In paint and polymer terminology used in building finishes, “acrylic” refers to which base monomer/resin family most accurately? Select one correct identification.

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:

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