2017年本产业受到进口产品的竞争排挤，加上国内下游食品包装用膜需求下滑，又本产业海外市场竞争压力仍大，故2017年我国塑料膜袋制造业销售值年增率小幅衰退达2.82%。2018年第一季由于国内扩大限塑范围，影响国内市场对购物用塑料袋需求下滑，又塑料膜袋市场所面临的同业产能竞争压力仍大，估计2018年第一季本产业销售值年增率将呈现持续衰退。

The styrene butadiene rubber market has been segmented based on three parameters, namely product, application, and region. Based on the product, the market has been segmented into ESBR and S-SBR. Based on the application, the market has been segmented into tire, footwear, polymer modification, adhesive, and others. Based on region, the market has been the market has been segmented into North America, Europe, Asia Pacific, and Rest of World.

Global plastics volume was estimated at 281,047.96 kilotons in 2016. Over the past, there has been considerable demand for plastics as replacement for metals and alloys across various industries such as automotive, industrial machinery and consumer goods. The industry’s criticality lies on technology, since ever-increasing requirement of end-user in terms of product specification and versatility gradually tend to overshadow consumption dynamics. Other factors such as feedstock availability, production process and socio-political events have a significant impact on industry trends.

The polyimide films market accounted for USD 1,149.3 million in 2016, and it is projected to gain higher market share over the forecast period. The market is projected to grow at a CAGR of 8.6% by revenue owing to the growing application scope of PI films. Development in aerospace, automotive, electronics, and labeling industry is augmenting the product demand.

综述了国内外乙丙橡胶的生产及市场情况，对市场发展趋势进行了分析及预测，并对国内乙丙橡胶行业发展提出了几点建议。

过去几年国内合成橡胶能力增速大幅减缓，需求回升，装置利用率不断提高。但进口量也在持续回升，供应过剩与大量进口之间的结构矛盾仍较突出。2017 年橡胶及原料价格大幅上涨，合成橡胶盈利能力略有好转。2018年汽车增长乏力拖累橡胶需求，供应快速增加，合成橡胶行业利润水平不及上年。从近年发展趋势看，东南亚已成为全球合成橡胶高端品种新的生产地区，中东、俄罗斯也在加快合成橡胶产能布局，中国未来合成橡胶生产成本有望大幅降低；从需求趋势看，合成橡胶正向高端化、定制化方向发展，同时热塑性弹性体对部分传统硫化橡胶的替代也成为发展趋势。