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The expression "acrylic polymers" covers polymers of acrylic or methacrylic acid, of their salts or esters, or of the corresponding aldehydes, amides or nitriles.
Poly(methyl methacrylate) is the most important polymer of this category. It is used, because of its excellent optical properties and its physical strength, as a glazing material, in outdoor signs and other display articles, and in the manufacture of artificial eyes, contact lenses and artificial dentures.
Polymers of acrylonitrile may be used in the manufacture of synthetic fibres.
For the classification of polymers (including copolymers), chemically modified polymers and polymer blends, see the General Explanatory Note to this Chapter.
This heading excludes :(a) Acrylic polymers which are ion‑exchangers (heading 39.14). (b) Copolymers of acrylonitrile which comply with the requirements of Note 4 to Chapter 40 (Chapter 40).
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