Cellulose ethers are a family of water-soluble polymers derived from cellulose, a natural polymer found in the cell walls of plants. The chemical structure of cellulose ethers is achieved through chemical modifications of cellulose by introducing various ether groups. The common cellulose ethers include Hydroxyethyl Cellulose (HEC), Hydroxypropyl Methylcellulose (HPMC), Methyl Cellulose (MC), Carboxymethyl Cellulose (CMC), and others. The chemical structures of these cellulose ethers are as follows:

1. Hydroxyethyl Cellulose (HEC):
   • Hydroxyethyl groups are introduced into the cellulose structure.
   • Chemical Structure: [Cellulose] – [O-CH2-CH2-OH]
2. Hydroxypropyl Methylcellulose (HPMC):
   • Hydroxypropyl and methyl groups are introduced into the cellulose structure.
   • Chemical Structure: [Cellulose] – [O-CH2-CHOH-CH3] and [O-CH3]
3. Methyl Cellulose (MC):
   • Methyl groups are introduced into the cellulose structure.
   • Chemical Structure: [Cellulose] – [O-CH3]
4. Carboxymethyl Cellulose (CMC):
   • Carboxymethyl groups are introduced into the cellulose structure.
   • Chemical Structure: [Cellulose] – [O-CH2-COOH]

The exact chemical structure can vary based on the degree of substitution (DS) and other factors related to the manufacturing process. The introduction of these ether groups imparts specific properties to each cellulose ether, such as water solubility, thickening ability, film-forming capability, and more.

Manufacturers of cellulose ethers include both global and regional companies. Some prominent manufacturers in the cellulose ethers industry include:

1. Kima Chemical:
   • Kima Chemical is a multinational cellulose ether chemical company that produces a variety of chemical products, including cellulose ethers.
2. Shin-Etsu:
   • Shin-Etsu, based in Japan, is known for manufacturing various chemical products, including cellulose derivatives.
3. Ashland Inc.:
   • Ashland is a global specialty chemicals company that produces cellulose ethers among other products.
4. CP Kelco:
   • CP Kelco is a leading global producer of specialty hydrocolloids, including cellulose ethers.
5. AkzoNobel:
   • AkzoNobel is a multinational company that manufactures a range of specialty chemicals, including cellulose ethers.
6. Nouryon (formerly AkzoNobel Specialty Chemicals):
   • Nouryon is a major producer of specialty chemicals, and it continues the legacy of AkzoNobel Specialty Chemicals.

These companies have a significant presence in the cellulose ethers market and provide a range of grades and variations to meet diverse industrial and commercial needs. When using cellulose ethers, it is crucial to refer to the specific product documentation provided by the manufacturer for detailed information on properties, recommended usage levels, and other technical details.