Methyl methacrylate copolymer transparent, impact-resistant

Transparent, Impact-Resistant, Styrene/ Methyl Methacrylate Copolymer Grafted onto Polybutadiene... 

In 1991, the production of methyl methacrylate was 1.84 million tons per year [41]. The United States, Western Europe, and Japan produced 0.66, 0.54, and 0.46 million tons per year, respectively [42], The cost for methyl methacrylate in 1991 was 0.62/lb [43]. Most acrylics start with methyl methacrylate monomer (MMA). Methyl methacrylate is used in the production of poly(methyl methacrylate) and in copolymers to improve the impact resistance of other vinyl polymers [44], Poly(methyl methacrylate) is a colorless transparent plastic with a higher softening point, better impact strength, and better weatherability than polystyrene [45]. 

C. F. Ryan and R. J. Crochowski, Acrylic Modifiers which Impart Impact Resistance and Transparency to Vinyl Chloride Polymers, U.S. Pat. 3,426,101 (1969). Three-layered latex IPN Poly(butyl acrylate), network I. Polystyrene, network II. Poly(methyl methacrylate), linear polymer III. Latex dispersed in poly(vinyl chloride) or copolymers. 

Degalan V 26 (Degussa, A.G., B.R.D.). This is a 90/10 (methyl methacrylate)-(butyl acrylate) copolymer. It mixes well with PVC and it does not affect its transparency, water absorption, and electrical properties. It is suitable to modify the rheological properties of impact-PVC. It shortens the plastication time of PVC mixtures and it improves their homogenization and the extrusion output. The addition of Degalan V 26 also improves the heat stability of PVC mixtures and increases the resistance of PVC-based products to heat distortion. 

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