Oxazoline Group-Containing Reactive Polystyrene: EPOCROS™ RPS Oxazoline group-containing reactive polystyrene

Basic Information

Epocros RPS-1005 is an amorphia type reactive polymer which has oxazoline groups as its pendant. By utilizing the characteristics of oxazoline groups as polar functional groups and high reactivity they have with carboxyl groups, Epocros is expected to have wide variety of application fields in thermoplastic area as compatibilizer and dispersing agent.

Illustration of Epocros RPS-1005

Features and Properties

  • Oxazoline groups have high reactivity with carboxyl groups. Being melted and kneaded with
    melt polymers with carboxyl groups, they can quickly generate graft polymers.
  • It has highly stable viscosity when melted and kneaded under high temperature.
  • Customers can utilize polarity and ionic interaction arisen from oxazoline groups.
EPOCROS™ RPS-1005PX3-RP-61 (in development)
AppearanceWhite granulated powder
Main ChainPolystyrene
Molecular Weight (Mw/GPC)Approx. 160,000Approx. 25,000
Oxazoline Group Concentration
(mmol/-solid, calculated value)
Glass Transition Temperature (°C)*1100100
Decomposition Temperature
5% loss, under air
Melt Flow Rate*2 (g/10 min)6-10
Compatible Polymers
(Matrix(Polymer A))
PPS, PPE, HIPS, PS, etc.
Styrenic polymer
Reactable Polymers
(Domains (Polymer B))
• Carboxyl Groups: PET, PBT, PLA, PA, Acid-modified PP, etc.
• Phenolic Hydroxyl Group: PC, etc.
• Aromatic SH Group: PPS, etc.
*1: Calculated value
*2: 200°C, 5 kg load (ASTM D1238)

Details of Functions

EPOCROS™ RPS is a compatibilizer which the main chain is Polystyrene with Oxazoline as the side chain.

It can be compatible with the styrenic polymer such like PPS, PPE, HIPS, PS, and so on. Also Oxazoline can be reacted with the functional group such like carboxyl groups, phenolic hydroxyl groups, aromatic thiol groups such like PET, PBT, PLA, PA, acid-modified PP, PC, PPS and so on.

As the result, EPOCROS™ RPS can be compatible with the resins which are not compatible with Polystyrene and have carboxyl groups, phenolic hydroxyl groups, aromatic thiol groups as functional group.

Examples of Use

  • Compatibilizer
    By utilizing the reactivity of the oxazoline groups, Epocros can realize micro dispersion of dispersing phase as well as improving physical characteristics of moldings (especially improvement on impact strength)
  • Auxiliary agent for dispersing
    Epocros can improve the dispersing status of pigments, fire retardants and bulking agents which are added into thermoplastic resins.
  • Acid trapping agent
    Epocros can improve heat stability of the moldings by trapping free acids generated in thermoplastic resins.
  • Polymer chain extending agent
    Epocros can improve viscosity of melting resins by introducing brunch structure using oxazoline groups as the reactive sites.
  • Extruded laminated body
    Laminated structure and laminated films can be generated without inserting adhesive layers between each layer by utilizing the reactivity between oxazoline groups and carboxyl groups contained in thermoplastic resins (ex. PET and / or Acid altered polyolefin)
  • Dielectric constant reducer
    The oxazoline group is used as a reaction point, and the dielectric constant is lowered by introducing a styrene unit.

Related Products

Heat-resistance improver, Compatibilizer