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CTBN (Carboxy-Terminated Nitrile Butadiene Rubber(CTBN) CAS No. 25265-19-4 )
Carboxyl-terminated butadiene-acrylonitrile
CTBN
CAS No. 25265-19-4
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Carboxy-Terminated Liquid Polybutadiene(CTPB) CAS No. 586976-24-1 CTPB
Carboxy-Terminated Liquid Polybutadiene
CTPB
CAS No. 586976-24-1
Chemical Name: Carboxy-Terminated Liquid Polybutadiene
Code: CTPB
CAS No.: 586976-24-1
HS CODE: 3902 9000.30
Product Description
CTPB(Carboxy-Terminated Liquid Polybutadiene) is a liquid telechelic polybutadiene with reactive carboxyl groups (–COOH) at both chain ends.
Structure：High cis-1,4 polybutadiene backbone with reactive terminal carboxyl groups. It readily reacts with epoxy groups, isocyanates and amine curing agents to crosslink into a 3D network structure.
Product properties & Features
Excellent cold resistance：Tg is approximately -78°C, maintaining good elasticity at low temperatures
Outstanding electrical insulation：The non-polar structure provides excellent dielectric properties
Good water resistance：Good hydrophobicity and low water absorption
High reactivity：Terminal carboxyl groups can undergo crosslinking reactions with epoxy groups, aziridines, isocyanates, etc.
Low viscosity & good compatibility：Easy to blend with epoxy/polyurethane; excellent filler dispersion
Regular network structure：Due to the functional groups being located at the chain ends, a regular three-dimensional network is formed after crosslinking, with no free chain ends, resulting in excellent mechanical properties
CTPB VS HTPB VS CTBN (Key Differences)
Comparison Item | CTPB | ||
End Group | Carboxyl (-COOH) | Hydroxyl (-OH) | Carboxyl (-COOH) |
Main Chain Structure | Polybutadiene (pure hydrocarbon) | Polybutadiene (pure hydrocarbon) | Butadiene-acrylonitrile copolymer |
Polarity | Non-polar | Non-polar | Polar (contains nitrile groups) |
Glass Transition Temperature Tg | ~ -78°C | ~ -80°C ~ -70°C | ~ -50°C ~ -30°C |
Primary Curing Method | Epoxides, aziridines, isocyanates | Isocyanates (e.g., DDI,TDI, IPDI) | Epoxy resins, isocyanates |
Main Advantage | Good cold resistance, regular network structure, excellent electrical insulation | Low viscosity, good processability, excellent overall performance, low cost | Excellent oil resistance, good epoxy compatibility, mature toughening |
Typical Applications | Solid propellants, low-temperature seals | Solid propellants (most mainstream), polyurethane elastomers | Epoxy toughening, oil-resistant adhesives |
Applications
(1) Epoxy Toughening
Function：High-efficiency toughener for epoxy systems (cost-effective alternative to CTBN with better low-temperature performance); typical loading: 10–25 phr.
Effects：Significantly improves low-temperature impact strength, peel strength, fracture toughness; lowers curing temperature; enhances moisture/aging resistance.
Applications：Aerospace structural adhesives, wind turbine blade adhesives, EV battery sealants, electronic encapsulants.
(2) Solid Rocket Propellants
Used as binder matrix; crosslinks with isocyanate curing agents to form highly elastic, high-strength propellant grains.
Features：Superior low-temperature flexibility, excellent mechanical properties, stable burn rate, long shelf life; for solid rocket motors, gas generators.
(3) Polyurethane (PU) Elastomers & Seals
Reacts with MDI/TDI to produce low-temperature resistant, high-elasticity PU elastomers, seals, O-rings, hoses.
Advantages over conventional PU：Serviceable down to –60°C, abrasion-resistant, hydrolysis-resistant, strong adhesion; for automotive chassis seals, hydraulic oil seals.
(4) High-End Sealants & Adhesives
Industrial Sealing：Construction waterproof sealants, heavy-duty machinery sealants, marine bilge sealants (salt spray & aging resistance).
Metal Bonding：Structural adhesives (aluminum/steel/composite bonding); room-temperature cure, high strength, impact-resistant.
(5) Electrical/Electronic Insulation & Encapsulation
Formulates insulating potting compounds, sensor sealants, high-voltage coatings; moisture-proof, shock-resistant, wide temperature range (–60°C to 120°C); volume resistivity ≥ 10¹³ Ω·m.
(6) Rubber Modification & Coatings
Acts as a reactive plasticizer to modify nitrile, neoprene, and butyl rubbers; improves processability and low-temperature elasticity; suppresses migration.
Used in anti-corrosion & weather-resistant coatings; enhances film flexibility, adhesion, and impact resistance.
Packing & Storage
50kg/plastic drum or 180kg/metal drum packaging.
The shelf life is 12 months, after the expiration of the re-inspection can still be used.
Avoid rain and sun during transportation. Do not mix with strong oxidants.
Technical Index
| Item | CTPB-1 | CTPB-2 |
| Carboxyl value,mmol/g | 0.40~0.47 | 0.68~0.75 |
| Water content,% | <0.05 | <0.05 |
| Viscosity (40℃), Pa.s | ≤15 | ≤12 |
| Functionality | 1.75-1.95 | 1.90-2.10 |
| Molecular weight | 4100-4500 | 2800-3400 |
*NOTE: We can customize CTPB according to customers' application and technical requirements.
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