Disclosed is a fibrous nonwoven structure comprising meltblown fibrous materials and at least one secondary fibrous material and method of preparing. In one aspect, the fibrous nonwoven structure has a formation index of between 70 and 135. In another aspect, the fibrous nonwoven structure has an opacity...http://www.google.com.au/patents/US20090233072?utm_source=gb-gplus-sharePatent US20090233072 - FIBROUS NONWOVEN STRUCTURE HAVING IMPROVED PHYSICAL CHARACTERISTICS AND METHOD OF PREPARING
