* Weak markets due to trade spat may weigh on sentiment -bankers. : HONG KONG (Reuters) - Chinese tech titans preparing to float in Hong Kong and New York are likely to face a bumpy ride if trade tensions between the world’s two biggest economies persist, potentially dragging on capital raisings after a stellar first half. While so far there has not been any significant impact from the U.S.-China trade spat, with funds raised in Asia-Pacific equity capital markets (ECM) at a three-year high and blockbuster listings such as Xiaomi still on track, there are indications smaller deals are getting hurt.