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LPB (Liquid Polybutadiene )
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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 polybutadiene rubber with carboxyl (–COOH) groups at both ends of the molecular chain, belonging to the family of end-functionalized specialty liquid rubbers.
CAS No.：68891-79-2
Appearance：Pale yellow to brownish-yellow viscous liquid
Molecular weight：2,800–4,500 (Mn)
Viscosity (40°C)：≤15 Pa·s (lower than CTBN, better processability)
Structure：Polybutadiene backbone (high cis-1,4 content) with reactive carboxyl end groups; reacts readily with epoxies, isocyanates, and amine curing agents.
Product properties & Features
Excellent low-temperature flexibility：Tg = –80°C ~ –100°C (far superior to CTBN/HTBN)
High reactivity：Carboxyl groups react directly with epoxy/isocyanate (no catalyst needed)
Good water resistance, weatherability & dielectric properties：Suitable for humid/outdoor environments
Low viscosity & good compatibility：Easy to blend with epoxy/polyurethane; excellent filler dispersion
CTPB vs HTPB vs CTBN vs HTBN (Key Differences)
| Abbreviation | Terminal Group | Main Chain | Most Outstanding Property | Biggest Shortcoming | Core Application |
|---|---|---|---|---|---|
| CTPB | –COOH | Polybutadiene | Best low-temperature resistance (-80~-100°C), lowest viscosity | Poor oil resistance | Low-temperature epoxy toughening, cold-resistant sealants |
| HTPB | –OH | Polybutadiene | Excellent low-temperature resistance, hydrolysis resistance, highest PU reactivity | Poor oil resistance | Solid rocket propellants, PU elastomers |
| CTBN | –COOH | Butadiene-acrylonitrile (nitrile-containing) | No.1 oil resistance, strongest epoxy toughening, high adhesion | High viscosity, expensive | Oil-resistant structural adhesives, aerospace epoxy systems |
| HTBN | –OH | Butadiene-acrylonitrile (nitrile-containing) | Good oil resistance, PU-compatible, good processability | Average low-temperature resistance | Oil-resistant PU seals, O-rings, hoses |
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.
Storage should be cool, dry and ventilated.
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 research and develop new version of CTPB according to the special demand of our clients.
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