloride) (PVC) homopolymer is a stiff, rather brittle plastic with a glass temperature of about 80°C. While somewhat more ductile than polystyrene homopolymer, it is still important to blend PVC with elastomer systems to improve toughness. For example, methyl methacrylate-butadiene-styrene (MBS) elastomers can impart impact resistance and also optical clarity (see Section 3.3). ABS resins (see Section 3.1.2) are also frequently employed for this purpose. Another of the more important mechanical blends of elastomeric with plastic resins is based on poly(vinyl chloride) as the plastic component, and random copolymers of butadiene and acrylonitrile (AN) as the elastomer (Matsuo, 1968). On incorporation of this elastomeric phase, PVC, which is ordinarily a stiff, brittle plastic, can be toughened greatly. A nonpolar homopolymer rubber such as polybutadiene (PB) is incompatible with the polar PVC. Indeed, electron microscopy shows... 

Uses Emollient emulsifier syn. lubricants bar soaps cosmetics rubber tires emulsifier for polymerization of SBR, ABS, methyl methacrylate-butadiene-styrene polymers lubricant, binder, defoamer for foods component of other food additives in food-pkg. adhesives in paper/paperboard in contact with aq./fatty foods defoamer in food-contact coatings and paper/paperboard food-contact textiles... 

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