In paint and polymer terminology used in building finishes, “acrylic” refers to which base monomer/resin family most accurately? Select one correct identification.
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Acellulose resin
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Balkyd resin
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Cmethyl methacrylate
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Dcumarone–indene resin
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Ephenolic resin
Answer
Correct Answer: methyl methacrylate
Explanation
Introduction / Context:Acrylic coatings and polymers are widespread in architectural paints, sealants, and plastics. Knowing the chemical basis behind “acrylic” helps practitioners predict weathering resistance, UV stability, and film properties for exterior/interior work.
Given Data / Assumptions:
- “Acrylic” in finishes typically denotes polymers based on acrylic or methacrylic esters.
- Common monomer: methyl methacrylate (MMA), among others.
Concept / Approach:
Acrylic polymers are produced from monomers like methyl methacrylate (MMA), ethyl acrylate, and butyl acrylate. In coatings, “100% acrylic” latexes emphasize methacrylate/acrylate content for superior exterior durability compared to vinyl–acrylics. Alkyds are polyester resins modified with fatty acids; cellulose resins and cumarone–indene or phenolics represent entirely different chemistry and properties.
Step-by-Step Solution:
1) Map the term “acrylic” to methacrylate/acrylate chemistry.2) Identify the flagship monomer: methyl methacrylate.3) Exclude alkyd, cellulose, phenolic, and cumarone–indene families.Verification / Alternative check:
Paint datasheets and polymer texts consistently list MMA-based copolymers as the backbone of high-performance acrylic coatings.
Why Other Options Are Wrong:
Cellulose resin: film-formers but not acrylics. Alkyd: oil-modified polyesters. Cumarone–indene and phenolic: specialty resins not classed as acrylics.
Common Pitfalls:
Equating “acrylic” with any water-based paint; binder chemistry, not solvent, defines the class.
Final Answer:
methyl methacrylate