9003-27-4

Basic information

• Product Name: POLYISOBUTYLENE
• Synonyms: 1-Propene,2-methyl-,homopolymer;2-methyl-1-propenhomopolymer;2-methylpropenepolymer;2-methyl-propenpolymers;amoco600;hyvis200;kp5;maxvis2000
• CAS NO: 9003-27-4
• Molecular Weight: 56.10632
• EINECS: 204-066-3
• Product Categories: Polymers;Butene and Higher Organic Electronics and Photonics;Dielectric Materials;Hydrophobic Polymers;Olefins;Organic Conductors and Photovoltaics: OFET and OPV Materials;Butene and Higher;Poly(isobutylene);Alphabetic;Organic Soluble Polymers;P;POLB - POLYPolymer Standards;Butene and Higher;Dielectric Materials;Hydrophobic Polymers;Materials Science;Organic and Printed Electronics;Organic Field Effect Transistor (OFET) Materials;Polymer Science
• Mol File: 9003-27-4.mol
• Article Data: 3

Chemical Properties

• Melting Point: 54-56 °C
• Boiling Point: 300 °C
• Appearance: /slab/chunk
• Density: 0.92 g/mL at 25 °C(lit.)
• Refractive Index: n20/D 1.51
• Stability: Stability Combustible. Incompatible with strong oxidizing agents.
• CAS DataBase Reference: POLYISOBUTYLENE(CAS DataBase Reference)
• NIST Chemistry Reference: POLYISOBUTYLENE(9003-27-4)
• EPA Substance Registry System: POLYISOBUTYLENE(9003-27-4)

Safety Data

• Safety Statements: 24/25
• WGK Germany: 3
• RTECS: UD1010000
• Hazardous Substances Data: 9003-27-4(Hazardous Substances Data)

Usage

Chemical Properties

Different sources of media describe the Chemical Properties of 9003-27-4 differently. You can refer to the following data:
1. Polyisobutylene is composed of long-chain hydrocarbon formed by polymerization of isobutene, and is extremely stable under normal conditions. It is transparent non-noxious high-consistency semi-solid polymer free of impurities.
2. The physical properties of polyisobutene are very dependent on molecular weight. Polymers with average molecular weight (Mw) of about 15 000 are sticky viscous liquids whilst those with molecular weight of 100000-200000 are rubber-like, resembling unmilled crepe rubber. Polyisobutene is non-crystalline when unstretched and is therefore soluble at room temperature in hydrocarbons and halogenated hydrocarbons. The material is resistant to most acids, alkalis and aqueous solutions, as would be expected from its saturated hydrocarbon structure and absence of tertiary hydrogen atoms. The lack of tertiary hydrogen atoms renders polyisobutene more resistant to oxidation than polypropylene; also, the less numerous and partially shielded methylene groups in polyisobutene are less reactive than those in polyethylene. However, polyisobutene is rather susceptible to thermal degradation since chain scission is favoured by the greater stability of the resultant tertiary free radical:Polyisobutene may be chlorinated but the reaction is accompanied by severe degradation. A limitation of polyisobutene is its tendency to cold flow and, as a result, the polymer finds little use in self-supporting form. Applications are restricted mainly to adhesives, fabric and paper coatings, and blends with other polymers. Low molecular weight polyisobutene is also used in caulking compounds.

Uses

polyisobutene (hydrogenated) is an emollient.Polyisobutylene, sometimes called butyl rubber, and other times PIB, is a vinyl polymer. It's very similar to polyethylene and polypropylene in structure, except that every other carbon is substituted with two methyl groups. It is made from the monomer isobutylene, by cationic vinyl polymerization.Polyisobutylene is a synthetic rubber, or elastomer. It's special because it's the only rubber that's gas impermeable. That is, it's the only rubber that can hold air for long periods of time. You may have noticed that balloons will go flat after a few days. This is because they are made of polyisoprene, which is not gas impermeable. Because polyisobutylene will hold air, it is used to make things like the inner tubes, liner layers of tires, and the inner liners of basketballs.

Preparation

Silicone rubbers are prepared as follows: Other groups may replace the methyl groups. Silicone rubbers have excellent ozone and weathering resistance, good electrical properties, and good adhesion to metal.

Definition

ChEBI: A polymer composed of repeating 1,1-dimethylethylene units.

Synthetic route

isobutene (115-11-7) → polyisobutene

Conditions	Yield
With 1,4-bis(o-chloroisopropyl)benzene; triethoxyphenylsilane; titanium tetrachloride In hexane; dichloromethane; isopropyl alcohol at -78 - 20℃; for 2h;
With cumenyl chloride; titanium tetrachloride In hexane; dichloromethane at -78 - 50℃; for 0.583333h; Cooling with acetone-dry ice;
With pyridine; α,α,α',α'-tetramethyl-1,4-benzene dimethylchloride; titanium tetrachloride In hexane; dichloromethane at -68℃; for 2h;

isobutene (115-11-7) → polyisobutene

Conditions	Yield
With 1,4-bis(o-chloroisopropyl)benzene; triethoxyphenylsilane; titanium tetrachloride In hexane; dichloromethane; isopropyl alcohol at -78 - 20℃; for 2h;
With cumenyl chloride; titanium tetrachloride In hexane; dichloromethane at -78 - 50℃; for 0.583333h; Cooling with acetone-dry ice;
With pyridine; α,α,α',α'-tetramethyl-1,4-benzene dimethylchloride; titanium tetrachloride In hexane; dichloromethane at -68℃; for 2h;

polyisobutene + diphenylamine (122-39-4) → Mussel Adhesive Protein

Conditions	Yield
Engelhard F-24 at 135 - 170℃; under 760.051 Torr; for 1.5 - 24h;
Engelhard F-24 sulphuric acid activated catalyst at 165 - 200℃; under 2585.81 Torr; for 0.5 - 24h;

Upstream product

• 115-11-7 isobutene 

Relevant articles and documents

Use Of Polyisobutenyl Succinic Anhydride-Based Block Copolymers In Cosmetic Preparations

The invention relates to novel cosmetic preparations comprising an O/W emulsion, where the O/W emulsion comprises at least one amphiphilic polymer comprising one or more hydrophobic units A and one or more hydrophilic units B, where the hydrophobic units A are formed from polyisobutenes modified with terminal, polar groups, at least one component with an HLB value in the range from 8 to 20, and at least one oil and/or fat phase and water.

Method for producing polyisobutenes

Polyisobutenes in which at least 60 mol % of the polymer chains have at least one olefinically unsaturated terminal group are prepared by cationic polymerization of isobutene or isobutene-containing monomer mixtures in the condensed phase by a process in which the polymerization is carried out in the presence of an initiator system comprising i) a Lewis acid selected from covalent metal chlorides and semimetal chlorides and ii) at least one organic compound I having at least one functional group FG which forms a carbocation or a cationic complex with the Lewis acid under the polymerization conditions, where FG is selected from acyloxy, alkoxy and halogen, which are bonded to a secondary or tertiary carbon atom or to an allylic or a benzylic carbon atom, in a solvent inert toward the Lewis acid, the Lewis acid being used in less than the stoichiometric amount, based on the functional groups FG.