Many 
asbestos manufactures and other companies that used asbestos in  their products have known about the dangers associated with asbestos  exposure since the early part of the twentieth century. Nonetheless,  because of its unique properties, the demand for products that  incorporated asbestos continued to grow for many years. And these  companies continued to do whatever they could to satisfy that demand.
Demand for asbestos peaked between World War II and the Korean War.
By  then millions of 
asbestos workers had been exposed to asbestos fibers.  And countless millions of people who were not in the industry were  exposed to the substance in their offices, 
schools, homes, and 
automobiles.
Asbestos  companies and insurance companies were well aware of the dangers  associated with asbestos inhalation for many years. Yet they chose to  hide the evidence and deny any wrong doing on their part. Instead, these  companies chose to put their workers health at risk in their pursuit of  profit.
Things changed dramatically in 1971 when a Federal court  reviewed a product liability case and issued the first verdict against  an asbestos manufacturer. The court also decided to award the employee  who filed the complaint damages. ubsequently the ruling was appealed. However, the verdict was upheld. This seemed to open a floodgate to asbestos litigation. Even in the face of this decision asbestos companies chose to fight back.
Instead  of acknowledging all of the detrimental effects exposure to 
asbestos  had wreaked on their workers lives, manufactures instead decided to  defend against the rising flood of complaints. Instead of doing things  that could protect their workers, things that could help to alleviate  the dangers their employees faced at work every day, the manufacturers  "battened down the hatches", denied responsibility, and "dug in".
The  courts continued to rule against asbestos manufacturers and continued  to award payments to the workers who were losing their health, their  livelihood, and their lives. With ever increasing award payments  and legal bills, asbestos companies searched for a different approach.  Bankruptcy seemed to be a solution.UNARCO and Johns Manville were  the first asbestos companies to file for Chapter 11 bankruptcy  protection in 1982. Since that time in excess of eighty companies have  filed for bankruptcy.
Companies that declare bankruptcy seemingly  as an attempt to reorganize their finances and buy some time. Ostensibly  this is so they can pay the liability claims for asbestos that the  courts have awarded. When a company files for Chapter 11  protection, the filing will suspend any future or pending lawsuits  against that company for the duration of the bankruptcy case. The  company essentially asks the court to authorize a plan that will include  the establishment of a settlement 
trust fund.
The company's strategy will redirect on any future claims that are filed against company to the trust.The asbestos bankruptcy 
trust funds  that have been established operate under rules that make sure that the  funds within them are available for claims in the future. Over $30  billion has been made available within these trusts.
This can  actually benefit people who have suffered from an asbestos related  disease but who have missed the time frame within which they should have  filed a lawsuit. That's because even if the statute of limitations has  passed for filing a claim against a company the window still could be  open for filing a lawsuit against the trust.
Source : 
asbestos wiki