Benzoxazine Resins

1. INTRODUCTION

Benzoxazineresins are prepared from the reaction of 1:1:2 (molar ratio) of amine, phenoland formaldehyde. When heated, they homopolymerize readily to form rigidpolymers that can be widely used as high-temperature composites, highperformance copper clad laminates andplastic packaging materials. Improved properties can be obtained by conbiningwith epoxy or phenolic resins, catalysts or toughening agents.

Benzoxazine resins and corresponding polybenzoxazines possess excellent performances.

• Room temperature storage and shipping stability

• No volatile release during cure

• Low cure shrinkage and exotherm

• Good dimensional stability

• Low water absorptivity

• Low dielectric constant

• Excellent flame resistance

• High temperature resistance

• Good mechanical property

• Good chemical resistance

Based on these advantages, the halogen-free benzoxazines are widely applied as composites, coatings, adhesives and encapsulants in a wide range of demanding applications. A simple comparison between benzoxazine resin and other classical resins is shown as follows.

Benzoxazine resin vs. epoxy:

› Higher retention of hot/wet properties

› Lower cure shrinkage and heat release

› Better flame resistance and inherent Flame-Smoke-Toxicity (FST) characteristic

Benzoxazine resion vs. phenolics:

› Lower porosity

› No external acid or base catalysts needed for curing

› Better mechanical properties

Benzoxazine resin vs. BMI:

› Lower cure temperature and shorter curing time

› Lower cost

› Higher toughness

ACO PHARM CO.,LTD. has developed a series of benzoxazine resins (benzoxazine) and the corresponding formulations, which can meet the various requirements of different application scenarios. The following superiorities of benzoxazines are suggested to be considered when making a choice.

* Reactivity and stability of the resin

* Heat resistance

* Toughness and damage tolerance

* Processing method