9004-36-8

Basic information

• Product Name: CELLULOSE ACETATE BUTYRATE
• Synonyms: cellaburate;Cellulose,acetatebutanoate;CELLULOSE ACETATE BUTYRATE;CELLULOSE ACETATE BUTYRATE POLYMER;CELLULOSE ACETOBUTYRATE;CELLULOSE ACETATE BUTYRATE, 38 WT. % BUT YRYL CONTENT, AVERAGE MN CA. 30,000;CELLULOSE ACETATE BUTYRATE, 52 WT. % BUT YRYL CONTENT, AVERAGE MN CA. 30,000;CELLULOSE ACETATE BUTYRATE, 31 WT. % BUT YRYL CONTENT, AVERAGE MN CA. 12,000
• CAS NO: 9004-36-8
• Molecular Weight: 0
• EINECS: 618-381-2
• Product Categories: Cellulose;Natural Polymers;Polymer Science;Materials Science;Natural Polymers;Polymer Science;Polymers
• Mol File: 9004-36-8.mol
• Article Data: 0

Chemical Properties

• Melting Point: 127-240 °C
• Appearance: White/Granular Crystalline Powder
• Density: 1.25 g/mL at 25 °C(lit.)
• Refractive Index: n20/D 1.475(lit.)
• Storage Temp.: 2-8°C
• Solubility: Practically insoluble in water, soluble in acetone, in formic acid and in a mixture of equal volumes of methanol and methylene chloride, practically insoluble in ethanol (96 per cent).
• CAS DataBase Reference: CELLULOSE ACETATE BUTYRATE(CAS DataBase Reference)
• NIST Chemistry Reference: CELLULOSE ACETATE BUTYRATE(9004-36-8)
• EPA Substance Registry System: CELLULOSE ACETATE BUTYRATE(9004-36-8)

Safety Data

• Safety Statements: 22-24/25
• Hazardous Substances Data: 9004-36-8(Hazardous Substances Data)

Usage

Uses

Different sources of media describe the Uses of 9004-36-8 differently. You can refer to the following data:
1. Contact lens material (hydrophobic). Cellulose acetate butyrate is the most commonly used organic cel- lulose ester for coating applications.
2. Generally, an increase in butyryl content increases flexibility, moisture resistance, solubility and compatibility with resins; as the butyryl content increases, hardness, tensile strength and heat resistance decrease. Cellulose acetate-butyrate injection mouldings are particularly tough and are used for such applications as tabulator keys and tool handles; film is employed as a puncture-resistant packaging material. Cellulose acetate-butyrate is also used in lacquers for such items as cables, fabrics and furniture and in melt and strip coatings.

Preparation

Cellulose acetate-butyrate (CAB) is prepared in a manner similar to that described previously for cellulose acetate. Esterification is carried out using a mixture of acetic anhydride and butyric anhydride with sulphuric acid as catalyst and then the product is slightly hydrolysed. Depending on the reaction conditions, various products may be obtained; commercial materials generally have about 1-2 butyryl groups per glucose residue.

Industrial uses

Commonly called butyrate or CAB, it is somewhattougher and has lower moisture absorptionand a higher softening point than acetate.CAB is made by the esterification of cellulosewith acetic acid and butyric acid in the presenseof a catalyst. It is particularly valuedfor coatings, insulating types, varnishes, andlacquers.Special formulations with good weatheringcharacteristics plus transparency are used foroutdoor applications such as signs, light globes,and lawn sprinklers. Clear sheets of butyrateare available for vacuum-forming applications.Other typical uses include transparent dial covers,television screen shields, tool handles, andtypewriter keys. Extruded pipe is used for electricconduits, pneumatic tubing, and low-pressurewaste lines. Cellulose acetate butyrate alsois used for cable coverings and coatings. It ismore soluble than cellulose acetate and moremiscible with gums. It forms durable and flexiblefilms. A liquid cellulose acetate butyrate isused for glossy lacquers, chemical-resistantfabric coatings, and wire-screen windows. Ittransmits ultraviolet light without yellowing orhazing and is weather-resistant.