Butyl methacrylate
Description
A clear, colorless liquid used for the production of resin acrylic resins. As early as the 1930s, solutions of polyisobutyl methacrylate (then Lucite 45, now Elvacite 2045) and poly n-butyl methacrylate (then Lucite 44, now Elvacite 2044) were used as picture varnishes (Epley 1998). By the 1960s, the resins fell into disuse because tests indicated they can crosslink. In the mid 1980s, Golden Artist colors introduced MSA varnish Golden MSA varnishes a proprietary mixture of isobutyl and n-butyl methacrylate polymers in a mineral spirits/Stoddard solvent type mixture. Polybutyl methacrylate was also used to make Plastic colors Magna Plastic paints from 1949 to the mid-1970s. A similar formulation is now made and sold as MSA colors.
See also methacrylate polymethyl methacrylate.
Synonyms and Related Terms
poly (n-butylmethacrylate); pnBMA; polibutilmetacrilato (Esp.); poli (n-butilmetacrilato) (Esp.); butyl-mhacrylate (Fr.); poli butil methacrilato (It.); polibutilmetacrilato (Port.); methacrylic acid; butyl ester
Examples: Lucite 44; Elvacite 2044
Other Properties
Insoluble in water.
Tg = 22 C
| Composition | H3C:CCH3COOC4H9 |
|---|---|
| CAS | 97-88-1 |
| Melting Point | -75 |
| Density | 0.895 |
| Molecular Weight | mol. wt. = 142.097 |
| Refractive Index | 1.4220 |
| Boiling Point | 163-164 |
Hazards and Safety
Combustible. Flash point = 41 C Moderate fire risk.
Lachrymator. Toxic by ingestion. Contact causes irritation.
Potential teratogen.
Crosslinks under strong fluorescent light exposure.
Fisher Scientific: MSDS
Additional Information
B. Epley, "The History of Synthetic Resin Varnishes", AIC Painting Conservation Catalog: Varnishes and Surface Coatings, p.39, 1998.
Comparisons
Physical Properties for Selected Thermoplastic Resins
General Characteristics of Polymers
Authority
- Paintings Specialty Group, Paintings Specialty Group, Painting Conservation Catalog, Wendy Samet (ed.), AIC, Washington, DC, 1998