Fibre reinforced thermoplastic laminates - contg. inner layer(s) of glass mat and a polystyrene-diene block copolymer

摘要

Laminates comprise >=3 layers A, B and C, such that A and C consist of similar or different thermoplastics, and the middle layer B consists of a fibre-reinforced thermoplastic and the layers are strongly bonded together. The layer B consists of a block copolymer of formula (X-Y)n or X-(Y-X)n where X=polystyrene, Y=a diene polymer and n=1, 2 or 3, in which the fibrous reinforcement is embedded. Used for screens, wall elements, decorative panels, etc. and mouldings. Laminates of thermoplastics with glass mat interlayers are known but adhesion is poor unless the glass is specially treated. Rigid materials such as impact resistant polystyrene lose their toughness and soft prods. Such as polyethylene are not sufficiently rigid. These disadvantages are avoided if the glass fibres are embedded in a rubbery, elastic but easy flowing and mouldable thermoplast. Such prods. adhere well to both glass fibres (without pretreatment) and impact resistant polystyrene. A laminate with outer layers of polystyrene and polyethylene comprised alternate inner layers of glass mat and a styrene-butadiene block copolymer contg. 40 wt. % styrene.